Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/mm/page_alloc.c | |
3 | * | |
4 | * Manages the free list, the system allocates free pages here. | |
5 | * Note that kmalloc() lives in slab.c | |
6 | * | |
7 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
8 | * Swap reorganised 29.12.95, Stephen Tweedie | |
9 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 | |
10 | * Reshaped it to be a zoned allocator, Ingo Molnar, Red Hat, 1999 | |
11 | * Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999 | |
12 | * Zone balancing, Kanoj Sarcar, SGI, Jan 2000 | |
13 | * Per cpu hot/cold page lists, bulk allocation, Martin J. Bligh, Sept 2002 | |
14 | * (lots of bits borrowed from Ingo Molnar & Andrew Morton) | |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/stddef.h> |
18 | #include <linux/mm.h> | |
19 | #include <linux/swap.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/pagemap.h> | |
10ed273f | 22 | #include <linux/jiffies.h> |
1da177e4 LT |
23 | #include <linux/bootmem.h> |
24 | #include <linux/compiler.h> | |
9f158333 | 25 | #include <linux/kernel.h> |
b1eeab67 | 26 | #include <linux/kmemcheck.h> |
1da177e4 LT |
27 | #include <linux/module.h> |
28 | #include <linux/suspend.h> | |
29 | #include <linux/pagevec.h> | |
30 | #include <linux/blkdev.h> | |
31 | #include <linux/slab.h> | |
5a3135c2 | 32 | #include <linux/oom.h> |
1da177e4 LT |
33 | #include <linux/notifier.h> |
34 | #include <linux/topology.h> | |
35 | #include <linux/sysctl.h> | |
36 | #include <linux/cpu.h> | |
37 | #include <linux/cpuset.h> | |
bdc8cb98 | 38 | #include <linux/memory_hotplug.h> |
1da177e4 LT |
39 | #include <linux/nodemask.h> |
40 | #include <linux/vmalloc.h> | |
4be38e35 | 41 | #include <linux/mempolicy.h> |
6811378e | 42 | #include <linux/stop_machine.h> |
c713216d MG |
43 | #include <linux/sort.h> |
44 | #include <linux/pfn.h> | |
3fcfab16 | 45 | #include <linux/backing-dev.h> |
933e312e | 46 | #include <linux/fault-inject.h> |
a5d76b54 | 47 | #include <linux/page-isolation.h> |
52d4b9ac | 48 | #include <linux/page_cgroup.h> |
3ac7fe5a | 49 | #include <linux/debugobjects.h> |
dbb1f81c | 50 | #include <linux/kmemleak.h> |
925cc71e | 51 | #include <linux/memory.h> |
56de7263 | 52 | #include <linux/compaction.h> |
0d3d062a | 53 | #include <trace/events/kmem.h> |
718a3821 | 54 | #include <linux/ftrace_event.h> |
1da177e4 LT |
55 | |
56 | #include <asm/tlbflush.h> | |
ac924c60 | 57 | #include <asm/div64.h> |
1da177e4 LT |
58 | #include "internal.h" |
59 | ||
72812019 LS |
60 | #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID |
61 | DEFINE_PER_CPU(int, numa_node); | |
62 | EXPORT_PER_CPU_SYMBOL(numa_node); | |
63 | #endif | |
64 | ||
7aac7898 LS |
65 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
66 | /* | |
67 | * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly. | |
68 | * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined. | |
69 | * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem() | |
70 | * defined in <linux/topology.h>. | |
71 | */ | |
72 | DEFINE_PER_CPU(int, _numa_mem_); /* Kernel "local memory" node */ | |
73 | EXPORT_PER_CPU_SYMBOL(_numa_mem_); | |
74 | #endif | |
75 | ||
1da177e4 | 76 | /* |
13808910 | 77 | * Array of node states. |
1da177e4 | 78 | */ |
13808910 CL |
79 | nodemask_t node_states[NR_NODE_STATES] __read_mostly = { |
80 | [N_POSSIBLE] = NODE_MASK_ALL, | |
81 | [N_ONLINE] = { { [0] = 1UL } }, | |
82 | #ifndef CONFIG_NUMA | |
83 | [N_NORMAL_MEMORY] = { { [0] = 1UL } }, | |
84 | #ifdef CONFIG_HIGHMEM | |
85 | [N_HIGH_MEMORY] = { { [0] = 1UL } }, | |
86 | #endif | |
87 | [N_CPU] = { { [0] = 1UL } }, | |
88 | #endif /* NUMA */ | |
89 | }; | |
90 | EXPORT_SYMBOL(node_states); | |
91 | ||
6c231b7b | 92 | unsigned long totalram_pages __read_mostly; |
cb45b0e9 | 93 | unsigned long totalreserve_pages __read_mostly; |
8ad4b1fb | 94 | int percpu_pagelist_fraction; |
dcce284a | 95 | gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK; |
1da177e4 | 96 | |
452aa699 RW |
97 | #ifdef CONFIG_PM_SLEEP |
98 | /* | |
99 | * The following functions are used by the suspend/hibernate code to temporarily | |
100 | * change gfp_allowed_mask in order to avoid using I/O during memory allocations | |
101 | * while devices are suspended. To avoid races with the suspend/hibernate code, | |
102 | * they should always be called with pm_mutex held (gfp_allowed_mask also should | |
103 | * only be modified with pm_mutex held, unless the suspend/hibernate code is | |
104 | * guaranteed not to run in parallel with that modification). | |
105 | */ | |
106 | void set_gfp_allowed_mask(gfp_t mask) | |
107 | { | |
108 | WARN_ON(!mutex_is_locked(&pm_mutex)); | |
109 | gfp_allowed_mask = mask; | |
110 | } | |
111 | ||
112 | gfp_t clear_gfp_allowed_mask(gfp_t mask) | |
113 | { | |
114 | gfp_t ret = gfp_allowed_mask; | |
115 | ||
116 | WARN_ON(!mutex_is_locked(&pm_mutex)); | |
117 | gfp_allowed_mask &= ~mask; | |
118 | return ret; | |
119 | } | |
120 | #endif /* CONFIG_PM_SLEEP */ | |
121 | ||
d9c23400 MG |
122 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
123 | int pageblock_order __read_mostly; | |
124 | #endif | |
125 | ||
d98c7a09 | 126 | static void __free_pages_ok(struct page *page, unsigned int order); |
a226f6c8 | 127 | |
1da177e4 LT |
128 | /* |
129 | * results with 256, 32 in the lowmem_reserve sysctl: | |
130 | * 1G machine -> (16M dma, 800M-16M normal, 1G-800M high) | |
131 | * 1G machine -> (16M dma, 784M normal, 224M high) | |
132 | * NORMAL allocation will leave 784M/256 of ram reserved in the ZONE_DMA | |
133 | * HIGHMEM allocation will leave 224M/32 of ram reserved in ZONE_NORMAL | |
134 | * HIGHMEM allocation will (224M+784M)/256 of ram reserved in ZONE_DMA | |
a2f1b424 AK |
135 | * |
136 | * TBD: should special case ZONE_DMA32 machines here - in those we normally | |
137 | * don't need any ZONE_NORMAL reservation | |
1da177e4 | 138 | */ |
2f1b6248 | 139 | int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = { |
4b51d669 | 140 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 141 | 256, |
4b51d669 | 142 | #endif |
fb0e7942 | 143 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 144 | 256, |
fb0e7942 | 145 | #endif |
e53ef38d | 146 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 147 | 32, |
e53ef38d | 148 | #endif |
2a1e274a | 149 | 32, |
2f1b6248 | 150 | }; |
1da177e4 LT |
151 | |
152 | EXPORT_SYMBOL(totalram_pages); | |
1da177e4 | 153 | |
15ad7cdc | 154 | static char * const zone_names[MAX_NR_ZONES] = { |
4b51d669 | 155 | #ifdef CONFIG_ZONE_DMA |
2f1b6248 | 156 | "DMA", |
4b51d669 | 157 | #endif |
fb0e7942 | 158 | #ifdef CONFIG_ZONE_DMA32 |
2f1b6248 | 159 | "DMA32", |
fb0e7942 | 160 | #endif |
2f1b6248 | 161 | "Normal", |
e53ef38d | 162 | #ifdef CONFIG_HIGHMEM |
2a1e274a | 163 | "HighMem", |
e53ef38d | 164 | #endif |
2a1e274a | 165 | "Movable", |
2f1b6248 CL |
166 | }; |
167 | ||
1da177e4 LT |
168 | int min_free_kbytes = 1024; |
169 | ||
2c85f51d JB |
170 | static unsigned long __meminitdata nr_kernel_pages; |
171 | static unsigned long __meminitdata nr_all_pages; | |
a3142c8e | 172 | static unsigned long __meminitdata dma_reserve; |
1da177e4 | 173 | |
c713216d MG |
174 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
175 | /* | |
183ff22b | 176 | * MAX_ACTIVE_REGIONS determines the maximum number of distinct |
c713216d MG |
177 | * ranges of memory (RAM) that may be registered with add_active_range(). |
178 | * Ranges passed to add_active_range() will be merged if possible | |
179 | * so the number of times add_active_range() can be called is | |
180 | * related to the number of nodes and the number of holes | |
181 | */ | |
182 | #ifdef CONFIG_MAX_ACTIVE_REGIONS | |
183 | /* Allow an architecture to set MAX_ACTIVE_REGIONS to save memory */ | |
184 | #define MAX_ACTIVE_REGIONS CONFIG_MAX_ACTIVE_REGIONS | |
185 | #else | |
186 | #if MAX_NUMNODES >= 32 | |
187 | /* If there can be many nodes, allow up to 50 holes per node */ | |
188 | #define MAX_ACTIVE_REGIONS (MAX_NUMNODES*50) | |
189 | #else | |
190 | /* By default, allow up to 256 distinct regions */ | |
191 | #define MAX_ACTIVE_REGIONS 256 | |
192 | #endif | |
193 | #endif | |
194 | ||
98011f56 JB |
195 | static struct node_active_region __meminitdata early_node_map[MAX_ACTIVE_REGIONS]; |
196 | static int __meminitdata nr_nodemap_entries; | |
197 | static unsigned long __meminitdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES]; | |
198 | static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES]; | |
b69a7288 | 199 | static unsigned long __initdata required_kernelcore; |
484f51f8 | 200 | static unsigned long __initdata required_movablecore; |
b69a7288 | 201 | static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES]; |
2a1e274a MG |
202 | |
203 | /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ | |
204 | int movable_zone; | |
205 | EXPORT_SYMBOL(movable_zone); | |
c713216d MG |
206 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ |
207 | ||
418508c1 MS |
208 | #if MAX_NUMNODES > 1 |
209 | int nr_node_ids __read_mostly = MAX_NUMNODES; | |
62bc62a8 | 210 | int nr_online_nodes __read_mostly = 1; |
418508c1 | 211 | EXPORT_SYMBOL(nr_node_ids); |
62bc62a8 | 212 | EXPORT_SYMBOL(nr_online_nodes); |
418508c1 MS |
213 | #endif |
214 | ||
9ef9acb0 MG |
215 | int page_group_by_mobility_disabled __read_mostly; |
216 | ||
b2a0ac88 MG |
217 | static void set_pageblock_migratetype(struct page *page, int migratetype) |
218 | { | |
49255c61 MG |
219 | |
220 | if (unlikely(page_group_by_mobility_disabled)) | |
221 | migratetype = MIGRATE_UNMOVABLE; | |
222 | ||
b2a0ac88 MG |
223 | set_pageblock_flags_group(page, (unsigned long)migratetype, |
224 | PB_migrate, PB_migrate_end); | |
225 | } | |
226 | ||
7f33d49a RW |
227 | bool oom_killer_disabled __read_mostly; |
228 | ||
13e7444b | 229 | #ifdef CONFIG_DEBUG_VM |
c6a57e19 | 230 | static int page_outside_zone_boundaries(struct zone *zone, struct page *page) |
1da177e4 | 231 | { |
bdc8cb98 DH |
232 | int ret = 0; |
233 | unsigned seq; | |
234 | unsigned long pfn = page_to_pfn(page); | |
c6a57e19 | 235 | |
bdc8cb98 DH |
236 | do { |
237 | seq = zone_span_seqbegin(zone); | |
238 | if (pfn >= zone->zone_start_pfn + zone->spanned_pages) | |
239 | ret = 1; | |
240 | else if (pfn < zone->zone_start_pfn) | |
241 | ret = 1; | |
242 | } while (zone_span_seqretry(zone, seq)); | |
243 | ||
244 | return ret; | |
c6a57e19 DH |
245 | } |
246 | ||
247 | static int page_is_consistent(struct zone *zone, struct page *page) | |
248 | { | |
14e07298 | 249 | if (!pfn_valid_within(page_to_pfn(page))) |
c6a57e19 | 250 | return 0; |
1da177e4 | 251 | if (zone != page_zone(page)) |
c6a57e19 DH |
252 | return 0; |
253 | ||
254 | return 1; | |
255 | } | |
256 | /* | |
257 | * Temporary debugging check for pages not lying within a given zone. | |
258 | */ | |
259 | static int bad_range(struct zone *zone, struct page *page) | |
260 | { | |
261 | if (page_outside_zone_boundaries(zone, page)) | |
1da177e4 | 262 | return 1; |
c6a57e19 DH |
263 | if (!page_is_consistent(zone, page)) |
264 | return 1; | |
265 | ||
1da177e4 LT |
266 | return 0; |
267 | } | |
13e7444b NP |
268 | #else |
269 | static inline int bad_range(struct zone *zone, struct page *page) | |
270 | { | |
271 | return 0; | |
272 | } | |
273 | #endif | |
274 | ||
224abf92 | 275 | static void bad_page(struct page *page) |
1da177e4 | 276 | { |
d936cf9b HD |
277 | static unsigned long resume; |
278 | static unsigned long nr_shown; | |
279 | static unsigned long nr_unshown; | |
280 | ||
2a7684a2 WF |
281 | /* Don't complain about poisoned pages */ |
282 | if (PageHWPoison(page)) { | |
283 | __ClearPageBuddy(page); | |
284 | return; | |
285 | } | |
286 | ||
d936cf9b HD |
287 | /* |
288 | * Allow a burst of 60 reports, then keep quiet for that minute; | |
289 | * or allow a steady drip of one report per second. | |
290 | */ | |
291 | if (nr_shown == 60) { | |
292 | if (time_before(jiffies, resume)) { | |
293 | nr_unshown++; | |
294 | goto out; | |
295 | } | |
296 | if (nr_unshown) { | |
1e9e6365 HD |
297 | printk(KERN_ALERT |
298 | "BUG: Bad page state: %lu messages suppressed\n", | |
d936cf9b HD |
299 | nr_unshown); |
300 | nr_unshown = 0; | |
301 | } | |
302 | nr_shown = 0; | |
303 | } | |
304 | if (nr_shown++ == 0) | |
305 | resume = jiffies + 60 * HZ; | |
306 | ||
1e9e6365 | 307 | printk(KERN_ALERT "BUG: Bad page state in process %s pfn:%05lx\n", |
3dc14741 | 308 | current->comm, page_to_pfn(page)); |
718a3821 | 309 | dump_page(page); |
3dc14741 | 310 | |
1da177e4 | 311 | dump_stack(); |
d936cf9b | 312 | out: |
8cc3b392 HD |
313 | /* Leave bad fields for debug, except PageBuddy could make trouble */ |
314 | __ClearPageBuddy(page); | |
9f158333 | 315 | add_taint(TAINT_BAD_PAGE); |
1da177e4 LT |
316 | } |
317 | ||
1da177e4 LT |
318 | /* |
319 | * Higher-order pages are called "compound pages". They are structured thusly: | |
320 | * | |
321 | * The first PAGE_SIZE page is called the "head page". | |
322 | * | |
323 | * The remaining PAGE_SIZE pages are called "tail pages". | |
324 | * | |
325 | * All pages have PG_compound set. All pages have their ->private pointing at | |
326 | * the head page (even the head page has this). | |
327 | * | |
41d78ba5 HD |
328 | * The first tail page's ->lru.next holds the address of the compound page's |
329 | * put_page() function. Its ->lru.prev holds the order of allocation. | |
330 | * This usage means that zero-order pages may not be compound. | |
1da177e4 | 331 | */ |
d98c7a09 HD |
332 | |
333 | static void free_compound_page(struct page *page) | |
334 | { | |
d85f3385 | 335 | __free_pages_ok(page, compound_order(page)); |
d98c7a09 HD |
336 | } |
337 | ||
01ad1c08 | 338 | void prep_compound_page(struct page *page, unsigned long order) |
18229df5 AW |
339 | { |
340 | int i; | |
341 | int nr_pages = 1 << order; | |
342 | ||
343 | set_compound_page_dtor(page, free_compound_page); | |
344 | set_compound_order(page, order); | |
345 | __SetPageHead(page); | |
346 | for (i = 1; i < nr_pages; i++) { | |
347 | struct page *p = page + i; | |
348 | ||
349 | __SetPageTail(p); | |
350 | p->first_page = page; | |
351 | } | |
352 | } | |
353 | ||
8cc3b392 | 354 | static int destroy_compound_page(struct page *page, unsigned long order) |
1da177e4 LT |
355 | { |
356 | int i; | |
357 | int nr_pages = 1 << order; | |
8cc3b392 | 358 | int bad = 0; |
1da177e4 | 359 | |
8cc3b392 HD |
360 | if (unlikely(compound_order(page) != order) || |
361 | unlikely(!PageHead(page))) { | |
224abf92 | 362 | bad_page(page); |
8cc3b392 HD |
363 | bad++; |
364 | } | |
1da177e4 | 365 | |
6d777953 | 366 | __ClearPageHead(page); |
8cc3b392 | 367 | |
18229df5 AW |
368 | for (i = 1; i < nr_pages; i++) { |
369 | struct page *p = page + i; | |
1da177e4 | 370 | |
e713a21d | 371 | if (unlikely(!PageTail(p) || (p->first_page != page))) { |
224abf92 | 372 | bad_page(page); |
8cc3b392 HD |
373 | bad++; |
374 | } | |
d85f3385 | 375 | __ClearPageTail(p); |
1da177e4 | 376 | } |
8cc3b392 HD |
377 | |
378 | return bad; | |
1da177e4 | 379 | } |
1da177e4 | 380 | |
17cf4406 NP |
381 | static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags) |
382 | { | |
383 | int i; | |
384 | ||
6626c5d5 AM |
385 | /* |
386 | * clear_highpage() will use KM_USER0, so it's a bug to use __GFP_ZERO | |
387 | * and __GFP_HIGHMEM from hard or soft interrupt context. | |
388 | */ | |
725d704e | 389 | VM_BUG_ON((gfp_flags & __GFP_HIGHMEM) && in_interrupt()); |
17cf4406 NP |
390 | for (i = 0; i < (1 << order); i++) |
391 | clear_highpage(page + i); | |
392 | } | |
393 | ||
6aa3001b AM |
394 | static inline void set_page_order(struct page *page, int order) |
395 | { | |
4c21e2f2 | 396 | set_page_private(page, order); |
676165a8 | 397 | __SetPageBuddy(page); |
1da177e4 LT |
398 | } |
399 | ||
400 | static inline void rmv_page_order(struct page *page) | |
401 | { | |
676165a8 | 402 | __ClearPageBuddy(page); |
4c21e2f2 | 403 | set_page_private(page, 0); |
1da177e4 LT |
404 | } |
405 | ||
406 | /* | |
407 | * Locate the struct page for both the matching buddy in our | |
408 | * pair (buddy1) and the combined O(n+1) page they form (page). | |
409 | * | |
410 | * 1) Any buddy B1 will have an order O twin B2 which satisfies | |
411 | * the following equation: | |
412 | * B2 = B1 ^ (1 << O) | |
413 | * For example, if the starting buddy (buddy2) is #8 its order | |
414 | * 1 buddy is #10: | |
415 | * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10 | |
416 | * | |
417 | * 2) Any buddy B will have an order O+1 parent P which | |
418 | * satisfies the following equation: | |
419 | * P = B & ~(1 << O) | |
420 | * | |
d6e05edc | 421 | * Assumption: *_mem_map is contiguous at least up to MAX_ORDER |
1da177e4 LT |
422 | */ |
423 | static inline struct page * | |
424 | __page_find_buddy(struct page *page, unsigned long page_idx, unsigned int order) | |
425 | { | |
426 | unsigned long buddy_idx = page_idx ^ (1 << order); | |
427 | ||
428 | return page + (buddy_idx - page_idx); | |
429 | } | |
430 | ||
431 | static inline unsigned long | |
432 | __find_combined_index(unsigned long page_idx, unsigned int order) | |
433 | { | |
434 | return (page_idx & ~(1 << order)); | |
435 | } | |
436 | ||
437 | /* | |
438 | * This function checks whether a page is free && is the buddy | |
439 | * we can do coalesce a page and its buddy if | |
13e7444b | 440 | * (a) the buddy is not in a hole && |
676165a8 | 441 | * (b) the buddy is in the buddy system && |
cb2b95e1 AW |
442 | * (c) a page and its buddy have the same order && |
443 | * (d) a page and its buddy are in the same zone. | |
676165a8 NP |
444 | * |
445 | * For recording whether a page is in the buddy system, we use PG_buddy. | |
446 | * Setting, clearing, and testing PG_buddy is serialized by zone->lock. | |
1da177e4 | 447 | * |
676165a8 | 448 | * For recording page's order, we use page_private(page). |
1da177e4 | 449 | */ |
cb2b95e1 AW |
450 | static inline int page_is_buddy(struct page *page, struct page *buddy, |
451 | int order) | |
1da177e4 | 452 | { |
14e07298 | 453 | if (!pfn_valid_within(page_to_pfn(buddy))) |
13e7444b | 454 | return 0; |
13e7444b | 455 | |
cb2b95e1 AW |
456 | if (page_zone_id(page) != page_zone_id(buddy)) |
457 | return 0; | |
458 | ||
459 | if (PageBuddy(buddy) && page_order(buddy) == order) { | |
a3af9c38 | 460 | VM_BUG_ON(page_count(buddy) != 0); |
6aa3001b | 461 | return 1; |
676165a8 | 462 | } |
6aa3001b | 463 | return 0; |
1da177e4 LT |
464 | } |
465 | ||
466 | /* | |
467 | * Freeing function for a buddy system allocator. | |
468 | * | |
469 | * The concept of a buddy system is to maintain direct-mapped table | |
470 | * (containing bit values) for memory blocks of various "orders". | |
471 | * The bottom level table contains the map for the smallest allocatable | |
472 | * units of memory (here, pages), and each level above it describes | |
473 | * pairs of units from the levels below, hence, "buddies". | |
474 | * At a high level, all that happens here is marking the table entry | |
475 | * at the bottom level available, and propagating the changes upward | |
476 | * as necessary, plus some accounting needed to play nicely with other | |
477 | * parts of the VM system. | |
478 | * At each level, we keep a list of pages, which are heads of continuous | |
676165a8 | 479 | * free pages of length of (1 << order) and marked with PG_buddy. Page's |
4c21e2f2 | 480 | * order is recorded in page_private(page) field. |
1da177e4 LT |
481 | * So when we are allocating or freeing one, we can derive the state of the |
482 | * other. That is, if we allocate a small block, and both were | |
483 | * free, the remainder of the region must be split into blocks. | |
484 | * If a block is freed, and its buddy is also free, then this | |
485 | * triggers coalescing into a block of larger size. | |
486 | * | |
487 | * -- wli | |
488 | */ | |
489 | ||
48db57f8 | 490 | static inline void __free_one_page(struct page *page, |
ed0ae21d MG |
491 | struct zone *zone, unsigned int order, |
492 | int migratetype) | |
1da177e4 LT |
493 | { |
494 | unsigned long page_idx; | |
6dda9d55 CZ |
495 | unsigned long combined_idx; |
496 | struct page *buddy; | |
1da177e4 | 497 | |
224abf92 | 498 | if (unlikely(PageCompound(page))) |
8cc3b392 HD |
499 | if (unlikely(destroy_compound_page(page, order))) |
500 | return; | |
1da177e4 | 501 | |
ed0ae21d MG |
502 | VM_BUG_ON(migratetype == -1); |
503 | ||
1da177e4 LT |
504 | page_idx = page_to_pfn(page) & ((1 << MAX_ORDER) - 1); |
505 | ||
f2260e6b | 506 | VM_BUG_ON(page_idx & ((1 << order) - 1)); |
725d704e | 507 | VM_BUG_ON(bad_range(zone, page)); |
1da177e4 | 508 | |
1da177e4 | 509 | while (order < MAX_ORDER-1) { |
1da177e4 | 510 | buddy = __page_find_buddy(page, page_idx, order); |
cb2b95e1 | 511 | if (!page_is_buddy(page, buddy, order)) |
3c82d0ce | 512 | break; |
13e7444b | 513 | |
3c82d0ce | 514 | /* Our buddy is free, merge with it and move up one order. */ |
1da177e4 | 515 | list_del(&buddy->lru); |
b2a0ac88 | 516 | zone->free_area[order].nr_free--; |
1da177e4 | 517 | rmv_page_order(buddy); |
13e7444b | 518 | combined_idx = __find_combined_index(page_idx, order); |
1da177e4 LT |
519 | page = page + (combined_idx - page_idx); |
520 | page_idx = combined_idx; | |
521 | order++; | |
522 | } | |
523 | set_page_order(page, order); | |
6dda9d55 CZ |
524 | |
525 | /* | |
526 | * If this is not the largest possible page, check if the buddy | |
527 | * of the next-highest order is free. If it is, it's possible | |
528 | * that pages are being freed that will coalesce soon. In case, | |
529 | * that is happening, add the free page to the tail of the list | |
530 | * so it's less likely to be used soon and more likely to be merged | |
531 | * as a higher order page | |
532 | */ | |
533 | if ((order < MAX_ORDER-1) && pfn_valid_within(page_to_pfn(buddy))) { | |
534 | struct page *higher_page, *higher_buddy; | |
535 | combined_idx = __find_combined_index(page_idx, order); | |
536 | higher_page = page + combined_idx - page_idx; | |
537 | higher_buddy = __page_find_buddy(higher_page, combined_idx, order + 1); | |
538 | if (page_is_buddy(higher_page, higher_buddy, order + 1)) { | |
539 | list_add_tail(&page->lru, | |
540 | &zone->free_area[order].free_list[migratetype]); | |
541 | goto out; | |
542 | } | |
543 | } | |
544 | ||
545 | list_add(&page->lru, &zone->free_area[order].free_list[migratetype]); | |
546 | out: | |
1da177e4 LT |
547 | zone->free_area[order].nr_free++; |
548 | } | |
549 | ||
092cead6 KM |
550 | /* |
551 | * free_page_mlock() -- clean up attempts to free and mlocked() page. | |
552 | * Page should not be on lru, so no need to fix that up. | |
553 | * free_pages_check() will verify... | |
554 | */ | |
555 | static inline void free_page_mlock(struct page *page) | |
556 | { | |
092cead6 KM |
557 | __dec_zone_page_state(page, NR_MLOCK); |
558 | __count_vm_event(UNEVICTABLE_MLOCKFREED); | |
559 | } | |
092cead6 | 560 | |
224abf92 | 561 | static inline int free_pages_check(struct page *page) |
1da177e4 | 562 | { |
92be2e33 NP |
563 | if (unlikely(page_mapcount(page) | |
564 | (page->mapping != NULL) | | |
a3af9c38 | 565 | (atomic_read(&page->_count) != 0) | |
8cc3b392 | 566 | (page->flags & PAGE_FLAGS_CHECK_AT_FREE))) { |
224abf92 | 567 | bad_page(page); |
79f4b7bf | 568 | return 1; |
8cc3b392 | 569 | } |
79f4b7bf HD |
570 | if (page->flags & PAGE_FLAGS_CHECK_AT_PREP) |
571 | page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP; | |
572 | return 0; | |
1da177e4 LT |
573 | } |
574 | ||
575 | /* | |
5f8dcc21 | 576 | * Frees a number of pages from the PCP lists |
1da177e4 | 577 | * Assumes all pages on list are in same zone, and of same order. |
207f36ee | 578 | * count is the number of pages to free. |
1da177e4 LT |
579 | * |
580 | * If the zone was previously in an "all pages pinned" state then look to | |
581 | * see if this freeing clears that state. | |
582 | * | |
583 | * And clear the zone's pages_scanned counter, to hold off the "all pages are | |
584 | * pinned" detection logic. | |
585 | */ | |
5f8dcc21 MG |
586 | static void free_pcppages_bulk(struct zone *zone, int count, |
587 | struct per_cpu_pages *pcp) | |
1da177e4 | 588 | { |
5f8dcc21 | 589 | int migratetype = 0; |
a6f9edd6 | 590 | int batch_free = 0; |
72853e29 | 591 | int to_free = count; |
5f8dcc21 | 592 | |
c54ad30c | 593 | spin_lock(&zone->lock); |
93e4a89a | 594 | zone->all_unreclaimable = 0; |
1da177e4 | 595 | zone->pages_scanned = 0; |
f2260e6b | 596 | |
72853e29 | 597 | while (to_free) { |
48db57f8 | 598 | struct page *page; |
5f8dcc21 MG |
599 | struct list_head *list; |
600 | ||
601 | /* | |
a6f9edd6 MG |
602 | * Remove pages from lists in a round-robin fashion. A |
603 | * batch_free count is maintained that is incremented when an | |
604 | * empty list is encountered. This is so more pages are freed | |
605 | * off fuller lists instead of spinning excessively around empty | |
606 | * lists | |
5f8dcc21 MG |
607 | */ |
608 | do { | |
a6f9edd6 | 609 | batch_free++; |
5f8dcc21 MG |
610 | if (++migratetype == MIGRATE_PCPTYPES) |
611 | migratetype = 0; | |
612 | list = &pcp->lists[migratetype]; | |
613 | } while (list_empty(list)); | |
48db57f8 | 614 | |
a6f9edd6 MG |
615 | do { |
616 | page = list_entry(list->prev, struct page, lru); | |
617 | /* must delete as __free_one_page list manipulates */ | |
618 | list_del(&page->lru); | |
a7016235 HD |
619 | /* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */ |
620 | __free_one_page(page, zone, 0, page_private(page)); | |
621 | trace_mm_page_pcpu_drain(page, 0, page_private(page)); | |
72853e29 | 622 | } while (--to_free && --batch_free && !list_empty(list)); |
1da177e4 | 623 | } |
72853e29 | 624 | __mod_zone_page_state(zone, NR_FREE_PAGES, count); |
c54ad30c | 625 | spin_unlock(&zone->lock); |
1da177e4 LT |
626 | } |
627 | ||
ed0ae21d MG |
628 | static void free_one_page(struct zone *zone, struct page *page, int order, |
629 | int migratetype) | |
1da177e4 | 630 | { |
006d22d9 | 631 | spin_lock(&zone->lock); |
93e4a89a | 632 | zone->all_unreclaimable = 0; |
006d22d9 | 633 | zone->pages_scanned = 0; |
f2260e6b | 634 | |
ed0ae21d | 635 | __free_one_page(page, zone, order, migratetype); |
72853e29 | 636 | __mod_zone_page_state(zone, NR_FREE_PAGES, 1 << order); |
006d22d9 | 637 | spin_unlock(&zone->lock); |
48db57f8 NP |
638 | } |
639 | ||
ec95f53a | 640 | static bool free_pages_prepare(struct page *page, unsigned int order) |
48db57f8 | 641 | { |
1da177e4 | 642 | int i; |
8cc3b392 | 643 | int bad = 0; |
1da177e4 | 644 | |
f650316c | 645 | trace_mm_page_free_direct(page, order); |
b1eeab67 VN |
646 | kmemcheck_free_shadow(page, order); |
647 | ||
ec95f53a KM |
648 | for (i = 0; i < (1 << order); i++) { |
649 | struct page *pg = page + i; | |
650 | ||
651 | if (PageAnon(pg)) | |
652 | pg->mapping = NULL; | |
653 | bad += free_pages_check(pg); | |
654 | } | |
8cc3b392 | 655 | if (bad) |
ec95f53a | 656 | return false; |
689bcebf | 657 | |
3ac7fe5a | 658 | if (!PageHighMem(page)) { |
9858db50 | 659 | debug_check_no_locks_freed(page_address(page),PAGE_SIZE<<order); |
3ac7fe5a TG |
660 | debug_check_no_obj_freed(page_address(page), |
661 | PAGE_SIZE << order); | |
662 | } | |
dafb1367 | 663 | arch_free_page(page, order); |
48db57f8 | 664 | kernel_map_pages(page, 1 << order, 0); |
dafb1367 | 665 | |
ec95f53a KM |
666 | return true; |
667 | } | |
668 | ||
669 | static void __free_pages_ok(struct page *page, unsigned int order) | |
670 | { | |
671 | unsigned long flags; | |
672 | int wasMlocked = __TestClearPageMlocked(page); | |
673 | ||
674 | if (!free_pages_prepare(page, order)) | |
675 | return; | |
676 | ||
c54ad30c | 677 | local_irq_save(flags); |
c277331d | 678 | if (unlikely(wasMlocked)) |
da456f14 | 679 | free_page_mlock(page); |
f8891e5e | 680 | __count_vm_events(PGFREE, 1 << order); |
ed0ae21d MG |
681 | free_one_page(page_zone(page), page, order, |
682 | get_pageblock_migratetype(page)); | |
c54ad30c | 683 | local_irq_restore(flags); |
1da177e4 LT |
684 | } |
685 | ||
a226f6c8 DH |
686 | /* |
687 | * permit the bootmem allocator to evade page validation on high-order frees | |
688 | */ | |
af370fb8 | 689 | void __meminit __free_pages_bootmem(struct page *page, unsigned int order) |
a226f6c8 DH |
690 | { |
691 | if (order == 0) { | |
692 | __ClearPageReserved(page); | |
693 | set_page_count(page, 0); | |
7835e98b | 694 | set_page_refcounted(page); |
545b1ea9 | 695 | __free_page(page); |
a226f6c8 | 696 | } else { |
a226f6c8 DH |
697 | int loop; |
698 | ||
545b1ea9 | 699 | prefetchw(page); |
a226f6c8 DH |
700 | for (loop = 0; loop < BITS_PER_LONG; loop++) { |
701 | struct page *p = &page[loop]; | |
702 | ||
545b1ea9 NP |
703 | if (loop + 1 < BITS_PER_LONG) |
704 | prefetchw(p + 1); | |
a226f6c8 DH |
705 | __ClearPageReserved(p); |
706 | set_page_count(p, 0); | |
707 | } | |
708 | ||
7835e98b | 709 | set_page_refcounted(page); |
545b1ea9 | 710 | __free_pages(page, order); |
a226f6c8 DH |
711 | } |
712 | } | |
713 | ||
1da177e4 LT |
714 | |
715 | /* | |
716 | * The order of subdivision here is critical for the IO subsystem. | |
717 | * Please do not alter this order without good reasons and regression | |
718 | * testing. Specifically, as large blocks of memory are subdivided, | |
719 | * the order in which smaller blocks are delivered depends on the order | |
720 | * they're subdivided in this function. This is the primary factor | |
721 | * influencing the order in which pages are delivered to the IO | |
722 | * subsystem according to empirical testing, and this is also justified | |
723 | * by considering the behavior of a buddy system containing a single | |
724 | * large block of memory acted on by a series of small allocations. | |
725 | * This behavior is a critical factor in sglist merging's success. | |
726 | * | |
727 | * -- wli | |
728 | */ | |
085cc7d5 | 729 | static inline void expand(struct zone *zone, struct page *page, |
b2a0ac88 MG |
730 | int low, int high, struct free_area *area, |
731 | int migratetype) | |
1da177e4 LT |
732 | { |
733 | unsigned long size = 1 << high; | |
734 | ||
735 | while (high > low) { | |
736 | area--; | |
737 | high--; | |
738 | size >>= 1; | |
725d704e | 739 | VM_BUG_ON(bad_range(zone, &page[size])); |
b2a0ac88 | 740 | list_add(&page[size].lru, &area->free_list[migratetype]); |
1da177e4 LT |
741 | area->nr_free++; |
742 | set_page_order(&page[size], high); | |
743 | } | |
1da177e4 LT |
744 | } |
745 | ||
1da177e4 LT |
746 | /* |
747 | * This page is about to be returned from the page allocator | |
748 | */ | |
2a7684a2 | 749 | static inline int check_new_page(struct page *page) |
1da177e4 | 750 | { |
92be2e33 NP |
751 | if (unlikely(page_mapcount(page) | |
752 | (page->mapping != NULL) | | |
a3af9c38 | 753 | (atomic_read(&page->_count) != 0) | |
8cc3b392 | 754 | (page->flags & PAGE_FLAGS_CHECK_AT_PREP))) { |
224abf92 | 755 | bad_page(page); |
689bcebf | 756 | return 1; |
8cc3b392 | 757 | } |
2a7684a2 WF |
758 | return 0; |
759 | } | |
760 | ||
761 | static int prep_new_page(struct page *page, int order, gfp_t gfp_flags) | |
762 | { | |
763 | int i; | |
764 | ||
765 | for (i = 0; i < (1 << order); i++) { | |
766 | struct page *p = page + i; | |
767 | if (unlikely(check_new_page(p))) | |
768 | return 1; | |
769 | } | |
689bcebf | 770 | |
4c21e2f2 | 771 | set_page_private(page, 0); |
7835e98b | 772 | set_page_refcounted(page); |
cc102509 NP |
773 | |
774 | arch_alloc_page(page, order); | |
1da177e4 | 775 | kernel_map_pages(page, 1 << order, 1); |
17cf4406 NP |
776 | |
777 | if (gfp_flags & __GFP_ZERO) | |
778 | prep_zero_page(page, order, gfp_flags); | |
779 | ||
780 | if (order && (gfp_flags & __GFP_COMP)) | |
781 | prep_compound_page(page, order); | |
782 | ||
689bcebf | 783 | return 0; |
1da177e4 LT |
784 | } |
785 | ||
56fd56b8 MG |
786 | /* |
787 | * Go through the free lists for the given migratetype and remove | |
788 | * the smallest available page from the freelists | |
789 | */ | |
728ec980 MG |
790 | static inline |
791 | struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, | |
56fd56b8 MG |
792 | int migratetype) |
793 | { | |
794 | unsigned int current_order; | |
795 | struct free_area * area; | |
796 | struct page *page; | |
797 | ||
798 | /* Find a page of the appropriate size in the preferred list */ | |
799 | for (current_order = order; current_order < MAX_ORDER; ++current_order) { | |
800 | area = &(zone->free_area[current_order]); | |
801 | if (list_empty(&area->free_list[migratetype])) | |
802 | continue; | |
803 | ||
804 | page = list_entry(area->free_list[migratetype].next, | |
805 | struct page, lru); | |
806 | list_del(&page->lru); | |
807 | rmv_page_order(page); | |
808 | area->nr_free--; | |
56fd56b8 MG |
809 | expand(zone, page, order, current_order, area, migratetype); |
810 | return page; | |
811 | } | |
812 | ||
813 | return NULL; | |
814 | } | |
815 | ||
816 | ||
b2a0ac88 MG |
817 | /* |
818 | * This array describes the order lists are fallen back to when | |
819 | * the free lists for the desirable migrate type are depleted | |
820 | */ | |
821 | static int fallbacks[MIGRATE_TYPES][MIGRATE_TYPES-1] = { | |
64c5e135 MG |
822 | [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE, MIGRATE_RESERVE }, |
823 | [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_RESERVE }, | |
824 | [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_RESERVE }, | |
825 | [MIGRATE_RESERVE] = { MIGRATE_RESERVE, MIGRATE_RESERVE, MIGRATE_RESERVE }, /* Never used */ | |
b2a0ac88 MG |
826 | }; |
827 | ||
c361be55 MG |
828 | /* |
829 | * Move the free pages in a range to the free lists of the requested type. | |
d9c23400 | 830 | * Note that start_page and end_pages are not aligned on a pageblock |
c361be55 MG |
831 | * boundary. If alignment is required, use move_freepages_block() |
832 | */ | |
b69a7288 AB |
833 | static int move_freepages(struct zone *zone, |
834 | struct page *start_page, struct page *end_page, | |
835 | int migratetype) | |
c361be55 MG |
836 | { |
837 | struct page *page; | |
838 | unsigned long order; | |
d100313f | 839 | int pages_moved = 0; |
c361be55 MG |
840 | |
841 | #ifndef CONFIG_HOLES_IN_ZONE | |
842 | /* | |
843 | * page_zone is not safe to call in this context when | |
844 | * CONFIG_HOLES_IN_ZONE is set. This bug check is probably redundant | |
845 | * anyway as we check zone boundaries in move_freepages_block(). | |
846 | * Remove at a later date when no bug reports exist related to | |
ac0e5b7a | 847 | * grouping pages by mobility |
c361be55 MG |
848 | */ |
849 | BUG_ON(page_zone(start_page) != page_zone(end_page)); | |
850 | #endif | |
851 | ||
852 | for (page = start_page; page <= end_page;) { | |
344c790e AL |
853 | /* Make sure we are not inadvertently changing nodes */ |
854 | VM_BUG_ON(page_to_nid(page) != zone_to_nid(zone)); | |
855 | ||
c361be55 MG |
856 | if (!pfn_valid_within(page_to_pfn(page))) { |
857 | page++; | |
858 | continue; | |
859 | } | |
860 | ||
861 | if (!PageBuddy(page)) { | |
862 | page++; | |
863 | continue; | |
864 | } | |
865 | ||
866 | order = page_order(page); | |
867 | list_del(&page->lru); | |
868 | list_add(&page->lru, | |
869 | &zone->free_area[order].free_list[migratetype]); | |
870 | page += 1 << order; | |
d100313f | 871 | pages_moved += 1 << order; |
c361be55 MG |
872 | } |
873 | ||
d100313f | 874 | return pages_moved; |
c361be55 MG |
875 | } |
876 | ||
b69a7288 AB |
877 | static int move_freepages_block(struct zone *zone, struct page *page, |
878 | int migratetype) | |
c361be55 MG |
879 | { |
880 | unsigned long start_pfn, end_pfn; | |
881 | struct page *start_page, *end_page; | |
882 | ||
883 | start_pfn = page_to_pfn(page); | |
d9c23400 | 884 | start_pfn = start_pfn & ~(pageblock_nr_pages-1); |
c361be55 | 885 | start_page = pfn_to_page(start_pfn); |
d9c23400 MG |
886 | end_page = start_page + pageblock_nr_pages - 1; |
887 | end_pfn = start_pfn + pageblock_nr_pages - 1; | |
c361be55 MG |
888 | |
889 | /* Do not cross zone boundaries */ | |
890 | if (start_pfn < zone->zone_start_pfn) | |
891 | start_page = page; | |
892 | if (end_pfn >= zone->zone_start_pfn + zone->spanned_pages) | |
893 | return 0; | |
894 | ||
895 | return move_freepages(zone, start_page, end_page, migratetype); | |
896 | } | |
897 | ||
2f66a68f MG |
898 | static void change_pageblock_range(struct page *pageblock_page, |
899 | int start_order, int migratetype) | |
900 | { | |
901 | int nr_pageblocks = 1 << (start_order - pageblock_order); | |
902 | ||
903 | while (nr_pageblocks--) { | |
904 | set_pageblock_migratetype(pageblock_page, migratetype); | |
905 | pageblock_page += pageblock_nr_pages; | |
906 | } | |
907 | } | |
908 | ||
b2a0ac88 | 909 | /* Remove an element from the buddy allocator from the fallback list */ |
0ac3a409 MG |
910 | static inline struct page * |
911 | __rmqueue_fallback(struct zone *zone, int order, int start_migratetype) | |
b2a0ac88 MG |
912 | { |
913 | struct free_area * area; | |
914 | int current_order; | |
915 | struct page *page; | |
916 | int migratetype, i; | |
917 | ||
918 | /* Find the largest possible block of pages in the other list */ | |
919 | for (current_order = MAX_ORDER-1; current_order >= order; | |
920 | --current_order) { | |
921 | for (i = 0; i < MIGRATE_TYPES - 1; i++) { | |
922 | migratetype = fallbacks[start_migratetype][i]; | |
923 | ||
56fd56b8 MG |
924 | /* MIGRATE_RESERVE handled later if necessary */ |
925 | if (migratetype == MIGRATE_RESERVE) | |
926 | continue; | |
e010487d | 927 | |
b2a0ac88 MG |
928 | area = &(zone->free_area[current_order]); |
929 | if (list_empty(&area->free_list[migratetype])) | |
930 | continue; | |
931 | ||
932 | page = list_entry(area->free_list[migratetype].next, | |
933 | struct page, lru); | |
934 | area->nr_free--; | |
935 | ||
936 | /* | |
c361be55 | 937 | * If breaking a large block of pages, move all free |
46dafbca MG |
938 | * pages to the preferred allocation list. If falling |
939 | * back for a reclaimable kernel allocation, be more | |
940 | * agressive about taking ownership of free pages | |
b2a0ac88 | 941 | */ |
d9c23400 | 942 | if (unlikely(current_order >= (pageblock_order >> 1)) || |
dd5d241e MG |
943 | start_migratetype == MIGRATE_RECLAIMABLE || |
944 | page_group_by_mobility_disabled) { | |
46dafbca MG |
945 | unsigned long pages; |
946 | pages = move_freepages_block(zone, page, | |
947 | start_migratetype); | |
948 | ||
949 | /* Claim the whole block if over half of it is free */ | |
dd5d241e MG |
950 | if (pages >= (1 << (pageblock_order-1)) || |
951 | page_group_by_mobility_disabled) | |
46dafbca MG |
952 | set_pageblock_migratetype(page, |
953 | start_migratetype); | |
954 | ||
b2a0ac88 | 955 | migratetype = start_migratetype; |
c361be55 | 956 | } |
b2a0ac88 MG |
957 | |
958 | /* Remove the page from the freelists */ | |
959 | list_del(&page->lru); | |
960 | rmv_page_order(page); | |
b2a0ac88 | 961 | |
2f66a68f MG |
962 | /* Take ownership for orders >= pageblock_order */ |
963 | if (current_order >= pageblock_order) | |
964 | change_pageblock_range(page, current_order, | |
b2a0ac88 MG |
965 | start_migratetype); |
966 | ||
967 | expand(zone, page, order, current_order, area, migratetype); | |
e0fff1bd MG |
968 | |
969 | trace_mm_page_alloc_extfrag(page, order, current_order, | |
970 | start_migratetype, migratetype); | |
971 | ||
b2a0ac88 MG |
972 | return page; |
973 | } | |
974 | } | |
975 | ||
728ec980 | 976 | return NULL; |
b2a0ac88 MG |
977 | } |
978 | ||
56fd56b8 | 979 | /* |
1da177e4 LT |
980 | * Do the hard work of removing an element from the buddy allocator. |
981 | * Call me with the zone->lock already held. | |
982 | */ | |
b2a0ac88 MG |
983 | static struct page *__rmqueue(struct zone *zone, unsigned int order, |
984 | int migratetype) | |
1da177e4 | 985 | { |
1da177e4 LT |
986 | struct page *page; |
987 | ||
728ec980 | 988 | retry_reserve: |
56fd56b8 | 989 | page = __rmqueue_smallest(zone, order, migratetype); |
b2a0ac88 | 990 | |
728ec980 | 991 | if (unlikely(!page) && migratetype != MIGRATE_RESERVE) { |
56fd56b8 | 992 | page = __rmqueue_fallback(zone, order, migratetype); |
b2a0ac88 | 993 | |
728ec980 MG |
994 | /* |
995 | * Use MIGRATE_RESERVE rather than fail an allocation. goto | |
996 | * is used because __rmqueue_smallest is an inline function | |
997 | * and we want just one call site | |
998 | */ | |
999 | if (!page) { | |
1000 | migratetype = MIGRATE_RESERVE; | |
1001 | goto retry_reserve; | |
1002 | } | |
1003 | } | |
1004 | ||
0d3d062a | 1005 | trace_mm_page_alloc_zone_locked(page, order, migratetype); |
b2a0ac88 | 1006 | return page; |
1da177e4 LT |
1007 | } |
1008 | ||
1009 | /* | |
1010 | * Obtain a specified number of elements from the buddy allocator, all under | |
1011 | * a single hold of the lock, for efficiency. Add them to the supplied list. | |
1012 | * Returns the number of new pages which were placed at *list. | |
1013 | */ | |
1014 | static int rmqueue_bulk(struct zone *zone, unsigned int order, | |
b2a0ac88 | 1015 | unsigned long count, struct list_head *list, |
e084b2d9 | 1016 | int migratetype, int cold) |
1da177e4 | 1017 | { |
1da177e4 | 1018 | int i; |
1da177e4 | 1019 | |
c54ad30c | 1020 | spin_lock(&zone->lock); |
1da177e4 | 1021 | for (i = 0; i < count; ++i) { |
b2a0ac88 | 1022 | struct page *page = __rmqueue(zone, order, migratetype); |
085cc7d5 | 1023 | if (unlikely(page == NULL)) |
1da177e4 | 1024 | break; |
81eabcbe MG |
1025 | |
1026 | /* | |
1027 | * Split buddy pages returned by expand() are received here | |
1028 | * in physical page order. The page is added to the callers and | |
1029 | * list and the list head then moves forward. From the callers | |
1030 | * perspective, the linked list is ordered by page number in | |
1031 | * some conditions. This is useful for IO devices that can | |
1032 | * merge IO requests if the physical pages are ordered | |
1033 | * properly. | |
1034 | */ | |
e084b2d9 MG |
1035 | if (likely(cold == 0)) |
1036 | list_add(&page->lru, list); | |
1037 | else | |
1038 | list_add_tail(&page->lru, list); | |
535131e6 | 1039 | set_page_private(page, migratetype); |
81eabcbe | 1040 | list = &page->lru; |
1da177e4 | 1041 | } |
f2260e6b | 1042 | __mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order)); |
c54ad30c | 1043 | spin_unlock(&zone->lock); |
085cc7d5 | 1044 | return i; |
1da177e4 LT |
1045 | } |
1046 | ||
4ae7c039 | 1047 | #ifdef CONFIG_NUMA |
8fce4d8e | 1048 | /* |
4037d452 CL |
1049 | * Called from the vmstat counter updater to drain pagesets of this |
1050 | * currently executing processor on remote nodes after they have | |
1051 | * expired. | |
1052 | * | |
879336c3 CL |
1053 | * Note that this function must be called with the thread pinned to |
1054 | * a single processor. | |
8fce4d8e | 1055 | */ |
4037d452 | 1056 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp) |
4ae7c039 | 1057 | { |
4ae7c039 | 1058 | unsigned long flags; |
4037d452 | 1059 | int to_drain; |
4ae7c039 | 1060 | |
4037d452 CL |
1061 | local_irq_save(flags); |
1062 | if (pcp->count >= pcp->batch) | |
1063 | to_drain = pcp->batch; | |
1064 | else | |
1065 | to_drain = pcp->count; | |
5f8dcc21 | 1066 | free_pcppages_bulk(zone, to_drain, pcp); |
4037d452 CL |
1067 | pcp->count -= to_drain; |
1068 | local_irq_restore(flags); | |
4ae7c039 CL |
1069 | } |
1070 | #endif | |
1071 | ||
9f8f2172 CL |
1072 | /* |
1073 | * Drain pages of the indicated processor. | |
1074 | * | |
1075 | * The processor must either be the current processor and the | |
1076 | * thread pinned to the current processor or a processor that | |
1077 | * is not online. | |
1078 | */ | |
1079 | static void drain_pages(unsigned int cpu) | |
1da177e4 | 1080 | { |
c54ad30c | 1081 | unsigned long flags; |
1da177e4 | 1082 | struct zone *zone; |
1da177e4 | 1083 | |
ee99c71c | 1084 | for_each_populated_zone(zone) { |
1da177e4 | 1085 | struct per_cpu_pageset *pset; |
3dfa5721 | 1086 | struct per_cpu_pages *pcp; |
1da177e4 | 1087 | |
99dcc3e5 CL |
1088 | local_irq_save(flags); |
1089 | pset = per_cpu_ptr(zone->pageset, cpu); | |
3dfa5721 CL |
1090 | |
1091 | pcp = &pset->pcp; | |
5f8dcc21 | 1092 | free_pcppages_bulk(zone, pcp->count, pcp); |
3dfa5721 CL |
1093 | pcp->count = 0; |
1094 | local_irq_restore(flags); | |
1da177e4 LT |
1095 | } |
1096 | } | |
1da177e4 | 1097 | |
9f8f2172 CL |
1098 | /* |
1099 | * Spill all of this CPU's per-cpu pages back into the buddy allocator. | |
1100 | */ | |
1101 | void drain_local_pages(void *arg) | |
1102 | { | |
1103 | drain_pages(smp_processor_id()); | |
1104 | } | |
1105 | ||
1106 | /* | |
1107 | * Spill all the per-cpu pages from all CPUs back into the buddy allocator | |
1108 | */ | |
1109 | void drain_all_pages(void) | |
1110 | { | |
15c8b6c1 | 1111 | on_each_cpu(drain_local_pages, NULL, 1); |
9f8f2172 CL |
1112 | } |
1113 | ||
296699de | 1114 | #ifdef CONFIG_HIBERNATION |
1da177e4 LT |
1115 | |
1116 | void mark_free_pages(struct zone *zone) | |
1117 | { | |
f623f0db RW |
1118 | unsigned long pfn, max_zone_pfn; |
1119 | unsigned long flags; | |
b2a0ac88 | 1120 | int order, t; |
1da177e4 LT |
1121 | struct list_head *curr; |
1122 | ||
1123 | if (!zone->spanned_pages) | |
1124 | return; | |
1125 | ||
1126 | spin_lock_irqsave(&zone->lock, flags); | |
f623f0db RW |
1127 | |
1128 | max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages; | |
1129 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) | |
1130 | if (pfn_valid(pfn)) { | |
1131 | struct page *page = pfn_to_page(pfn); | |
1132 | ||
7be98234 RW |
1133 | if (!swsusp_page_is_forbidden(page)) |
1134 | swsusp_unset_page_free(page); | |
f623f0db | 1135 | } |
1da177e4 | 1136 | |
b2a0ac88 MG |
1137 | for_each_migratetype_order(order, t) { |
1138 | list_for_each(curr, &zone->free_area[order].free_list[t]) { | |
f623f0db | 1139 | unsigned long i; |
1da177e4 | 1140 | |
f623f0db RW |
1141 | pfn = page_to_pfn(list_entry(curr, struct page, lru)); |
1142 | for (i = 0; i < (1UL << order); i++) | |
7be98234 | 1143 | swsusp_set_page_free(pfn_to_page(pfn + i)); |
f623f0db | 1144 | } |
b2a0ac88 | 1145 | } |
1da177e4 LT |
1146 | spin_unlock_irqrestore(&zone->lock, flags); |
1147 | } | |
e2c55dc8 | 1148 | #endif /* CONFIG_PM */ |
1da177e4 | 1149 | |
1da177e4 LT |
1150 | /* |
1151 | * Free a 0-order page | |
fc91668e | 1152 | * cold == 1 ? free a cold page : free a hot page |
1da177e4 | 1153 | */ |
fc91668e | 1154 | void free_hot_cold_page(struct page *page, int cold) |
1da177e4 LT |
1155 | { |
1156 | struct zone *zone = page_zone(page); | |
1157 | struct per_cpu_pages *pcp; | |
1158 | unsigned long flags; | |
5f8dcc21 | 1159 | int migratetype; |
451ea25d | 1160 | int wasMlocked = __TestClearPageMlocked(page); |
1da177e4 | 1161 | |
ec95f53a | 1162 | if (!free_pages_prepare(page, 0)) |
689bcebf HD |
1163 | return; |
1164 | ||
5f8dcc21 MG |
1165 | migratetype = get_pageblock_migratetype(page); |
1166 | set_page_private(page, migratetype); | |
1da177e4 | 1167 | local_irq_save(flags); |
c277331d | 1168 | if (unlikely(wasMlocked)) |
da456f14 | 1169 | free_page_mlock(page); |
f8891e5e | 1170 | __count_vm_event(PGFREE); |
da456f14 | 1171 | |
5f8dcc21 MG |
1172 | /* |
1173 | * We only track unmovable, reclaimable and movable on pcp lists. | |
1174 | * Free ISOLATE pages back to the allocator because they are being | |
1175 | * offlined but treat RESERVE as movable pages so we can get those | |
1176 | * areas back if necessary. Otherwise, we may have to free | |
1177 | * excessively into the page allocator | |
1178 | */ | |
1179 | if (migratetype >= MIGRATE_PCPTYPES) { | |
1180 | if (unlikely(migratetype == MIGRATE_ISOLATE)) { | |
1181 | free_one_page(zone, page, 0, migratetype); | |
1182 | goto out; | |
1183 | } | |
1184 | migratetype = MIGRATE_MOVABLE; | |
1185 | } | |
1186 | ||
99dcc3e5 | 1187 | pcp = &this_cpu_ptr(zone->pageset)->pcp; |
3dfa5721 | 1188 | if (cold) |
5f8dcc21 | 1189 | list_add_tail(&page->lru, &pcp->lists[migratetype]); |
3dfa5721 | 1190 | else |
5f8dcc21 | 1191 | list_add(&page->lru, &pcp->lists[migratetype]); |
1da177e4 | 1192 | pcp->count++; |
48db57f8 | 1193 | if (pcp->count >= pcp->high) { |
5f8dcc21 | 1194 | free_pcppages_bulk(zone, pcp->batch, pcp); |
48db57f8 NP |
1195 | pcp->count -= pcp->batch; |
1196 | } | |
5f8dcc21 MG |
1197 | |
1198 | out: | |
1da177e4 | 1199 | local_irq_restore(flags); |
1da177e4 LT |
1200 | } |
1201 | ||
8dfcc9ba NP |
1202 | /* |
1203 | * split_page takes a non-compound higher-order page, and splits it into | |
1204 | * n (1<<order) sub-pages: page[0..n] | |
1205 | * Each sub-page must be freed individually. | |
1206 | * | |
1207 | * Note: this is probably too low level an operation for use in drivers. | |
1208 | * Please consult with lkml before using this in your driver. | |
1209 | */ | |
1210 | void split_page(struct page *page, unsigned int order) | |
1211 | { | |
1212 | int i; | |
1213 | ||
725d704e NP |
1214 | VM_BUG_ON(PageCompound(page)); |
1215 | VM_BUG_ON(!page_count(page)); | |
b1eeab67 VN |
1216 | |
1217 | #ifdef CONFIG_KMEMCHECK | |
1218 | /* | |
1219 | * Split shadow pages too, because free(page[0]) would | |
1220 | * otherwise free the whole shadow. | |
1221 | */ | |
1222 | if (kmemcheck_page_is_tracked(page)) | |
1223 | split_page(virt_to_page(page[0].shadow), order); | |
1224 | #endif | |
1225 | ||
7835e98b NP |
1226 | for (i = 1; i < (1 << order); i++) |
1227 | set_page_refcounted(page + i); | |
8dfcc9ba | 1228 | } |
8dfcc9ba | 1229 | |
748446bb MG |
1230 | /* |
1231 | * Similar to split_page except the page is already free. As this is only | |
1232 | * being used for migration, the migratetype of the block also changes. | |
1233 | * As this is called with interrupts disabled, the caller is responsible | |
1234 | * for calling arch_alloc_page() and kernel_map_page() after interrupts | |
1235 | * are enabled. | |
1236 | * | |
1237 | * Note: this is probably too low level an operation for use in drivers. | |
1238 | * Please consult with lkml before using this in your driver. | |
1239 | */ | |
1240 | int split_free_page(struct page *page) | |
1241 | { | |
1242 | unsigned int order; | |
1243 | unsigned long watermark; | |
1244 | struct zone *zone; | |
1245 | ||
1246 | BUG_ON(!PageBuddy(page)); | |
1247 | ||
1248 | zone = page_zone(page); | |
1249 | order = page_order(page); | |
1250 | ||
1251 | /* Obey watermarks as if the page was being allocated */ | |
1252 | watermark = low_wmark_pages(zone) + (1 << order); | |
1253 | if (!zone_watermark_ok(zone, 0, watermark, 0, 0)) | |
1254 | return 0; | |
1255 | ||
1256 | /* Remove page from free list */ | |
1257 | list_del(&page->lru); | |
1258 | zone->free_area[order].nr_free--; | |
1259 | rmv_page_order(page); | |
1260 | __mod_zone_page_state(zone, NR_FREE_PAGES, -(1UL << order)); | |
1261 | ||
1262 | /* Split into individual pages */ | |
1263 | set_page_refcounted(page); | |
1264 | split_page(page, order); | |
1265 | ||
1266 | if (order >= pageblock_order - 1) { | |
1267 | struct page *endpage = page + (1 << order) - 1; | |
1268 | for (; page < endpage; page += pageblock_nr_pages) | |
1269 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); | |
1270 | } | |
1271 | ||
1272 | return 1 << order; | |
1273 | } | |
1274 | ||
1da177e4 LT |
1275 | /* |
1276 | * Really, prep_compound_page() should be called from __rmqueue_bulk(). But | |
1277 | * we cheat by calling it from here, in the order > 0 path. Saves a branch | |
1278 | * or two. | |
1279 | */ | |
0a15c3e9 MG |
1280 | static inline |
1281 | struct page *buffered_rmqueue(struct zone *preferred_zone, | |
3dd28266 MG |
1282 | struct zone *zone, int order, gfp_t gfp_flags, |
1283 | int migratetype) | |
1da177e4 LT |
1284 | { |
1285 | unsigned long flags; | |
689bcebf | 1286 | struct page *page; |
1da177e4 LT |
1287 | int cold = !!(gfp_flags & __GFP_COLD); |
1288 | ||
689bcebf | 1289 | again: |
48db57f8 | 1290 | if (likely(order == 0)) { |
1da177e4 | 1291 | struct per_cpu_pages *pcp; |
5f8dcc21 | 1292 | struct list_head *list; |
1da177e4 | 1293 | |
1da177e4 | 1294 | local_irq_save(flags); |
99dcc3e5 CL |
1295 | pcp = &this_cpu_ptr(zone->pageset)->pcp; |
1296 | list = &pcp->lists[migratetype]; | |
5f8dcc21 | 1297 | if (list_empty(list)) { |
535131e6 | 1298 | pcp->count += rmqueue_bulk(zone, 0, |
5f8dcc21 | 1299 | pcp->batch, list, |
e084b2d9 | 1300 | migratetype, cold); |
5f8dcc21 | 1301 | if (unlikely(list_empty(list))) |
6fb332fa | 1302 | goto failed; |
535131e6 | 1303 | } |
b92a6edd | 1304 | |
5f8dcc21 MG |
1305 | if (cold) |
1306 | page = list_entry(list->prev, struct page, lru); | |
1307 | else | |
1308 | page = list_entry(list->next, struct page, lru); | |
1309 | ||
b92a6edd MG |
1310 | list_del(&page->lru); |
1311 | pcp->count--; | |
7fb1d9fc | 1312 | } else { |
dab48dab AM |
1313 | if (unlikely(gfp_flags & __GFP_NOFAIL)) { |
1314 | /* | |
1315 | * __GFP_NOFAIL is not to be used in new code. | |
1316 | * | |
1317 | * All __GFP_NOFAIL callers should be fixed so that they | |
1318 | * properly detect and handle allocation failures. | |
1319 | * | |
1320 | * We most definitely don't want callers attempting to | |
4923abf9 | 1321 | * allocate greater than order-1 page units with |
dab48dab AM |
1322 | * __GFP_NOFAIL. |
1323 | */ | |
4923abf9 | 1324 | WARN_ON_ONCE(order > 1); |
dab48dab | 1325 | } |
1da177e4 | 1326 | spin_lock_irqsave(&zone->lock, flags); |
b2a0ac88 | 1327 | page = __rmqueue(zone, order, migratetype); |
a74609fa NP |
1328 | spin_unlock(&zone->lock); |
1329 | if (!page) | |
1330 | goto failed; | |
6ccf80eb | 1331 | __mod_zone_page_state(zone, NR_FREE_PAGES, -(1 << order)); |
1da177e4 LT |
1332 | } |
1333 | ||
f8891e5e | 1334 | __count_zone_vm_events(PGALLOC, zone, 1 << order); |
18ea7e71 | 1335 | zone_statistics(preferred_zone, zone); |
a74609fa | 1336 | local_irq_restore(flags); |
1da177e4 | 1337 | |
725d704e | 1338 | VM_BUG_ON(bad_range(zone, page)); |
17cf4406 | 1339 | if (prep_new_page(page, order, gfp_flags)) |
a74609fa | 1340 | goto again; |
1da177e4 | 1341 | return page; |
a74609fa NP |
1342 | |
1343 | failed: | |
1344 | local_irq_restore(flags); | |
a74609fa | 1345 | return NULL; |
1da177e4 LT |
1346 | } |
1347 | ||
41858966 MG |
1348 | /* The ALLOC_WMARK bits are used as an index to zone->watermark */ |
1349 | #define ALLOC_WMARK_MIN WMARK_MIN | |
1350 | #define ALLOC_WMARK_LOW WMARK_LOW | |
1351 | #define ALLOC_WMARK_HIGH WMARK_HIGH | |
1352 | #define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */ | |
1353 | ||
1354 | /* Mask to get the watermark bits */ | |
1355 | #define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1) | |
1356 | ||
3148890b NP |
1357 | #define ALLOC_HARDER 0x10 /* try to alloc harder */ |
1358 | #define ALLOC_HIGH 0x20 /* __GFP_HIGH set */ | |
1359 | #define ALLOC_CPUSET 0x40 /* check for correct cpuset */ | |
7fb1d9fc | 1360 | |
933e312e AM |
1361 | #ifdef CONFIG_FAIL_PAGE_ALLOC |
1362 | ||
1363 | static struct fail_page_alloc_attr { | |
1364 | struct fault_attr attr; | |
1365 | ||
1366 | u32 ignore_gfp_highmem; | |
1367 | u32 ignore_gfp_wait; | |
54114994 | 1368 | u32 min_order; |
933e312e AM |
1369 | |
1370 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
1371 | ||
1372 | struct dentry *ignore_gfp_highmem_file; | |
1373 | struct dentry *ignore_gfp_wait_file; | |
54114994 | 1374 | struct dentry *min_order_file; |
933e312e AM |
1375 | |
1376 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ | |
1377 | ||
1378 | } fail_page_alloc = { | |
1379 | .attr = FAULT_ATTR_INITIALIZER, | |
6b1b60f4 DM |
1380 | .ignore_gfp_wait = 1, |
1381 | .ignore_gfp_highmem = 1, | |
54114994 | 1382 | .min_order = 1, |
933e312e AM |
1383 | }; |
1384 | ||
1385 | static int __init setup_fail_page_alloc(char *str) | |
1386 | { | |
1387 | return setup_fault_attr(&fail_page_alloc.attr, str); | |
1388 | } | |
1389 | __setup("fail_page_alloc=", setup_fail_page_alloc); | |
1390 | ||
1391 | static int should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) | |
1392 | { | |
54114994 AM |
1393 | if (order < fail_page_alloc.min_order) |
1394 | return 0; | |
933e312e AM |
1395 | if (gfp_mask & __GFP_NOFAIL) |
1396 | return 0; | |
1397 | if (fail_page_alloc.ignore_gfp_highmem && (gfp_mask & __GFP_HIGHMEM)) | |
1398 | return 0; | |
1399 | if (fail_page_alloc.ignore_gfp_wait && (gfp_mask & __GFP_WAIT)) | |
1400 | return 0; | |
1401 | ||
1402 | return should_fail(&fail_page_alloc.attr, 1 << order); | |
1403 | } | |
1404 | ||
1405 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
1406 | ||
1407 | static int __init fail_page_alloc_debugfs(void) | |
1408 | { | |
1409 | mode_t mode = S_IFREG | S_IRUSR | S_IWUSR; | |
1410 | struct dentry *dir; | |
1411 | int err; | |
1412 | ||
1413 | err = init_fault_attr_dentries(&fail_page_alloc.attr, | |
1414 | "fail_page_alloc"); | |
1415 | if (err) | |
1416 | return err; | |
1417 | dir = fail_page_alloc.attr.dentries.dir; | |
1418 | ||
1419 | fail_page_alloc.ignore_gfp_wait_file = | |
1420 | debugfs_create_bool("ignore-gfp-wait", mode, dir, | |
1421 | &fail_page_alloc.ignore_gfp_wait); | |
1422 | ||
1423 | fail_page_alloc.ignore_gfp_highmem_file = | |
1424 | debugfs_create_bool("ignore-gfp-highmem", mode, dir, | |
1425 | &fail_page_alloc.ignore_gfp_highmem); | |
54114994 AM |
1426 | fail_page_alloc.min_order_file = |
1427 | debugfs_create_u32("min-order", mode, dir, | |
1428 | &fail_page_alloc.min_order); | |
933e312e AM |
1429 | |
1430 | if (!fail_page_alloc.ignore_gfp_wait_file || | |
54114994 AM |
1431 | !fail_page_alloc.ignore_gfp_highmem_file || |
1432 | !fail_page_alloc.min_order_file) { | |
933e312e AM |
1433 | err = -ENOMEM; |
1434 | debugfs_remove(fail_page_alloc.ignore_gfp_wait_file); | |
1435 | debugfs_remove(fail_page_alloc.ignore_gfp_highmem_file); | |
54114994 | 1436 | debugfs_remove(fail_page_alloc.min_order_file); |
933e312e AM |
1437 | cleanup_fault_attr_dentries(&fail_page_alloc.attr); |
1438 | } | |
1439 | ||
1440 | return err; | |
1441 | } | |
1442 | ||
1443 | late_initcall(fail_page_alloc_debugfs); | |
1444 | ||
1445 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ | |
1446 | ||
1447 | #else /* CONFIG_FAIL_PAGE_ALLOC */ | |
1448 | ||
1449 | static inline int should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) | |
1450 | { | |
1451 | return 0; | |
1452 | } | |
1453 | ||
1454 | #endif /* CONFIG_FAIL_PAGE_ALLOC */ | |
1455 | ||
1da177e4 LT |
1456 | /* |
1457 | * Return 1 if free pages are above 'mark'. This takes into account the order | |
1458 | * of the allocation. | |
1459 | */ | |
1460 | int zone_watermark_ok(struct zone *z, int order, unsigned long mark, | |
7fb1d9fc | 1461 | int classzone_idx, int alloc_flags) |
1da177e4 LT |
1462 | { |
1463 | /* free_pages my go negative - that's OK */ | |
d23ad423 | 1464 | long min = mark; |
aa454840 | 1465 | long free_pages = zone_nr_free_pages(z) - (1 << order) + 1; |
1da177e4 LT |
1466 | int o; |
1467 | ||
7fb1d9fc | 1468 | if (alloc_flags & ALLOC_HIGH) |
1da177e4 | 1469 | min -= min / 2; |
7fb1d9fc | 1470 | if (alloc_flags & ALLOC_HARDER) |
1da177e4 LT |
1471 | min -= min / 4; |
1472 | ||
1473 | if (free_pages <= min + z->lowmem_reserve[classzone_idx]) | |
1474 | return 0; | |
1475 | for (o = 0; o < order; o++) { | |
1476 | /* At the next order, this order's pages become unavailable */ | |
1477 | free_pages -= z->free_area[o].nr_free << o; | |
1478 | ||
1479 | /* Require fewer higher order pages to be free */ | |
1480 | min >>= 1; | |
1481 | ||
1482 | if (free_pages <= min) | |
1483 | return 0; | |
1484 | } | |
1485 | return 1; | |
1486 | } | |
1487 | ||
9276b1bc PJ |
1488 | #ifdef CONFIG_NUMA |
1489 | /* | |
1490 | * zlc_setup - Setup for "zonelist cache". Uses cached zone data to | |
1491 | * skip over zones that are not allowed by the cpuset, or that have | |
1492 | * been recently (in last second) found to be nearly full. See further | |
1493 | * comments in mmzone.h. Reduces cache footprint of zonelist scans | |
183ff22b | 1494 | * that have to skip over a lot of full or unallowed zones. |
9276b1bc PJ |
1495 | * |
1496 | * If the zonelist cache is present in the passed in zonelist, then | |
1497 | * returns a pointer to the allowed node mask (either the current | |
37b07e41 | 1498 | * tasks mems_allowed, or node_states[N_HIGH_MEMORY].) |
9276b1bc PJ |
1499 | * |
1500 | * If the zonelist cache is not available for this zonelist, does | |
1501 | * nothing and returns NULL. | |
1502 | * | |
1503 | * If the fullzones BITMAP in the zonelist cache is stale (more than | |
1504 | * a second since last zap'd) then we zap it out (clear its bits.) | |
1505 | * | |
1506 | * We hold off even calling zlc_setup, until after we've checked the | |
1507 | * first zone in the zonelist, on the theory that most allocations will | |
1508 | * be satisfied from that first zone, so best to examine that zone as | |
1509 | * quickly as we can. | |
1510 | */ | |
1511 | static nodemask_t *zlc_setup(struct zonelist *zonelist, int alloc_flags) | |
1512 | { | |
1513 | struct zonelist_cache *zlc; /* cached zonelist speedup info */ | |
1514 | nodemask_t *allowednodes; /* zonelist_cache approximation */ | |
1515 | ||
1516 | zlc = zonelist->zlcache_ptr; | |
1517 | if (!zlc) | |
1518 | return NULL; | |
1519 | ||
f05111f5 | 1520 | if (time_after(jiffies, zlc->last_full_zap + HZ)) { |
9276b1bc PJ |
1521 | bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST); |
1522 | zlc->last_full_zap = jiffies; | |
1523 | } | |
1524 | ||
1525 | allowednodes = !in_interrupt() && (alloc_flags & ALLOC_CPUSET) ? | |
1526 | &cpuset_current_mems_allowed : | |
37b07e41 | 1527 | &node_states[N_HIGH_MEMORY]; |
9276b1bc PJ |
1528 | return allowednodes; |
1529 | } | |
1530 | ||
1531 | /* | |
1532 | * Given 'z' scanning a zonelist, run a couple of quick checks to see | |
1533 | * if it is worth looking at further for free memory: | |
1534 | * 1) Check that the zone isn't thought to be full (doesn't have its | |
1535 | * bit set in the zonelist_cache fullzones BITMAP). | |
1536 | * 2) Check that the zones node (obtained from the zonelist_cache | |
1537 | * z_to_n[] mapping) is allowed in the passed in allowednodes mask. | |
1538 | * Return true (non-zero) if zone is worth looking at further, or | |
1539 | * else return false (zero) if it is not. | |
1540 | * | |
1541 | * This check -ignores- the distinction between various watermarks, | |
1542 | * such as GFP_HIGH, GFP_ATOMIC, PF_MEMALLOC, ... If a zone is | |
1543 | * found to be full for any variation of these watermarks, it will | |
1544 | * be considered full for up to one second by all requests, unless | |
1545 | * we are so low on memory on all allowed nodes that we are forced | |
1546 | * into the second scan of the zonelist. | |
1547 | * | |
1548 | * In the second scan we ignore this zonelist cache and exactly | |
1549 | * apply the watermarks to all zones, even it is slower to do so. | |
1550 | * We are low on memory in the second scan, and should leave no stone | |
1551 | * unturned looking for a free page. | |
1552 | */ | |
dd1a239f | 1553 | static int zlc_zone_worth_trying(struct zonelist *zonelist, struct zoneref *z, |
9276b1bc PJ |
1554 | nodemask_t *allowednodes) |
1555 | { | |
1556 | struct zonelist_cache *zlc; /* cached zonelist speedup info */ | |
1557 | int i; /* index of *z in zonelist zones */ | |
1558 | int n; /* node that zone *z is on */ | |
1559 | ||
1560 | zlc = zonelist->zlcache_ptr; | |
1561 | if (!zlc) | |
1562 | return 1; | |
1563 | ||
dd1a239f | 1564 | i = z - zonelist->_zonerefs; |
9276b1bc PJ |
1565 | n = zlc->z_to_n[i]; |
1566 | ||
1567 | /* This zone is worth trying if it is allowed but not full */ | |
1568 | return node_isset(n, *allowednodes) && !test_bit(i, zlc->fullzones); | |
1569 | } | |
1570 | ||
1571 | /* | |
1572 | * Given 'z' scanning a zonelist, set the corresponding bit in | |
1573 | * zlc->fullzones, so that subsequent attempts to allocate a page | |
1574 | * from that zone don't waste time re-examining it. | |
1575 | */ | |
dd1a239f | 1576 | static void zlc_mark_zone_full(struct zonelist *zonelist, struct zoneref *z) |
9276b1bc PJ |
1577 | { |
1578 | struct zonelist_cache *zlc; /* cached zonelist speedup info */ | |
1579 | int i; /* index of *z in zonelist zones */ | |
1580 | ||
1581 | zlc = zonelist->zlcache_ptr; | |
1582 | if (!zlc) | |
1583 | return; | |
1584 | ||
dd1a239f | 1585 | i = z - zonelist->_zonerefs; |
9276b1bc PJ |
1586 | |
1587 | set_bit(i, zlc->fullzones); | |
1588 | } | |
1589 | ||
1590 | #else /* CONFIG_NUMA */ | |
1591 | ||
1592 | static nodemask_t *zlc_setup(struct zonelist *zonelist, int alloc_flags) | |
1593 | { | |
1594 | return NULL; | |
1595 | } | |
1596 | ||
dd1a239f | 1597 | static int zlc_zone_worth_trying(struct zonelist *zonelist, struct zoneref *z, |
9276b1bc PJ |
1598 | nodemask_t *allowednodes) |
1599 | { | |
1600 | return 1; | |
1601 | } | |
1602 | ||
dd1a239f | 1603 | static void zlc_mark_zone_full(struct zonelist *zonelist, struct zoneref *z) |
9276b1bc PJ |
1604 | { |
1605 | } | |
1606 | #endif /* CONFIG_NUMA */ | |
1607 | ||
7fb1d9fc | 1608 | /* |
0798e519 | 1609 | * get_page_from_freelist goes through the zonelist trying to allocate |
7fb1d9fc RS |
1610 | * a page. |
1611 | */ | |
1612 | static struct page * | |
19770b32 | 1613 | get_page_from_freelist(gfp_t gfp_mask, nodemask_t *nodemask, unsigned int order, |
5117f45d | 1614 | struct zonelist *zonelist, int high_zoneidx, int alloc_flags, |
3dd28266 | 1615 | struct zone *preferred_zone, int migratetype) |
753ee728 | 1616 | { |
dd1a239f | 1617 | struct zoneref *z; |
7fb1d9fc | 1618 | struct page *page = NULL; |
54a6eb5c | 1619 | int classzone_idx; |
5117f45d | 1620 | struct zone *zone; |
9276b1bc PJ |
1621 | nodemask_t *allowednodes = NULL;/* zonelist_cache approximation */ |
1622 | int zlc_active = 0; /* set if using zonelist_cache */ | |
1623 | int did_zlc_setup = 0; /* just call zlc_setup() one time */ | |
54a6eb5c | 1624 | |
19770b32 | 1625 | classzone_idx = zone_idx(preferred_zone); |
9276b1bc | 1626 | zonelist_scan: |
7fb1d9fc | 1627 | /* |
9276b1bc | 1628 | * Scan zonelist, looking for a zone with enough free. |
7fb1d9fc RS |
1629 | * See also cpuset_zone_allowed() comment in kernel/cpuset.c. |
1630 | */ | |
19770b32 MG |
1631 | for_each_zone_zonelist_nodemask(zone, z, zonelist, |
1632 | high_zoneidx, nodemask) { | |
9276b1bc PJ |
1633 | if (NUMA_BUILD && zlc_active && |
1634 | !zlc_zone_worth_trying(zonelist, z, allowednodes)) | |
1635 | continue; | |
7fb1d9fc | 1636 | if ((alloc_flags & ALLOC_CPUSET) && |
02a0e53d | 1637 | !cpuset_zone_allowed_softwall(zone, gfp_mask)) |
9276b1bc | 1638 | goto try_next_zone; |
7fb1d9fc | 1639 | |
41858966 | 1640 | BUILD_BUG_ON(ALLOC_NO_WATERMARKS < NR_WMARK); |
7fb1d9fc | 1641 | if (!(alloc_flags & ALLOC_NO_WATERMARKS)) { |
3148890b | 1642 | unsigned long mark; |
fa5e084e MG |
1643 | int ret; |
1644 | ||
41858966 | 1645 | mark = zone->watermark[alloc_flags & ALLOC_WMARK_MASK]; |
fa5e084e MG |
1646 | if (zone_watermark_ok(zone, order, mark, |
1647 | classzone_idx, alloc_flags)) | |
1648 | goto try_this_zone; | |
1649 | ||
1650 | if (zone_reclaim_mode == 0) | |
1651 | goto this_zone_full; | |
1652 | ||
1653 | ret = zone_reclaim(zone, gfp_mask, order); | |
1654 | switch (ret) { | |
1655 | case ZONE_RECLAIM_NOSCAN: | |
1656 | /* did not scan */ | |
1657 | goto try_next_zone; | |
1658 | case ZONE_RECLAIM_FULL: | |
1659 | /* scanned but unreclaimable */ | |
1660 | goto this_zone_full; | |
1661 | default: | |
1662 | /* did we reclaim enough */ | |
1663 | if (!zone_watermark_ok(zone, order, mark, | |
1664 | classzone_idx, alloc_flags)) | |
9276b1bc | 1665 | goto this_zone_full; |
0798e519 | 1666 | } |
7fb1d9fc RS |
1667 | } |
1668 | ||
fa5e084e | 1669 | try_this_zone: |
3dd28266 MG |
1670 | page = buffered_rmqueue(preferred_zone, zone, order, |
1671 | gfp_mask, migratetype); | |
0798e519 | 1672 | if (page) |
7fb1d9fc | 1673 | break; |
9276b1bc PJ |
1674 | this_zone_full: |
1675 | if (NUMA_BUILD) | |
1676 | zlc_mark_zone_full(zonelist, z); | |
1677 | try_next_zone: | |
62bc62a8 | 1678 | if (NUMA_BUILD && !did_zlc_setup && nr_online_nodes > 1) { |
d395b734 MG |
1679 | /* |
1680 | * we do zlc_setup after the first zone is tried but only | |
1681 | * if there are multiple nodes make it worthwhile | |
1682 | */ | |
9276b1bc PJ |
1683 | allowednodes = zlc_setup(zonelist, alloc_flags); |
1684 | zlc_active = 1; | |
1685 | did_zlc_setup = 1; | |
1686 | } | |
54a6eb5c | 1687 | } |
9276b1bc PJ |
1688 | |
1689 | if (unlikely(NUMA_BUILD && page == NULL && zlc_active)) { | |
1690 | /* Disable zlc cache for second zonelist scan */ | |
1691 | zlc_active = 0; | |
1692 | goto zonelist_scan; | |
1693 | } | |
7fb1d9fc | 1694 | return page; |
753ee728 MH |
1695 | } |
1696 | ||
11e33f6a MG |
1697 | static inline int |
1698 | should_alloc_retry(gfp_t gfp_mask, unsigned int order, | |
1699 | unsigned long pages_reclaimed) | |
1da177e4 | 1700 | { |
11e33f6a MG |
1701 | /* Do not loop if specifically requested */ |
1702 | if (gfp_mask & __GFP_NORETRY) | |
1703 | return 0; | |
1da177e4 | 1704 | |
11e33f6a MG |
1705 | /* |
1706 | * In this implementation, order <= PAGE_ALLOC_COSTLY_ORDER | |
1707 | * means __GFP_NOFAIL, but that may not be true in other | |
1708 | * implementations. | |
1709 | */ | |
1710 | if (order <= PAGE_ALLOC_COSTLY_ORDER) | |
1711 | return 1; | |
1712 | ||
1713 | /* | |
1714 | * For order > PAGE_ALLOC_COSTLY_ORDER, if __GFP_REPEAT is | |
1715 | * specified, then we retry until we no longer reclaim any pages | |
1716 | * (above), or we've reclaimed an order of pages at least as | |
1717 | * large as the allocation's order. In both cases, if the | |
1718 | * allocation still fails, we stop retrying. | |
1719 | */ | |
1720 | if (gfp_mask & __GFP_REPEAT && pages_reclaimed < (1 << order)) | |
1721 | return 1; | |
cf40bd16 | 1722 | |
11e33f6a MG |
1723 | /* |
1724 | * Don't let big-order allocations loop unless the caller | |
1725 | * explicitly requests that. | |
1726 | */ | |
1727 | if (gfp_mask & __GFP_NOFAIL) | |
1728 | return 1; | |
1da177e4 | 1729 | |
11e33f6a MG |
1730 | return 0; |
1731 | } | |
933e312e | 1732 | |
11e33f6a MG |
1733 | static inline struct page * |
1734 | __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order, | |
1735 | struct zonelist *zonelist, enum zone_type high_zoneidx, | |
3dd28266 MG |
1736 | nodemask_t *nodemask, struct zone *preferred_zone, |
1737 | int migratetype) | |
11e33f6a MG |
1738 | { |
1739 | struct page *page; | |
1740 | ||
1741 | /* Acquire the OOM killer lock for the zones in zonelist */ | |
ff321fea | 1742 | if (!try_set_zonelist_oom(zonelist, gfp_mask)) { |
11e33f6a | 1743 | schedule_timeout_uninterruptible(1); |
1da177e4 LT |
1744 | return NULL; |
1745 | } | |
6b1de916 | 1746 | |
11e33f6a MG |
1747 | /* |
1748 | * Go through the zonelist yet one more time, keep very high watermark | |
1749 | * here, this is only to catch a parallel oom killing, we must fail if | |
1750 | * we're still under heavy pressure. | |
1751 | */ | |
1752 | page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, | |
1753 | order, zonelist, high_zoneidx, | |
5117f45d | 1754 | ALLOC_WMARK_HIGH|ALLOC_CPUSET, |
3dd28266 | 1755 | preferred_zone, migratetype); |
7fb1d9fc | 1756 | if (page) |
11e33f6a MG |
1757 | goto out; |
1758 | ||
4365a567 KH |
1759 | if (!(gfp_mask & __GFP_NOFAIL)) { |
1760 | /* The OOM killer will not help higher order allocs */ | |
1761 | if (order > PAGE_ALLOC_COSTLY_ORDER) | |
1762 | goto out; | |
03668b3c DR |
1763 | /* The OOM killer does not needlessly kill tasks for lowmem */ |
1764 | if (high_zoneidx < ZONE_NORMAL) | |
1765 | goto out; | |
4365a567 KH |
1766 | /* |
1767 | * GFP_THISNODE contains __GFP_NORETRY and we never hit this. | |
1768 | * Sanity check for bare calls of __GFP_THISNODE, not real OOM. | |
1769 | * The caller should handle page allocation failure by itself if | |
1770 | * it specifies __GFP_THISNODE. | |
1771 | * Note: Hugepage uses it but will hit PAGE_ALLOC_COSTLY_ORDER. | |
1772 | */ | |
1773 | if (gfp_mask & __GFP_THISNODE) | |
1774 | goto out; | |
1775 | } | |
11e33f6a | 1776 | /* Exhausted what can be done so it's blamo time */ |
4365a567 | 1777 | out_of_memory(zonelist, gfp_mask, order, nodemask); |
11e33f6a MG |
1778 | |
1779 | out: | |
1780 | clear_zonelist_oom(zonelist, gfp_mask); | |
1781 | return page; | |
1782 | } | |
1783 | ||
56de7263 MG |
1784 | #ifdef CONFIG_COMPACTION |
1785 | /* Try memory compaction for high-order allocations before reclaim */ | |
1786 | static struct page * | |
1787 | __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, | |
1788 | struct zonelist *zonelist, enum zone_type high_zoneidx, | |
1789 | nodemask_t *nodemask, int alloc_flags, struct zone *preferred_zone, | |
1790 | int migratetype, unsigned long *did_some_progress) | |
1791 | { | |
1792 | struct page *page; | |
1793 | ||
4f92e258 | 1794 | if (!order || compaction_deferred(preferred_zone)) |
56de7263 MG |
1795 | return NULL; |
1796 | ||
1797 | *did_some_progress = try_to_compact_pages(zonelist, order, gfp_mask, | |
1798 | nodemask); | |
1799 | if (*did_some_progress != COMPACT_SKIPPED) { | |
1800 | ||
1801 | /* Page migration frees to the PCP lists but we want merging */ | |
1802 | drain_pages(get_cpu()); | |
1803 | put_cpu(); | |
1804 | ||
1805 | page = get_page_from_freelist(gfp_mask, nodemask, | |
1806 | order, zonelist, high_zoneidx, | |
1807 | alloc_flags, preferred_zone, | |
1808 | migratetype); | |
1809 | if (page) { | |
4f92e258 MG |
1810 | preferred_zone->compact_considered = 0; |
1811 | preferred_zone->compact_defer_shift = 0; | |
56de7263 MG |
1812 | count_vm_event(COMPACTSUCCESS); |
1813 | return page; | |
1814 | } | |
1815 | ||
1816 | /* | |
1817 | * It's bad if compaction run occurs and fails. | |
1818 | * The most likely reason is that pages exist, | |
1819 | * but not enough to satisfy watermarks. | |
1820 | */ | |
1821 | count_vm_event(COMPACTFAIL); | |
4f92e258 | 1822 | defer_compaction(preferred_zone); |
56de7263 MG |
1823 | |
1824 | cond_resched(); | |
1825 | } | |
1826 | ||
1827 | return NULL; | |
1828 | } | |
1829 | #else | |
1830 | static inline struct page * | |
1831 | __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, | |
1832 | struct zonelist *zonelist, enum zone_type high_zoneidx, | |
1833 | nodemask_t *nodemask, int alloc_flags, struct zone *preferred_zone, | |
1834 | int migratetype, unsigned long *did_some_progress) | |
1835 | { | |
1836 | return NULL; | |
1837 | } | |
1838 | #endif /* CONFIG_COMPACTION */ | |
1839 | ||
11e33f6a MG |
1840 | /* The really slow allocator path where we enter direct reclaim */ |
1841 | static inline struct page * | |
1842 | __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order, | |
1843 | struct zonelist *zonelist, enum zone_type high_zoneidx, | |
5117f45d | 1844 | nodemask_t *nodemask, int alloc_flags, struct zone *preferred_zone, |
3dd28266 | 1845 | int migratetype, unsigned long *did_some_progress) |
11e33f6a MG |
1846 | { |
1847 | struct page *page = NULL; | |
1848 | struct reclaim_state reclaim_state; | |
1849 | struct task_struct *p = current; | |
9ee493ce | 1850 | bool drained = false; |
11e33f6a MG |
1851 | |
1852 | cond_resched(); | |
1853 | ||
1854 | /* We now go into synchronous reclaim */ | |
1855 | cpuset_memory_pressure_bump(); | |
11e33f6a MG |
1856 | p->flags |= PF_MEMALLOC; |
1857 | lockdep_set_current_reclaim_state(gfp_mask); | |
1858 | reclaim_state.reclaimed_slab = 0; | |
1859 | p->reclaim_state = &reclaim_state; | |
1860 | ||
1861 | *did_some_progress = try_to_free_pages(zonelist, order, gfp_mask, nodemask); | |
1862 | ||
1863 | p->reclaim_state = NULL; | |
1864 | lockdep_clear_current_reclaim_state(); | |
1865 | p->flags &= ~PF_MEMALLOC; | |
1866 | ||
1867 | cond_resched(); | |
1868 | ||
9ee493ce MG |
1869 | if (unlikely(!(*did_some_progress))) |
1870 | return NULL; | |
11e33f6a | 1871 | |
9ee493ce MG |
1872 | retry: |
1873 | page = get_page_from_freelist(gfp_mask, nodemask, order, | |
5117f45d | 1874 | zonelist, high_zoneidx, |
3dd28266 MG |
1875 | alloc_flags, preferred_zone, |
1876 | migratetype); | |
9ee493ce MG |
1877 | |
1878 | /* | |
1879 | * If an allocation failed after direct reclaim, it could be because | |
1880 | * pages are pinned on the per-cpu lists. Drain them and try again | |
1881 | */ | |
1882 | if (!page && !drained) { | |
1883 | drain_all_pages(); | |
1884 | drained = true; | |
1885 | goto retry; | |
1886 | } | |
1887 | ||
11e33f6a MG |
1888 | return page; |
1889 | } | |
1890 | ||
1da177e4 | 1891 | /* |
11e33f6a MG |
1892 | * This is called in the allocator slow-path if the allocation request is of |
1893 | * sufficient urgency to ignore watermarks and take other desperate measures | |
1da177e4 | 1894 | */ |
11e33f6a MG |
1895 | static inline struct page * |
1896 | __alloc_pages_high_priority(gfp_t gfp_mask, unsigned int order, | |
1897 | struct zonelist *zonelist, enum zone_type high_zoneidx, | |
3dd28266 MG |
1898 | nodemask_t *nodemask, struct zone *preferred_zone, |
1899 | int migratetype) | |
11e33f6a MG |
1900 | { |
1901 | struct page *page; | |
1902 | ||
1903 | do { | |
1904 | page = get_page_from_freelist(gfp_mask, nodemask, order, | |
5117f45d | 1905 | zonelist, high_zoneidx, ALLOC_NO_WATERMARKS, |
3dd28266 | 1906 | preferred_zone, migratetype); |
11e33f6a MG |
1907 | |
1908 | if (!page && gfp_mask & __GFP_NOFAIL) | |
8aa7e847 | 1909 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
11e33f6a MG |
1910 | } while (!page && (gfp_mask & __GFP_NOFAIL)); |
1911 | ||
1912 | return page; | |
1913 | } | |
1914 | ||
1915 | static inline | |
1916 | void wake_all_kswapd(unsigned int order, struct zonelist *zonelist, | |
1917 | enum zone_type high_zoneidx) | |
1da177e4 | 1918 | { |
dd1a239f MG |
1919 | struct zoneref *z; |
1920 | struct zone *zone; | |
1da177e4 | 1921 | |
11e33f6a MG |
1922 | for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) |
1923 | wakeup_kswapd(zone, order); | |
1924 | } | |
cf40bd16 | 1925 | |
341ce06f PZ |
1926 | static inline int |
1927 | gfp_to_alloc_flags(gfp_t gfp_mask) | |
1928 | { | |
1929 | struct task_struct *p = current; | |
1930 | int alloc_flags = ALLOC_WMARK_MIN | ALLOC_CPUSET; | |
1931 | const gfp_t wait = gfp_mask & __GFP_WAIT; | |
1da177e4 | 1932 | |
a56f57ff MG |
1933 | /* __GFP_HIGH is assumed to be the same as ALLOC_HIGH to save a branch. */ |
1934 | BUILD_BUG_ON(__GFP_HIGH != ALLOC_HIGH); | |
933e312e | 1935 | |
341ce06f PZ |
1936 | /* |
1937 | * The caller may dip into page reserves a bit more if the caller | |
1938 | * cannot run direct reclaim, or if the caller has realtime scheduling | |
1939 | * policy or is asking for __GFP_HIGH memory. GFP_ATOMIC requests will | |
1940 | * set both ALLOC_HARDER (!wait) and ALLOC_HIGH (__GFP_HIGH). | |
1941 | */ | |
a56f57ff | 1942 | alloc_flags |= (gfp_mask & __GFP_HIGH); |
1da177e4 | 1943 | |
341ce06f PZ |
1944 | if (!wait) { |
1945 | alloc_flags |= ALLOC_HARDER; | |
523b9458 | 1946 | /* |
341ce06f PZ |
1947 | * Ignore cpuset if GFP_ATOMIC (!wait) rather than fail alloc. |
1948 | * See also cpuset_zone_allowed() comment in kernel/cpuset.c. | |
523b9458 | 1949 | */ |
341ce06f | 1950 | alloc_flags &= ~ALLOC_CPUSET; |
9d0ed60f | 1951 | } else if (unlikely(rt_task(p)) && !in_interrupt()) |
341ce06f PZ |
1952 | alloc_flags |= ALLOC_HARDER; |
1953 | ||
1954 | if (likely(!(gfp_mask & __GFP_NOMEMALLOC))) { | |
1955 | if (!in_interrupt() && | |
1956 | ((p->flags & PF_MEMALLOC) || | |
1957 | unlikely(test_thread_flag(TIF_MEMDIE)))) | |
1958 | alloc_flags |= ALLOC_NO_WATERMARKS; | |
1da177e4 | 1959 | } |
6b1de916 | 1960 | |
341ce06f PZ |
1961 | return alloc_flags; |
1962 | } | |
1963 | ||
11e33f6a MG |
1964 | static inline struct page * |
1965 | __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, | |
1966 | struct zonelist *zonelist, enum zone_type high_zoneidx, | |
3dd28266 MG |
1967 | nodemask_t *nodemask, struct zone *preferred_zone, |
1968 | int migratetype) | |
11e33f6a MG |
1969 | { |
1970 | const gfp_t wait = gfp_mask & __GFP_WAIT; | |
1971 | struct page *page = NULL; | |
1972 | int alloc_flags; | |
1973 | unsigned long pages_reclaimed = 0; | |
1974 | unsigned long did_some_progress; | |
1975 | struct task_struct *p = current; | |
1da177e4 | 1976 | |
72807a74 MG |
1977 | /* |
1978 | * In the slowpath, we sanity check order to avoid ever trying to | |
1979 | * reclaim >= MAX_ORDER areas which will never succeed. Callers may | |
1980 | * be using allocators in order of preference for an area that is | |
1981 | * too large. | |
1982 | */ | |
1fc28b70 MG |
1983 | if (order >= MAX_ORDER) { |
1984 | WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN)); | |
72807a74 | 1985 | return NULL; |
1fc28b70 | 1986 | } |
1da177e4 | 1987 | |
952f3b51 CL |
1988 | /* |
1989 | * GFP_THISNODE (meaning __GFP_THISNODE, __GFP_NORETRY and | |
1990 | * __GFP_NOWARN set) should not cause reclaim since the subsystem | |
1991 | * (f.e. slab) using GFP_THISNODE may choose to trigger reclaim | |
1992 | * using a larger set of nodes after it has established that the | |
1993 | * allowed per node queues are empty and that nodes are | |
1994 | * over allocated. | |
1995 | */ | |
1996 | if (NUMA_BUILD && (gfp_mask & GFP_THISNODE) == GFP_THISNODE) | |
1997 | goto nopage; | |
1998 | ||
cc4a6851 | 1999 | restart: |
11e33f6a | 2000 | wake_all_kswapd(order, zonelist, high_zoneidx); |
1da177e4 | 2001 | |
9bf2229f | 2002 | /* |
7fb1d9fc RS |
2003 | * OK, we're below the kswapd watermark and have kicked background |
2004 | * reclaim. Now things get more complex, so set up alloc_flags according | |
2005 | * to how we want to proceed. | |
9bf2229f | 2006 | */ |
341ce06f | 2007 | alloc_flags = gfp_to_alloc_flags(gfp_mask); |
1da177e4 | 2008 | |
341ce06f | 2009 | /* This is the last chance, in general, before the goto nopage. */ |
19770b32 | 2010 | page = get_page_from_freelist(gfp_mask, nodemask, order, zonelist, |
341ce06f PZ |
2011 | high_zoneidx, alloc_flags & ~ALLOC_NO_WATERMARKS, |
2012 | preferred_zone, migratetype); | |
7fb1d9fc RS |
2013 | if (page) |
2014 | goto got_pg; | |
1da177e4 | 2015 | |
b43a57bb | 2016 | rebalance: |
11e33f6a | 2017 | /* Allocate without watermarks if the context allows */ |
341ce06f PZ |
2018 | if (alloc_flags & ALLOC_NO_WATERMARKS) { |
2019 | page = __alloc_pages_high_priority(gfp_mask, order, | |
2020 | zonelist, high_zoneidx, nodemask, | |
2021 | preferred_zone, migratetype); | |
2022 | if (page) | |
2023 | goto got_pg; | |
1da177e4 LT |
2024 | } |
2025 | ||
2026 | /* Atomic allocations - we can't balance anything */ | |
2027 | if (!wait) | |
2028 | goto nopage; | |
2029 | ||
341ce06f PZ |
2030 | /* Avoid recursion of direct reclaim */ |
2031 | if (p->flags & PF_MEMALLOC) | |
2032 | goto nopage; | |
2033 | ||
6583bb64 DR |
2034 | /* Avoid allocations with no watermarks from looping endlessly */ |
2035 | if (test_thread_flag(TIF_MEMDIE) && !(gfp_mask & __GFP_NOFAIL)) | |
2036 | goto nopage; | |
2037 | ||
56de7263 MG |
2038 | /* Try direct compaction */ |
2039 | page = __alloc_pages_direct_compact(gfp_mask, order, | |
2040 | zonelist, high_zoneidx, | |
2041 | nodemask, | |
2042 | alloc_flags, preferred_zone, | |
2043 | migratetype, &did_some_progress); | |
2044 | if (page) | |
2045 | goto got_pg; | |
2046 | ||
11e33f6a MG |
2047 | /* Try direct reclaim and then allocating */ |
2048 | page = __alloc_pages_direct_reclaim(gfp_mask, order, | |
2049 | zonelist, high_zoneidx, | |
2050 | nodemask, | |
5117f45d | 2051 | alloc_flags, preferred_zone, |
3dd28266 | 2052 | migratetype, &did_some_progress); |
11e33f6a MG |
2053 | if (page) |
2054 | goto got_pg; | |
1da177e4 | 2055 | |
e33c3b5e | 2056 | /* |
11e33f6a MG |
2057 | * If we failed to make any progress reclaiming, then we are |
2058 | * running out of options and have to consider going OOM | |
e33c3b5e | 2059 | */ |
11e33f6a MG |
2060 | if (!did_some_progress) { |
2061 | if ((gfp_mask & __GFP_FS) && !(gfp_mask & __GFP_NORETRY)) { | |
7f33d49a RW |
2062 | if (oom_killer_disabled) |
2063 | goto nopage; | |
11e33f6a MG |
2064 | page = __alloc_pages_may_oom(gfp_mask, order, |
2065 | zonelist, high_zoneidx, | |
3dd28266 MG |
2066 | nodemask, preferred_zone, |
2067 | migratetype); | |
11e33f6a MG |
2068 | if (page) |
2069 | goto got_pg; | |
1da177e4 | 2070 | |
03668b3c DR |
2071 | if (!(gfp_mask & __GFP_NOFAIL)) { |
2072 | /* | |
2073 | * The oom killer is not called for high-order | |
2074 | * allocations that may fail, so if no progress | |
2075 | * is being made, there are no other options and | |
2076 | * retrying is unlikely to help. | |
2077 | */ | |
2078 | if (order > PAGE_ALLOC_COSTLY_ORDER) | |
2079 | goto nopage; | |
2080 | /* | |
2081 | * The oom killer is not called for lowmem | |
2082 | * allocations to prevent needlessly killing | |
2083 | * innocent tasks. | |
2084 | */ | |
2085 | if (high_zoneidx < ZONE_NORMAL) | |
2086 | goto nopage; | |
2087 | } | |
e2c55dc8 | 2088 | |
ff0ceb9d DR |
2089 | goto restart; |
2090 | } | |
1da177e4 LT |
2091 | } |
2092 | ||
11e33f6a | 2093 | /* Check if we should retry the allocation */ |
a41f24ea | 2094 | pages_reclaimed += did_some_progress; |
11e33f6a MG |
2095 | if (should_alloc_retry(gfp_mask, order, pages_reclaimed)) { |
2096 | /* Wait for some write requests to complete then retry */ | |
8aa7e847 | 2097 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
1da177e4 LT |
2098 | goto rebalance; |
2099 | } | |
2100 | ||
2101 | nopage: | |
2102 | if (!(gfp_mask & __GFP_NOWARN) && printk_ratelimit()) { | |
2103 | printk(KERN_WARNING "%s: page allocation failure." | |
2104 | " order:%d, mode:0x%x\n", | |
2105 | p->comm, order, gfp_mask); | |
2106 | dump_stack(); | |
578c2fd6 | 2107 | show_mem(); |
1da177e4 | 2108 | } |
b1eeab67 | 2109 | return page; |
1da177e4 | 2110 | got_pg: |
b1eeab67 VN |
2111 | if (kmemcheck_enabled) |
2112 | kmemcheck_pagealloc_alloc(page, order, gfp_mask); | |
1da177e4 | 2113 | return page; |
11e33f6a | 2114 | |
1da177e4 | 2115 | } |
11e33f6a MG |
2116 | |
2117 | /* | |
2118 | * This is the 'heart' of the zoned buddy allocator. | |
2119 | */ | |
2120 | struct page * | |
2121 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, | |
2122 | struct zonelist *zonelist, nodemask_t *nodemask) | |
2123 | { | |
2124 | enum zone_type high_zoneidx = gfp_zone(gfp_mask); | |
5117f45d | 2125 | struct zone *preferred_zone; |
11e33f6a | 2126 | struct page *page; |
3dd28266 | 2127 | int migratetype = allocflags_to_migratetype(gfp_mask); |
11e33f6a | 2128 | |
dcce284a BH |
2129 | gfp_mask &= gfp_allowed_mask; |
2130 | ||
11e33f6a MG |
2131 | lockdep_trace_alloc(gfp_mask); |
2132 | ||
2133 | might_sleep_if(gfp_mask & __GFP_WAIT); | |
2134 | ||
2135 | if (should_fail_alloc_page(gfp_mask, order)) | |
2136 | return NULL; | |
2137 | ||
2138 | /* | |
2139 | * Check the zones suitable for the gfp_mask contain at least one | |
2140 | * valid zone. It's possible to have an empty zonelist as a result | |
2141 | * of GFP_THISNODE and a memoryless node | |
2142 | */ | |
2143 | if (unlikely(!zonelist->_zonerefs->zone)) | |
2144 | return NULL; | |
2145 | ||
c0ff7453 | 2146 | get_mems_allowed(); |
5117f45d MG |
2147 | /* The preferred zone is used for statistics later */ |
2148 | first_zones_zonelist(zonelist, high_zoneidx, nodemask, &preferred_zone); | |
c0ff7453 MX |
2149 | if (!preferred_zone) { |
2150 | put_mems_allowed(); | |
5117f45d | 2151 | return NULL; |
c0ff7453 | 2152 | } |
5117f45d MG |
2153 | |
2154 | /* First allocation attempt */ | |
11e33f6a | 2155 | page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order, |
5117f45d | 2156 | zonelist, high_zoneidx, ALLOC_WMARK_LOW|ALLOC_CPUSET, |
3dd28266 | 2157 | preferred_zone, migratetype); |
11e33f6a MG |
2158 | if (unlikely(!page)) |
2159 | page = __alloc_pages_slowpath(gfp_mask, order, | |
5117f45d | 2160 | zonelist, high_zoneidx, nodemask, |
3dd28266 | 2161 | preferred_zone, migratetype); |
c0ff7453 | 2162 | put_mems_allowed(); |
11e33f6a | 2163 | |
4b4f278c | 2164 | trace_mm_page_alloc(page, order, gfp_mask, migratetype); |
11e33f6a | 2165 | return page; |
1da177e4 | 2166 | } |
d239171e | 2167 | EXPORT_SYMBOL(__alloc_pages_nodemask); |
1da177e4 LT |
2168 | |
2169 | /* | |
2170 | * Common helper functions. | |
2171 | */ | |
920c7a5d | 2172 | unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 | 2173 | { |
945a1113 AM |
2174 | struct page *page; |
2175 | ||
2176 | /* | |
2177 | * __get_free_pages() returns a 32-bit address, which cannot represent | |
2178 | * a highmem page | |
2179 | */ | |
2180 | VM_BUG_ON((gfp_mask & __GFP_HIGHMEM) != 0); | |
2181 | ||
1da177e4 LT |
2182 | page = alloc_pages(gfp_mask, order); |
2183 | if (!page) | |
2184 | return 0; | |
2185 | return (unsigned long) page_address(page); | |
2186 | } | |
1da177e4 LT |
2187 | EXPORT_SYMBOL(__get_free_pages); |
2188 | ||
920c7a5d | 2189 | unsigned long get_zeroed_page(gfp_t gfp_mask) |
1da177e4 | 2190 | { |
945a1113 | 2191 | return __get_free_pages(gfp_mask | __GFP_ZERO, 0); |
1da177e4 | 2192 | } |
1da177e4 LT |
2193 | EXPORT_SYMBOL(get_zeroed_page); |
2194 | ||
2195 | void __pagevec_free(struct pagevec *pvec) | |
2196 | { | |
2197 | int i = pagevec_count(pvec); | |
2198 | ||
4b4f278c MG |
2199 | while (--i >= 0) { |
2200 | trace_mm_pagevec_free(pvec->pages[i], pvec->cold); | |
1da177e4 | 2201 | free_hot_cold_page(pvec->pages[i], pvec->cold); |
4b4f278c | 2202 | } |
1da177e4 LT |
2203 | } |
2204 | ||
920c7a5d | 2205 | void __free_pages(struct page *page, unsigned int order) |
1da177e4 | 2206 | { |
b5810039 | 2207 | if (put_page_testzero(page)) { |
1da177e4 | 2208 | if (order == 0) |
fc91668e | 2209 | free_hot_cold_page(page, 0); |
1da177e4 LT |
2210 | else |
2211 | __free_pages_ok(page, order); | |
2212 | } | |
2213 | } | |
2214 | ||
2215 | EXPORT_SYMBOL(__free_pages); | |
2216 | ||
920c7a5d | 2217 | void free_pages(unsigned long addr, unsigned int order) |
1da177e4 LT |
2218 | { |
2219 | if (addr != 0) { | |
725d704e | 2220 | VM_BUG_ON(!virt_addr_valid((void *)addr)); |
1da177e4 LT |
2221 | __free_pages(virt_to_page((void *)addr), order); |
2222 | } | |
2223 | } | |
2224 | ||
2225 | EXPORT_SYMBOL(free_pages); | |
2226 | ||
2be0ffe2 TT |
2227 | /** |
2228 | * alloc_pages_exact - allocate an exact number physically-contiguous pages. | |
2229 | * @size: the number of bytes to allocate | |
2230 | * @gfp_mask: GFP flags for the allocation | |
2231 | * | |
2232 | * This function is similar to alloc_pages(), except that it allocates the | |
2233 | * minimum number of pages to satisfy the request. alloc_pages() can only | |
2234 | * allocate memory in power-of-two pages. | |
2235 | * | |
2236 | * This function is also limited by MAX_ORDER. | |
2237 | * | |
2238 | * Memory allocated by this function must be released by free_pages_exact(). | |
2239 | */ | |
2240 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask) | |
2241 | { | |
2242 | unsigned int order = get_order(size); | |
2243 | unsigned long addr; | |
2244 | ||
2245 | addr = __get_free_pages(gfp_mask, order); | |
2246 | if (addr) { | |
2247 | unsigned long alloc_end = addr + (PAGE_SIZE << order); | |
2248 | unsigned long used = addr + PAGE_ALIGN(size); | |
2249 | ||
5bfd7560 | 2250 | split_page(virt_to_page((void *)addr), order); |
2be0ffe2 TT |
2251 | while (used < alloc_end) { |
2252 | free_page(used); | |
2253 | used += PAGE_SIZE; | |
2254 | } | |
2255 | } | |
2256 | ||
2257 | return (void *)addr; | |
2258 | } | |
2259 | EXPORT_SYMBOL(alloc_pages_exact); | |
2260 | ||
2261 | /** | |
2262 | * free_pages_exact - release memory allocated via alloc_pages_exact() | |
2263 | * @virt: the value returned by alloc_pages_exact. | |
2264 | * @size: size of allocation, same value as passed to alloc_pages_exact(). | |
2265 | * | |
2266 | * Release the memory allocated by a previous call to alloc_pages_exact. | |
2267 | */ | |
2268 | void free_pages_exact(void *virt, size_t size) | |
2269 | { | |
2270 | unsigned long addr = (unsigned long)virt; | |
2271 | unsigned long end = addr + PAGE_ALIGN(size); | |
2272 | ||
2273 | while (addr < end) { | |
2274 | free_page(addr); | |
2275 | addr += PAGE_SIZE; | |
2276 | } | |
2277 | } | |
2278 | EXPORT_SYMBOL(free_pages_exact); | |
2279 | ||
1da177e4 LT |
2280 | static unsigned int nr_free_zone_pages(int offset) |
2281 | { | |
dd1a239f | 2282 | struct zoneref *z; |
54a6eb5c MG |
2283 | struct zone *zone; |
2284 | ||
e310fd43 | 2285 | /* Just pick one node, since fallback list is circular */ |
1da177e4 LT |
2286 | unsigned int sum = 0; |
2287 | ||
0e88460d | 2288 | struct zonelist *zonelist = node_zonelist(numa_node_id(), GFP_KERNEL); |
1da177e4 | 2289 | |
54a6eb5c | 2290 | for_each_zone_zonelist(zone, z, zonelist, offset) { |
e310fd43 | 2291 | unsigned long size = zone->present_pages; |
41858966 | 2292 | unsigned long high = high_wmark_pages(zone); |
e310fd43 MB |
2293 | if (size > high) |
2294 | sum += size - high; | |
1da177e4 LT |
2295 | } |
2296 | ||
2297 | return sum; | |
2298 | } | |
2299 | ||
2300 | /* | |
2301 | * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL | |
2302 | */ | |
2303 | unsigned int nr_free_buffer_pages(void) | |
2304 | { | |
af4ca457 | 2305 | return nr_free_zone_pages(gfp_zone(GFP_USER)); |
1da177e4 | 2306 | } |
c2f1a551 | 2307 | EXPORT_SYMBOL_GPL(nr_free_buffer_pages); |
1da177e4 LT |
2308 | |
2309 | /* | |
2310 | * Amount of free RAM allocatable within all zones | |
2311 | */ | |
2312 | unsigned int nr_free_pagecache_pages(void) | |
2313 | { | |
2a1e274a | 2314 | return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE)); |
1da177e4 | 2315 | } |
08e0f6a9 CL |
2316 | |
2317 | static inline void show_node(struct zone *zone) | |
1da177e4 | 2318 | { |
08e0f6a9 | 2319 | if (NUMA_BUILD) |
25ba77c1 | 2320 | printk("Node %d ", zone_to_nid(zone)); |
1da177e4 | 2321 | } |
1da177e4 | 2322 | |
1da177e4 LT |
2323 | void si_meminfo(struct sysinfo *val) |
2324 | { | |
2325 | val->totalram = totalram_pages; | |
2326 | val->sharedram = 0; | |
d23ad423 | 2327 | val->freeram = global_page_state(NR_FREE_PAGES); |
1da177e4 | 2328 | val->bufferram = nr_blockdev_pages(); |
1da177e4 LT |
2329 | val->totalhigh = totalhigh_pages; |
2330 | val->freehigh = nr_free_highpages(); | |
1da177e4 LT |
2331 | val->mem_unit = PAGE_SIZE; |
2332 | } | |
2333 | ||
2334 | EXPORT_SYMBOL(si_meminfo); | |
2335 | ||
2336 | #ifdef CONFIG_NUMA | |
2337 | void si_meminfo_node(struct sysinfo *val, int nid) | |
2338 | { | |
2339 | pg_data_t *pgdat = NODE_DATA(nid); | |
2340 | ||
2341 | val->totalram = pgdat->node_present_pages; | |
d23ad423 | 2342 | val->freeram = node_page_state(nid, NR_FREE_PAGES); |
98d2b0eb | 2343 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 2344 | val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].present_pages; |
d23ad423 CL |
2345 | val->freehigh = zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM], |
2346 | NR_FREE_PAGES); | |
98d2b0eb CL |
2347 | #else |
2348 | val->totalhigh = 0; | |
2349 | val->freehigh = 0; | |
2350 | #endif | |
1da177e4 LT |
2351 | val->mem_unit = PAGE_SIZE; |
2352 | } | |
2353 | #endif | |
2354 | ||
2355 | #define K(x) ((x) << (PAGE_SHIFT-10)) | |
2356 | ||
2357 | /* | |
2358 | * Show free area list (used inside shift_scroll-lock stuff) | |
2359 | * We also calculate the percentage fragmentation. We do this by counting the | |
2360 | * memory on each free list with the exception of the first item on the list. | |
2361 | */ | |
2362 | void show_free_areas(void) | |
2363 | { | |
c7241913 | 2364 | int cpu; |
1da177e4 LT |
2365 | struct zone *zone; |
2366 | ||
ee99c71c | 2367 | for_each_populated_zone(zone) { |
c7241913 JS |
2368 | show_node(zone); |
2369 | printk("%s per-cpu:\n", zone->name); | |
1da177e4 | 2370 | |
6b482c67 | 2371 | for_each_online_cpu(cpu) { |
1da177e4 LT |
2372 | struct per_cpu_pageset *pageset; |
2373 | ||
99dcc3e5 | 2374 | pageset = per_cpu_ptr(zone->pageset, cpu); |
1da177e4 | 2375 | |
3dfa5721 CL |
2376 | printk("CPU %4d: hi:%5d, btch:%4d usd:%4d\n", |
2377 | cpu, pageset->pcp.high, | |
2378 | pageset->pcp.batch, pageset->pcp.count); | |
1da177e4 LT |
2379 | } |
2380 | } | |
2381 | ||
a731286d KM |
2382 | printk("active_anon:%lu inactive_anon:%lu isolated_anon:%lu\n" |
2383 | " active_file:%lu inactive_file:%lu isolated_file:%lu\n" | |
7b854121 | 2384 | " unevictable:%lu" |
b76146ed | 2385 | " dirty:%lu writeback:%lu unstable:%lu\n" |
3701b033 | 2386 | " free:%lu slab_reclaimable:%lu slab_unreclaimable:%lu\n" |
4b02108a | 2387 | " mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n", |
4f98a2fe | 2388 | global_page_state(NR_ACTIVE_ANON), |
4f98a2fe | 2389 | global_page_state(NR_INACTIVE_ANON), |
a731286d KM |
2390 | global_page_state(NR_ISOLATED_ANON), |
2391 | global_page_state(NR_ACTIVE_FILE), | |
4f98a2fe | 2392 | global_page_state(NR_INACTIVE_FILE), |
a731286d | 2393 | global_page_state(NR_ISOLATED_FILE), |
7b854121 | 2394 | global_page_state(NR_UNEVICTABLE), |
b1e7a8fd | 2395 | global_page_state(NR_FILE_DIRTY), |
ce866b34 | 2396 | global_page_state(NR_WRITEBACK), |
fd39fc85 | 2397 | global_page_state(NR_UNSTABLE_NFS), |
d23ad423 | 2398 | global_page_state(NR_FREE_PAGES), |
3701b033 KM |
2399 | global_page_state(NR_SLAB_RECLAIMABLE), |
2400 | global_page_state(NR_SLAB_UNRECLAIMABLE), | |
65ba55f5 | 2401 | global_page_state(NR_FILE_MAPPED), |
4b02108a | 2402 | global_page_state(NR_SHMEM), |
a25700a5 AM |
2403 | global_page_state(NR_PAGETABLE), |
2404 | global_page_state(NR_BOUNCE)); | |
1da177e4 | 2405 | |
ee99c71c | 2406 | for_each_populated_zone(zone) { |
1da177e4 LT |
2407 | int i; |
2408 | ||
2409 | show_node(zone); | |
2410 | printk("%s" | |
2411 | " free:%lukB" | |
2412 | " min:%lukB" | |
2413 | " low:%lukB" | |
2414 | " high:%lukB" | |
4f98a2fe RR |
2415 | " active_anon:%lukB" |
2416 | " inactive_anon:%lukB" | |
2417 | " active_file:%lukB" | |
2418 | " inactive_file:%lukB" | |
7b854121 | 2419 | " unevictable:%lukB" |
a731286d KM |
2420 | " isolated(anon):%lukB" |
2421 | " isolated(file):%lukB" | |
1da177e4 | 2422 | " present:%lukB" |
4a0aa73f KM |
2423 | " mlocked:%lukB" |
2424 | " dirty:%lukB" | |
2425 | " writeback:%lukB" | |
2426 | " mapped:%lukB" | |
4b02108a | 2427 | " shmem:%lukB" |
4a0aa73f KM |
2428 | " slab_reclaimable:%lukB" |
2429 | " slab_unreclaimable:%lukB" | |
c6a7f572 | 2430 | " kernel_stack:%lukB" |
4a0aa73f KM |
2431 | " pagetables:%lukB" |
2432 | " unstable:%lukB" | |
2433 | " bounce:%lukB" | |
2434 | " writeback_tmp:%lukB" | |
1da177e4 LT |
2435 | " pages_scanned:%lu" |
2436 | " all_unreclaimable? %s" | |
2437 | "\n", | |
2438 | zone->name, | |
aa454840 | 2439 | K(zone_nr_free_pages(zone)), |
41858966 MG |
2440 | K(min_wmark_pages(zone)), |
2441 | K(low_wmark_pages(zone)), | |
2442 | K(high_wmark_pages(zone)), | |
4f98a2fe RR |
2443 | K(zone_page_state(zone, NR_ACTIVE_ANON)), |
2444 | K(zone_page_state(zone, NR_INACTIVE_ANON)), | |
2445 | K(zone_page_state(zone, NR_ACTIVE_FILE)), | |
2446 | K(zone_page_state(zone, NR_INACTIVE_FILE)), | |
7b854121 | 2447 | K(zone_page_state(zone, NR_UNEVICTABLE)), |
a731286d KM |
2448 | K(zone_page_state(zone, NR_ISOLATED_ANON)), |
2449 | K(zone_page_state(zone, NR_ISOLATED_FILE)), | |
1da177e4 | 2450 | K(zone->present_pages), |
4a0aa73f KM |
2451 | K(zone_page_state(zone, NR_MLOCK)), |
2452 | K(zone_page_state(zone, NR_FILE_DIRTY)), | |
2453 | K(zone_page_state(zone, NR_WRITEBACK)), | |
2454 | K(zone_page_state(zone, NR_FILE_MAPPED)), | |
4b02108a | 2455 | K(zone_page_state(zone, NR_SHMEM)), |
4a0aa73f KM |
2456 | K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)), |
2457 | K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)), | |
c6a7f572 KM |
2458 | zone_page_state(zone, NR_KERNEL_STACK) * |
2459 | THREAD_SIZE / 1024, | |
4a0aa73f KM |
2460 | K(zone_page_state(zone, NR_PAGETABLE)), |
2461 | K(zone_page_state(zone, NR_UNSTABLE_NFS)), | |
2462 | K(zone_page_state(zone, NR_BOUNCE)), | |
2463 | K(zone_page_state(zone, NR_WRITEBACK_TEMP)), | |
1da177e4 | 2464 | zone->pages_scanned, |
93e4a89a | 2465 | (zone->all_unreclaimable ? "yes" : "no") |
1da177e4 LT |
2466 | ); |
2467 | printk("lowmem_reserve[]:"); | |
2468 | for (i = 0; i < MAX_NR_ZONES; i++) | |
2469 | printk(" %lu", zone->lowmem_reserve[i]); | |
2470 | printk("\n"); | |
2471 | } | |
2472 | ||
ee99c71c | 2473 | for_each_populated_zone(zone) { |
8f9de51a | 2474 | unsigned long nr[MAX_ORDER], flags, order, total = 0; |
1da177e4 LT |
2475 | |
2476 | show_node(zone); | |
2477 | printk("%s: ", zone->name); | |
1da177e4 LT |
2478 | |
2479 | spin_lock_irqsave(&zone->lock, flags); | |
2480 | for (order = 0; order < MAX_ORDER; order++) { | |
8f9de51a KK |
2481 | nr[order] = zone->free_area[order].nr_free; |
2482 | total += nr[order] << order; | |
1da177e4 LT |
2483 | } |
2484 | spin_unlock_irqrestore(&zone->lock, flags); | |
8f9de51a KK |
2485 | for (order = 0; order < MAX_ORDER; order++) |
2486 | printk("%lu*%lukB ", nr[order], K(1UL) << order); | |
1da177e4 LT |
2487 | printk("= %lukB\n", K(total)); |
2488 | } | |
2489 | ||
e6f3602d LW |
2490 | printk("%ld total pagecache pages\n", global_page_state(NR_FILE_PAGES)); |
2491 | ||
1da177e4 LT |
2492 | show_swap_cache_info(); |
2493 | } | |
2494 | ||
19770b32 MG |
2495 | static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref) |
2496 | { | |
2497 | zoneref->zone = zone; | |
2498 | zoneref->zone_idx = zone_idx(zone); | |
2499 | } | |
2500 | ||
1da177e4 LT |
2501 | /* |
2502 | * Builds allocation fallback zone lists. | |
1a93205b CL |
2503 | * |
2504 | * Add all populated zones of a node to the zonelist. | |
1da177e4 | 2505 | */ |
f0c0b2b8 KH |
2506 | static int build_zonelists_node(pg_data_t *pgdat, struct zonelist *zonelist, |
2507 | int nr_zones, enum zone_type zone_type) | |
1da177e4 | 2508 | { |
1a93205b CL |
2509 | struct zone *zone; |
2510 | ||
98d2b0eb | 2511 | BUG_ON(zone_type >= MAX_NR_ZONES); |
2f6726e5 | 2512 | zone_type++; |
02a68a5e CL |
2513 | |
2514 | do { | |
2f6726e5 | 2515 | zone_type--; |
070f8032 | 2516 | zone = pgdat->node_zones + zone_type; |
1a93205b | 2517 | if (populated_zone(zone)) { |
dd1a239f MG |
2518 | zoneref_set_zone(zone, |
2519 | &zonelist->_zonerefs[nr_zones++]); | |
070f8032 | 2520 | check_highest_zone(zone_type); |
1da177e4 | 2521 | } |
02a68a5e | 2522 | |
2f6726e5 | 2523 | } while (zone_type); |
070f8032 | 2524 | return nr_zones; |
1da177e4 LT |
2525 | } |
2526 | ||
f0c0b2b8 KH |
2527 | |
2528 | /* | |
2529 | * zonelist_order: | |
2530 | * 0 = automatic detection of better ordering. | |
2531 | * 1 = order by ([node] distance, -zonetype) | |
2532 | * 2 = order by (-zonetype, [node] distance) | |
2533 | * | |
2534 | * If not NUMA, ZONELIST_ORDER_ZONE and ZONELIST_ORDER_NODE will create | |
2535 | * the same zonelist. So only NUMA can configure this param. | |
2536 | */ | |
2537 | #define ZONELIST_ORDER_DEFAULT 0 | |
2538 | #define ZONELIST_ORDER_NODE 1 | |
2539 | #define ZONELIST_ORDER_ZONE 2 | |
2540 | ||
2541 | /* zonelist order in the kernel. | |
2542 | * set_zonelist_order() will set this to NODE or ZONE. | |
2543 | */ | |
2544 | static int current_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
2545 | static char zonelist_order_name[3][8] = {"Default", "Node", "Zone"}; | |
2546 | ||
2547 | ||
1da177e4 | 2548 | #ifdef CONFIG_NUMA |
f0c0b2b8 KH |
2549 | /* The value user specified ....changed by config */ |
2550 | static int user_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
2551 | /* string for sysctl */ | |
2552 | #define NUMA_ZONELIST_ORDER_LEN 16 | |
2553 | char numa_zonelist_order[16] = "default"; | |
2554 | ||
2555 | /* | |
2556 | * interface for configure zonelist ordering. | |
2557 | * command line option "numa_zonelist_order" | |
2558 | * = "[dD]efault - default, automatic configuration. | |
2559 | * = "[nN]ode - order by node locality, then by zone within node | |
2560 | * = "[zZ]one - order by zone, then by locality within zone | |
2561 | */ | |
2562 | ||
2563 | static int __parse_numa_zonelist_order(char *s) | |
2564 | { | |
2565 | if (*s == 'd' || *s == 'D') { | |
2566 | user_zonelist_order = ZONELIST_ORDER_DEFAULT; | |
2567 | } else if (*s == 'n' || *s == 'N') { | |
2568 | user_zonelist_order = ZONELIST_ORDER_NODE; | |
2569 | } else if (*s == 'z' || *s == 'Z') { | |
2570 | user_zonelist_order = ZONELIST_ORDER_ZONE; | |
2571 | } else { | |
2572 | printk(KERN_WARNING | |
2573 | "Ignoring invalid numa_zonelist_order value: " | |
2574 | "%s\n", s); | |
2575 | return -EINVAL; | |
2576 | } | |
2577 | return 0; | |
2578 | } | |
2579 | ||
2580 | static __init int setup_numa_zonelist_order(char *s) | |
2581 | { | |
2582 | if (s) | |
2583 | return __parse_numa_zonelist_order(s); | |
2584 | return 0; | |
2585 | } | |
2586 | early_param("numa_zonelist_order", setup_numa_zonelist_order); | |
2587 | ||
2588 | /* | |
2589 | * sysctl handler for numa_zonelist_order | |
2590 | */ | |
2591 | int numa_zonelist_order_handler(ctl_table *table, int write, | |
8d65af78 | 2592 | void __user *buffer, size_t *length, |
f0c0b2b8 KH |
2593 | loff_t *ppos) |
2594 | { | |
2595 | char saved_string[NUMA_ZONELIST_ORDER_LEN]; | |
2596 | int ret; | |
443c6f14 | 2597 | static DEFINE_MUTEX(zl_order_mutex); |
f0c0b2b8 | 2598 | |
443c6f14 | 2599 | mutex_lock(&zl_order_mutex); |
f0c0b2b8 | 2600 | if (write) |
443c6f14 | 2601 | strcpy(saved_string, (char*)table->data); |
8d65af78 | 2602 | ret = proc_dostring(table, write, buffer, length, ppos); |
f0c0b2b8 | 2603 | if (ret) |
443c6f14 | 2604 | goto out; |
f0c0b2b8 KH |
2605 | if (write) { |
2606 | int oldval = user_zonelist_order; | |
2607 | if (__parse_numa_zonelist_order((char*)table->data)) { | |
2608 | /* | |
2609 | * bogus value. restore saved string | |
2610 | */ | |
2611 | strncpy((char*)table->data, saved_string, | |
2612 | NUMA_ZONELIST_ORDER_LEN); | |
2613 | user_zonelist_order = oldval; | |
4eaf3f64 HL |
2614 | } else if (oldval != user_zonelist_order) { |
2615 | mutex_lock(&zonelists_mutex); | |
1f522509 | 2616 | build_all_zonelists(NULL); |
4eaf3f64 HL |
2617 | mutex_unlock(&zonelists_mutex); |
2618 | } | |
f0c0b2b8 | 2619 | } |
443c6f14 AK |
2620 | out: |
2621 | mutex_unlock(&zl_order_mutex); | |
2622 | return ret; | |
f0c0b2b8 KH |
2623 | } |
2624 | ||
2625 | ||
62bc62a8 | 2626 | #define MAX_NODE_LOAD (nr_online_nodes) |
f0c0b2b8 KH |
2627 | static int node_load[MAX_NUMNODES]; |
2628 | ||
1da177e4 | 2629 | /** |
4dc3b16b | 2630 | * find_next_best_node - find the next node that should appear in a given node's fallback list |
1da177e4 LT |
2631 | * @node: node whose fallback list we're appending |
2632 | * @used_node_mask: nodemask_t of already used nodes | |
2633 | * | |
2634 | * We use a number of factors to determine which is the next node that should | |
2635 | * appear on a given node's fallback list. The node should not have appeared | |
2636 | * already in @node's fallback list, and it should be the next closest node | |
2637 | * according to the distance array (which contains arbitrary distance values | |
2638 | * from each node to each node in the system), and should also prefer nodes | |
2639 | * with no CPUs, since presumably they'll have very little allocation pressure | |
2640 | * on them otherwise. | |
2641 | * It returns -1 if no node is found. | |
2642 | */ | |
f0c0b2b8 | 2643 | static int find_next_best_node(int node, nodemask_t *used_node_mask) |
1da177e4 | 2644 | { |
4cf808eb | 2645 | int n, val; |
1da177e4 LT |
2646 | int min_val = INT_MAX; |
2647 | int best_node = -1; | |
a70f7302 | 2648 | const struct cpumask *tmp = cpumask_of_node(0); |
1da177e4 | 2649 | |
4cf808eb LT |
2650 | /* Use the local node if we haven't already */ |
2651 | if (!node_isset(node, *used_node_mask)) { | |
2652 | node_set(node, *used_node_mask); | |
2653 | return node; | |
2654 | } | |
1da177e4 | 2655 | |
37b07e41 | 2656 | for_each_node_state(n, N_HIGH_MEMORY) { |
1da177e4 LT |
2657 | |
2658 | /* Don't want a node to appear more than once */ | |
2659 | if (node_isset(n, *used_node_mask)) | |
2660 | continue; | |
2661 | ||
1da177e4 LT |
2662 | /* Use the distance array to find the distance */ |
2663 | val = node_distance(node, n); | |
2664 | ||
4cf808eb LT |
2665 | /* Penalize nodes under us ("prefer the next node") */ |
2666 | val += (n < node); | |
2667 | ||
1da177e4 | 2668 | /* Give preference to headless and unused nodes */ |
a70f7302 RR |
2669 | tmp = cpumask_of_node(n); |
2670 | if (!cpumask_empty(tmp)) | |
1da177e4 LT |
2671 | val += PENALTY_FOR_NODE_WITH_CPUS; |
2672 | ||
2673 | /* Slight preference for less loaded node */ | |
2674 | val *= (MAX_NODE_LOAD*MAX_NUMNODES); | |
2675 | val += node_load[n]; | |
2676 | ||
2677 | if (val < min_val) { | |
2678 | min_val = val; | |
2679 | best_node = n; | |
2680 | } | |
2681 | } | |
2682 | ||
2683 | if (best_node >= 0) | |
2684 | node_set(best_node, *used_node_mask); | |
2685 | ||
2686 | return best_node; | |
2687 | } | |
2688 | ||
f0c0b2b8 KH |
2689 | |
2690 | /* | |
2691 | * Build zonelists ordered by node and zones within node. | |
2692 | * This results in maximum locality--normal zone overflows into local | |
2693 | * DMA zone, if any--but risks exhausting DMA zone. | |
2694 | */ | |
2695 | static void build_zonelists_in_node_order(pg_data_t *pgdat, int node) | |
1da177e4 | 2696 | { |
f0c0b2b8 | 2697 | int j; |
1da177e4 | 2698 | struct zonelist *zonelist; |
f0c0b2b8 | 2699 | |
54a6eb5c | 2700 | zonelist = &pgdat->node_zonelists[0]; |
dd1a239f | 2701 | for (j = 0; zonelist->_zonerefs[j].zone != NULL; j++) |
54a6eb5c MG |
2702 | ; |
2703 | j = build_zonelists_node(NODE_DATA(node), zonelist, j, | |
2704 | MAX_NR_ZONES - 1); | |
dd1a239f MG |
2705 | zonelist->_zonerefs[j].zone = NULL; |
2706 | zonelist->_zonerefs[j].zone_idx = 0; | |
f0c0b2b8 KH |
2707 | } |
2708 | ||
523b9458 CL |
2709 | /* |
2710 | * Build gfp_thisnode zonelists | |
2711 | */ | |
2712 | static void build_thisnode_zonelists(pg_data_t *pgdat) | |
2713 | { | |
523b9458 CL |
2714 | int j; |
2715 | struct zonelist *zonelist; | |
2716 | ||
54a6eb5c MG |
2717 | zonelist = &pgdat->node_zonelists[1]; |
2718 | j = build_zonelists_node(pgdat, zonelist, 0, MAX_NR_ZONES - 1); | |
dd1a239f MG |
2719 | zonelist->_zonerefs[j].zone = NULL; |
2720 | zonelist->_zonerefs[j].zone_idx = 0; | |
523b9458 CL |
2721 | } |
2722 | ||
f0c0b2b8 KH |
2723 | /* |
2724 | * Build zonelists ordered by zone and nodes within zones. | |
2725 | * This results in conserving DMA zone[s] until all Normal memory is | |
2726 | * exhausted, but results in overflowing to remote node while memory | |
2727 | * may still exist in local DMA zone. | |
2728 | */ | |
2729 | static int node_order[MAX_NUMNODES]; | |
2730 | ||
2731 | static void build_zonelists_in_zone_order(pg_data_t *pgdat, int nr_nodes) | |
2732 | { | |
f0c0b2b8 KH |
2733 | int pos, j, node; |
2734 | int zone_type; /* needs to be signed */ | |
2735 | struct zone *z; | |
2736 | struct zonelist *zonelist; | |
2737 | ||
54a6eb5c MG |
2738 | zonelist = &pgdat->node_zonelists[0]; |
2739 | pos = 0; | |
2740 | for (zone_type = MAX_NR_ZONES - 1; zone_type >= 0; zone_type--) { | |
2741 | for (j = 0; j < nr_nodes; j++) { | |
2742 | node = node_order[j]; | |
2743 | z = &NODE_DATA(node)->node_zones[zone_type]; | |
2744 | if (populated_zone(z)) { | |
dd1a239f MG |
2745 | zoneref_set_zone(z, |
2746 | &zonelist->_zonerefs[pos++]); | |
54a6eb5c | 2747 | check_highest_zone(zone_type); |
f0c0b2b8 KH |
2748 | } |
2749 | } | |
f0c0b2b8 | 2750 | } |
dd1a239f MG |
2751 | zonelist->_zonerefs[pos].zone = NULL; |
2752 | zonelist->_zonerefs[pos].zone_idx = 0; | |
f0c0b2b8 KH |
2753 | } |
2754 | ||
2755 | static int default_zonelist_order(void) | |
2756 | { | |
2757 | int nid, zone_type; | |
2758 | unsigned long low_kmem_size,total_size; | |
2759 | struct zone *z; | |
2760 | int average_size; | |
2761 | /* | |
88393161 | 2762 | * ZONE_DMA and ZONE_DMA32 can be very small area in the system. |
f0c0b2b8 KH |
2763 | * If they are really small and used heavily, the system can fall |
2764 | * into OOM very easily. | |
e325c90f | 2765 | * This function detect ZONE_DMA/DMA32 size and configures zone order. |
f0c0b2b8 KH |
2766 | */ |
2767 | /* Is there ZONE_NORMAL ? (ex. ppc has only DMA zone..) */ | |
2768 | low_kmem_size = 0; | |
2769 | total_size = 0; | |
2770 | for_each_online_node(nid) { | |
2771 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) { | |
2772 | z = &NODE_DATA(nid)->node_zones[zone_type]; | |
2773 | if (populated_zone(z)) { | |
2774 | if (zone_type < ZONE_NORMAL) | |
2775 | low_kmem_size += z->present_pages; | |
2776 | total_size += z->present_pages; | |
e325c90f DR |
2777 | } else if (zone_type == ZONE_NORMAL) { |
2778 | /* | |
2779 | * If any node has only lowmem, then node order | |
2780 | * is preferred to allow kernel allocations | |
2781 | * locally; otherwise, they can easily infringe | |
2782 | * on other nodes when there is an abundance of | |
2783 | * lowmem available to allocate from. | |
2784 | */ | |
2785 | return ZONELIST_ORDER_NODE; | |
f0c0b2b8 KH |
2786 | } |
2787 | } | |
2788 | } | |
2789 | if (!low_kmem_size || /* there are no DMA area. */ | |
2790 | low_kmem_size > total_size/2) /* DMA/DMA32 is big. */ | |
2791 | return ZONELIST_ORDER_NODE; | |
2792 | /* | |
2793 | * look into each node's config. | |
2794 | * If there is a node whose DMA/DMA32 memory is very big area on | |
2795 | * local memory, NODE_ORDER may be suitable. | |
2796 | */ | |
37b07e41 LS |
2797 | average_size = total_size / |
2798 | (nodes_weight(node_states[N_HIGH_MEMORY]) + 1); | |
f0c0b2b8 KH |
2799 | for_each_online_node(nid) { |
2800 | low_kmem_size = 0; | |
2801 | total_size = 0; | |
2802 | for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) { | |
2803 | z = &NODE_DATA(nid)->node_zones[zone_type]; | |
2804 | if (populated_zone(z)) { | |
2805 | if (zone_type < ZONE_NORMAL) | |
2806 | low_kmem_size += z->present_pages; | |
2807 | total_size += z->present_pages; | |
2808 | } | |
2809 | } | |
2810 | if (low_kmem_size && | |
2811 | total_size > average_size && /* ignore small node */ | |
2812 | low_kmem_size > total_size * 70/100) | |
2813 | return ZONELIST_ORDER_NODE; | |
2814 | } | |
2815 | return ZONELIST_ORDER_ZONE; | |
2816 | } | |
2817 | ||
2818 | static void set_zonelist_order(void) | |
2819 | { | |
2820 | if (user_zonelist_order == ZONELIST_ORDER_DEFAULT) | |
2821 | current_zonelist_order = default_zonelist_order(); | |
2822 | else | |
2823 | current_zonelist_order = user_zonelist_order; | |
2824 | } | |
2825 | ||
2826 | static void build_zonelists(pg_data_t *pgdat) | |
2827 | { | |
2828 | int j, node, load; | |
2829 | enum zone_type i; | |
1da177e4 | 2830 | nodemask_t used_mask; |
f0c0b2b8 KH |
2831 | int local_node, prev_node; |
2832 | struct zonelist *zonelist; | |
2833 | int order = current_zonelist_order; | |
1da177e4 LT |
2834 | |
2835 | /* initialize zonelists */ | |
523b9458 | 2836 | for (i = 0; i < MAX_ZONELISTS; i++) { |
1da177e4 | 2837 | zonelist = pgdat->node_zonelists + i; |
dd1a239f MG |
2838 | zonelist->_zonerefs[0].zone = NULL; |
2839 | zonelist->_zonerefs[0].zone_idx = 0; | |
1da177e4 LT |
2840 | } |
2841 | ||
2842 | /* NUMA-aware ordering of nodes */ | |
2843 | local_node = pgdat->node_id; | |
62bc62a8 | 2844 | load = nr_online_nodes; |
1da177e4 LT |
2845 | prev_node = local_node; |
2846 | nodes_clear(used_mask); | |
f0c0b2b8 | 2847 | |
f0c0b2b8 KH |
2848 | memset(node_order, 0, sizeof(node_order)); |
2849 | j = 0; | |
2850 | ||
1da177e4 | 2851 | while ((node = find_next_best_node(local_node, &used_mask)) >= 0) { |
9eeff239 CL |
2852 | int distance = node_distance(local_node, node); |
2853 | ||
2854 | /* | |
2855 | * If another node is sufficiently far away then it is better | |
2856 | * to reclaim pages in a zone before going off node. | |
2857 | */ | |
2858 | if (distance > RECLAIM_DISTANCE) | |
2859 | zone_reclaim_mode = 1; | |
2860 | ||
1da177e4 LT |
2861 | /* |
2862 | * We don't want to pressure a particular node. | |
2863 | * So adding penalty to the first node in same | |
2864 | * distance group to make it round-robin. | |
2865 | */ | |
9eeff239 | 2866 | if (distance != node_distance(local_node, prev_node)) |
f0c0b2b8 KH |
2867 | node_load[node] = load; |
2868 | ||
1da177e4 LT |
2869 | prev_node = node; |
2870 | load--; | |
f0c0b2b8 KH |
2871 | if (order == ZONELIST_ORDER_NODE) |
2872 | build_zonelists_in_node_order(pgdat, node); | |
2873 | else | |
2874 | node_order[j++] = node; /* remember order */ | |
2875 | } | |
1da177e4 | 2876 | |
f0c0b2b8 KH |
2877 | if (order == ZONELIST_ORDER_ZONE) { |
2878 | /* calculate node order -- i.e., DMA last! */ | |
2879 | build_zonelists_in_zone_order(pgdat, j); | |
1da177e4 | 2880 | } |
523b9458 CL |
2881 | |
2882 | build_thisnode_zonelists(pgdat); | |
1da177e4 LT |
2883 | } |
2884 | ||
9276b1bc | 2885 | /* Construct the zonelist performance cache - see further mmzone.h */ |
f0c0b2b8 | 2886 | static void build_zonelist_cache(pg_data_t *pgdat) |
9276b1bc | 2887 | { |
54a6eb5c MG |
2888 | struct zonelist *zonelist; |
2889 | struct zonelist_cache *zlc; | |
dd1a239f | 2890 | struct zoneref *z; |
9276b1bc | 2891 | |
54a6eb5c MG |
2892 | zonelist = &pgdat->node_zonelists[0]; |
2893 | zonelist->zlcache_ptr = zlc = &zonelist->zlcache; | |
2894 | bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST); | |
dd1a239f MG |
2895 | for (z = zonelist->_zonerefs; z->zone; z++) |
2896 | zlc->z_to_n[z - zonelist->_zonerefs] = zonelist_node_idx(z); | |
9276b1bc PJ |
2897 | } |
2898 | ||
7aac7898 LS |
2899 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
2900 | /* | |
2901 | * Return node id of node used for "local" allocations. | |
2902 | * I.e., first node id of first zone in arg node's generic zonelist. | |
2903 | * Used for initializing percpu 'numa_mem', which is used primarily | |
2904 | * for kernel allocations, so use GFP_KERNEL flags to locate zonelist. | |
2905 | */ | |
2906 | int local_memory_node(int node) | |
2907 | { | |
2908 | struct zone *zone; | |
2909 | ||
2910 | (void)first_zones_zonelist(node_zonelist(node, GFP_KERNEL), | |
2911 | gfp_zone(GFP_KERNEL), | |
2912 | NULL, | |
2913 | &zone); | |
2914 | return zone->node; | |
2915 | } | |
2916 | #endif | |
f0c0b2b8 | 2917 | |
1da177e4 LT |
2918 | #else /* CONFIG_NUMA */ |
2919 | ||
f0c0b2b8 KH |
2920 | static void set_zonelist_order(void) |
2921 | { | |
2922 | current_zonelist_order = ZONELIST_ORDER_ZONE; | |
2923 | } | |
2924 | ||
2925 | static void build_zonelists(pg_data_t *pgdat) | |
1da177e4 | 2926 | { |
19655d34 | 2927 | int node, local_node; |
54a6eb5c MG |
2928 | enum zone_type j; |
2929 | struct zonelist *zonelist; | |
1da177e4 LT |
2930 | |
2931 | local_node = pgdat->node_id; | |
1da177e4 | 2932 | |
54a6eb5c MG |
2933 | zonelist = &pgdat->node_zonelists[0]; |
2934 | j = build_zonelists_node(pgdat, zonelist, 0, MAX_NR_ZONES - 1); | |
1da177e4 | 2935 | |
54a6eb5c MG |
2936 | /* |
2937 | * Now we build the zonelist so that it contains the zones | |
2938 | * of all the other nodes. | |
2939 | * We don't want to pressure a particular node, so when | |
2940 | * building the zones for node N, we make sure that the | |
2941 | * zones coming right after the local ones are those from | |
2942 | * node N+1 (modulo N) | |
2943 | */ | |
2944 | for (node = local_node + 1; node < MAX_NUMNODES; node++) { | |
2945 | if (!node_online(node)) | |
2946 | continue; | |
2947 | j = build_zonelists_node(NODE_DATA(node), zonelist, j, | |
2948 | MAX_NR_ZONES - 1); | |
1da177e4 | 2949 | } |
54a6eb5c MG |
2950 | for (node = 0; node < local_node; node++) { |
2951 | if (!node_online(node)) | |
2952 | continue; | |
2953 | j = build_zonelists_node(NODE_DATA(node), zonelist, j, | |
2954 | MAX_NR_ZONES - 1); | |
2955 | } | |
2956 | ||
dd1a239f MG |
2957 | zonelist->_zonerefs[j].zone = NULL; |
2958 | zonelist->_zonerefs[j].zone_idx = 0; | |
1da177e4 LT |
2959 | } |
2960 | ||
9276b1bc | 2961 | /* non-NUMA variant of zonelist performance cache - just NULL zlcache_ptr */ |
f0c0b2b8 | 2962 | static void build_zonelist_cache(pg_data_t *pgdat) |
9276b1bc | 2963 | { |
54a6eb5c | 2964 | pgdat->node_zonelists[0].zlcache_ptr = NULL; |
9276b1bc PJ |
2965 | } |
2966 | ||
1da177e4 LT |
2967 | #endif /* CONFIG_NUMA */ |
2968 | ||
99dcc3e5 CL |
2969 | /* |
2970 | * Boot pageset table. One per cpu which is going to be used for all | |
2971 | * zones and all nodes. The parameters will be set in such a way | |
2972 | * that an item put on a list will immediately be handed over to | |
2973 | * the buddy list. This is safe since pageset manipulation is done | |
2974 | * with interrupts disabled. | |
2975 | * | |
2976 | * The boot_pagesets must be kept even after bootup is complete for | |
2977 | * unused processors and/or zones. They do play a role for bootstrapping | |
2978 | * hotplugged processors. | |
2979 | * | |
2980 | * zoneinfo_show() and maybe other functions do | |
2981 | * not check if the processor is online before following the pageset pointer. | |
2982 | * Other parts of the kernel may not check if the zone is available. | |
2983 | */ | |
2984 | static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch); | |
2985 | static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset); | |
1f522509 | 2986 | static void setup_zone_pageset(struct zone *zone); |
99dcc3e5 | 2987 | |
4eaf3f64 HL |
2988 | /* |
2989 | * Global mutex to protect against size modification of zonelists | |
2990 | * as well as to serialize pageset setup for the new populated zone. | |
2991 | */ | |
2992 | DEFINE_MUTEX(zonelists_mutex); | |
2993 | ||
9b1a4d38 | 2994 | /* return values int ....just for stop_machine() */ |
1f522509 | 2995 | static __init_refok int __build_all_zonelists(void *data) |
1da177e4 | 2996 | { |
6811378e | 2997 | int nid; |
99dcc3e5 | 2998 | int cpu; |
9276b1bc | 2999 | |
7f9cfb31 BL |
3000 | #ifdef CONFIG_NUMA |
3001 | memset(node_load, 0, sizeof(node_load)); | |
3002 | #endif | |
9276b1bc | 3003 | for_each_online_node(nid) { |
7ea1530a CL |
3004 | pg_data_t *pgdat = NODE_DATA(nid); |
3005 | ||
3006 | build_zonelists(pgdat); | |
3007 | build_zonelist_cache(pgdat); | |
9276b1bc | 3008 | } |
99dcc3e5 | 3009 | |
1f522509 HL |
3010 | #ifdef CONFIG_MEMORY_HOTPLUG |
3011 | /* Setup real pagesets for the new zone */ | |
3012 | if (data) { | |
3013 | struct zone *zone = data; | |
3014 | setup_zone_pageset(zone); | |
3015 | } | |
3016 | #endif | |
3017 | ||
99dcc3e5 CL |
3018 | /* |
3019 | * Initialize the boot_pagesets that are going to be used | |
3020 | * for bootstrapping processors. The real pagesets for | |
3021 | * each zone will be allocated later when the per cpu | |
3022 | * allocator is available. | |
3023 | * | |
3024 | * boot_pagesets are used also for bootstrapping offline | |
3025 | * cpus if the system is already booted because the pagesets | |
3026 | * are needed to initialize allocators on a specific cpu too. | |
3027 | * F.e. the percpu allocator needs the page allocator which | |
3028 | * needs the percpu allocator in order to allocate its pagesets | |
3029 | * (a chicken-egg dilemma). | |
3030 | */ | |
7aac7898 | 3031 | for_each_possible_cpu(cpu) { |
99dcc3e5 CL |
3032 | setup_pageset(&per_cpu(boot_pageset, cpu), 0); |
3033 | ||
7aac7898 LS |
3034 | #ifdef CONFIG_HAVE_MEMORYLESS_NODES |
3035 | /* | |
3036 | * We now know the "local memory node" for each node-- | |
3037 | * i.e., the node of the first zone in the generic zonelist. | |
3038 | * Set up numa_mem percpu variable for on-line cpus. During | |
3039 | * boot, only the boot cpu should be on-line; we'll init the | |
3040 | * secondary cpus' numa_mem as they come on-line. During | |
3041 | * node/memory hotplug, we'll fixup all on-line cpus. | |
3042 | */ | |
3043 | if (cpu_online(cpu)) | |
3044 | set_cpu_numa_mem(cpu, local_memory_node(cpu_to_node(cpu))); | |
3045 | #endif | |
3046 | } | |
3047 | ||
6811378e YG |
3048 | return 0; |
3049 | } | |
3050 | ||
4eaf3f64 HL |
3051 | /* |
3052 | * Called with zonelists_mutex held always | |
3053 | * unless system_state == SYSTEM_BOOTING. | |
3054 | */ | |
1f522509 | 3055 | void build_all_zonelists(void *data) |
6811378e | 3056 | { |
f0c0b2b8 KH |
3057 | set_zonelist_order(); |
3058 | ||
6811378e | 3059 | if (system_state == SYSTEM_BOOTING) { |
423b41d7 | 3060 | __build_all_zonelists(NULL); |
68ad8df4 | 3061 | mminit_verify_zonelist(); |
6811378e YG |
3062 | cpuset_init_current_mems_allowed(); |
3063 | } else { | |
183ff22b | 3064 | /* we have to stop all cpus to guarantee there is no user |
6811378e | 3065 | of zonelist */ |
1f522509 | 3066 | stop_machine(__build_all_zonelists, data, NULL); |
6811378e YG |
3067 | /* cpuset refresh routine should be here */ |
3068 | } | |
bd1e22b8 | 3069 | vm_total_pages = nr_free_pagecache_pages(); |
9ef9acb0 MG |
3070 | /* |
3071 | * Disable grouping by mobility if the number of pages in the | |
3072 | * system is too low to allow the mechanism to work. It would be | |
3073 | * more accurate, but expensive to check per-zone. This check is | |
3074 | * made on memory-hotadd so a system can start with mobility | |
3075 | * disabled and enable it later | |
3076 | */ | |
d9c23400 | 3077 | if (vm_total_pages < (pageblock_nr_pages * MIGRATE_TYPES)) |
9ef9acb0 MG |
3078 | page_group_by_mobility_disabled = 1; |
3079 | else | |
3080 | page_group_by_mobility_disabled = 0; | |
3081 | ||
3082 | printk("Built %i zonelists in %s order, mobility grouping %s. " | |
3083 | "Total pages: %ld\n", | |
62bc62a8 | 3084 | nr_online_nodes, |
f0c0b2b8 | 3085 | zonelist_order_name[current_zonelist_order], |
9ef9acb0 | 3086 | page_group_by_mobility_disabled ? "off" : "on", |
f0c0b2b8 KH |
3087 | vm_total_pages); |
3088 | #ifdef CONFIG_NUMA | |
3089 | printk("Policy zone: %s\n", zone_names[policy_zone]); | |
3090 | #endif | |
1da177e4 LT |
3091 | } |
3092 | ||
3093 | /* | |
3094 | * Helper functions to size the waitqueue hash table. | |
3095 | * Essentially these want to choose hash table sizes sufficiently | |
3096 | * large so that collisions trying to wait on pages are rare. | |
3097 | * But in fact, the number of active page waitqueues on typical | |
3098 | * systems is ridiculously low, less than 200. So this is even | |
3099 | * conservative, even though it seems large. | |
3100 | * | |
3101 | * The constant PAGES_PER_WAITQUEUE specifies the ratio of pages to | |
3102 | * waitqueues, i.e. the size of the waitq table given the number of pages. | |
3103 | */ | |
3104 | #define PAGES_PER_WAITQUEUE 256 | |
3105 | ||
cca448fe | 3106 | #ifndef CONFIG_MEMORY_HOTPLUG |
02b694de | 3107 | static inline unsigned long wait_table_hash_nr_entries(unsigned long pages) |
1da177e4 LT |
3108 | { |
3109 | unsigned long size = 1; | |
3110 | ||
3111 | pages /= PAGES_PER_WAITQUEUE; | |
3112 | ||
3113 | while (size < pages) | |
3114 | size <<= 1; | |
3115 | ||
3116 | /* | |
3117 | * Once we have dozens or even hundreds of threads sleeping | |
3118 | * on IO we've got bigger problems than wait queue collision. | |
3119 | * Limit the size of the wait table to a reasonable size. | |
3120 | */ | |
3121 | size = min(size, 4096UL); | |
3122 | ||
3123 | return max(size, 4UL); | |
3124 | } | |
cca448fe YG |
3125 | #else |
3126 | /* | |
3127 | * A zone's size might be changed by hot-add, so it is not possible to determine | |
3128 | * a suitable size for its wait_table. So we use the maximum size now. | |
3129 | * | |
3130 | * The max wait table size = 4096 x sizeof(wait_queue_head_t). ie: | |
3131 | * | |
3132 | * i386 (preemption config) : 4096 x 16 = 64Kbyte. | |
3133 | * ia64, x86-64 (no preemption): 4096 x 20 = 80Kbyte. | |
3134 | * ia64, x86-64 (preemption) : 4096 x 24 = 96Kbyte. | |
3135 | * | |
3136 | * The maximum entries are prepared when a zone's memory is (512K + 256) pages | |
3137 | * or more by the traditional way. (See above). It equals: | |
3138 | * | |
3139 | * i386, x86-64, powerpc(4K page size) : = ( 2G + 1M)byte. | |
3140 | * ia64(16K page size) : = ( 8G + 4M)byte. | |
3141 | * powerpc (64K page size) : = (32G +16M)byte. | |
3142 | */ | |
3143 | static inline unsigned long wait_table_hash_nr_entries(unsigned long pages) | |
3144 | { | |
3145 | return 4096UL; | |
3146 | } | |
3147 | #endif | |
1da177e4 LT |
3148 | |
3149 | /* | |
3150 | * This is an integer logarithm so that shifts can be used later | |
3151 | * to extract the more random high bits from the multiplicative | |
3152 | * hash function before the remainder is taken. | |
3153 | */ | |
3154 | static inline unsigned long wait_table_bits(unsigned long size) | |
3155 | { | |
3156 | return ffz(~size); | |
3157 | } | |
3158 | ||
3159 | #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1)) | |
3160 | ||
56fd56b8 | 3161 | /* |
d9c23400 | 3162 | * Mark a number of pageblocks as MIGRATE_RESERVE. The number |
41858966 MG |
3163 | * of blocks reserved is based on min_wmark_pages(zone). The memory within |
3164 | * the reserve will tend to store contiguous free pages. Setting min_free_kbytes | |
56fd56b8 MG |
3165 | * higher will lead to a bigger reserve which will get freed as contiguous |
3166 | * blocks as reclaim kicks in | |
3167 | */ | |
3168 | static void setup_zone_migrate_reserve(struct zone *zone) | |
3169 | { | |
3170 | unsigned long start_pfn, pfn, end_pfn; | |
3171 | struct page *page; | |
78986a67 MG |
3172 | unsigned long block_migratetype; |
3173 | int reserve; | |
56fd56b8 MG |
3174 | |
3175 | /* Get the start pfn, end pfn and the number of blocks to reserve */ | |
3176 | start_pfn = zone->zone_start_pfn; | |
3177 | end_pfn = start_pfn + zone->spanned_pages; | |
41858966 | 3178 | reserve = roundup(min_wmark_pages(zone), pageblock_nr_pages) >> |
d9c23400 | 3179 | pageblock_order; |
56fd56b8 | 3180 | |
78986a67 MG |
3181 | /* |
3182 | * Reserve blocks are generally in place to help high-order atomic | |
3183 | * allocations that are short-lived. A min_free_kbytes value that | |
3184 | * would result in more than 2 reserve blocks for atomic allocations | |
3185 | * is assumed to be in place to help anti-fragmentation for the | |
3186 | * future allocation of hugepages at runtime. | |
3187 | */ | |
3188 | reserve = min(2, reserve); | |
3189 | ||
d9c23400 | 3190 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { |
56fd56b8 MG |
3191 | if (!pfn_valid(pfn)) |
3192 | continue; | |
3193 | page = pfn_to_page(pfn); | |
3194 | ||
344c790e AL |
3195 | /* Watch out for overlapping nodes */ |
3196 | if (page_to_nid(page) != zone_to_nid(zone)) | |
3197 | continue; | |
3198 | ||
56fd56b8 MG |
3199 | /* Blocks with reserved pages will never free, skip them. */ |
3200 | if (PageReserved(page)) | |
3201 | continue; | |
3202 | ||
3203 | block_migratetype = get_pageblock_migratetype(page); | |
3204 | ||
3205 | /* If this block is reserved, account for it */ | |
3206 | if (reserve > 0 && block_migratetype == MIGRATE_RESERVE) { | |
3207 | reserve--; | |
3208 | continue; | |
3209 | } | |
3210 | ||
3211 | /* Suitable for reserving if this block is movable */ | |
3212 | if (reserve > 0 && block_migratetype == MIGRATE_MOVABLE) { | |
3213 | set_pageblock_migratetype(page, MIGRATE_RESERVE); | |
3214 | move_freepages_block(zone, page, MIGRATE_RESERVE); | |
3215 | reserve--; | |
3216 | continue; | |
3217 | } | |
3218 | ||
3219 | /* | |
3220 | * If the reserve is met and this is a previous reserved block, | |
3221 | * take it back | |
3222 | */ | |
3223 | if (block_migratetype == MIGRATE_RESERVE) { | |
3224 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); | |
3225 | move_freepages_block(zone, page, MIGRATE_MOVABLE); | |
3226 | } | |
3227 | } | |
3228 | } | |
ac0e5b7a | 3229 | |
1da177e4 LT |
3230 | /* |
3231 | * Initially all pages are reserved - free ones are freed | |
3232 | * up by free_all_bootmem() once the early boot process is | |
3233 | * done. Non-atomic initialization, single-pass. | |
3234 | */ | |
c09b4240 | 3235 | void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, |
a2f3aa02 | 3236 | unsigned long start_pfn, enum memmap_context context) |
1da177e4 | 3237 | { |
1da177e4 | 3238 | struct page *page; |
29751f69 AW |
3239 | unsigned long end_pfn = start_pfn + size; |
3240 | unsigned long pfn; | |
86051ca5 | 3241 | struct zone *z; |
1da177e4 | 3242 | |
22b31eec HD |
3243 | if (highest_memmap_pfn < end_pfn - 1) |
3244 | highest_memmap_pfn = end_pfn - 1; | |
3245 | ||
86051ca5 | 3246 | z = &NODE_DATA(nid)->node_zones[zone]; |
cbe8dd4a | 3247 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { |
a2f3aa02 DH |
3248 | /* |
3249 | * There can be holes in boot-time mem_map[]s | |
3250 | * handed to this function. They do not | |
3251 | * exist on hotplugged memory. | |
3252 | */ | |
3253 | if (context == MEMMAP_EARLY) { | |
3254 | if (!early_pfn_valid(pfn)) | |
3255 | continue; | |
3256 | if (!early_pfn_in_nid(pfn, nid)) | |
3257 | continue; | |
3258 | } | |
d41dee36 AW |
3259 | page = pfn_to_page(pfn); |
3260 | set_page_links(page, zone, nid, pfn); | |
708614e6 | 3261 | mminit_verify_page_links(page, zone, nid, pfn); |
7835e98b | 3262 | init_page_count(page); |
1da177e4 LT |
3263 | reset_page_mapcount(page); |
3264 | SetPageReserved(page); | |
b2a0ac88 MG |
3265 | /* |
3266 | * Mark the block movable so that blocks are reserved for | |
3267 | * movable at startup. This will force kernel allocations | |
3268 | * to reserve their blocks rather than leaking throughout | |
3269 | * the address space during boot when many long-lived | |
56fd56b8 MG |
3270 | * kernel allocations are made. Later some blocks near |
3271 | * the start are marked MIGRATE_RESERVE by | |
3272 | * setup_zone_migrate_reserve() | |
86051ca5 KH |
3273 | * |
3274 | * bitmap is created for zone's valid pfn range. but memmap | |
3275 | * can be created for invalid pages (for alignment) | |
3276 | * check here not to call set_pageblock_migratetype() against | |
3277 | * pfn out of zone. | |
b2a0ac88 | 3278 | */ |
86051ca5 KH |
3279 | if ((z->zone_start_pfn <= pfn) |
3280 | && (pfn < z->zone_start_pfn + z->spanned_pages) | |
3281 | && !(pfn & (pageblock_nr_pages - 1))) | |
56fd56b8 | 3282 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); |
b2a0ac88 | 3283 | |
1da177e4 LT |
3284 | INIT_LIST_HEAD(&page->lru); |
3285 | #ifdef WANT_PAGE_VIRTUAL | |
3286 | /* The shift won't overflow because ZONE_NORMAL is below 4G. */ | |
3287 | if (!is_highmem_idx(zone)) | |
3212c6be | 3288 | set_page_address(page, __va(pfn << PAGE_SHIFT)); |
1da177e4 | 3289 | #endif |
1da177e4 LT |
3290 | } |
3291 | } | |
3292 | ||
1e548deb | 3293 | static void __meminit zone_init_free_lists(struct zone *zone) |
1da177e4 | 3294 | { |
b2a0ac88 MG |
3295 | int order, t; |
3296 | for_each_migratetype_order(order, t) { | |
3297 | INIT_LIST_HEAD(&zone->free_area[order].free_list[t]); | |
1da177e4 LT |
3298 | zone->free_area[order].nr_free = 0; |
3299 | } | |
3300 | } | |
3301 | ||
3302 | #ifndef __HAVE_ARCH_MEMMAP_INIT | |
3303 | #define memmap_init(size, nid, zone, start_pfn) \ | |
a2f3aa02 | 3304 | memmap_init_zone((size), (nid), (zone), (start_pfn), MEMMAP_EARLY) |
1da177e4 LT |
3305 | #endif |
3306 | ||
1d6f4e60 | 3307 | static int zone_batchsize(struct zone *zone) |
e7c8d5c9 | 3308 | { |
3a6be87f | 3309 | #ifdef CONFIG_MMU |
e7c8d5c9 CL |
3310 | int batch; |
3311 | ||
3312 | /* | |
3313 | * The per-cpu-pages pools are set to around 1000th of the | |
ba56e91c | 3314 | * size of the zone. But no more than 1/2 of a meg. |
e7c8d5c9 CL |
3315 | * |
3316 | * OK, so we don't know how big the cache is. So guess. | |
3317 | */ | |
3318 | batch = zone->present_pages / 1024; | |
ba56e91c SR |
3319 | if (batch * PAGE_SIZE > 512 * 1024) |
3320 | batch = (512 * 1024) / PAGE_SIZE; | |
e7c8d5c9 CL |
3321 | batch /= 4; /* We effectively *= 4 below */ |
3322 | if (batch < 1) | |
3323 | batch = 1; | |
3324 | ||
3325 | /* | |
0ceaacc9 NP |
3326 | * Clamp the batch to a 2^n - 1 value. Having a power |
3327 | * of 2 value was found to be more likely to have | |
3328 | * suboptimal cache aliasing properties in some cases. | |
e7c8d5c9 | 3329 | * |
0ceaacc9 NP |
3330 | * For example if 2 tasks are alternately allocating |
3331 | * batches of pages, one task can end up with a lot | |
3332 | * of pages of one half of the possible page colors | |
3333 | * and the other with pages of the other colors. | |
e7c8d5c9 | 3334 | */ |
9155203a | 3335 | batch = rounddown_pow_of_two(batch + batch/2) - 1; |
ba56e91c | 3336 | |
e7c8d5c9 | 3337 | return batch; |
3a6be87f DH |
3338 | |
3339 | #else | |
3340 | /* The deferral and batching of frees should be suppressed under NOMMU | |
3341 | * conditions. | |
3342 | * | |
3343 | * The problem is that NOMMU needs to be able to allocate large chunks | |
3344 | * of contiguous memory as there's no hardware page translation to | |
3345 | * assemble apparent contiguous memory from discontiguous pages. | |
3346 | * | |
3347 | * Queueing large contiguous runs of pages for batching, however, | |
3348 | * causes the pages to actually be freed in smaller chunks. As there | |
3349 | * can be a significant delay between the individual batches being | |
3350 | * recycled, this leads to the once large chunks of space being | |
3351 | * fragmented and becoming unavailable for high-order allocations. | |
3352 | */ | |
3353 | return 0; | |
3354 | #endif | |
e7c8d5c9 CL |
3355 | } |
3356 | ||
b69a7288 | 3357 | static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch) |
2caaad41 CL |
3358 | { |
3359 | struct per_cpu_pages *pcp; | |
5f8dcc21 | 3360 | int migratetype; |
2caaad41 | 3361 | |
1c6fe946 MD |
3362 | memset(p, 0, sizeof(*p)); |
3363 | ||
3dfa5721 | 3364 | pcp = &p->pcp; |
2caaad41 | 3365 | pcp->count = 0; |
2caaad41 CL |
3366 | pcp->high = 6 * batch; |
3367 | pcp->batch = max(1UL, 1 * batch); | |
5f8dcc21 MG |
3368 | for (migratetype = 0; migratetype < MIGRATE_PCPTYPES; migratetype++) |
3369 | INIT_LIST_HEAD(&pcp->lists[migratetype]); | |
2caaad41 CL |
3370 | } |
3371 | ||
8ad4b1fb RS |
3372 | /* |
3373 | * setup_pagelist_highmark() sets the high water mark for hot per_cpu_pagelist | |
3374 | * to the value high for the pageset p. | |
3375 | */ | |
3376 | ||
3377 | static void setup_pagelist_highmark(struct per_cpu_pageset *p, | |
3378 | unsigned long high) | |
3379 | { | |
3380 | struct per_cpu_pages *pcp; | |
3381 | ||
3dfa5721 | 3382 | pcp = &p->pcp; |
8ad4b1fb RS |
3383 | pcp->high = high; |
3384 | pcp->batch = max(1UL, high/4); | |
3385 | if ((high/4) > (PAGE_SHIFT * 8)) | |
3386 | pcp->batch = PAGE_SHIFT * 8; | |
3387 | } | |
3388 | ||
319774e2 WF |
3389 | static __meminit void setup_zone_pageset(struct zone *zone) |
3390 | { | |
3391 | int cpu; | |
3392 | ||
3393 | zone->pageset = alloc_percpu(struct per_cpu_pageset); | |
3394 | ||
3395 | for_each_possible_cpu(cpu) { | |
3396 | struct per_cpu_pageset *pcp = per_cpu_ptr(zone->pageset, cpu); | |
3397 | ||
3398 | setup_pageset(pcp, zone_batchsize(zone)); | |
3399 | ||
3400 | if (percpu_pagelist_fraction) | |
3401 | setup_pagelist_highmark(pcp, | |
3402 | (zone->present_pages / | |
3403 | percpu_pagelist_fraction)); | |
3404 | } | |
3405 | } | |
3406 | ||
2caaad41 | 3407 | /* |
99dcc3e5 CL |
3408 | * Allocate per cpu pagesets and initialize them. |
3409 | * Before this call only boot pagesets were available. | |
e7c8d5c9 | 3410 | */ |
99dcc3e5 | 3411 | void __init setup_per_cpu_pageset(void) |
e7c8d5c9 | 3412 | { |
99dcc3e5 | 3413 | struct zone *zone; |
e7c8d5c9 | 3414 | |
319774e2 WF |
3415 | for_each_populated_zone(zone) |
3416 | setup_zone_pageset(zone); | |
e7c8d5c9 CL |
3417 | } |
3418 | ||
577a32f6 | 3419 | static noinline __init_refok |
cca448fe | 3420 | int zone_wait_table_init(struct zone *zone, unsigned long zone_size_pages) |
ed8ece2e DH |
3421 | { |
3422 | int i; | |
3423 | struct pglist_data *pgdat = zone->zone_pgdat; | |
cca448fe | 3424 | size_t alloc_size; |
ed8ece2e DH |
3425 | |
3426 | /* | |
3427 | * The per-page waitqueue mechanism uses hashed waitqueues | |
3428 | * per zone. | |
3429 | */ | |
02b694de YG |
3430 | zone->wait_table_hash_nr_entries = |
3431 | wait_table_hash_nr_entries(zone_size_pages); | |
3432 | zone->wait_table_bits = | |
3433 | wait_table_bits(zone->wait_table_hash_nr_entries); | |
cca448fe YG |
3434 | alloc_size = zone->wait_table_hash_nr_entries |
3435 | * sizeof(wait_queue_head_t); | |
3436 | ||
cd94b9db | 3437 | if (!slab_is_available()) { |
cca448fe YG |
3438 | zone->wait_table = (wait_queue_head_t *) |
3439 | alloc_bootmem_node(pgdat, alloc_size); | |
3440 | } else { | |
3441 | /* | |
3442 | * This case means that a zone whose size was 0 gets new memory | |
3443 | * via memory hot-add. | |
3444 | * But it may be the case that a new node was hot-added. In | |
3445 | * this case vmalloc() will not be able to use this new node's | |
3446 | * memory - this wait_table must be initialized to use this new | |
3447 | * node itself as well. | |
3448 | * To use this new node's memory, further consideration will be | |
3449 | * necessary. | |
3450 | */ | |
8691f3a7 | 3451 | zone->wait_table = vmalloc(alloc_size); |
cca448fe YG |
3452 | } |
3453 | if (!zone->wait_table) | |
3454 | return -ENOMEM; | |
ed8ece2e | 3455 | |
02b694de | 3456 | for(i = 0; i < zone->wait_table_hash_nr_entries; ++i) |
ed8ece2e | 3457 | init_waitqueue_head(zone->wait_table + i); |
cca448fe YG |
3458 | |
3459 | return 0; | |
ed8ece2e DH |
3460 | } |
3461 | ||
112067f0 SL |
3462 | static int __zone_pcp_update(void *data) |
3463 | { | |
3464 | struct zone *zone = data; | |
3465 | int cpu; | |
3466 | unsigned long batch = zone_batchsize(zone), flags; | |
3467 | ||
2d30a1f6 | 3468 | for_each_possible_cpu(cpu) { |
112067f0 SL |
3469 | struct per_cpu_pageset *pset; |
3470 | struct per_cpu_pages *pcp; | |
3471 | ||
99dcc3e5 | 3472 | pset = per_cpu_ptr(zone->pageset, cpu); |
112067f0 SL |
3473 | pcp = &pset->pcp; |
3474 | ||
3475 | local_irq_save(flags); | |
5f8dcc21 | 3476 | free_pcppages_bulk(zone, pcp->count, pcp); |
112067f0 SL |
3477 | setup_pageset(pset, batch); |
3478 | local_irq_restore(flags); | |
3479 | } | |
3480 | return 0; | |
3481 | } | |
3482 | ||
3483 | void zone_pcp_update(struct zone *zone) | |
3484 | { | |
3485 | stop_machine(__zone_pcp_update, zone, NULL); | |
3486 | } | |
3487 | ||
c09b4240 | 3488 | static __meminit void zone_pcp_init(struct zone *zone) |
ed8ece2e | 3489 | { |
99dcc3e5 CL |
3490 | /* |
3491 | * per cpu subsystem is not up at this point. The following code | |
3492 | * relies on the ability of the linker to provide the | |
3493 | * offset of a (static) per cpu variable into the per cpu area. | |
3494 | */ | |
3495 | zone->pageset = &boot_pageset; | |
ed8ece2e | 3496 | |
f5335c0f | 3497 | if (zone->present_pages) |
99dcc3e5 CL |
3498 | printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%u\n", |
3499 | zone->name, zone->present_pages, | |
3500 | zone_batchsize(zone)); | |
ed8ece2e DH |
3501 | } |
3502 | ||
718127cc YG |
3503 | __meminit int init_currently_empty_zone(struct zone *zone, |
3504 | unsigned long zone_start_pfn, | |
a2f3aa02 DH |
3505 | unsigned long size, |
3506 | enum memmap_context context) | |
ed8ece2e DH |
3507 | { |
3508 | struct pglist_data *pgdat = zone->zone_pgdat; | |
cca448fe YG |
3509 | int ret; |
3510 | ret = zone_wait_table_init(zone, size); | |
3511 | if (ret) | |
3512 | return ret; | |
ed8ece2e DH |
3513 | pgdat->nr_zones = zone_idx(zone) + 1; |
3514 | ||
ed8ece2e DH |
3515 | zone->zone_start_pfn = zone_start_pfn; |
3516 | ||
708614e6 MG |
3517 | mminit_dprintk(MMINIT_TRACE, "memmap_init", |
3518 | "Initialising map node %d zone %lu pfns %lu -> %lu\n", | |
3519 | pgdat->node_id, | |
3520 | (unsigned long)zone_idx(zone), | |
3521 | zone_start_pfn, (zone_start_pfn + size)); | |
3522 | ||
1e548deb | 3523 | zone_init_free_lists(zone); |
718127cc YG |
3524 | |
3525 | return 0; | |
ed8ece2e DH |
3526 | } |
3527 | ||
c713216d MG |
3528 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
3529 | /* | |
3530 | * Basic iterator support. Return the first range of PFNs for a node | |
3531 | * Note: nid == MAX_NUMNODES returns first region regardless of node | |
3532 | */ | |
a3142c8e | 3533 | static int __meminit first_active_region_index_in_nid(int nid) |
c713216d MG |
3534 | { |
3535 | int i; | |
3536 | ||
3537 | for (i = 0; i < nr_nodemap_entries; i++) | |
3538 | if (nid == MAX_NUMNODES || early_node_map[i].nid == nid) | |
3539 | return i; | |
3540 | ||
3541 | return -1; | |
3542 | } | |
3543 | ||
3544 | /* | |
3545 | * Basic iterator support. Return the next active range of PFNs for a node | |
183ff22b | 3546 | * Note: nid == MAX_NUMNODES returns next region regardless of node |
c713216d | 3547 | */ |
a3142c8e | 3548 | static int __meminit next_active_region_index_in_nid(int index, int nid) |
c713216d MG |
3549 | { |
3550 | for (index = index + 1; index < nr_nodemap_entries; index++) | |
3551 | if (nid == MAX_NUMNODES || early_node_map[index].nid == nid) | |
3552 | return index; | |
3553 | ||
3554 | return -1; | |
3555 | } | |
3556 | ||
3557 | #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID | |
3558 | /* | |
3559 | * Required by SPARSEMEM. Given a PFN, return what node the PFN is on. | |
3560 | * Architectures may implement their own version but if add_active_range() | |
3561 | * was used and there are no special requirements, this is a convenient | |
3562 | * alternative | |
3563 | */ | |
f2dbcfa7 | 3564 | int __meminit __early_pfn_to_nid(unsigned long pfn) |
c713216d MG |
3565 | { |
3566 | int i; | |
3567 | ||
3568 | for (i = 0; i < nr_nodemap_entries; i++) { | |
3569 | unsigned long start_pfn = early_node_map[i].start_pfn; | |
3570 | unsigned long end_pfn = early_node_map[i].end_pfn; | |
3571 | ||
3572 | if (start_pfn <= pfn && pfn < end_pfn) | |
3573 | return early_node_map[i].nid; | |
3574 | } | |
cc2559bc KH |
3575 | /* This is a memory hole */ |
3576 | return -1; | |
c713216d MG |
3577 | } |
3578 | #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ | |
3579 | ||
f2dbcfa7 KH |
3580 | int __meminit early_pfn_to_nid(unsigned long pfn) |
3581 | { | |
cc2559bc KH |
3582 | int nid; |
3583 | ||
3584 | nid = __early_pfn_to_nid(pfn); | |
3585 | if (nid >= 0) | |
3586 | return nid; | |
3587 | /* just returns 0 */ | |
3588 | return 0; | |
f2dbcfa7 KH |
3589 | } |
3590 | ||
cc2559bc KH |
3591 | #ifdef CONFIG_NODES_SPAN_OTHER_NODES |
3592 | bool __meminit early_pfn_in_nid(unsigned long pfn, int node) | |
3593 | { | |
3594 | int nid; | |
3595 | ||
3596 | nid = __early_pfn_to_nid(pfn); | |
3597 | if (nid >= 0 && nid != node) | |
3598 | return false; | |
3599 | return true; | |
3600 | } | |
3601 | #endif | |
f2dbcfa7 | 3602 | |
c713216d MG |
3603 | /* Basic iterator support to walk early_node_map[] */ |
3604 | #define for_each_active_range_index_in_nid(i, nid) \ | |
3605 | for (i = first_active_region_index_in_nid(nid); i != -1; \ | |
3606 | i = next_active_region_index_in_nid(i, nid)) | |
3607 | ||
3608 | /** | |
3609 | * free_bootmem_with_active_regions - Call free_bootmem_node for each active range | |
88ca3b94 RD |
3610 | * @nid: The node to free memory on. If MAX_NUMNODES, all nodes are freed. |
3611 | * @max_low_pfn: The highest PFN that will be passed to free_bootmem_node | |
c713216d MG |
3612 | * |
3613 | * If an architecture guarantees that all ranges registered with | |
3614 | * add_active_ranges() contain no holes and may be freed, this | |
3615 | * this function may be used instead of calling free_bootmem() manually. | |
3616 | */ | |
3617 | void __init free_bootmem_with_active_regions(int nid, | |
3618 | unsigned long max_low_pfn) | |
3619 | { | |
3620 | int i; | |
3621 | ||
3622 | for_each_active_range_index_in_nid(i, nid) { | |
3623 | unsigned long size_pages = 0; | |
3624 | unsigned long end_pfn = early_node_map[i].end_pfn; | |
3625 | ||
3626 | if (early_node_map[i].start_pfn >= max_low_pfn) | |
3627 | continue; | |
3628 | ||
3629 | if (end_pfn > max_low_pfn) | |
3630 | end_pfn = max_low_pfn; | |
3631 | ||
3632 | size_pages = end_pfn - early_node_map[i].start_pfn; | |
3633 | free_bootmem_node(NODE_DATA(early_node_map[i].nid), | |
3634 | PFN_PHYS(early_node_map[i].start_pfn), | |
3635 | size_pages << PAGE_SHIFT); | |
3636 | } | |
3637 | } | |
3638 | ||
08677214 YL |
3639 | int __init add_from_early_node_map(struct range *range, int az, |
3640 | int nr_range, int nid) | |
3641 | { | |
3642 | int i; | |
3643 | u64 start, end; | |
3644 | ||
3645 | /* need to go over early_node_map to find out good range for node */ | |
3646 | for_each_active_range_index_in_nid(i, nid) { | |
3647 | start = early_node_map[i].start_pfn; | |
3648 | end = early_node_map[i].end_pfn; | |
3649 | nr_range = add_range(range, az, nr_range, start, end); | |
3650 | } | |
3651 | return nr_range; | |
3652 | } | |
3653 | ||
2ee78f7b | 3654 | #ifdef CONFIG_NO_BOOTMEM |
08677214 YL |
3655 | void * __init __alloc_memory_core_early(int nid, u64 size, u64 align, |
3656 | u64 goal, u64 limit) | |
3657 | { | |
3658 | int i; | |
3659 | void *ptr; | |
3660 | ||
b8ab9f82 YL |
3661 | if (limit > get_max_mapped()) |
3662 | limit = get_max_mapped(); | |
3663 | ||
08677214 YL |
3664 | /* need to go over early_node_map to find out good range for node */ |
3665 | for_each_active_range_index_in_nid(i, nid) { | |
3666 | u64 addr; | |
3667 | u64 ei_start, ei_last; | |
3668 | ||
3669 | ei_last = early_node_map[i].end_pfn; | |
3670 | ei_last <<= PAGE_SHIFT; | |
3671 | ei_start = early_node_map[i].start_pfn; | |
3672 | ei_start <<= PAGE_SHIFT; | |
3673 | addr = find_early_area(ei_start, ei_last, | |
3674 | goal, limit, size, align); | |
3675 | ||
3676 | if (addr == -1ULL) | |
3677 | continue; | |
3678 | ||
3679 | #if 0 | |
3680 | printk(KERN_DEBUG "alloc (nid=%d %llx - %llx) (%llx - %llx) %llx %llx => %llx\n", | |
3681 | nid, | |
3682 | ei_start, ei_last, goal, limit, size, | |
3683 | align, addr); | |
3684 | #endif | |
3685 | ||
3686 | ptr = phys_to_virt(addr); | |
3687 | memset(ptr, 0, size); | |
3688 | reserve_early_without_check(addr, addr + size, "BOOTMEM"); | |
9078370c CM |
3689 | /* |
3690 | * The min_count is set to 0 so that bootmem allocated blocks | |
3691 | * are never reported as leaks. | |
3692 | */ | |
3693 | kmemleak_alloc(ptr, size, 0, 0); | |
08677214 YL |
3694 | return ptr; |
3695 | } | |
3696 | ||
3697 | return NULL; | |
3698 | } | |
2ee78f7b | 3699 | #endif |
08677214 YL |
3700 | |
3701 | ||
b5bc6c0e YL |
3702 | void __init work_with_active_regions(int nid, work_fn_t work_fn, void *data) |
3703 | { | |
3704 | int i; | |
d52d53b8 | 3705 | int ret; |
b5bc6c0e | 3706 | |
d52d53b8 YL |
3707 | for_each_active_range_index_in_nid(i, nid) { |
3708 | ret = work_fn(early_node_map[i].start_pfn, | |
3709 | early_node_map[i].end_pfn, data); | |
3710 | if (ret) | |
3711 | break; | |
3712 | } | |
b5bc6c0e | 3713 | } |
c713216d MG |
3714 | /** |
3715 | * sparse_memory_present_with_active_regions - Call memory_present for each active range | |
88ca3b94 | 3716 | * @nid: The node to call memory_present for. If MAX_NUMNODES, all nodes will be used. |
c713216d MG |
3717 | * |
3718 | * If an architecture guarantees that all ranges registered with | |
3719 | * add_active_ranges() contain no holes and may be freed, this | |
88ca3b94 | 3720 | * function may be used instead of calling memory_present() manually. |
c713216d MG |
3721 | */ |
3722 | void __init sparse_memory_present_with_active_regions(int nid) | |
3723 | { | |
3724 | int i; | |
3725 | ||
3726 | for_each_active_range_index_in_nid(i, nid) | |
3727 | memory_present(early_node_map[i].nid, | |
3728 | early_node_map[i].start_pfn, | |
3729 | early_node_map[i].end_pfn); | |
3730 | } | |
3731 | ||
3732 | /** | |
3733 | * get_pfn_range_for_nid - Return the start and end page frames for a node | |
88ca3b94 RD |
3734 | * @nid: The nid to return the range for. If MAX_NUMNODES, the min and max PFN are returned. |
3735 | * @start_pfn: Passed by reference. On return, it will have the node start_pfn. | |
3736 | * @end_pfn: Passed by reference. On return, it will have the node end_pfn. | |
c713216d MG |
3737 | * |
3738 | * It returns the start and end page frame of a node based on information | |
3739 | * provided by an arch calling add_active_range(). If called for a node | |
3740 | * with no available memory, a warning is printed and the start and end | |
88ca3b94 | 3741 | * PFNs will be 0. |
c713216d | 3742 | */ |
a3142c8e | 3743 | void __meminit get_pfn_range_for_nid(unsigned int nid, |
c713216d MG |
3744 | unsigned long *start_pfn, unsigned long *end_pfn) |
3745 | { | |
3746 | int i; | |
3747 | *start_pfn = -1UL; | |
3748 | *end_pfn = 0; | |
3749 | ||
3750 | for_each_active_range_index_in_nid(i, nid) { | |
3751 | *start_pfn = min(*start_pfn, early_node_map[i].start_pfn); | |
3752 | *end_pfn = max(*end_pfn, early_node_map[i].end_pfn); | |
3753 | } | |
3754 | ||
633c0666 | 3755 | if (*start_pfn == -1UL) |
c713216d | 3756 | *start_pfn = 0; |
c713216d MG |
3757 | } |
3758 | ||
2a1e274a MG |
3759 | /* |
3760 | * This finds a zone that can be used for ZONE_MOVABLE pages. The | |
3761 | * assumption is made that zones within a node are ordered in monotonic | |
3762 | * increasing memory addresses so that the "highest" populated zone is used | |
3763 | */ | |
b69a7288 | 3764 | static void __init find_usable_zone_for_movable(void) |
2a1e274a MG |
3765 | { |
3766 | int zone_index; | |
3767 | for (zone_index = MAX_NR_ZONES - 1; zone_index >= 0; zone_index--) { | |
3768 | if (zone_index == ZONE_MOVABLE) | |
3769 | continue; | |
3770 | ||
3771 | if (arch_zone_highest_possible_pfn[zone_index] > | |
3772 | arch_zone_lowest_possible_pfn[zone_index]) | |
3773 | break; | |
3774 | } | |
3775 | ||
3776 | VM_BUG_ON(zone_index == -1); | |
3777 | movable_zone = zone_index; | |
3778 | } | |
3779 | ||
3780 | /* | |
3781 | * The zone ranges provided by the architecture do not include ZONE_MOVABLE | |
3782 | * because it is sized independant of architecture. Unlike the other zones, | |
3783 | * the starting point for ZONE_MOVABLE is not fixed. It may be different | |
3784 | * in each node depending on the size of each node and how evenly kernelcore | |
3785 | * is distributed. This helper function adjusts the zone ranges | |
3786 | * provided by the architecture for a given node by using the end of the | |
3787 | * highest usable zone for ZONE_MOVABLE. This preserves the assumption that | |
3788 | * zones within a node are in order of monotonic increases memory addresses | |
3789 | */ | |
b69a7288 | 3790 | static void __meminit adjust_zone_range_for_zone_movable(int nid, |
2a1e274a MG |
3791 | unsigned long zone_type, |
3792 | unsigned long node_start_pfn, | |
3793 | unsigned long node_end_pfn, | |
3794 | unsigned long *zone_start_pfn, | |
3795 | unsigned long *zone_end_pfn) | |
3796 | { | |
3797 | /* Only adjust if ZONE_MOVABLE is on this node */ | |
3798 | if (zone_movable_pfn[nid]) { | |
3799 | /* Size ZONE_MOVABLE */ | |
3800 | if (zone_type == ZONE_MOVABLE) { | |
3801 | *zone_start_pfn = zone_movable_pfn[nid]; | |
3802 | *zone_end_pfn = min(node_end_pfn, | |
3803 | arch_zone_highest_possible_pfn[movable_zone]); | |
3804 | ||
3805 | /* Adjust for ZONE_MOVABLE starting within this range */ | |
3806 | } else if (*zone_start_pfn < zone_movable_pfn[nid] && | |
3807 | *zone_end_pfn > zone_movable_pfn[nid]) { | |
3808 | *zone_end_pfn = zone_movable_pfn[nid]; | |
3809 | ||
3810 | /* Check if this whole range is within ZONE_MOVABLE */ | |
3811 | } else if (*zone_start_pfn >= zone_movable_pfn[nid]) | |
3812 | *zone_start_pfn = *zone_end_pfn; | |
3813 | } | |
3814 | } | |
3815 | ||
c713216d MG |
3816 | /* |
3817 | * Return the number of pages a zone spans in a node, including holes | |
3818 | * present_pages = zone_spanned_pages_in_node() - zone_absent_pages_in_node() | |
3819 | */ | |
6ea6e688 | 3820 | static unsigned long __meminit zone_spanned_pages_in_node(int nid, |
c713216d MG |
3821 | unsigned long zone_type, |
3822 | unsigned long *ignored) | |
3823 | { | |
3824 | unsigned long node_start_pfn, node_end_pfn; | |
3825 | unsigned long zone_start_pfn, zone_end_pfn; | |
3826 | ||
3827 | /* Get the start and end of the node and zone */ | |
3828 | get_pfn_range_for_nid(nid, &node_start_pfn, &node_end_pfn); | |
3829 | zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type]; | |
3830 | zone_end_pfn = arch_zone_highest_possible_pfn[zone_type]; | |
2a1e274a MG |
3831 | adjust_zone_range_for_zone_movable(nid, zone_type, |
3832 | node_start_pfn, node_end_pfn, | |
3833 | &zone_start_pfn, &zone_end_pfn); | |
c713216d MG |
3834 | |
3835 | /* Check that this node has pages within the zone's required range */ | |
3836 | if (zone_end_pfn < node_start_pfn || zone_start_pfn > node_end_pfn) | |
3837 | return 0; | |
3838 | ||
3839 | /* Move the zone boundaries inside the node if necessary */ | |
3840 | zone_end_pfn = min(zone_end_pfn, node_end_pfn); | |
3841 | zone_start_pfn = max(zone_start_pfn, node_start_pfn); | |
3842 | ||
3843 | /* Return the spanned pages */ | |
3844 | return zone_end_pfn - zone_start_pfn; | |
3845 | } | |
3846 | ||
3847 | /* | |
3848 | * Return the number of holes in a range on a node. If nid is MAX_NUMNODES, | |
88ca3b94 | 3849 | * then all holes in the requested range will be accounted for. |
c713216d | 3850 | */ |
32996250 | 3851 | unsigned long __meminit __absent_pages_in_range(int nid, |
c713216d MG |
3852 | unsigned long range_start_pfn, |
3853 | unsigned long range_end_pfn) | |
3854 | { | |
3855 | int i = 0; | |
3856 | unsigned long prev_end_pfn = 0, hole_pages = 0; | |
3857 | unsigned long start_pfn; | |
3858 | ||
3859 | /* Find the end_pfn of the first active range of pfns in the node */ | |
3860 | i = first_active_region_index_in_nid(nid); | |
3861 | if (i == -1) | |
3862 | return 0; | |
3863 | ||
b5445f95 MG |
3864 | prev_end_pfn = min(early_node_map[i].start_pfn, range_end_pfn); |
3865 | ||
9c7cd687 MG |
3866 | /* Account for ranges before physical memory on this node */ |
3867 | if (early_node_map[i].start_pfn > range_start_pfn) | |
b5445f95 | 3868 | hole_pages = prev_end_pfn - range_start_pfn; |
c713216d MG |
3869 | |
3870 | /* Find all holes for the zone within the node */ | |
3871 | for (; i != -1; i = next_active_region_index_in_nid(i, nid)) { | |
3872 | ||
3873 | /* No need to continue if prev_end_pfn is outside the zone */ | |
3874 | if (prev_end_pfn >= range_end_pfn) | |
3875 | break; | |
3876 | ||
3877 | /* Make sure the end of the zone is not within the hole */ | |
3878 | start_pfn = min(early_node_map[i].start_pfn, range_end_pfn); | |
3879 | prev_end_pfn = max(prev_end_pfn, range_start_pfn); | |
3880 | ||
3881 | /* Update the hole size cound and move on */ | |
3882 | if (start_pfn > range_start_pfn) { | |
3883 | BUG_ON(prev_end_pfn > start_pfn); | |
3884 | hole_pages += start_pfn - prev_end_pfn; | |
3885 | } | |
3886 | prev_end_pfn = early_node_map[i].end_pfn; | |
3887 | } | |
3888 | ||
9c7cd687 MG |
3889 | /* Account for ranges past physical memory on this node */ |
3890 | if (range_end_pfn > prev_end_pfn) | |
0c6cb974 | 3891 | hole_pages += range_end_pfn - |
9c7cd687 MG |
3892 | max(range_start_pfn, prev_end_pfn); |
3893 | ||
c713216d MG |
3894 | return hole_pages; |
3895 | } | |
3896 | ||
3897 | /** | |
3898 | * absent_pages_in_range - Return number of page frames in holes within a range | |
3899 | * @start_pfn: The start PFN to start searching for holes | |
3900 | * @end_pfn: The end PFN to stop searching for holes | |
3901 | * | |
88ca3b94 | 3902 | * It returns the number of pages frames in memory holes within a range. |
c713216d MG |
3903 | */ |
3904 | unsigned long __init absent_pages_in_range(unsigned long start_pfn, | |
3905 | unsigned long end_pfn) | |
3906 | { | |
3907 | return __absent_pages_in_range(MAX_NUMNODES, start_pfn, end_pfn); | |
3908 | } | |
3909 | ||
3910 | /* Return the number of page frames in holes in a zone on a node */ | |
6ea6e688 | 3911 | static unsigned long __meminit zone_absent_pages_in_node(int nid, |
c713216d MG |
3912 | unsigned long zone_type, |
3913 | unsigned long *ignored) | |
3914 | { | |
9c7cd687 MG |
3915 | unsigned long node_start_pfn, node_end_pfn; |
3916 | unsigned long zone_start_pfn, zone_end_pfn; | |
3917 | ||
3918 | get_pfn_range_for_nid(nid, &node_start_pfn, &node_end_pfn); | |
3919 | zone_start_pfn = max(arch_zone_lowest_possible_pfn[zone_type], | |
3920 | node_start_pfn); | |
3921 | zone_end_pfn = min(arch_zone_highest_possible_pfn[zone_type], | |
3922 | node_end_pfn); | |
3923 | ||
2a1e274a MG |
3924 | adjust_zone_range_for_zone_movable(nid, zone_type, |
3925 | node_start_pfn, node_end_pfn, | |
3926 | &zone_start_pfn, &zone_end_pfn); | |
9c7cd687 | 3927 | return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); |
c713216d | 3928 | } |
0e0b864e | 3929 | |
c713216d | 3930 | #else |
6ea6e688 | 3931 | static inline unsigned long __meminit zone_spanned_pages_in_node(int nid, |
c713216d MG |
3932 | unsigned long zone_type, |
3933 | unsigned long *zones_size) | |
3934 | { | |
3935 | return zones_size[zone_type]; | |
3936 | } | |
3937 | ||
6ea6e688 | 3938 | static inline unsigned long __meminit zone_absent_pages_in_node(int nid, |
c713216d MG |
3939 | unsigned long zone_type, |
3940 | unsigned long *zholes_size) | |
3941 | { | |
3942 | if (!zholes_size) | |
3943 | return 0; | |
3944 | ||
3945 | return zholes_size[zone_type]; | |
3946 | } | |
0e0b864e | 3947 | |
c713216d MG |
3948 | #endif |
3949 | ||
a3142c8e | 3950 | static void __meminit calculate_node_totalpages(struct pglist_data *pgdat, |
c713216d MG |
3951 | unsigned long *zones_size, unsigned long *zholes_size) |
3952 | { | |
3953 | unsigned long realtotalpages, totalpages = 0; | |
3954 | enum zone_type i; | |
3955 | ||
3956 | for (i = 0; i < MAX_NR_ZONES; i++) | |
3957 | totalpages += zone_spanned_pages_in_node(pgdat->node_id, i, | |
3958 | zones_size); | |
3959 | pgdat->node_spanned_pages = totalpages; | |
3960 | ||
3961 | realtotalpages = totalpages; | |
3962 | for (i = 0; i < MAX_NR_ZONES; i++) | |
3963 | realtotalpages -= | |
3964 | zone_absent_pages_in_node(pgdat->node_id, i, | |
3965 | zholes_size); | |
3966 | pgdat->node_present_pages = realtotalpages; | |
3967 | printk(KERN_DEBUG "On node %d totalpages: %lu\n", pgdat->node_id, | |
3968 | realtotalpages); | |
3969 | } | |
3970 | ||
835c134e MG |
3971 | #ifndef CONFIG_SPARSEMEM |
3972 | /* | |
3973 | * Calculate the size of the zone->blockflags rounded to an unsigned long | |
d9c23400 MG |
3974 | * Start by making sure zonesize is a multiple of pageblock_order by rounding |
3975 | * up. Then use 1 NR_PAGEBLOCK_BITS worth of bits per pageblock, finally | |
835c134e MG |
3976 | * round what is now in bits to nearest long in bits, then return it in |
3977 | * bytes. | |
3978 | */ | |
3979 | static unsigned long __init usemap_size(unsigned long zonesize) | |
3980 | { | |
3981 | unsigned long usemapsize; | |
3982 | ||
d9c23400 MG |
3983 | usemapsize = roundup(zonesize, pageblock_nr_pages); |
3984 | usemapsize = usemapsize >> pageblock_order; | |
835c134e MG |
3985 | usemapsize *= NR_PAGEBLOCK_BITS; |
3986 | usemapsize = roundup(usemapsize, 8 * sizeof(unsigned long)); | |
3987 | ||
3988 | return usemapsize / 8; | |
3989 | } | |
3990 | ||
3991 | static void __init setup_usemap(struct pglist_data *pgdat, | |
3992 | struct zone *zone, unsigned long zonesize) | |
3993 | { | |
3994 | unsigned long usemapsize = usemap_size(zonesize); | |
3995 | zone->pageblock_flags = NULL; | |
58a01a45 | 3996 | if (usemapsize) |
835c134e | 3997 | zone->pageblock_flags = alloc_bootmem_node(pgdat, usemapsize); |
835c134e MG |
3998 | } |
3999 | #else | |
4000 | static void inline setup_usemap(struct pglist_data *pgdat, | |
4001 | struct zone *zone, unsigned long zonesize) {} | |
4002 | #endif /* CONFIG_SPARSEMEM */ | |
4003 | ||
d9c23400 | 4004 | #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE |
ba72cb8c MG |
4005 | |
4006 | /* Return a sensible default order for the pageblock size. */ | |
4007 | static inline int pageblock_default_order(void) | |
4008 | { | |
4009 | if (HPAGE_SHIFT > PAGE_SHIFT) | |
4010 | return HUGETLB_PAGE_ORDER; | |
4011 | ||
4012 | return MAX_ORDER-1; | |
4013 | } | |
4014 | ||
d9c23400 MG |
4015 | /* Initialise the number of pages represented by NR_PAGEBLOCK_BITS */ |
4016 | static inline void __init set_pageblock_order(unsigned int order) | |
4017 | { | |
4018 | /* Check that pageblock_nr_pages has not already been setup */ | |
4019 | if (pageblock_order) | |
4020 | return; | |
4021 | ||
4022 | /* | |
4023 | * Assume the largest contiguous order of interest is a huge page. | |
4024 | * This value may be variable depending on boot parameters on IA64 | |
4025 | */ | |
4026 | pageblock_order = order; | |
4027 | } | |
4028 | #else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
4029 | ||
ba72cb8c MG |
4030 | /* |
4031 | * When CONFIG_HUGETLB_PAGE_SIZE_VARIABLE is not set, set_pageblock_order() | |
4032 | * and pageblock_default_order() are unused as pageblock_order is set | |
4033 | * at compile-time. See include/linux/pageblock-flags.h for the values of | |
4034 | * pageblock_order based on the kernel config | |
4035 | */ | |
4036 | static inline int pageblock_default_order(unsigned int order) | |
4037 | { | |
4038 | return MAX_ORDER-1; | |
4039 | } | |
d9c23400 MG |
4040 | #define set_pageblock_order(x) do {} while (0) |
4041 | ||
4042 | #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ | |
4043 | ||
1da177e4 LT |
4044 | /* |
4045 | * Set up the zone data structures: | |
4046 | * - mark all pages reserved | |
4047 | * - mark all memory queues empty | |
4048 | * - clear the memory bitmaps | |
4049 | */ | |
b5a0e011 | 4050 | static void __paginginit free_area_init_core(struct pglist_data *pgdat, |
1da177e4 LT |
4051 | unsigned long *zones_size, unsigned long *zholes_size) |
4052 | { | |
2f1b6248 | 4053 | enum zone_type j; |
ed8ece2e | 4054 | int nid = pgdat->node_id; |
1da177e4 | 4055 | unsigned long zone_start_pfn = pgdat->node_start_pfn; |
718127cc | 4056 | int ret; |
1da177e4 | 4057 | |
208d54e5 | 4058 | pgdat_resize_init(pgdat); |
1da177e4 LT |
4059 | pgdat->nr_zones = 0; |
4060 | init_waitqueue_head(&pgdat->kswapd_wait); | |
4061 | pgdat->kswapd_max_order = 0; | |
52d4b9ac | 4062 | pgdat_page_cgroup_init(pgdat); |
1da177e4 LT |
4063 | |
4064 | for (j = 0; j < MAX_NR_ZONES; j++) { | |
4065 | struct zone *zone = pgdat->node_zones + j; | |
0e0b864e | 4066 | unsigned long size, realsize, memmap_pages; |
b69408e8 | 4067 | enum lru_list l; |
1da177e4 | 4068 | |
c713216d MG |
4069 | size = zone_spanned_pages_in_node(nid, j, zones_size); |
4070 | realsize = size - zone_absent_pages_in_node(nid, j, | |
4071 | zholes_size); | |
1da177e4 | 4072 | |
0e0b864e MG |
4073 | /* |
4074 | * Adjust realsize so that it accounts for how much memory | |
4075 | * is used by this zone for memmap. This affects the watermark | |
4076 | * and per-cpu initialisations | |
4077 | */ | |
f7232154 JW |
4078 | memmap_pages = |
4079 | PAGE_ALIGN(size * sizeof(struct page)) >> PAGE_SHIFT; | |
0e0b864e MG |
4080 | if (realsize >= memmap_pages) { |
4081 | realsize -= memmap_pages; | |
5594c8c8 YL |
4082 | if (memmap_pages) |
4083 | printk(KERN_DEBUG | |
4084 | " %s zone: %lu pages used for memmap\n", | |
4085 | zone_names[j], memmap_pages); | |
0e0b864e MG |
4086 | } else |
4087 | printk(KERN_WARNING | |
4088 | " %s zone: %lu pages exceeds realsize %lu\n", | |
4089 | zone_names[j], memmap_pages, realsize); | |
4090 | ||
6267276f CL |
4091 | /* Account for reserved pages */ |
4092 | if (j == 0 && realsize > dma_reserve) { | |
0e0b864e | 4093 | realsize -= dma_reserve; |
d903ef9f | 4094 | printk(KERN_DEBUG " %s zone: %lu pages reserved\n", |
6267276f | 4095 | zone_names[0], dma_reserve); |
0e0b864e MG |
4096 | } |
4097 | ||
98d2b0eb | 4098 | if (!is_highmem_idx(j)) |
1da177e4 LT |
4099 | nr_kernel_pages += realsize; |
4100 | nr_all_pages += realsize; | |
4101 | ||
4102 | zone->spanned_pages = size; | |
4103 | zone->present_pages = realsize; | |
9614634f | 4104 | #ifdef CONFIG_NUMA |
d5f541ed | 4105 | zone->node = nid; |
8417bba4 | 4106 | zone->min_unmapped_pages = (realsize*sysctl_min_unmapped_ratio) |
9614634f | 4107 | / 100; |
0ff38490 | 4108 | zone->min_slab_pages = (realsize * sysctl_min_slab_ratio) / 100; |
9614634f | 4109 | #endif |
1da177e4 LT |
4110 | zone->name = zone_names[j]; |
4111 | spin_lock_init(&zone->lock); | |
4112 | spin_lock_init(&zone->lru_lock); | |
bdc8cb98 | 4113 | zone_seqlock_init(zone); |
1da177e4 | 4114 | zone->zone_pgdat = pgdat; |
1da177e4 | 4115 | |
ed8ece2e | 4116 | zone_pcp_init(zone); |
b69408e8 CL |
4117 | for_each_lru(l) { |
4118 | INIT_LIST_HEAD(&zone->lru[l].list); | |
f8629631 | 4119 | zone->reclaim_stat.nr_saved_scan[l] = 0; |
b69408e8 | 4120 | } |
6e901571 KM |
4121 | zone->reclaim_stat.recent_rotated[0] = 0; |
4122 | zone->reclaim_stat.recent_rotated[1] = 0; | |
4123 | zone->reclaim_stat.recent_scanned[0] = 0; | |
4124 | zone->reclaim_stat.recent_scanned[1] = 0; | |
2244b95a | 4125 | zap_zone_vm_stats(zone); |
e815af95 | 4126 | zone->flags = 0; |
1da177e4 LT |
4127 | if (!size) |
4128 | continue; | |
4129 | ||
ba72cb8c | 4130 | set_pageblock_order(pageblock_default_order()); |
835c134e | 4131 | setup_usemap(pgdat, zone, size); |
a2f3aa02 DH |
4132 | ret = init_currently_empty_zone(zone, zone_start_pfn, |
4133 | size, MEMMAP_EARLY); | |
718127cc | 4134 | BUG_ON(ret); |
76cdd58e | 4135 | memmap_init(size, nid, j, zone_start_pfn); |
1da177e4 | 4136 | zone_start_pfn += size; |
1da177e4 LT |
4137 | } |
4138 | } | |
4139 | ||
577a32f6 | 4140 | static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat) |
1da177e4 | 4141 | { |
1da177e4 LT |
4142 | /* Skip empty nodes */ |
4143 | if (!pgdat->node_spanned_pages) | |
4144 | return; | |
4145 | ||
d41dee36 | 4146 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
1da177e4 LT |
4147 | /* ia64 gets its own node_mem_map, before this, without bootmem */ |
4148 | if (!pgdat->node_mem_map) { | |
e984bb43 | 4149 | unsigned long size, start, end; |
d41dee36 AW |
4150 | struct page *map; |
4151 | ||
e984bb43 BP |
4152 | /* |
4153 | * The zone's endpoints aren't required to be MAX_ORDER | |
4154 | * aligned but the node_mem_map endpoints must be in order | |
4155 | * for the buddy allocator to function correctly. | |
4156 | */ | |
4157 | start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1); | |
4158 | end = pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
4159 | end = ALIGN(end, MAX_ORDER_NR_PAGES); | |
4160 | size = (end - start) * sizeof(struct page); | |
6f167ec7 DH |
4161 | map = alloc_remap(pgdat->node_id, size); |
4162 | if (!map) | |
4163 | map = alloc_bootmem_node(pgdat, size); | |
e984bb43 | 4164 | pgdat->node_mem_map = map + (pgdat->node_start_pfn - start); |
1da177e4 | 4165 | } |
12d810c1 | 4166 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
4167 | /* |
4168 | * With no DISCONTIG, the global mem_map is just set as node 0's | |
4169 | */ | |
c713216d | 4170 | if (pgdat == NODE_DATA(0)) { |
1da177e4 | 4171 | mem_map = NODE_DATA(0)->node_mem_map; |
c713216d MG |
4172 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
4173 | if (page_to_pfn(mem_map) != pgdat->node_start_pfn) | |
467bc461 | 4174 | mem_map -= (pgdat->node_start_pfn - ARCH_PFN_OFFSET); |
c713216d MG |
4175 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ |
4176 | } | |
1da177e4 | 4177 | #endif |
d41dee36 | 4178 | #endif /* CONFIG_FLAT_NODE_MEM_MAP */ |
1da177e4 LT |
4179 | } |
4180 | ||
9109fb7b JW |
4181 | void __paginginit free_area_init_node(int nid, unsigned long *zones_size, |
4182 | unsigned long node_start_pfn, unsigned long *zholes_size) | |
1da177e4 | 4183 | { |
9109fb7b JW |
4184 | pg_data_t *pgdat = NODE_DATA(nid); |
4185 | ||
1da177e4 LT |
4186 | pgdat->node_id = nid; |
4187 | pgdat->node_start_pfn = node_start_pfn; | |
c713216d | 4188 | calculate_node_totalpages(pgdat, zones_size, zholes_size); |
1da177e4 LT |
4189 | |
4190 | alloc_node_mem_map(pgdat); | |
e8c27ac9 YL |
4191 | #ifdef CONFIG_FLAT_NODE_MEM_MAP |
4192 | printk(KERN_DEBUG "free_area_init_node: node %d, pgdat %08lx, node_mem_map %08lx\n", | |
4193 | nid, (unsigned long)pgdat, | |
4194 | (unsigned long)pgdat->node_mem_map); | |
4195 | #endif | |
1da177e4 LT |
4196 | |
4197 | free_area_init_core(pgdat, zones_size, zholes_size); | |
4198 | } | |
4199 | ||
c713216d | 4200 | #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
418508c1 MS |
4201 | |
4202 | #if MAX_NUMNODES > 1 | |
4203 | /* | |
4204 | * Figure out the number of possible node ids. | |
4205 | */ | |
4206 | static void __init setup_nr_node_ids(void) | |
4207 | { | |
4208 | unsigned int node; | |
4209 | unsigned int highest = 0; | |
4210 | ||
4211 | for_each_node_mask(node, node_possible_map) | |
4212 | highest = node; | |
4213 | nr_node_ids = highest + 1; | |
4214 | } | |
4215 | #else | |
4216 | static inline void setup_nr_node_ids(void) | |
4217 | { | |
4218 | } | |
4219 | #endif | |
4220 | ||
c713216d MG |
4221 | /** |
4222 | * add_active_range - Register a range of PFNs backed by physical memory | |
4223 | * @nid: The node ID the range resides on | |
4224 | * @start_pfn: The start PFN of the available physical memory | |
4225 | * @end_pfn: The end PFN of the available physical memory | |
4226 | * | |
4227 | * These ranges are stored in an early_node_map[] and later used by | |
4228 | * free_area_init_nodes() to calculate zone sizes and holes. If the | |
4229 | * range spans a memory hole, it is up to the architecture to ensure | |
4230 | * the memory is not freed by the bootmem allocator. If possible | |
4231 | * the range being registered will be merged with existing ranges. | |
4232 | */ | |
4233 | void __init add_active_range(unsigned int nid, unsigned long start_pfn, | |
4234 | unsigned long end_pfn) | |
4235 | { | |
4236 | int i; | |
4237 | ||
6b74ab97 MG |
4238 | mminit_dprintk(MMINIT_TRACE, "memory_register", |
4239 | "Entering add_active_range(%d, %#lx, %#lx) " | |
4240 | "%d entries of %d used\n", | |
4241 | nid, start_pfn, end_pfn, | |
4242 | nr_nodemap_entries, MAX_ACTIVE_REGIONS); | |
c713216d | 4243 | |
2dbb51c4 MG |
4244 | mminit_validate_memmodel_limits(&start_pfn, &end_pfn); |
4245 | ||
c713216d MG |
4246 | /* Merge with existing active regions if possible */ |
4247 | for (i = 0; i < nr_nodemap_entries; i++) { | |
4248 | if (early_node_map[i].nid != nid) | |
4249 | continue; | |
4250 | ||
4251 | /* Skip if an existing region covers this new one */ | |
4252 | if (start_pfn >= early_node_map[i].start_pfn && | |
4253 | end_pfn <= early_node_map[i].end_pfn) | |
4254 | return; | |
4255 | ||
4256 | /* Merge forward if suitable */ | |
4257 | if (start_pfn <= early_node_map[i].end_pfn && | |
4258 | end_pfn > early_node_map[i].end_pfn) { | |
4259 | early_node_map[i].end_pfn = end_pfn; | |
4260 | return; | |
4261 | } | |
4262 | ||
4263 | /* Merge backward if suitable */ | |
d2dbe08d | 4264 | if (start_pfn < early_node_map[i].start_pfn && |
c713216d MG |
4265 | end_pfn >= early_node_map[i].start_pfn) { |
4266 | early_node_map[i].start_pfn = start_pfn; | |
4267 | return; | |
4268 | } | |
4269 | } | |
4270 | ||
4271 | /* Check that early_node_map is large enough */ | |
4272 | if (i >= MAX_ACTIVE_REGIONS) { | |
4273 | printk(KERN_CRIT "More than %d memory regions, truncating\n", | |
4274 | MAX_ACTIVE_REGIONS); | |
4275 | return; | |
4276 | } | |
4277 | ||
4278 | early_node_map[i].nid = nid; | |
4279 | early_node_map[i].start_pfn = start_pfn; | |
4280 | early_node_map[i].end_pfn = end_pfn; | |
4281 | nr_nodemap_entries = i + 1; | |
4282 | } | |
4283 | ||
4284 | /** | |
cc1050ba | 4285 | * remove_active_range - Shrink an existing registered range of PFNs |
c713216d | 4286 | * @nid: The node id the range is on that should be shrunk |
cc1050ba YL |
4287 | * @start_pfn: The new PFN of the range |
4288 | * @end_pfn: The new PFN of the range | |
c713216d MG |
4289 | * |
4290 | * i386 with NUMA use alloc_remap() to store a node_mem_map on a local node. | |
cc1a9d86 YL |
4291 | * The map is kept near the end physical page range that has already been |
4292 | * registered. This function allows an arch to shrink an existing registered | |
4293 | * range. | |
c713216d | 4294 | */ |
cc1050ba YL |
4295 | void __init remove_active_range(unsigned int nid, unsigned long start_pfn, |
4296 | unsigned long end_pfn) | |
c713216d | 4297 | { |
cc1a9d86 YL |
4298 | int i, j; |
4299 | int removed = 0; | |
c713216d | 4300 | |
cc1050ba YL |
4301 | printk(KERN_DEBUG "remove_active_range (%d, %lu, %lu)\n", |
4302 | nid, start_pfn, end_pfn); | |
4303 | ||
c713216d | 4304 | /* Find the old active region end and shrink */ |
cc1a9d86 | 4305 | for_each_active_range_index_in_nid(i, nid) { |
cc1050ba YL |
4306 | if (early_node_map[i].start_pfn >= start_pfn && |
4307 | early_node_map[i].end_pfn <= end_pfn) { | |
cc1a9d86 | 4308 | /* clear it */ |
cc1050ba | 4309 | early_node_map[i].start_pfn = 0; |
cc1a9d86 YL |
4310 | early_node_map[i].end_pfn = 0; |
4311 | removed = 1; | |
4312 | continue; | |
4313 | } | |
cc1050ba YL |
4314 | if (early_node_map[i].start_pfn < start_pfn && |
4315 | early_node_map[i].end_pfn > start_pfn) { | |
4316 | unsigned long temp_end_pfn = early_node_map[i].end_pfn; | |
4317 | early_node_map[i].end_pfn = start_pfn; | |
4318 | if (temp_end_pfn > end_pfn) | |
4319 | add_active_range(nid, end_pfn, temp_end_pfn); | |
4320 | continue; | |
4321 | } | |
4322 | if (early_node_map[i].start_pfn >= start_pfn && | |
4323 | early_node_map[i].end_pfn > end_pfn && | |
4324 | early_node_map[i].start_pfn < end_pfn) { | |
4325 | early_node_map[i].start_pfn = end_pfn; | |
cc1a9d86 | 4326 | continue; |
c713216d | 4327 | } |
cc1a9d86 YL |
4328 | } |
4329 | ||
4330 | if (!removed) | |
4331 | return; | |
4332 | ||
4333 | /* remove the blank ones */ | |
4334 | for (i = nr_nodemap_entries - 1; i > 0; i--) { | |
4335 | if (early_node_map[i].nid != nid) | |
4336 | continue; | |
4337 | if (early_node_map[i].end_pfn) | |
4338 | continue; | |
4339 | /* we found it, get rid of it */ | |
4340 | for (j = i; j < nr_nodemap_entries - 1; j++) | |
4341 | memcpy(&early_node_map[j], &early_node_map[j+1], | |
4342 | sizeof(early_node_map[j])); | |
4343 | j = nr_nodemap_entries - 1; | |
4344 | memset(&early_node_map[j], 0, sizeof(early_node_map[j])); | |
4345 | nr_nodemap_entries--; | |
4346 | } | |
c713216d MG |
4347 | } |
4348 | ||
4349 | /** | |
4350 | * remove_all_active_ranges - Remove all currently registered regions | |
88ca3b94 | 4351 | * |
c713216d MG |
4352 | * During discovery, it may be found that a table like SRAT is invalid |
4353 | * and an alternative discovery method must be used. This function removes | |
4354 | * all currently registered regions. | |
4355 | */ | |
88ca3b94 | 4356 | void __init remove_all_active_ranges(void) |
c713216d MG |
4357 | { |
4358 | memset(early_node_map, 0, sizeof(early_node_map)); | |
4359 | nr_nodemap_entries = 0; | |
4360 | } | |
4361 | ||
4362 | /* Compare two active node_active_regions */ | |
4363 | static int __init cmp_node_active_region(const void *a, const void *b) | |
4364 | { | |
4365 | struct node_active_region *arange = (struct node_active_region *)a; | |
4366 | struct node_active_region *brange = (struct node_active_region *)b; | |
4367 | ||
4368 | /* Done this way to avoid overflows */ | |
4369 | if (arange->start_pfn > brange->start_pfn) | |
4370 | return 1; | |
4371 | if (arange->start_pfn < brange->start_pfn) | |
4372 | return -1; | |
4373 | ||
4374 | return 0; | |
4375 | } | |
4376 | ||
4377 | /* sort the node_map by start_pfn */ | |
32996250 | 4378 | void __init sort_node_map(void) |
c713216d MG |
4379 | { |
4380 | sort(early_node_map, (size_t)nr_nodemap_entries, | |
4381 | sizeof(struct node_active_region), | |
4382 | cmp_node_active_region, NULL); | |
4383 | } | |
4384 | ||
a6af2bc3 | 4385 | /* Find the lowest pfn for a node */ |
b69a7288 | 4386 | static unsigned long __init find_min_pfn_for_node(int nid) |
c713216d MG |
4387 | { |
4388 | int i; | |
a6af2bc3 | 4389 | unsigned long min_pfn = ULONG_MAX; |
1abbfb41 | 4390 | |
c713216d MG |
4391 | /* Assuming a sorted map, the first range found has the starting pfn */ |
4392 | for_each_active_range_index_in_nid(i, nid) | |
a6af2bc3 | 4393 | min_pfn = min(min_pfn, early_node_map[i].start_pfn); |
c713216d | 4394 | |
a6af2bc3 MG |
4395 | if (min_pfn == ULONG_MAX) { |
4396 | printk(KERN_WARNING | |
2bc0d261 | 4397 | "Could not find start_pfn for node %d\n", nid); |
a6af2bc3 MG |
4398 | return 0; |
4399 | } | |
4400 | ||
4401 | return min_pfn; | |
c713216d MG |
4402 | } |
4403 | ||
4404 | /** | |
4405 | * find_min_pfn_with_active_regions - Find the minimum PFN registered | |
4406 | * | |
4407 | * It returns the minimum PFN based on information provided via | |
88ca3b94 | 4408 | * add_active_range(). |
c713216d MG |
4409 | */ |
4410 | unsigned long __init find_min_pfn_with_active_regions(void) | |
4411 | { | |
4412 | return find_min_pfn_for_node(MAX_NUMNODES); | |
4413 | } | |
4414 | ||
37b07e41 LS |
4415 | /* |
4416 | * early_calculate_totalpages() | |
4417 | * Sum pages in active regions for movable zone. | |
4418 | * Populate N_HIGH_MEMORY for calculating usable_nodes. | |
4419 | */ | |
484f51f8 | 4420 | static unsigned long __init early_calculate_totalpages(void) |
7e63efef MG |
4421 | { |
4422 | int i; | |
4423 | unsigned long totalpages = 0; | |
4424 | ||
37b07e41 LS |
4425 | for (i = 0; i < nr_nodemap_entries; i++) { |
4426 | unsigned long pages = early_node_map[i].end_pfn - | |
7e63efef | 4427 | early_node_map[i].start_pfn; |
37b07e41 LS |
4428 | totalpages += pages; |
4429 | if (pages) | |
4430 | node_set_state(early_node_map[i].nid, N_HIGH_MEMORY); | |
4431 | } | |
4432 | return totalpages; | |
7e63efef MG |
4433 | } |
4434 | ||
2a1e274a MG |
4435 | /* |
4436 | * Find the PFN the Movable zone begins in each node. Kernel memory | |
4437 | * is spread evenly between nodes as long as the nodes have enough | |
4438 | * memory. When they don't, some nodes will have more kernelcore than | |
4439 | * others | |
4440 | */ | |
b69a7288 | 4441 | static void __init find_zone_movable_pfns_for_nodes(unsigned long *movable_pfn) |
2a1e274a MG |
4442 | { |
4443 | int i, nid; | |
4444 | unsigned long usable_startpfn; | |
4445 | unsigned long kernelcore_node, kernelcore_remaining; | |
66918dcd YL |
4446 | /* save the state before borrow the nodemask */ |
4447 | nodemask_t saved_node_state = node_states[N_HIGH_MEMORY]; | |
37b07e41 LS |
4448 | unsigned long totalpages = early_calculate_totalpages(); |
4449 | int usable_nodes = nodes_weight(node_states[N_HIGH_MEMORY]); | |
2a1e274a | 4450 | |
7e63efef MG |
4451 | /* |
4452 | * If movablecore was specified, calculate what size of | |
4453 | * kernelcore that corresponds so that memory usable for | |
4454 | * any allocation type is evenly spread. If both kernelcore | |
4455 | * and movablecore are specified, then the value of kernelcore | |
4456 | * will be used for required_kernelcore if it's greater than | |
4457 | * what movablecore would have allowed. | |
4458 | */ | |
4459 | if (required_movablecore) { | |
7e63efef MG |
4460 | unsigned long corepages; |
4461 | ||
4462 | /* | |
4463 | * Round-up so that ZONE_MOVABLE is at least as large as what | |
4464 | * was requested by the user | |
4465 | */ | |
4466 | required_movablecore = | |
4467 | roundup(required_movablecore, MAX_ORDER_NR_PAGES); | |
4468 | corepages = totalpages - required_movablecore; | |
4469 | ||
4470 | required_kernelcore = max(required_kernelcore, corepages); | |
4471 | } | |
4472 | ||
2a1e274a MG |
4473 | /* If kernelcore was not specified, there is no ZONE_MOVABLE */ |
4474 | if (!required_kernelcore) | |
66918dcd | 4475 | goto out; |
2a1e274a MG |
4476 | |
4477 | /* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */ | |
4478 | find_usable_zone_for_movable(); | |
4479 | usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone]; | |
4480 | ||
4481 | restart: | |
4482 | /* Spread kernelcore memory as evenly as possible throughout nodes */ | |
4483 | kernelcore_node = required_kernelcore / usable_nodes; | |
37b07e41 | 4484 | for_each_node_state(nid, N_HIGH_MEMORY) { |
2a1e274a MG |
4485 | /* |
4486 | * Recalculate kernelcore_node if the division per node | |
4487 | * now exceeds what is necessary to satisfy the requested | |
4488 | * amount of memory for the kernel | |
4489 | */ | |
4490 | if (required_kernelcore < kernelcore_node) | |
4491 | kernelcore_node = required_kernelcore / usable_nodes; | |
4492 | ||
4493 | /* | |
4494 | * As the map is walked, we track how much memory is usable | |
4495 | * by the kernel using kernelcore_remaining. When it is | |
4496 | * 0, the rest of the node is usable by ZONE_MOVABLE | |
4497 | */ | |
4498 | kernelcore_remaining = kernelcore_node; | |
4499 | ||
4500 | /* Go through each range of PFNs within this node */ | |
4501 | for_each_active_range_index_in_nid(i, nid) { | |
4502 | unsigned long start_pfn, end_pfn; | |
4503 | unsigned long size_pages; | |
4504 | ||
4505 | start_pfn = max(early_node_map[i].start_pfn, | |
4506 | zone_movable_pfn[nid]); | |
4507 | end_pfn = early_node_map[i].end_pfn; | |
4508 | if (start_pfn >= end_pfn) | |
4509 | continue; | |
4510 | ||
4511 | /* Account for what is only usable for kernelcore */ | |
4512 | if (start_pfn < usable_startpfn) { | |
4513 | unsigned long kernel_pages; | |
4514 | kernel_pages = min(end_pfn, usable_startpfn) | |
4515 | - start_pfn; | |
4516 | ||
4517 | kernelcore_remaining -= min(kernel_pages, | |
4518 | kernelcore_remaining); | |
4519 | required_kernelcore -= min(kernel_pages, | |
4520 | required_kernelcore); | |
4521 | ||
4522 | /* Continue if range is now fully accounted */ | |
4523 | if (end_pfn <= usable_startpfn) { | |
4524 | ||
4525 | /* | |
4526 | * Push zone_movable_pfn to the end so | |
4527 | * that if we have to rebalance | |
4528 | * kernelcore across nodes, we will | |
4529 | * not double account here | |
4530 | */ | |
4531 | zone_movable_pfn[nid] = end_pfn; | |
4532 | continue; | |
4533 | } | |
4534 | start_pfn = usable_startpfn; | |
4535 | } | |
4536 | ||
4537 | /* | |
4538 | * The usable PFN range for ZONE_MOVABLE is from | |
4539 | * start_pfn->end_pfn. Calculate size_pages as the | |
4540 | * number of pages used as kernelcore | |
4541 | */ | |
4542 | size_pages = end_pfn - start_pfn; | |
4543 | if (size_pages > kernelcore_remaining) | |
4544 | size_pages = kernelcore_remaining; | |
4545 | zone_movable_pfn[nid] = start_pfn + size_pages; | |
4546 | ||
4547 | /* | |
4548 | * Some kernelcore has been met, update counts and | |
4549 | * break if the kernelcore for this node has been | |
4550 | * satisified | |
4551 | */ | |
4552 | required_kernelcore -= min(required_kernelcore, | |
4553 | size_pages); | |
4554 | kernelcore_remaining -= size_pages; | |
4555 | if (!kernelcore_remaining) | |
4556 | break; | |
4557 | } | |
4558 | } | |
4559 | ||
4560 | /* | |
4561 | * If there is still required_kernelcore, we do another pass with one | |
4562 | * less node in the count. This will push zone_movable_pfn[nid] further | |
4563 | * along on the nodes that still have memory until kernelcore is | |
4564 | * satisified | |
4565 | */ | |
4566 | usable_nodes--; | |
4567 | if (usable_nodes && required_kernelcore > usable_nodes) | |
4568 | goto restart; | |
4569 | ||
4570 | /* Align start of ZONE_MOVABLE on all nids to MAX_ORDER_NR_PAGES */ | |
4571 | for (nid = 0; nid < MAX_NUMNODES; nid++) | |
4572 | zone_movable_pfn[nid] = | |
4573 | roundup(zone_movable_pfn[nid], MAX_ORDER_NR_PAGES); | |
66918dcd YL |
4574 | |
4575 | out: | |
4576 | /* restore the node_state */ | |
4577 | node_states[N_HIGH_MEMORY] = saved_node_state; | |
2a1e274a MG |
4578 | } |
4579 | ||
37b07e41 LS |
4580 | /* Any regular memory on that node ? */ |
4581 | static void check_for_regular_memory(pg_data_t *pgdat) | |
4582 | { | |
4583 | #ifdef CONFIG_HIGHMEM | |
4584 | enum zone_type zone_type; | |
4585 | ||
4586 | for (zone_type = 0; zone_type <= ZONE_NORMAL; zone_type++) { | |
4587 | struct zone *zone = &pgdat->node_zones[zone_type]; | |
4588 | if (zone->present_pages) | |
4589 | node_set_state(zone_to_nid(zone), N_NORMAL_MEMORY); | |
4590 | } | |
4591 | #endif | |
4592 | } | |
4593 | ||
c713216d MG |
4594 | /** |
4595 | * free_area_init_nodes - Initialise all pg_data_t and zone data | |
88ca3b94 | 4596 | * @max_zone_pfn: an array of max PFNs for each zone |
c713216d MG |
4597 | * |
4598 | * This will call free_area_init_node() for each active node in the system. | |
4599 | * Using the page ranges provided by add_active_range(), the size of each | |
4600 | * zone in each node and their holes is calculated. If the maximum PFN | |
4601 | * between two adjacent zones match, it is assumed that the zone is empty. | |
4602 | * For example, if arch_max_dma_pfn == arch_max_dma32_pfn, it is assumed | |
4603 | * that arch_max_dma32_pfn has no pages. It is also assumed that a zone | |
4604 | * starts where the previous one ended. For example, ZONE_DMA32 starts | |
4605 | * at arch_max_dma_pfn. | |
4606 | */ | |
4607 | void __init free_area_init_nodes(unsigned long *max_zone_pfn) | |
4608 | { | |
4609 | unsigned long nid; | |
db99100d | 4610 | int i; |
c713216d | 4611 | |
a6af2bc3 MG |
4612 | /* Sort early_node_map as initialisation assumes it is sorted */ |
4613 | sort_node_map(); | |
4614 | ||
c713216d MG |
4615 | /* Record where the zone boundaries are */ |
4616 | memset(arch_zone_lowest_possible_pfn, 0, | |
4617 | sizeof(arch_zone_lowest_possible_pfn)); | |
4618 | memset(arch_zone_highest_possible_pfn, 0, | |
4619 | sizeof(arch_zone_highest_possible_pfn)); | |
4620 | arch_zone_lowest_possible_pfn[0] = find_min_pfn_with_active_regions(); | |
4621 | arch_zone_highest_possible_pfn[0] = max_zone_pfn[0]; | |
4622 | for (i = 1; i < MAX_NR_ZONES; i++) { | |
2a1e274a MG |
4623 | if (i == ZONE_MOVABLE) |
4624 | continue; | |
c713216d MG |
4625 | arch_zone_lowest_possible_pfn[i] = |
4626 | arch_zone_highest_possible_pfn[i-1]; | |
4627 | arch_zone_highest_possible_pfn[i] = | |
4628 | max(max_zone_pfn[i], arch_zone_lowest_possible_pfn[i]); | |
4629 | } | |
2a1e274a MG |
4630 | arch_zone_lowest_possible_pfn[ZONE_MOVABLE] = 0; |
4631 | arch_zone_highest_possible_pfn[ZONE_MOVABLE] = 0; | |
4632 | ||
4633 | /* Find the PFNs that ZONE_MOVABLE begins at in each node */ | |
4634 | memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn)); | |
4635 | find_zone_movable_pfns_for_nodes(zone_movable_pfn); | |
c713216d | 4636 | |
c713216d MG |
4637 | /* Print out the zone ranges */ |
4638 | printk("Zone PFN ranges:\n"); | |
2a1e274a MG |
4639 | for (i = 0; i < MAX_NR_ZONES; i++) { |
4640 | if (i == ZONE_MOVABLE) | |
4641 | continue; | |
72f0ba02 DR |
4642 | printk(" %-8s ", zone_names[i]); |
4643 | if (arch_zone_lowest_possible_pfn[i] == | |
4644 | arch_zone_highest_possible_pfn[i]) | |
4645 | printk("empty\n"); | |
4646 | else | |
4647 | printk("%0#10lx -> %0#10lx\n", | |
c713216d MG |
4648 | arch_zone_lowest_possible_pfn[i], |
4649 | arch_zone_highest_possible_pfn[i]); | |
2a1e274a MG |
4650 | } |
4651 | ||
4652 | /* Print out the PFNs ZONE_MOVABLE begins at in each node */ | |
4653 | printk("Movable zone start PFN for each node\n"); | |
4654 | for (i = 0; i < MAX_NUMNODES; i++) { | |
4655 | if (zone_movable_pfn[i]) | |
4656 | printk(" Node %d: %lu\n", i, zone_movable_pfn[i]); | |
4657 | } | |
c713216d MG |
4658 | |
4659 | /* Print out the early_node_map[] */ | |
4660 | printk("early_node_map[%d] active PFN ranges\n", nr_nodemap_entries); | |
4661 | for (i = 0; i < nr_nodemap_entries; i++) | |
5dab8ec1 | 4662 | printk(" %3d: %0#10lx -> %0#10lx\n", early_node_map[i].nid, |
c713216d MG |
4663 | early_node_map[i].start_pfn, |
4664 | early_node_map[i].end_pfn); | |
4665 | ||
4666 | /* Initialise every node */ | |
708614e6 | 4667 | mminit_verify_pageflags_layout(); |
8ef82866 | 4668 | setup_nr_node_ids(); |
c713216d MG |
4669 | for_each_online_node(nid) { |
4670 | pg_data_t *pgdat = NODE_DATA(nid); | |
9109fb7b | 4671 | free_area_init_node(nid, NULL, |
c713216d | 4672 | find_min_pfn_for_node(nid), NULL); |
37b07e41 LS |
4673 | |
4674 | /* Any memory on that node */ | |
4675 | if (pgdat->node_present_pages) | |
4676 | node_set_state(nid, N_HIGH_MEMORY); | |
4677 | check_for_regular_memory(pgdat); | |
c713216d MG |
4678 | } |
4679 | } | |
2a1e274a | 4680 | |
7e63efef | 4681 | static int __init cmdline_parse_core(char *p, unsigned long *core) |
2a1e274a MG |
4682 | { |
4683 | unsigned long long coremem; | |
4684 | if (!p) | |
4685 | return -EINVAL; | |
4686 | ||
4687 | coremem = memparse(p, &p); | |
7e63efef | 4688 | *core = coremem >> PAGE_SHIFT; |
2a1e274a | 4689 | |
7e63efef | 4690 | /* Paranoid check that UL is enough for the coremem value */ |
2a1e274a MG |
4691 | WARN_ON((coremem >> PAGE_SHIFT) > ULONG_MAX); |
4692 | ||
4693 | return 0; | |
4694 | } | |
ed7ed365 | 4695 | |
7e63efef MG |
4696 | /* |
4697 | * kernelcore=size sets the amount of memory for use for allocations that | |
4698 | * cannot be reclaimed or migrated. | |
4699 | */ | |
4700 | static int __init cmdline_parse_kernelcore(char *p) | |
4701 | { | |
4702 | return cmdline_parse_core(p, &required_kernelcore); | |
4703 | } | |
4704 | ||
4705 | /* | |
4706 | * movablecore=size sets the amount of memory for use for allocations that | |
4707 | * can be reclaimed or migrated. | |
4708 | */ | |
4709 | static int __init cmdline_parse_movablecore(char *p) | |
4710 | { | |
4711 | return cmdline_parse_core(p, &required_movablecore); | |
4712 | } | |
4713 | ||
ed7ed365 | 4714 | early_param("kernelcore", cmdline_parse_kernelcore); |
7e63efef | 4715 | early_param("movablecore", cmdline_parse_movablecore); |
ed7ed365 | 4716 | |
c713216d MG |
4717 | #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ |
4718 | ||
0e0b864e | 4719 | /** |
88ca3b94 RD |
4720 | * set_dma_reserve - set the specified number of pages reserved in the first zone |
4721 | * @new_dma_reserve: The number of pages to mark reserved | |
0e0b864e MG |
4722 | * |
4723 | * The per-cpu batchsize and zone watermarks are determined by present_pages. | |
4724 | * In the DMA zone, a significant percentage may be consumed by kernel image | |
4725 | * and other unfreeable allocations which can skew the watermarks badly. This | |
88ca3b94 RD |
4726 | * function may optionally be used to account for unfreeable pages in the |
4727 | * first zone (e.g., ZONE_DMA). The effect will be lower watermarks and | |
4728 | * smaller per-cpu batchsize. | |
0e0b864e MG |
4729 | */ |
4730 | void __init set_dma_reserve(unsigned long new_dma_reserve) | |
4731 | { | |
4732 | dma_reserve = new_dma_reserve; | |
4733 | } | |
4734 | ||
93b7504e | 4735 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
08677214 YL |
4736 | struct pglist_data __refdata contig_page_data = { |
4737 | #ifndef CONFIG_NO_BOOTMEM | |
4738 | .bdata = &bootmem_node_data[0] | |
4739 | #endif | |
4740 | }; | |
1da177e4 | 4741 | EXPORT_SYMBOL(contig_page_data); |
93b7504e | 4742 | #endif |
1da177e4 LT |
4743 | |
4744 | void __init free_area_init(unsigned long *zones_size) | |
4745 | { | |
9109fb7b | 4746 | free_area_init_node(0, zones_size, |
1da177e4 LT |
4747 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, NULL); |
4748 | } | |
1da177e4 | 4749 | |
1da177e4 LT |
4750 | static int page_alloc_cpu_notify(struct notifier_block *self, |
4751 | unsigned long action, void *hcpu) | |
4752 | { | |
4753 | int cpu = (unsigned long)hcpu; | |
1da177e4 | 4754 | |
8bb78442 | 4755 | if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) { |
9f8f2172 CL |
4756 | drain_pages(cpu); |
4757 | ||
4758 | /* | |
4759 | * Spill the event counters of the dead processor | |
4760 | * into the current processors event counters. | |
4761 | * This artificially elevates the count of the current | |
4762 | * processor. | |
4763 | */ | |
f8891e5e | 4764 | vm_events_fold_cpu(cpu); |
9f8f2172 CL |
4765 | |
4766 | /* | |
4767 | * Zero the differential counters of the dead processor | |
4768 | * so that the vm statistics are consistent. | |
4769 | * | |
4770 | * This is only okay since the processor is dead and cannot | |
4771 | * race with what we are doing. | |
4772 | */ | |
2244b95a | 4773 | refresh_cpu_vm_stats(cpu); |
1da177e4 LT |
4774 | } |
4775 | return NOTIFY_OK; | |
4776 | } | |
1da177e4 LT |
4777 | |
4778 | void __init page_alloc_init(void) | |
4779 | { | |
4780 | hotcpu_notifier(page_alloc_cpu_notify, 0); | |
4781 | } | |
4782 | ||
cb45b0e9 HA |
4783 | /* |
4784 | * calculate_totalreserve_pages - called when sysctl_lower_zone_reserve_ratio | |
4785 | * or min_free_kbytes changes. | |
4786 | */ | |
4787 | static void calculate_totalreserve_pages(void) | |
4788 | { | |
4789 | struct pglist_data *pgdat; | |
4790 | unsigned long reserve_pages = 0; | |
2f6726e5 | 4791 | enum zone_type i, j; |
cb45b0e9 HA |
4792 | |
4793 | for_each_online_pgdat(pgdat) { | |
4794 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
4795 | struct zone *zone = pgdat->node_zones + i; | |
4796 | unsigned long max = 0; | |
4797 | ||
4798 | /* Find valid and maximum lowmem_reserve in the zone */ | |
4799 | for (j = i; j < MAX_NR_ZONES; j++) { | |
4800 | if (zone->lowmem_reserve[j] > max) | |
4801 | max = zone->lowmem_reserve[j]; | |
4802 | } | |
4803 | ||
41858966 MG |
4804 | /* we treat the high watermark as reserved pages. */ |
4805 | max += high_wmark_pages(zone); | |
cb45b0e9 HA |
4806 | |
4807 | if (max > zone->present_pages) | |
4808 | max = zone->present_pages; | |
4809 | reserve_pages += max; | |
4810 | } | |
4811 | } | |
4812 | totalreserve_pages = reserve_pages; | |
4813 | } | |
4814 | ||
1da177e4 LT |
4815 | /* |
4816 | * setup_per_zone_lowmem_reserve - called whenever | |
4817 | * sysctl_lower_zone_reserve_ratio changes. Ensures that each zone | |
4818 | * has a correct pages reserved value, so an adequate number of | |
4819 | * pages are left in the zone after a successful __alloc_pages(). | |
4820 | */ | |
4821 | static void setup_per_zone_lowmem_reserve(void) | |
4822 | { | |
4823 | struct pglist_data *pgdat; | |
2f6726e5 | 4824 | enum zone_type j, idx; |
1da177e4 | 4825 | |
ec936fc5 | 4826 | for_each_online_pgdat(pgdat) { |
1da177e4 LT |
4827 | for (j = 0; j < MAX_NR_ZONES; j++) { |
4828 | struct zone *zone = pgdat->node_zones + j; | |
4829 | unsigned long present_pages = zone->present_pages; | |
4830 | ||
4831 | zone->lowmem_reserve[j] = 0; | |
4832 | ||
2f6726e5 CL |
4833 | idx = j; |
4834 | while (idx) { | |
1da177e4 LT |
4835 | struct zone *lower_zone; |
4836 | ||
2f6726e5 CL |
4837 | idx--; |
4838 | ||
1da177e4 LT |
4839 | if (sysctl_lowmem_reserve_ratio[idx] < 1) |
4840 | sysctl_lowmem_reserve_ratio[idx] = 1; | |
4841 | ||
4842 | lower_zone = pgdat->node_zones + idx; | |
4843 | lower_zone->lowmem_reserve[j] = present_pages / | |
4844 | sysctl_lowmem_reserve_ratio[idx]; | |
4845 | present_pages += lower_zone->present_pages; | |
4846 | } | |
4847 | } | |
4848 | } | |
cb45b0e9 HA |
4849 | |
4850 | /* update totalreserve_pages */ | |
4851 | calculate_totalreserve_pages(); | |
1da177e4 LT |
4852 | } |
4853 | ||
88ca3b94 | 4854 | /** |
bc75d33f | 4855 | * setup_per_zone_wmarks - called when min_free_kbytes changes |
bce7394a | 4856 | * or when memory is hot-{added|removed} |
88ca3b94 | 4857 | * |
bc75d33f MK |
4858 | * Ensures that the watermark[min,low,high] values for each zone are set |
4859 | * correctly with respect to min_free_kbytes. | |
1da177e4 | 4860 | */ |
bc75d33f | 4861 | void setup_per_zone_wmarks(void) |
1da177e4 LT |
4862 | { |
4863 | unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10); | |
4864 | unsigned long lowmem_pages = 0; | |
4865 | struct zone *zone; | |
4866 | unsigned long flags; | |
4867 | ||
4868 | /* Calculate total number of !ZONE_HIGHMEM pages */ | |
4869 | for_each_zone(zone) { | |
4870 | if (!is_highmem(zone)) | |
4871 | lowmem_pages += zone->present_pages; | |
4872 | } | |
4873 | ||
4874 | for_each_zone(zone) { | |
ac924c60 AM |
4875 | u64 tmp; |
4876 | ||
1125b4e3 | 4877 | spin_lock_irqsave(&zone->lock, flags); |
ac924c60 AM |
4878 | tmp = (u64)pages_min * zone->present_pages; |
4879 | do_div(tmp, lowmem_pages); | |
1da177e4 LT |
4880 | if (is_highmem(zone)) { |
4881 | /* | |
669ed175 NP |
4882 | * __GFP_HIGH and PF_MEMALLOC allocations usually don't |
4883 | * need highmem pages, so cap pages_min to a small | |
4884 | * value here. | |
4885 | * | |
41858966 | 4886 | * The WMARK_HIGH-WMARK_LOW and (WMARK_LOW-WMARK_MIN) |
669ed175 NP |
4887 | * deltas controls asynch page reclaim, and so should |
4888 | * not be capped for highmem. | |
1da177e4 LT |
4889 | */ |
4890 | int min_pages; | |
4891 | ||
4892 | min_pages = zone->present_pages / 1024; | |
4893 | if (min_pages < SWAP_CLUSTER_MAX) | |
4894 | min_pages = SWAP_CLUSTER_MAX; | |
4895 | if (min_pages > 128) | |
4896 | min_pages = 128; | |
41858966 | 4897 | zone->watermark[WMARK_MIN] = min_pages; |
1da177e4 | 4898 | } else { |
669ed175 NP |
4899 | /* |
4900 | * If it's a lowmem zone, reserve a number of pages | |
1da177e4 LT |
4901 | * proportionate to the zone's size. |
4902 | */ | |
41858966 | 4903 | zone->watermark[WMARK_MIN] = tmp; |
1da177e4 LT |
4904 | } |
4905 | ||
41858966 MG |
4906 | zone->watermark[WMARK_LOW] = min_wmark_pages(zone) + (tmp >> 2); |
4907 | zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + (tmp >> 1); | |
56fd56b8 | 4908 | setup_zone_migrate_reserve(zone); |
1125b4e3 | 4909 | spin_unlock_irqrestore(&zone->lock, flags); |
1da177e4 | 4910 | } |
cb45b0e9 HA |
4911 | |
4912 | /* update totalreserve_pages */ | |
4913 | calculate_totalreserve_pages(); | |
1da177e4 LT |
4914 | } |
4915 | ||
55a4462a | 4916 | /* |
556adecb RR |
4917 | * The inactive anon list should be small enough that the VM never has to |
4918 | * do too much work, but large enough that each inactive page has a chance | |
4919 | * to be referenced again before it is swapped out. | |
4920 | * | |
4921 | * The inactive_anon ratio is the target ratio of ACTIVE_ANON to | |
4922 | * INACTIVE_ANON pages on this zone's LRU, maintained by the | |
4923 | * pageout code. A zone->inactive_ratio of 3 means 3:1 or 25% of | |
4924 | * the anonymous pages are kept on the inactive list. | |
4925 | * | |
4926 | * total target max | |
4927 | * memory ratio inactive anon | |
4928 | * ------------------------------------- | |
4929 | * 10MB 1 5MB | |
4930 | * 100MB 1 50MB | |
4931 | * 1GB 3 250MB | |
4932 | * 10GB 10 0.9GB | |
4933 | * 100GB 31 3GB | |
4934 | * 1TB 101 10GB | |
4935 | * 10TB 320 32GB | |
4936 | */ | |
96cb4df5 | 4937 | void calculate_zone_inactive_ratio(struct zone *zone) |
556adecb | 4938 | { |
96cb4df5 | 4939 | unsigned int gb, ratio; |
556adecb | 4940 | |
96cb4df5 MK |
4941 | /* Zone size in gigabytes */ |
4942 | gb = zone->present_pages >> (30 - PAGE_SHIFT); | |
4943 | if (gb) | |
556adecb | 4944 | ratio = int_sqrt(10 * gb); |
96cb4df5 MK |
4945 | else |
4946 | ratio = 1; | |
556adecb | 4947 | |
96cb4df5 MK |
4948 | zone->inactive_ratio = ratio; |
4949 | } | |
556adecb | 4950 | |
96cb4df5 MK |
4951 | static void __init setup_per_zone_inactive_ratio(void) |
4952 | { | |
4953 | struct zone *zone; | |
4954 | ||
4955 | for_each_zone(zone) | |
4956 | calculate_zone_inactive_ratio(zone); | |
556adecb RR |
4957 | } |
4958 | ||
1da177e4 LT |
4959 | /* |
4960 | * Initialise min_free_kbytes. | |
4961 | * | |
4962 | * For small machines we want it small (128k min). For large machines | |
4963 | * we want it large (64MB max). But it is not linear, because network | |
4964 | * bandwidth does not increase linearly with machine size. We use | |
4965 | * | |
4966 | * min_free_kbytes = 4 * sqrt(lowmem_kbytes), for better accuracy: | |
4967 | * min_free_kbytes = sqrt(lowmem_kbytes * 16) | |
4968 | * | |
4969 | * which yields | |
4970 | * | |
4971 | * 16MB: 512k | |
4972 | * 32MB: 724k | |
4973 | * 64MB: 1024k | |
4974 | * 128MB: 1448k | |
4975 | * 256MB: 2048k | |
4976 | * 512MB: 2896k | |
4977 | * 1024MB: 4096k | |
4978 | * 2048MB: 5792k | |
4979 | * 4096MB: 8192k | |
4980 | * 8192MB: 11584k | |
4981 | * 16384MB: 16384k | |
4982 | */ | |
bc75d33f | 4983 | static int __init init_per_zone_wmark_min(void) |
1da177e4 LT |
4984 | { |
4985 | unsigned long lowmem_kbytes; | |
4986 | ||
4987 | lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10); | |
4988 | ||
4989 | min_free_kbytes = int_sqrt(lowmem_kbytes * 16); | |
4990 | if (min_free_kbytes < 128) | |
4991 | min_free_kbytes = 128; | |
4992 | if (min_free_kbytes > 65536) | |
4993 | min_free_kbytes = 65536; | |
bc75d33f | 4994 | setup_per_zone_wmarks(); |
1da177e4 | 4995 | setup_per_zone_lowmem_reserve(); |
556adecb | 4996 | setup_per_zone_inactive_ratio(); |
1da177e4 LT |
4997 | return 0; |
4998 | } | |
bc75d33f | 4999 | module_init(init_per_zone_wmark_min) |
1da177e4 LT |
5000 | |
5001 | /* | |
5002 | * min_free_kbytes_sysctl_handler - just a wrapper around proc_dointvec() so | |
5003 | * that we can call two helper functions whenever min_free_kbytes | |
5004 | * changes. | |
5005 | */ | |
5006 | int min_free_kbytes_sysctl_handler(ctl_table *table, int write, | |
8d65af78 | 5007 | void __user *buffer, size_t *length, loff_t *ppos) |
1da177e4 | 5008 | { |
8d65af78 | 5009 | proc_dointvec(table, write, buffer, length, ppos); |
3b1d92c5 | 5010 | if (write) |
bc75d33f | 5011 | setup_per_zone_wmarks(); |
1da177e4 LT |
5012 | return 0; |
5013 | } | |
5014 | ||
9614634f CL |
5015 | #ifdef CONFIG_NUMA |
5016 | int sysctl_min_unmapped_ratio_sysctl_handler(ctl_table *table, int write, | |
8d65af78 | 5017 | void __user *buffer, size_t *length, loff_t *ppos) |
9614634f CL |
5018 | { |
5019 | struct zone *zone; | |
5020 | int rc; | |
5021 | ||
8d65af78 | 5022 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); |
9614634f CL |
5023 | if (rc) |
5024 | return rc; | |
5025 | ||
5026 | for_each_zone(zone) | |
8417bba4 | 5027 | zone->min_unmapped_pages = (zone->present_pages * |
9614634f CL |
5028 | sysctl_min_unmapped_ratio) / 100; |
5029 | return 0; | |
5030 | } | |
0ff38490 CL |
5031 | |
5032 | int sysctl_min_slab_ratio_sysctl_handler(ctl_table *table, int write, | |
8d65af78 | 5033 | void __user *buffer, size_t *length, loff_t *ppos) |
0ff38490 CL |
5034 | { |
5035 | struct zone *zone; | |
5036 | int rc; | |
5037 | ||
8d65af78 | 5038 | rc = proc_dointvec_minmax(table, write, buffer, length, ppos); |
0ff38490 CL |
5039 | if (rc) |
5040 | return rc; | |
5041 | ||
5042 | for_each_zone(zone) | |
5043 | zone->min_slab_pages = (zone->present_pages * | |
5044 | sysctl_min_slab_ratio) / 100; | |
5045 | return 0; | |
5046 | } | |
9614634f CL |
5047 | #endif |
5048 | ||
1da177e4 LT |
5049 | /* |
5050 | * lowmem_reserve_ratio_sysctl_handler - just a wrapper around | |
5051 | * proc_dointvec() so that we can call setup_per_zone_lowmem_reserve() | |
5052 | * whenever sysctl_lowmem_reserve_ratio changes. | |
5053 | * | |
5054 | * The reserve ratio obviously has absolutely no relation with the | |
41858966 | 5055 | * minimum watermarks. The lowmem reserve ratio can only make sense |
1da177e4 LT |
5056 | * if in function of the boot time zone sizes. |
5057 | */ | |
5058 | int lowmem_reserve_ratio_sysctl_handler(ctl_table *table, int write, | |
8d65af78 | 5059 | void __user *buffer, size_t *length, loff_t *ppos) |
1da177e4 | 5060 | { |
8d65af78 | 5061 | proc_dointvec_minmax(table, write, buffer, length, ppos); |
1da177e4 LT |
5062 | setup_per_zone_lowmem_reserve(); |
5063 | return 0; | |
5064 | } | |
5065 | ||
8ad4b1fb RS |
5066 | /* |
5067 | * percpu_pagelist_fraction - changes the pcp->high for each zone on each | |
5068 | * cpu. It is the fraction of total pages in each zone that a hot per cpu pagelist | |
5069 | * can have before it gets flushed back to buddy allocator. | |
5070 | */ | |
5071 | ||
5072 | int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write, | |
8d65af78 | 5073 | void __user *buffer, size_t *length, loff_t *ppos) |
8ad4b1fb RS |
5074 | { |
5075 | struct zone *zone; | |
5076 | unsigned int cpu; | |
5077 | int ret; | |
5078 | ||
8d65af78 | 5079 | ret = proc_dointvec_minmax(table, write, buffer, length, ppos); |
8ad4b1fb RS |
5080 | if (!write || (ret == -EINVAL)) |
5081 | return ret; | |
364df0eb | 5082 | for_each_populated_zone(zone) { |
99dcc3e5 | 5083 | for_each_possible_cpu(cpu) { |
8ad4b1fb RS |
5084 | unsigned long high; |
5085 | high = zone->present_pages / percpu_pagelist_fraction; | |
99dcc3e5 CL |
5086 | setup_pagelist_highmark( |
5087 | per_cpu_ptr(zone->pageset, cpu), high); | |
8ad4b1fb RS |
5088 | } |
5089 | } | |
5090 | return 0; | |
5091 | } | |
5092 | ||
f034b5d4 | 5093 | int hashdist = HASHDIST_DEFAULT; |
1da177e4 LT |
5094 | |
5095 | #ifdef CONFIG_NUMA | |
5096 | static int __init set_hashdist(char *str) | |
5097 | { | |
5098 | if (!str) | |
5099 | return 0; | |
5100 | hashdist = simple_strtoul(str, &str, 0); | |
5101 | return 1; | |
5102 | } | |
5103 | __setup("hashdist=", set_hashdist); | |
5104 | #endif | |
5105 | ||
5106 | /* | |
5107 | * allocate a large system hash table from bootmem | |
5108 | * - it is assumed that the hash table must contain an exact power-of-2 | |
5109 | * quantity of entries | |
5110 | * - limit is the number of hash buckets, not the total allocation size | |
5111 | */ | |
5112 | void *__init alloc_large_system_hash(const char *tablename, | |
5113 | unsigned long bucketsize, | |
5114 | unsigned long numentries, | |
5115 | int scale, | |
5116 | int flags, | |
5117 | unsigned int *_hash_shift, | |
5118 | unsigned int *_hash_mask, | |
5119 | unsigned long limit) | |
5120 | { | |
5121 | unsigned long long max = limit; | |
5122 | unsigned long log2qty, size; | |
5123 | void *table = NULL; | |
5124 | ||
5125 | /* allow the kernel cmdline to have a say */ | |
5126 | if (!numentries) { | |
5127 | /* round applicable memory size up to nearest megabyte */ | |
04903664 | 5128 | numentries = nr_kernel_pages; |
1da177e4 LT |
5129 | numentries += (1UL << (20 - PAGE_SHIFT)) - 1; |
5130 | numentries >>= 20 - PAGE_SHIFT; | |
5131 | numentries <<= 20 - PAGE_SHIFT; | |
5132 | ||
5133 | /* limit to 1 bucket per 2^scale bytes of low memory */ | |
5134 | if (scale > PAGE_SHIFT) | |
5135 | numentries >>= (scale - PAGE_SHIFT); | |
5136 | else | |
5137 | numentries <<= (PAGE_SHIFT - scale); | |
9ab37b8f PM |
5138 | |
5139 | /* Make sure we've got at least a 0-order allocation.. */ | |
2c85f51d JB |
5140 | if (unlikely(flags & HASH_SMALL)) { |
5141 | /* Makes no sense without HASH_EARLY */ | |
5142 | WARN_ON(!(flags & HASH_EARLY)); | |
5143 | if (!(numentries >> *_hash_shift)) { | |
5144 | numentries = 1UL << *_hash_shift; | |
5145 | BUG_ON(!numentries); | |
5146 | } | |
5147 | } else if (unlikely((numentries * bucketsize) < PAGE_SIZE)) | |
9ab37b8f | 5148 | numentries = PAGE_SIZE / bucketsize; |
1da177e4 | 5149 | } |
6e692ed3 | 5150 | numentries = roundup_pow_of_two(numentries); |
1da177e4 LT |
5151 | |
5152 | /* limit allocation size to 1/16 total memory by default */ | |
5153 | if (max == 0) { | |
5154 | max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4; | |
5155 | do_div(max, bucketsize); | |
5156 | } | |
5157 | ||
5158 | if (numentries > max) | |
5159 | numentries = max; | |
5160 | ||
f0d1b0b3 | 5161 | log2qty = ilog2(numentries); |
1da177e4 LT |
5162 | |
5163 | do { | |
5164 | size = bucketsize << log2qty; | |
5165 | if (flags & HASH_EARLY) | |
74768ed8 | 5166 | table = alloc_bootmem_nopanic(size); |
1da177e4 LT |
5167 | else if (hashdist) |
5168 | table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL); | |
5169 | else { | |
1037b83b ED |
5170 | /* |
5171 | * If bucketsize is not a power-of-two, we may free | |
a1dd268c MG |
5172 | * some pages at the end of hash table which |
5173 | * alloc_pages_exact() automatically does | |
1037b83b | 5174 | */ |
264ef8a9 | 5175 | if (get_order(size) < MAX_ORDER) { |
a1dd268c | 5176 | table = alloc_pages_exact(size, GFP_ATOMIC); |
264ef8a9 CM |
5177 | kmemleak_alloc(table, size, 1, GFP_ATOMIC); |
5178 | } | |
1da177e4 LT |
5179 | } |
5180 | } while (!table && size > PAGE_SIZE && --log2qty); | |
5181 | ||
5182 | if (!table) | |
5183 | panic("Failed to allocate %s hash table\n", tablename); | |
5184 | ||
f241e660 | 5185 | printk(KERN_INFO "%s hash table entries: %ld (order: %d, %lu bytes)\n", |
1da177e4 | 5186 | tablename, |
f241e660 | 5187 | (1UL << log2qty), |
f0d1b0b3 | 5188 | ilog2(size) - PAGE_SHIFT, |
1da177e4 LT |
5189 | size); |
5190 | ||
5191 | if (_hash_shift) | |
5192 | *_hash_shift = log2qty; | |
5193 | if (_hash_mask) | |
5194 | *_hash_mask = (1 << log2qty) - 1; | |
5195 | ||
5196 | return table; | |
5197 | } | |
a117e66e | 5198 | |
835c134e MG |
5199 | /* Return a pointer to the bitmap storing bits affecting a block of pages */ |
5200 | static inline unsigned long *get_pageblock_bitmap(struct zone *zone, | |
5201 | unsigned long pfn) | |
5202 | { | |
5203 | #ifdef CONFIG_SPARSEMEM | |
5204 | return __pfn_to_section(pfn)->pageblock_flags; | |
5205 | #else | |
5206 | return zone->pageblock_flags; | |
5207 | #endif /* CONFIG_SPARSEMEM */ | |
5208 | } | |
5209 | ||
5210 | static inline int pfn_to_bitidx(struct zone *zone, unsigned long pfn) | |
5211 | { | |
5212 | #ifdef CONFIG_SPARSEMEM | |
5213 | pfn &= (PAGES_PER_SECTION-1); | |
d9c23400 | 5214 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; |
835c134e MG |
5215 | #else |
5216 | pfn = pfn - zone->zone_start_pfn; | |
d9c23400 | 5217 | return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; |
835c134e MG |
5218 | #endif /* CONFIG_SPARSEMEM */ |
5219 | } | |
5220 | ||
5221 | /** | |
d9c23400 | 5222 | * get_pageblock_flags_group - Return the requested group of flags for the pageblock_nr_pages block of pages |
835c134e MG |
5223 | * @page: The page within the block of interest |
5224 | * @start_bitidx: The first bit of interest to retrieve | |
5225 | * @end_bitidx: The last bit of interest | |
5226 | * returns pageblock_bits flags | |
5227 | */ | |
5228 | unsigned long get_pageblock_flags_group(struct page *page, | |
5229 | int start_bitidx, int end_bitidx) | |
5230 | { | |
5231 | struct zone *zone; | |
5232 | unsigned long *bitmap; | |
5233 | unsigned long pfn, bitidx; | |
5234 | unsigned long flags = 0; | |
5235 | unsigned long value = 1; | |
5236 | ||
5237 | zone = page_zone(page); | |
5238 | pfn = page_to_pfn(page); | |
5239 | bitmap = get_pageblock_bitmap(zone, pfn); | |
5240 | bitidx = pfn_to_bitidx(zone, pfn); | |
5241 | ||
5242 | for (; start_bitidx <= end_bitidx; start_bitidx++, value <<= 1) | |
5243 | if (test_bit(bitidx + start_bitidx, bitmap)) | |
5244 | flags |= value; | |
6220ec78 | 5245 | |
835c134e MG |
5246 | return flags; |
5247 | } | |
5248 | ||
5249 | /** | |
d9c23400 | 5250 | * set_pageblock_flags_group - Set the requested group of flags for a pageblock_nr_pages block of pages |
835c134e MG |
5251 | * @page: The page within the block of interest |
5252 | * @start_bitidx: The first bit of interest | |
5253 | * @end_bitidx: The last bit of interest | |
5254 | * @flags: The flags to set | |
5255 | */ | |
5256 | void set_pageblock_flags_group(struct page *page, unsigned long flags, | |
5257 | int start_bitidx, int end_bitidx) | |
5258 | { | |
5259 | struct zone *zone; | |
5260 | unsigned long *bitmap; | |
5261 | unsigned long pfn, bitidx; | |
5262 | unsigned long value = 1; | |
5263 | ||
5264 | zone = page_zone(page); | |
5265 | pfn = page_to_pfn(page); | |
5266 | bitmap = get_pageblock_bitmap(zone, pfn); | |
5267 | bitidx = pfn_to_bitidx(zone, pfn); | |
86051ca5 KH |
5268 | VM_BUG_ON(pfn < zone->zone_start_pfn); |
5269 | VM_BUG_ON(pfn >= zone->zone_start_pfn + zone->spanned_pages); | |
835c134e MG |
5270 | |
5271 | for (; start_bitidx <= end_bitidx; start_bitidx++, value <<= 1) | |
5272 | if (flags & value) | |
5273 | __set_bit(bitidx + start_bitidx, bitmap); | |
5274 | else | |
5275 | __clear_bit(bitidx + start_bitidx, bitmap); | |
5276 | } | |
a5d76b54 KH |
5277 | |
5278 | /* | |
5279 | * This is designed as sub function...plz see page_isolation.c also. | |
5280 | * set/clear page block's type to be ISOLATE. | |
5281 | * page allocater never alloc memory from ISOLATE block. | |
5282 | */ | |
5283 | ||
5284 | int set_migratetype_isolate(struct page *page) | |
5285 | { | |
5286 | struct zone *zone; | |
925cc71e RJ |
5287 | struct page *curr_page; |
5288 | unsigned long flags, pfn, iter; | |
5289 | unsigned long immobile = 0; | |
5290 | struct memory_isolate_notify arg; | |
5291 | int notifier_ret; | |
a5d76b54 | 5292 | int ret = -EBUSY; |
8e7e40d9 | 5293 | int zone_idx; |
a5d76b54 KH |
5294 | |
5295 | zone = page_zone(page); | |
8e7e40d9 | 5296 | zone_idx = zone_idx(zone); |
925cc71e | 5297 | |
a5d76b54 | 5298 | spin_lock_irqsave(&zone->lock, flags); |
925cc71e RJ |
5299 | if (get_pageblock_migratetype(page) == MIGRATE_MOVABLE || |
5300 | zone_idx == ZONE_MOVABLE) { | |
5301 | ret = 0; | |
5302 | goto out; | |
5303 | } | |
5304 | ||
5305 | pfn = page_to_pfn(page); | |
5306 | arg.start_pfn = pfn; | |
5307 | arg.nr_pages = pageblock_nr_pages; | |
5308 | arg.pages_found = 0; | |
5309 | ||
a5d76b54 | 5310 | /* |
925cc71e RJ |
5311 | * It may be possible to isolate a pageblock even if the |
5312 | * migratetype is not MIGRATE_MOVABLE. The memory isolation | |
5313 | * notifier chain is used by balloon drivers to return the | |
5314 | * number of pages in a range that are held by the balloon | |
5315 | * driver to shrink memory. If all the pages are accounted for | |
5316 | * by balloons, are free, or on the LRU, isolation can continue. | |
5317 | * Later, for example, when memory hotplug notifier runs, these | |
5318 | * pages reported as "can be isolated" should be isolated(freed) | |
5319 | * by the balloon driver through the memory notifier chain. | |
a5d76b54 | 5320 | */ |
925cc71e RJ |
5321 | notifier_ret = memory_isolate_notify(MEM_ISOLATE_COUNT, &arg); |
5322 | notifier_ret = notifier_to_errno(notifier_ret); | |
5323 | if (notifier_ret || !arg.pages_found) | |
a5d76b54 | 5324 | goto out; |
925cc71e RJ |
5325 | |
5326 | for (iter = pfn; iter < (pfn + pageblock_nr_pages); iter++) { | |
5327 | if (!pfn_valid_within(pfn)) | |
5328 | continue; | |
5329 | ||
5330 | curr_page = pfn_to_page(iter); | |
5331 | if (!page_count(curr_page) || PageLRU(curr_page)) | |
5332 | continue; | |
5333 | ||
5334 | immobile++; | |
5335 | } | |
5336 | ||
5337 | if (arg.pages_found == immobile) | |
5338 | ret = 0; | |
5339 | ||
a5d76b54 | 5340 | out: |
925cc71e RJ |
5341 | if (!ret) { |
5342 | set_pageblock_migratetype(page, MIGRATE_ISOLATE); | |
5343 | move_freepages_block(zone, page, MIGRATE_ISOLATE); | |
5344 | } | |
5345 | ||
a5d76b54 KH |
5346 | spin_unlock_irqrestore(&zone->lock, flags); |
5347 | if (!ret) | |
9f8f2172 | 5348 | drain_all_pages(); |
a5d76b54 KH |
5349 | return ret; |
5350 | } | |
5351 | ||
5352 | void unset_migratetype_isolate(struct page *page) | |
5353 | { | |
5354 | struct zone *zone; | |
5355 | unsigned long flags; | |
5356 | zone = page_zone(page); | |
5357 | spin_lock_irqsave(&zone->lock, flags); | |
5358 | if (get_pageblock_migratetype(page) != MIGRATE_ISOLATE) | |
5359 | goto out; | |
5360 | set_pageblock_migratetype(page, MIGRATE_MOVABLE); | |
5361 | move_freepages_block(zone, page, MIGRATE_MOVABLE); | |
5362 | out: | |
5363 | spin_unlock_irqrestore(&zone->lock, flags); | |
5364 | } | |
0c0e6195 KH |
5365 | |
5366 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5367 | /* | |
5368 | * All pages in the range must be isolated before calling this. | |
5369 | */ | |
5370 | void | |
5371 | __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
5372 | { | |
5373 | struct page *page; | |
5374 | struct zone *zone; | |
5375 | int order, i; | |
5376 | unsigned long pfn; | |
5377 | unsigned long flags; | |
5378 | /* find the first valid pfn */ | |
5379 | for (pfn = start_pfn; pfn < end_pfn; pfn++) | |
5380 | if (pfn_valid(pfn)) | |
5381 | break; | |
5382 | if (pfn == end_pfn) | |
5383 | return; | |
5384 | zone = page_zone(pfn_to_page(pfn)); | |
5385 | spin_lock_irqsave(&zone->lock, flags); | |
5386 | pfn = start_pfn; | |
5387 | while (pfn < end_pfn) { | |
5388 | if (!pfn_valid(pfn)) { | |
5389 | pfn++; | |
5390 | continue; | |
5391 | } | |
5392 | page = pfn_to_page(pfn); | |
5393 | BUG_ON(page_count(page)); | |
5394 | BUG_ON(!PageBuddy(page)); | |
5395 | order = page_order(page); | |
5396 | #ifdef CONFIG_DEBUG_VM | |
5397 | printk(KERN_INFO "remove from free list %lx %d %lx\n", | |
5398 | pfn, 1 << order, end_pfn); | |
5399 | #endif | |
5400 | list_del(&page->lru); | |
5401 | rmv_page_order(page); | |
5402 | zone->free_area[order].nr_free--; | |
5403 | __mod_zone_page_state(zone, NR_FREE_PAGES, | |
5404 | - (1UL << order)); | |
5405 | for (i = 0; i < (1 << order); i++) | |
5406 | SetPageReserved((page+i)); | |
5407 | pfn += (1 << order); | |
5408 | } | |
5409 | spin_unlock_irqrestore(&zone->lock, flags); | |
5410 | } | |
5411 | #endif | |
8d22ba1b WF |
5412 | |
5413 | #ifdef CONFIG_MEMORY_FAILURE | |
5414 | bool is_free_buddy_page(struct page *page) | |
5415 | { | |
5416 | struct zone *zone = page_zone(page); | |
5417 | unsigned long pfn = page_to_pfn(page); | |
5418 | unsigned long flags; | |
5419 | int order; | |
5420 | ||
5421 | spin_lock_irqsave(&zone->lock, flags); | |
5422 | for (order = 0; order < MAX_ORDER; order++) { | |
5423 | struct page *page_head = page - (pfn & ((1 << order) - 1)); | |
5424 | ||
5425 | if (PageBuddy(page_head) && page_order(page_head) >= order) | |
5426 | break; | |
5427 | } | |
5428 | spin_unlock_irqrestore(&zone->lock, flags); | |
5429 | ||
5430 | return order < MAX_ORDER; | |
5431 | } | |
5432 | #endif | |
718a3821 WF |
5433 | |
5434 | static struct trace_print_flags pageflag_names[] = { | |
5435 | {1UL << PG_locked, "locked" }, | |
5436 | {1UL << PG_error, "error" }, | |
5437 | {1UL << PG_referenced, "referenced" }, | |
5438 | {1UL << PG_uptodate, "uptodate" }, | |
5439 | {1UL << PG_dirty, "dirty" }, | |
5440 | {1UL << PG_lru, "lru" }, | |
5441 | {1UL << PG_active, "active" }, | |
5442 | {1UL << PG_slab, "slab" }, | |
5443 | {1UL << PG_owner_priv_1, "owner_priv_1" }, | |
5444 | {1UL << PG_arch_1, "arch_1" }, | |
5445 | {1UL << PG_reserved, "reserved" }, | |
5446 | {1UL << PG_private, "private" }, | |
5447 | {1UL << PG_private_2, "private_2" }, | |
5448 | {1UL << PG_writeback, "writeback" }, | |
5449 | #ifdef CONFIG_PAGEFLAGS_EXTENDED | |
5450 | {1UL << PG_head, "head" }, | |
5451 | {1UL << PG_tail, "tail" }, | |
5452 | #else | |
5453 | {1UL << PG_compound, "compound" }, | |
5454 | #endif | |
5455 | {1UL << PG_swapcache, "swapcache" }, | |
5456 | {1UL << PG_mappedtodisk, "mappedtodisk" }, | |
5457 | {1UL << PG_reclaim, "reclaim" }, | |
5458 | {1UL << PG_buddy, "buddy" }, | |
5459 | {1UL << PG_swapbacked, "swapbacked" }, | |
5460 | {1UL << PG_unevictable, "unevictable" }, | |
5461 | #ifdef CONFIG_MMU | |
5462 | {1UL << PG_mlocked, "mlocked" }, | |
5463 | #endif | |
5464 | #ifdef CONFIG_ARCH_USES_PG_UNCACHED | |
5465 | {1UL << PG_uncached, "uncached" }, | |
5466 | #endif | |
5467 | #ifdef CONFIG_MEMORY_FAILURE | |
5468 | {1UL << PG_hwpoison, "hwpoison" }, | |
5469 | #endif | |
5470 | {-1UL, NULL }, | |
5471 | }; | |
5472 | ||
5473 | static void dump_page_flags(unsigned long flags) | |
5474 | { | |
5475 | const char *delim = ""; | |
5476 | unsigned long mask; | |
5477 | int i; | |
5478 | ||
5479 | printk(KERN_ALERT "page flags: %#lx(", flags); | |
5480 | ||
5481 | /* remove zone id */ | |
5482 | flags &= (1UL << NR_PAGEFLAGS) - 1; | |
5483 | ||
5484 | for (i = 0; pageflag_names[i].name && flags; i++) { | |
5485 | ||
5486 | mask = pageflag_names[i].mask; | |
5487 | if ((flags & mask) != mask) | |
5488 | continue; | |
5489 | ||
5490 | flags &= ~mask; | |
5491 | printk("%s%s", delim, pageflag_names[i].name); | |
5492 | delim = "|"; | |
5493 | } | |
5494 | ||
5495 | /* check for left over flags */ | |
5496 | if (flags) | |
5497 | printk("%s%#lx", delim, flags); | |
5498 | ||
5499 | printk(")\n"); | |
5500 | } | |
5501 | ||
5502 | void dump_page(struct page *page) | |
5503 | { | |
5504 | printk(KERN_ALERT | |
5505 | "page:%p count:%d mapcount:%d mapping:%p index:%#lx\n", | |
5506 | page, page_count(page), page_mapcount(page), | |
5507 | page->mapping, page->index); | |
5508 | dump_page_flags(page->flags); | |
5509 | } |