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f6ac2354 CL |
1 | /* |
2 | * linux/mm/vmstat.c | |
3 | * | |
4 | * Manages VM statistics | |
5 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
2244b95a CL |
6 | * |
7 | * zoned VM statistics | |
8 | * Copyright (C) 2006 Silicon Graphics, Inc., | |
9 | * Christoph Lameter <christoph@lameter.com> | |
f6ac2354 CL |
10 | */ |
11 | ||
f6ac2354 | 12 | #include <linux/mm.h> |
4e950f6f | 13 | #include <linux/err.h> |
2244b95a | 14 | #include <linux/module.h> |
df9ecaba | 15 | #include <linux/cpu.h> |
e8edc6e0 | 16 | #include <linux/sched.h> |
f6ac2354 | 17 | |
f8891e5e CL |
18 | #ifdef CONFIG_VM_EVENT_COUNTERS |
19 | DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}}; | |
20 | EXPORT_PER_CPU_SYMBOL(vm_event_states); | |
21 | ||
22 | static void sum_vm_events(unsigned long *ret, cpumask_t *cpumask) | |
23 | { | |
24 | int cpu = 0; | |
25 | int i; | |
26 | ||
27 | memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long)); | |
28 | ||
29 | cpu = first_cpu(*cpumask); | |
30 | while (cpu < NR_CPUS) { | |
31 | struct vm_event_state *this = &per_cpu(vm_event_states, cpu); | |
32 | ||
33 | cpu = next_cpu(cpu, *cpumask); | |
34 | ||
35 | if (cpu < NR_CPUS) | |
36 | prefetch(&per_cpu(vm_event_states, cpu)); | |
37 | ||
38 | ||
39 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) | |
40 | ret[i] += this->event[i]; | |
41 | } | |
42 | } | |
43 | ||
44 | /* | |
45 | * Accumulate the vm event counters across all CPUs. | |
46 | * The result is unavoidably approximate - it can change | |
47 | * during and after execution of this function. | |
48 | */ | |
49 | void all_vm_events(unsigned long *ret) | |
50 | { | |
51 | sum_vm_events(ret, &cpu_online_map); | |
52 | } | |
32dd66fc | 53 | EXPORT_SYMBOL_GPL(all_vm_events); |
f8891e5e CL |
54 | |
55 | #ifdef CONFIG_HOTPLUG | |
56 | /* | |
57 | * Fold the foreign cpu events into our own. | |
58 | * | |
59 | * This is adding to the events on one processor | |
60 | * but keeps the global counts constant. | |
61 | */ | |
62 | void vm_events_fold_cpu(int cpu) | |
63 | { | |
64 | struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu); | |
65 | int i; | |
66 | ||
67 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) { | |
68 | count_vm_events(i, fold_state->event[i]); | |
69 | fold_state->event[i] = 0; | |
70 | } | |
71 | } | |
72 | #endif /* CONFIG_HOTPLUG */ | |
73 | ||
74 | #endif /* CONFIG_VM_EVENT_COUNTERS */ | |
75 | ||
2244b95a CL |
76 | /* |
77 | * Manage combined zone based / global counters | |
78 | * | |
79 | * vm_stat contains the global counters | |
80 | */ | |
81 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
82 | EXPORT_SYMBOL(vm_stat); | |
83 | ||
84 | #ifdef CONFIG_SMP | |
85 | ||
df9ecaba CL |
86 | static int calculate_threshold(struct zone *zone) |
87 | { | |
88 | int threshold; | |
89 | int mem; /* memory in 128 MB units */ | |
90 | ||
91 | /* | |
92 | * The threshold scales with the number of processors and the amount | |
93 | * of memory per zone. More memory means that we can defer updates for | |
94 | * longer, more processors could lead to more contention. | |
95 | * fls() is used to have a cheap way of logarithmic scaling. | |
96 | * | |
97 | * Some sample thresholds: | |
98 | * | |
99 | * Threshold Processors (fls) Zonesize fls(mem+1) | |
100 | * ------------------------------------------------------------------ | |
101 | * 8 1 1 0.9-1 GB 4 | |
102 | * 16 2 2 0.9-1 GB 4 | |
103 | * 20 2 2 1-2 GB 5 | |
104 | * 24 2 2 2-4 GB 6 | |
105 | * 28 2 2 4-8 GB 7 | |
106 | * 32 2 2 8-16 GB 8 | |
107 | * 4 2 2 <128M 1 | |
108 | * 30 4 3 2-4 GB 5 | |
109 | * 48 4 3 8-16 GB 8 | |
110 | * 32 8 4 1-2 GB 4 | |
111 | * 32 8 4 0.9-1GB 4 | |
112 | * 10 16 5 <128M 1 | |
113 | * 40 16 5 900M 4 | |
114 | * 70 64 7 2-4 GB 5 | |
115 | * 84 64 7 4-8 GB 6 | |
116 | * 108 512 9 4-8 GB 6 | |
117 | * 125 1024 10 8-16 GB 8 | |
118 | * 125 1024 10 16-32 GB 9 | |
119 | */ | |
120 | ||
121 | mem = zone->present_pages >> (27 - PAGE_SHIFT); | |
122 | ||
123 | threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem)); | |
124 | ||
125 | /* | |
126 | * Maximum threshold is 125 | |
127 | */ | |
128 | threshold = min(125, threshold); | |
129 | ||
130 | return threshold; | |
131 | } | |
2244b95a CL |
132 | |
133 | /* | |
df9ecaba | 134 | * Refresh the thresholds for each zone. |
2244b95a | 135 | */ |
df9ecaba | 136 | static void refresh_zone_stat_thresholds(void) |
2244b95a | 137 | { |
df9ecaba CL |
138 | struct zone *zone; |
139 | int cpu; | |
140 | int threshold; | |
141 | ||
142 | for_each_zone(zone) { | |
143 | ||
144 | if (!zone->present_pages) | |
145 | continue; | |
146 | ||
147 | threshold = calculate_threshold(zone); | |
148 | ||
149 | for_each_online_cpu(cpu) | |
150 | zone_pcp(zone, cpu)->stat_threshold = threshold; | |
151 | } | |
2244b95a CL |
152 | } |
153 | ||
154 | /* | |
155 | * For use when we know that interrupts are disabled. | |
156 | */ | |
157 | void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
158 | int delta) | |
159 | { | |
df9ecaba CL |
160 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
161 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
162 | long x; |
163 | ||
2244b95a CL |
164 | x = delta + *p; |
165 | ||
df9ecaba | 166 | if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) { |
2244b95a CL |
167 | zone_page_state_add(x, zone, item); |
168 | x = 0; | |
169 | } | |
2244b95a CL |
170 | *p = x; |
171 | } | |
172 | EXPORT_SYMBOL(__mod_zone_page_state); | |
173 | ||
174 | /* | |
175 | * For an unknown interrupt state | |
176 | */ | |
177 | void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
178 | int delta) | |
179 | { | |
180 | unsigned long flags; | |
181 | ||
182 | local_irq_save(flags); | |
183 | __mod_zone_page_state(zone, item, delta); | |
184 | local_irq_restore(flags); | |
185 | } | |
186 | EXPORT_SYMBOL(mod_zone_page_state); | |
187 | ||
188 | /* | |
189 | * Optimized increment and decrement functions. | |
190 | * | |
191 | * These are only for a single page and therefore can take a struct page * | |
192 | * argument instead of struct zone *. This allows the inclusion of the code | |
193 | * generated for page_zone(page) into the optimized functions. | |
194 | * | |
195 | * No overflow check is necessary and therefore the differential can be | |
196 | * incremented or decremented in place which may allow the compilers to | |
197 | * generate better code. | |
2244b95a CL |
198 | * The increment or decrement is known and therefore one boundary check can |
199 | * be omitted. | |
200 | * | |
df9ecaba CL |
201 | * NOTE: These functions are very performance sensitive. Change only |
202 | * with care. | |
203 | * | |
2244b95a CL |
204 | * Some processors have inc/dec instructions that are atomic vs an interrupt. |
205 | * However, the code must first determine the differential location in a zone | |
206 | * based on the processor number and then inc/dec the counter. There is no | |
207 | * guarantee without disabling preemption that the processor will not change | |
208 | * in between and therefore the atomicity vs. interrupt cannot be exploited | |
209 | * in a useful way here. | |
210 | */ | |
c8785385 | 211 | void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 212 | { |
df9ecaba CL |
213 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
214 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
215 | |
216 | (*p)++; | |
217 | ||
df9ecaba CL |
218 | if (unlikely(*p > pcp->stat_threshold)) { |
219 | int overstep = pcp->stat_threshold / 2; | |
220 | ||
221 | zone_page_state_add(*p + overstep, zone, item); | |
222 | *p = -overstep; | |
2244b95a CL |
223 | } |
224 | } | |
ca889e6c CL |
225 | |
226 | void __inc_zone_page_state(struct page *page, enum zone_stat_item item) | |
227 | { | |
228 | __inc_zone_state(page_zone(page), item); | |
229 | } | |
2244b95a CL |
230 | EXPORT_SYMBOL(__inc_zone_page_state); |
231 | ||
c8785385 | 232 | void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 233 | { |
df9ecaba CL |
234 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
235 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
236 | |
237 | (*p)--; | |
238 | ||
df9ecaba CL |
239 | if (unlikely(*p < - pcp->stat_threshold)) { |
240 | int overstep = pcp->stat_threshold / 2; | |
241 | ||
242 | zone_page_state_add(*p - overstep, zone, item); | |
243 | *p = overstep; | |
2244b95a CL |
244 | } |
245 | } | |
c8785385 CL |
246 | |
247 | void __dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
248 | { | |
249 | __dec_zone_state(page_zone(page), item); | |
250 | } | |
2244b95a CL |
251 | EXPORT_SYMBOL(__dec_zone_page_state); |
252 | ||
ca889e6c CL |
253 | void inc_zone_state(struct zone *zone, enum zone_stat_item item) |
254 | { | |
255 | unsigned long flags; | |
256 | ||
257 | local_irq_save(flags); | |
258 | __inc_zone_state(zone, item); | |
259 | local_irq_restore(flags); | |
260 | } | |
261 | ||
2244b95a CL |
262 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
263 | { | |
264 | unsigned long flags; | |
265 | struct zone *zone; | |
2244b95a CL |
266 | |
267 | zone = page_zone(page); | |
268 | local_irq_save(flags); | |
ca889e6c | 269 | __inc_zone_state(zone, item); |
2244b95a CL |
270 | local_irq_restore(flags); |
271 | } | |
272 | EXPORT_SYMBOL(inc_zone_page_state); | |
273 | ||
274 | void dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
275 | { | |
276 | unsigned long flags; | |
2244b95a | 277 | |
2244b95a | 278 | local_irq_save(flags); |
a302eb4e | 279 | __dec_zone_page_state(page, item); |
2244b95a CL |
280 | local_irq_restore(flags); |
281 | } | |
282 | EXPORT_SYMBOL(dec_zone_page_state); | |
283 | ||
284 | /* | |
285 | * Update the zone counters for one cpu. | |
4037d452 CL |
286 | * |
287 | * Note that refresh_cpu_vm_stats strives to only access | |
288 | * node local memory. The per cpu pagesets on remote zones are placed | |
289 | * in the memory local to the processor using that pageset. So the | |
290 | * loop over all zones will access a series of cachelines local to | |
291 | * the processor. | |
292 | * | |
293 | * The call to zone_page_state_add updates the cachelines with the | |
294 | * statistics in the remote zone struct as well as the global cachelines | |
295 | * with the global counters. These could cause remote node cache line | |
296 | * bouncing and will have to be only done when necessary. | |
2244b95a CL |
297 | */ |
298 | void refresh_cpu_vm_stats(int cpu) | |
299 | { | |
300 | struct zone *zone; | |
301 | int i; | |
302 | unsigned long flags; | |
303 | ||
304 | for_each_zone(zone) { | |
4037d452 | 305 | struct per_cpu_pageset *p; |
2244b95a | 306 | |
39bbcb8f CL |
307 | if (!populated_zone(zone)) |
308 | continue; | |
309 | ||
4037d452 | 310 | p = zone_pcp(zone, cpu); |
2244b95a CL |
311 | |
312 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
4037d452 | 313 | if (p->vm_stat_diff[i]) { |
2244b95a | 314 | local_irq_save(flags); |
4037d452 | 315 | zone_page_state_add(p->vm_stat_diff[i], |
2244b95a | 316 | zone, i); |
4037d452 CL |
317 | p->vm_stat_diff[i] = 0; |
318 | #ifdef CONFIG_NUMA | |
319 | /* 3 seconds idle till flush */ | |
320 | p->expire = 3; | |
321 | #endif | |
2244b95a CL |
322 | local_irq_restore(flags); |
323 | } | |
4037d452 CL |
324 | #ifdef CONFIG_NUMA |
325 | /* | |
326 | * Deal with draining the remote pageset of this | |
327 | * processor | |
328 | * | |
329 | * Check if there are pages remaining in this pageset | |
330 | * if not then there is nothing to expire. | |
331 | */ | |
332 | if (!p->expire || (!p->pcp[0].count && !p->pcp[1].count)) | |
333 | continue; | |
334 | ||
335 | /* | |
336 | * We never drain zones local to this processor. | |
337 | */ | |
338 | if (zone_to_nid(zone) == numa_node_id()) { | |
339 | p->expire = 0; | |
340 | continue; | |
341 | } | |
342 | ||
343 | p->expire--; | |
344 | if (p->expire) | |
345 | continue; | |
346 | ||
347 | if (p->pcp[0].count) | |
348 | drain_zone_pages(zone, p->pcp + 0); | |
349 | ||
350 | if (p->pcp[1].count) | |
351 | drain_zone_pages(zone, p->pcp + 1); | |
352 | #endif | |
2244b95a CL |
353 | } |
354 | } | |
355 | ||
356 | static void __refresh_cpu_vm_stats(void *dummy) | |
357 | { | |
358 | refresh_cpu_vm_stats(smp_processor_id()); | |
359 | } | |
360 | ||
361 | /* | |
362 | * Consolidate all counters. | |
363 | * | |
364 | * Note that the result is less inaccurate but still inaccurate | |
365 | * if concurrent processes are allowed to run. | |
366 | */ | |
367 | void refresh_vm_stats(void) | |
368 | { | |
369 | on_each_cpu(__refresh_cpu_vm_stats, NULL, 0, 1); | |
370 | } | |
371 | EXPORT_SYMBOL(refresh_vm_stats); | |
372 | ||
373 | #endif | |
374 | ||
ca889e6c CL |
375 | #ifdef CONFIG_NUMA |
376 | /* | |
377 | * zonelist = the list of zones passed to the allocator | |
378 | * z = the zone from which the allocation occurred. | |
379 | * | |
380 | * Must be called with interrupts disabled. | |
381 | */ | |
382 | void zone_statistics(struct zonelist *zonelist, struct zone *z) | |
383 | { | |
384 | if (z->zone_pgdat == zonelist->zones[0]->zone_pgdat) { | |
385 | __inc_zone_state(z, NUMA_HIT); | |
386 | } else { | |
387 | __inc_zone_state(z, NUMA_MISS); | |
388 | __inc_zone_state(zonelist->zones[0], NUMA_FOREIGN); | |
389 | } | |
5d292343 | 390 | if (z->node == numa_node_id()) |
ca889e6c CL |
391 | __inc_zone_state(z, NUMA_LOCAL); |
392 | else | |
393 | __inc_zone_state(z, NUMA_OTHER); | |
394 | } | |
395 | #endif | |
396 | ||
f6ac2354 CL |
397 | #ifdef CONFIG_PROC_FS |
398 | ||
399 | #include <linux/seq_file.h> | |
400 | ||
467c996c MG |
401 | static char * const migratetype_names[MIGRATE_TYPES] = { |
402 | "Unmovable", | |
403 | "Reclaimable", | |
404 | "Movable", | |
405 | "Reserve", | |
406 | }; | |
407 | ||
f6ac2354 CL |
408 | static void *frag_start(struct seq_file *m, loff_t *pos) |
409 | { | |
410 | pg_data_t *pgdat; | |
411 | loff_t node = *pos; | |
412 | for (pgdat = first_online_pgdat(); | |
413 | pgdat && node; | |
414 | pgdat = next_online_pgdat(pgdat)) | |
415 | --node; | |
416 | ||
417 | return pgdat; | |
418 | } | |
419 | ||
420 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) | |
421 | { | |
422 | pg_data_t *pgdat = (pg_data_t *)arg; | |
423 | ||
424 | (*pos)++; | |
425 | return next_online_pgdat(pgdat); | |
426 | } | |
427 | ||
428 | static void frag_stop(struct seq_file *m, void *arg) | |
429 | { | |
430 | } | |
431 | ||
467c996c MG |
432 | /* Walk all the zones in a node and print using a callback */ |
433 | static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat, | |
434 | void (*print)(struct seq_file *m, pg_data_t *, struct zone *)) | |
f6ac2354 | 435 | { |
f6ac2354 CL |
436 | struct zone *zone; |
437 | struct zone *node_zones = pgdat->node_zones; | |
438 | unsigned long flags; | |
f6ac2354 CL |
439 | |
440 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { | |
441 | if (!populated_zone(zone)) | |
442 | continue; | |
443 | ||
444 | spin_lock_irqsave(&zone->lock, flags); | |
467c996c | 445 | print(m, pgdat, zone); |
f6ac2354 | 446 | spin_unlock_irqrestore(&zone->lock, flags); |
467c996c MG |
447 | } |
448 | } | |
449 | ||
450 | static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, | |
451 | struct zone *zone) | |
452 | { | |
453 | int order; | |
454 | ||
455 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
456 | for (order = 0; order < MAX_ORDER; ++order) | |
457 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); | |
458 | seq_putc(m, '\n'); | |
459 | } | |
460 | ||
461 | /* | |
462 | * This walks the free areas for each zone. | |
463 | */ | |
464 | static int frag_show(struct seq_file *m, void *arg) | |
465 | { | |
466 | pg_data_t *pgdat = (pg_data_t *)arg; | |
467 | walk_zones_in_node(m, pgdat, frag_show_print); | |
468 | return 0; | |
469 | } | |
470 | ||
471 | static void pagetypeinfo_showfree_print(struct seq_file *m, | |
472 | pg_data_t *pgdat, struct zone *zone) | |
473 | { | |
474 | int order, mtype; | |
475 | ||
476 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) { | |
477 | seq_printf(m, "Node %4d, zone %8s, type %12s ", | |
478 | pgdat->node_id, | |
479 | zone->name, | |
480 | migratetype_names[mtype]); | |
481 | for (order = 0; order < MAX_ORDER; ++order) { | |
482 | unsigned long freecount = 0; | |
483 | struct free_area *area; | |
484 | struct list_head *curr; | |
485 | ||
486 | area = &(zone->free_area[order]); | |
487 | ||
488 | list_for_each(curr, &area->free_list[mtype]) | |
489 | freecount++; | |
490 | seq_printf(m, "%6lu ", freecount); | |
491 | } | |
f6ac2354 CL |
492 | seq_putc(m, '\n'); |
493 | } | |
467c996c MG |
494 | } |
495 | ||
496 | /* Print out the free pages at each order for each migatetype */ | |
497 | static int pagetypeinfo_showfree(struct seq_file *m, void *arg) | |
498 | { | |
499 | int order; | |
500 | pg_data_t *pgdat = (pg_data_t *)arg; | |
501 | ||
502 | /* Print header */ | |
503 | seq_printf(m, "%-43s ", "Free pages count per migrate type at order"); | |
504 | for (order = 0; order < MAX_ORDER; ++order) | |
505 | seq_printf(m, "%6d ", order); | |
506 | seq_putc(m, '\n'); | |
507 | ||
508 | walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print); | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | static void pagetypeinfo_showblockcount_print(struct seq_file *m, | |
514 | pg_data_t *pgdat, struct zone *zone) | |
515 | { | |
516 | int mtype; | |
517 | unsigned long pfn; | |
518 | unsigned long start_pfn = zone->zone_start_pfn; | |
519 | unsigned long end_pfn = start_pfn + zone->spanned_pages; | |
520 | unsigned long count[MIGRATE_TYPES] = { 0, }; | |
521 | ||
522 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { | |
523 | struct page *page; | |
524 | ||
525 | if (!pfn_valid(pfn)) | |
526 | continue; | |
527 | ||
528 | page = pfn_to_page(pfn); | |
529 | mtype = get_pageblock_migratetype(page); | |
530 | ||
531 | count[mtype]++; | |
532 | } | |
533 | ||
534 | /* Print counts */ | |
535 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
536 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) | |
537 | seq_printf(m, "%12lu ", count[mtype]); | |
538 | seq_putc(m, '\n'); | |
539 | } | |
540 | ||
541 | /* Print out the free pages at each order for each migratetype */ | |
542 | static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg) | |
543 | { | |
544 | int mtype; | |
545 | pg_data_t *pgdat = (pg_data_t *)arg; | |
546 | ||
547 | seq_printf(m, "\n%-23s", "Number of blocks type "); | |
548 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) | |
549 | seq_printf(m, "%12s ", migratetype_names[mtype]); | |
550 | seq_putc(m, '\n'); | |
551 | walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print); | |
552 | ||
553 | return 0; | |
554 | } | |
555 | ||
556 | /* | |
557 | * This prints out statistics in relation to grouping pages by mobility. | |
558 | * It is expensive to collect so do not constantly read the file. | |
559 | */ | |
560 | static int pagetypeinfo_show(struct seq_file *m, void *arg) | |
561 | { | |
562 | pg_data_t *pgdat = (pg_data_t *)arg; | |
563 | ||
564 | seq_printf(m, "Page block order: %d\n", pageblock_order); | |
565 | seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages); | |
566 | seq_putc(m, '\n'); | |
567 | pagetypeinfo_showfree(m, pgdat); | |
568 | pagetypeinfo_showblockcount(m, pgdat); | |
569 | ||
f6ac2354 CL |
570 | return 0; |
571 | } | |
572 | ||
15ad7cdc | 573 | const struct seq_operations fragmentation_op = { |
f6ac2354 CL |
574 | .start = frag_start, |
575 | .next = frag_next, | |
576 | .stop = frag_stop, | |
577 | .show = frag_show, | |
578 | }; | |
579 | ||
467c996c MG |
580 | const struct seq_operations pagetypeinfo_op = { |
581 | .start = frag_start, | |
582 | .next = frag_next, | |
583 | .stop = frag_stop, | |
584 | .show = pagetypeinfo_show, | |
585 | }; | |
586 | ||
4b51d669 CL |
587 | #ifdef CONFIG_ZONE_DMA |
588 | #define TEXT_FOR_DMA(xx) xx "_dma", | |
589 | #else | |
590 | #define TEXT_FOR_DMA(xx) | |
591 | #endif | |
592 | ||
27bf71c2 CL |
593 | #ifdef CONFIG_ZONE_DMA32 |
594 | #define TEXT_FOR_DMA32(xx) xx "_dma32", | |
595 | #else | |
596 | #define TEXT_FOR_DMA32(xx) | |
597 | #endif | |
598 | ||
599 | #ifdef CONFIG_HIGHMEM | |
600 | #define TEXT_FOR_HIGHMEM(xx) xx "_high", | |
601 | #else | |
602 | #define TEXT_FOR_HIGHMEM(xx) | |
603 | #endif | |
604 | ||
4b51d669 | 605 | #define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \ |
2a1e274a | 606 | TEXT_FOR_HIGHMEM(xx) xx "_movable", |
27bf71c2 | 607 | |
15ad7cdc | 608 | static const char * const vmstat_text[] = { |
2244b95a | 609 | /* Zoned VM counters */ |
d23ad423 | 610 | "nr_free_pages", |
c8785385 | 611 | "nr_inactive", |
23c1fb52 | 612 | "nr_active", |
f3dbd344 | 613 | "nr_anon_pages", |
65ba55f5 | 614 | "nr_mapped", |
347ce434 | 615 | "nr_file_pages", |
51ed4491 CL |
616 | "nr_dirty", |
617 | "nr_writeback", | |
972d1a7b CL |
618 | "nr_slab_reclaimable", |
619 | "nr_slab_unreclaimable", | |
df849a15 | 620 | "nr_page_table_pages", |
f6ac2354 | 621 | "nr_unstable", |
d2c5e30c | 622 | "nr_bounce", |
e129b5c2 | 623 | "nr_vmscan_write", |
f6ac2354 | 624 | |
ca889e6c CL |
625 | #ifdef CONFIG_NUMA |
626 | "numa_hit", | |
627 | "numa_miss", | |
628 | "numa_foreign", | |
629 | "numa_interleave", | |
630 | "numa_local", | |
631 | "numa_other", | |
632 | #endif | |
633 | ||
f8891e5e | 634 | #ifdef CONFIG_VM_EVENT_COUNTERS |
f6ac2354 CL |
635 | "pgpgin", |
636 | "pgpgout", | |
637 | "pswpin", | |
638 | "pswpout", | |
639 | ||
27bf71c2 | 640 | TEXTS_FOR_ZONES("pgalloc") |
f6ac2354 CL |
641 | |
642 | "pgfree", | |
643 | "pgactivate", | |
644 | "pgdeactivate", | |
645 | ||
646 | "pgfault", | |
647 | "pgmajfault", | |
648 | ||
27bf71c2 CL |
649 | TEXTS_FOR_ZONES("pgrefill") |
650 | TEXTS_FOR_ZONES("pgsteal") | |
651 | TEXTS_FOR_ZONES("pgscan_kswapd") | |
652 | TEXTS_FOR_ZONES("pgscan_direct") | |
f6ac2354 CL |
653 | |
654 | "pginodesteal", | |
655 | "slabs_scanned", | |
656 | "kswapd_steal", | |
657 | "kswapd_inodesteal", | |
658 | "pageoutrun", | |
659 | "allocstall", | |
660 | ||
661 | "pgrotated", | |
f8891e5e | 662 | #endif |
f6ac2354 CL |
663 | }; |
664 | ||
467c996c MG |
665 | static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, |
666 | struct zone *zone) | |
f6ac2354 | 667 | { |
467c996c MG |
668 | int i; |
669 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); | |
670 | seq_printf(m, | |
671 | "\n pages free %lu" | |
672 | "\n min %lu" | |
673 | "\n low %lu" | |
674 | "\n high %lu" | |
675 | "\n scanned %lu (a: %lu i: %lu)" | |
676 | "\n spanned %lu" | |
677 | "\n present %lu", | |
678 | zone_page_state(zone, NR_FREE_PAGES), | |
679 | zone->pages_min, | |
680 | zone->pages_low, | |
681 | zone->pages_high, | |
682 | zone->pages_scanned, | |
683 | zone->nr_scan_active, zone->nr_scan_inactive, | |
684 | zone->spanned_pages, | |
685 | zone->present_pages); | |
686 | ||
687 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
688 | seq_printf(m, "\n %-12s %lu", vmstat_text[i], | |
689 | zone_page_state(zone, i)); | |
690 | ||
691 | seq_printf(m, | |
692 | "\n protection: (%lu", | |
693 | zone->lowmem_reserve[0]); | |
694 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) | |
695 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); | |
696 | seq_printf(m, | |
697 | ")" | |
698 | "\n pagesets"); | |
699 | for_each_online_cpu(i) { | |
700 | struct per_cpu_pageset *pageset; | |
701 | int j; | |
702 | ||
703 | pageset = zone_pcp(zone, i); | |
704 | for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) { | |
705 | seq_printf(m, | |
706 | "\n cpu: %i pcp: %i" | |
707 | "\n count: %i" | |
708 | "\n high: %i" | |
709 | "\n batch: %i", | |
710 | i, j, | |
711 | pageset->pcp[j].count, | |
712 | pageset->pcp[j].high, | |
713 | pageset->pcp[j].batch); | |
f6ac2354 | 714 | } |
df9ecaba | 715 | #ifdef CONFIG_SMP |
467c996c MG |
716 | seq_printf(m, "\n vm stats threshold: %d", |
717 | pageset->stat_threshold); | |
df9ecaba | 718 | #endif |
f6ac2354 | 719 | } |
467c996c MG |
720 | seq_printf(m, |
721 | "\n all_unreclaimable: %u" | |
722 | "\n prev_priority: %i" | |
723 | "\n start_pfn: %lu", | |
724 | zone->all_unreclaimable, | |
725 | zone->prev_priority, | |
726 | zone->zone_start_pfn); | |
727 | seq_putc(m, '\n'); | |
728 | } | |
729 | ||
730 | /* | |
731 | * Output information about zones in @pgdat. | |
732 | */ | |
733 | static int zoneinfo_show(struct seq_file *m, void *arg) | |
734 | { | |
735 | pg_data_t *pgdat = (pg_data_t *)arg; | |
736 | walk_zones_in_node(m, pgdat, zoneinfo_show_print); | |
f6ac2354 CL |
737 | return 0; |
738 | } | |
739 | ||
15ad7cdc | 740 | const struct seq_operations zoneinfo_op = { |
f6ac2354 CL |
741 | .start = frag_start, /* iterate over all zones. The same as in |
742 | * fragmentation. */ | |
743 | .next = frag_next, | |
744 | .stop = frag_stop, | |
745 | .show = zoneinfo_show, | |
746 | }; | |
747 | ||
748 | static void *vmstat_start(struct seq_file *m, loff_t *pos) | |
749 | { | |
2244b95a | 750 | unsigned long *v; |
f8891e5e CL |
751 | #ifdef CONFIG_VM_EVENT_COUNTERS |
752 | unsigned long *e; | |
753 | #endif | |
2244b95a | 754 | int i; |
f6ac2354 CL |
755 | |
756 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
757 | return NULL; | |
758 | ||
f8891e5e | 759 | #ifdef CONFIG_VM_EVENT_COUNTERS |
2244b95a | 760 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) |
f8891e5e CL |
761 | + sizeof(struct vm_event_state), GFP_KERNEL); |
762 | #else | |
763 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long), | |
764 | GFP_KERNEL); | |
765 | #endif | |
2244b95a CL |
766 | m->private = v; |
767 | if (!v) | |
f6ac2354 | 768 | return ERR_PTR(-ENOMEM); |
2244b95a CL |
769 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
770 | v[i] = global_page_state(i); | |
f8891e5e CL |
771 | #ifdef CONFIG_VM_EVENT_COUNTERS |
772 | e = v + NR_VM_ZONE_STAT_ITEMS; | |
773 | all_vm_events(e); | |
774 | e[PGPGIN] /= 2; /* sectors -> kbytes */ | |
775 | e[PGPGOUT] /= 2; | |
776 | #endif | |
2244b95a | 777 | return v + *pos; |
f6ac2354 CL |
778 | } |
779 | ||
780 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) | |
781 | { | |
782 | (*pos)++; | |
783 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
784 | return NULL; | |
785 | return (unsigned long *)m->private + *pos; | |
786 | } | |
787 | ||
788 | static int vmstat_show(struct seq_file *m, void *arg) | |
789 | { | |
790 | unsigned long *l = arg; | |
791 | unsigned long off = l - (unsigned long *)m->private; | |
792 | ||
793 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); | |
794 | return 0; | |
795 | } | |
796 | ||
797 | static void vmstat_stop(struct seq_file *m, void *arg) | |
798 | { | |
799 | kfree(m->private); | |
800 | m->private = NULL; | |
801 | } | |
802 | ||
15ad7cdc | 803 | const struct seq_operations vmstat_op = { |
f6ac2354 CL |
804 | .start = vmstat_start, |
805 | .next = vmstat_next, | |
806 | .stop = vmstat_stop, | |
807 | .show = vmstat_show, | |
808 | }; | |
809 | ||
810 | #endif /* CONFIG_PROC_FS */ | |
811 | ||
df9ecaba | 812 | #ifdef CONFIG_SMP |
d1187ed2 | 813 | static DEFINE_PER_CPU(struct delayed_work, vmstat_work); |
77461ab3 | 814 | int sysctl_stat_interval __read_mostly = HZ; |
d1187ed2 CL |
815 | |
816 | static void vmstat_update(struct work_struct *w) | |
817 | { | |
818 | refresh_cpu_vm_stats(smp_processor_id()); | |
77461ab3 CL |
819 | schedule_delayed_work(&__get_cpu_var(vmstat_work), |
820 | sysctl_stat_interval); | |
d1187ed2 CL |
821 | } |
822 | ||
823 | static void __devinit start_cpu_timer(int cpu) | |
824 | { | |
825 | struct delayed_work *vmstat_work = &per_cpu(vmstat_work, cpu); | |
826 | ||
39bf6270 | 827 | INIT_DELAYED_WORK_DEFERRABLE(vmstat_work, vmstat_update); |
d1187ed2 CL |
828 | schedule_delayed_work_on(cpu, vmstat_work, HZ + cpu); |
829 | } | |
830 | ||
df9ecaba CL |
831 | /* |
832 | * Use the cpu notifier to insure that the thresholds are recalculated | |
833 | * when necessary. | |
834 | */ | |
835 | static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb, | |
836 | unsigned long action, | |
837 | void *hcpu) | |
838 | { | |
d1187ed2 CL |
839 | long cpu = (long)hcpu; |
840 | ||
df9ecaba | 841 | switch (action) { |
d1187ed2 CL |
842 | case CPU_ONLINE: |
843 | case CPU_ONLINE_FROZEN: | |
844 | start_cpu_timer(cpu); | |
845 | break; | |
846 | case CPU_DOWN_PREPARE: | |
847 | case CPU_DOWN_PREPARE_FROZEN: | |
848 | cancel_rearming_delayed_work(&per_cpu(vmstat_work, cpu)); | |
849 | per_cpu(vmstat_work, cpu).work.func = NULL; | |
850 | break; | |
851 | case CPU_DOWN_FAILED: | |
852 | case CPU_DOWN_FAILED_FROZEN: | |
853 | start_cpu_timer(cpu); | |
854 | break; | |
ce421c79 | 855 | case CPU_DEAD: |
8bb78442 | 856 | case CPU_DEAD_FROZEN: |
ce421c79 AW |
857 | refresh_zone_stat_thresholds(); |
858 | break; | |
859 | default: | |
860 | break; | |
df9ecaba CL |
861 | } |
862 | return NOTIFY_OK; | |
863 | } | |
864 | ||
865 | static struct notifier_block __cpuinitdata vmstat_notifier = | |
866 | { &vmstat_cpuup_callback, NULL, 0 }; | |
867 | ||
868 | int __init setup_vmstat(void) | |
869 | { | |
d1187ed2 CL |
870 | int cpu; |
871 | ||
df9ecaba CL |
872 | refresh_zone_stat_thresholds(); |
873 | register_cpu_notifier(&vmstat_notifier); | |
d1187ed2 CL |
874 | |
875 | for_each_online_cpu(cpu) | |
876 | start_cpu_timer(cpu); | |
df9ecaba CL |
877 | return 0; |
878 | } | |
879 | module_init(setup_vmstat) | |
880 | #endif |