Commit | Line | Data |
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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> |
2244b95a | 13 | #include <linux/module.h> |
df9ecaba | 14 | #include <linux/cpu.h> |
f6ac2354 | 15 | |
f6ac2354 CL |
16 | void __get_zone_counts(unsigned long *active, unsigned long *inactive, |
17 | unsigned long *free, struct pglist_data *pgdat) | |
18 | { | |
c8785385 CL |
19 | *active = node_page_state(pgdat->node_id, NR_ACTIVE); |
20 | *inactive = node_page_state(pgdat->node_id, NR_INACTIVE); | |
d23ad423 | 21 | *free = node_page_state(pgdat->node_id, NR_FREE_PAGES); |
f6ac2354 CL |
22 | } |
23 | ||
24 | void get_zone_counts(unsigned long *active, | |
25 | unsigned long *inactive, unsigned long *free) | |
26 | { | |
c8785385 CL |
27 | *active = global_page_state(NR_ACTIVE); |
28 | *inactive = global_page_state(NR_INACTIVE); | |
d23ad423 | 29 | *free = global_page_state(NR_FREE_PAGES); |
f6ac2354 CL |
30 | } |
31 | ||
f8891e5e CL |
32 | #ifdef CONFIG_VM_EVENT_COUNTERS |
33 | DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}}; | |
34 | EXPORT_PER_CPU_SYMBOL(vm_event_states); | |
35 | ||
36 | static void sum_vm_events(unsigned long *ret, cpumask_t *cpumask) | |
37 | { | |
38 | int cpu = 0; | |
39 | int i; | |
40 | ||
41 | memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long)); | |
42 | ||
43 | cpu = first_cpu(*cpumask); | |
44 | while (cpu < NR_CPUS) { | |
45 | struct vm_event_state *this = &per_cpu(vm_event_states, cpu); | |
46 | ||
47 | cpu = next_cpu(cpu, *cpumask); | |
48 | ||
49 | if (cpu < NR_CPUS) | |
50 | prefetch(&per_cpu(vm_event_states, cpu)); | |
51 | ||
52 | ||
53 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) | |
54 | ret[i] += this->event[i]; | |
55 | } | |
56 | } | |
57 | ||
58 | /* | |
59 | * Accumulate the vm event counters across all CPUs. | |
60 | * The result is unavoidably approximate - it can change | |
61 | * during and after execution of this function. | |
62 | */ | |
63 | void all_vm_events(unsigned long *ret) | |
64 | { | |
65 | sum_vm_events(ret, &cpu_online_map); | |
66 | } | |
32dd66fc | 67 | EXPORT_SYMBOL_GPL(all_vm_events); |
f8891e5e CL |
68 | |
69 | #ifdef CONFIG_HOTPLUG | |
70 | /* | |
71 | * Fold the foreign cpu events into our own. | |
72 | * | |
73 | * This is adding to the events on one processor | |
74 | * but keeps the global counts constant. | |
75 | */ | |
76 | void vm_events_fold_cpu(int cpu) | |
77 | { | |
78 | struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu); | |
79 | int i; | |
80 | ||
81 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) { | |
82 | count_vm_events(i, fold_state->event[i]); | |
83 | fold_state->event[i] = 0; | |
84 | } | |
85 | } | |
86 | #endif /* CONFIG_HOTPLUG */ | |
87 | ||
88 | #endif /* CONFIG_VM_EVENT_COUNTERS */ | |
89 | ||
2244b95a CL |
90 | /* |
91 | * Manage combined zone based / global counters | |
92 | * | |
93 | * vm_stat contains the global counters | |
94 | */ | |
95 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
96 | EXPORT_SYMBOL(vm_stat); | |
97 | ||
98 | #ifdef CONFIG_SMP | |
99 | ||
df9ecaba CL |
100 | static int calculate_threshold(struct zone *zone) |
101 | { | |
102 | int threshold; | |
103 | int mem; /* memory in 128 MB units */ | |
104 | ||
105 | /* | |
106 | * The threshold scales with the number of processors and the amount | |
107 | * of memory per zone. More memory means that we can defer updates for | |
108 | * longer, more processors could lead to more contention. | |
109 | * fls() is used to have a cheap way of logarithmic scaling. | |
110 | * | |
111 | * Some sample thresholds: | |
112 | * | |
113 | * Threshold Processors (fls) Zonesize fls(mem+1) | |
114 | * ------------------------------------------------------------------ | |
115 | * 8 1 1 0.9-1 GB 4 | |
116 | * 16 2 2 0.9-1 GB 4 | |
117 | * 20 2 2 1-2 GB 5 | |
118 | * 24 2 2 2-4 GB 6 | |
119 | * 28 2 2 4-8 GB 7 | |
120 | * 32 2 2 8-16 GB 8 | |
121 | * 4 2 2 <128M 1 | |
122 | * 30 4 3 2-4 GB 5 | |
123 | * 48 4 3 8-16 GB 8 | |
124 | * 32 8 4 1-2 GB 4 | |
125 | * 32 8 4 0.9-1GB 4 | |
126 | * 10 16 5 <128M 1 | |
127 | * 40 16 5 900M 4 | |
128 | * 70 64 7 2-4 GB 5 | |
129 | * 84 64 7 4-8 GB 6 | |
130 | * 108 512 9 4-8 GB 6 | |
131 | * 125 1024 10 8-16 GB 8 | |
132 | * 125 1024 10 16-32 GB 9 | |
133 | */ | |
134 | ||
135 | mem = zone->present_pages >> (27 - PAGE_SHIFT); | |
136 | ||
137 | threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem)); | |
138 | ||
139 | /* | |
140 | * Maximum threshold is 125 | |
141 | */ | |
142 | threshold = min(125, threshold); | |
143 | ||
144 | return threshold; | |
145 | } | |
2244b95a CL |
146 | |
147 | /* | |
df9ecaba | 148 | * Refresh the thresholds for each zone. |
2244b95a | 149 | */ |
df9ecaba | 150 | static void refresh_zone_stat_thresholds(void) |
2244b95a | 151 | { |
df9ecaba CL |
152 | struct zone *zone; |
153 | int cpu; | |
154 | int threshold; | |
155 | ||
156 | for_each_zone(zone) { | |
157 | ||
158 | if (!zone->present_pages) | |
159 | continue; | |
160 | ||
161 | threshold = calculate_threshold(zone); | |
162 | ||
163 | for_each_online_cpu(cpu) | |
164 | zone_pcp(zone, cpu)->stat_threshold = threshold; | |
165 | } | |
2244b95a CL |
166 | } |
167 | ||
168 | /* | |
169 | * For use when we know that interrupts are disabled. | |
170 | */ | |
171 | void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
172 | int delta) | |
173 | { | |
df9ecaba CL |
174 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
175 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
176 | long x; |
177 | ||
2244b95a CL |
178 | x = delta + *p; |
179 | ||
df9ecaba | 180 | if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) { |
2244b95a CL |
181 | zone_page_state_add(x, zone, item); |
182 | x = 0; | |
183 | } | |
2244b95a CL |
184 | *p = x; |
185 | } | |
186 | EXPORT_SYMBOL(__mod_zone_page_state); | |
187 | ||
188 | /* | |
189 | * For an unknown interrupt state | |
190 | */ | |
191 | void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
192 | int delta) | |
193 | { | |
194 | unsigned long flags; | |
195 | ||
196 | local_irq_save(flags); | |
197 | __mod_zone_page_state(zone, item, delta); | |
198 | local_irq_restore(flags); | |
199 | } | |
200 | EXPORT_SYMBOL(mod_zone_page_state); | |
201 | ||
202 | /* | |
203 | * Optimized increment and decrement functions. | |
204 | * | |
205 | * These are only for a single page and therefore can take a struct page * | |
206 | * argument instead of struct zone *. This allows the inclusion of the code | |
207 | * generated for page_zone(page) into the optimized functions. | |
208 | * | |
209 | * No overflow check is necessary and therefore the differential can be | |
210 | * incremented or decremented in place which may allow the compilers to | |
211 | * generate better code. | |
2244b95a CL |
212 | * The increment or decrement is known and therefore one boundary check can |
213 | * be omitted. | |
214 | * | |
df9ecaba CL |
215 | * NOTE: These functions are very performance sensitive. Change only |
216 | * with care. | |
217 | * | |
2244b95a CL |
218 | * Some processors have inc/dec instructions that are atomic vs an interrupt. |
219 | * However, the code must first determine the differential location in a zone | |
220 | * based on the processor number and then inc/dec the counter. There is no | |
221 | * guarantee without disabling preemption that the processor will not change | |
222 | * in between and therefore the atomicity vs. interrupt cannot be exploited | |
223 | * in a useful way here. | |
224 | */ | |
c8785385 | 225 | void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 226 | { |
df9ecaba CL |
227 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
228 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
229 | |
230 | (*p)++; | |
231 | ||
df9ecaba CL |
232 | if (unlikely(*p > pcp->stat_threshold)) { |
233 | int overstep = pcp->stat_threshold / 2; | |
234 | ||
235 | zone_page_state_add(*p + overstep, zone, item); | |
236 | *p = -overstep; | |
2244b95a CL |
237 | } |
238 | } | |
ca889e6c CL |
239 | |
240 | void __inc_zone_page_state(struct page *page, enum zone_stat_item item) | |
241 | { | |
242 | __inc_zone_state(page_zone(page), item); | |
243 | } | |
2244b95a CL |
244 | EXPORT_SYMBOL(__inc_zone_page_state); |
245 | ||
c8785385 | 246 | void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 247 | { |
df9ecaba CL |
248 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
249 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
250 | |
251 | (*p)--; | |
252 | ||
df9ecaba CL |
253 | if (unlikely(*p < - pcp->stat_threshold)) { |
254 | int overstep = pcp->stat_threshold / 2; | |
255 | ||
256 | zone_page_state_add(*p - overstep, zone, item); | |
257 | *p = overstep; | |
2244b95a CL |
258 | } |
259 | } | |
c8785385 CL |
260 | |
261 | void __dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
262 | { | |
263 | __dec_zone_state(page_zone(page), item); | |
264 | } | |
2244b95a CL |
265 | EXPORT_SYMBOL(__dec_zone_page_state); |
266 | ||
ca889e6c CL |
267 | void inc_zone_state(struct zone *zone, enum zone_stat_item item) |
268 | { | |
269 | unsigned long flags; | |
270 | ||
271 | local_irq_save(flags); | |
272 | __inc_zone_state(zone, item); | |
273 | local_irq_restore(flags); | |
274 | } | |
275 | ||
2244b95a CL |
276 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
277 | { | |
278 | unsigned long flags; | |
279 | struct zone *zone; | |
2244b95a CL |
280 | |
281 | zone = page_zone(page); | |
282 | local_irq_save(flags); | |
ca889e6c | 283 | __inc_zone_state(zone, item); |
2244b95a CL |
284 | local_irq_restore(flags); |
285 | } | |
286 | EXPORT_SYMBOL(inc_zone_page_state); | |
287 | ||
288 | void dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
289 | { | |
290 | unsigned long flags; | |
2244b95a | 291 | |
2244b95a | 292 | local_irq_save(flags); |
a302eb4e | 293 | __dec_zone_page_state(page, item); |
2244b95a CL |
294 | local_irq_restore(flags); |
295 | } | |
296 | EXPORT_SYMBOL(dec_zone_page_state); | |
297 | ||
298 | /* | |
299 | * Update the zone counters for one cpu. | |
300 | */ | |
301 | void refresh_cpu_vm_stats(int cpu) | |
302 | { | |
303 | struct zone *zone; | |
304 | int i; | |
305 | unsigned long flags; | |
306 | ||
307 | for_each_zone(zone) { | |
308 | struct per_cpu_pageset *pcp; | |
309 | ||
39bbcb8f CL |
310 | if (!populated_zone(zone)) |
311 | continue; | |
312 | ||
2244b95a CL |
313 | pcp = zone_pcp(zone, cpu); |
314 | ||
315 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
316 | if (pcp->vm_stat_diff[i]) { | |
317 | local_irq_save(flags); | |
318 | zone_page_state_add(pcp->vm_stat_diff[i], | |
319 | zone, i); | |
320 | pcp->vm_stat_diff[i] = 0; | |
321 | local_irq_restore(flags); | |
322 | } | |
323 | } | |
324 | } | |
325 | ||
326 | static void __refresh_cpu_vm_stats(void *dummy) | |
327 | { | |
328 | refresh_cpu_vm_stats(smp_processor_id()); | |
329 | } | |
330 | ||
331 | /* | |
332 | * Consolidate all counters. | |
333 | * | |
334 | * Note that the result is less inaccurate but still inaccurate | |
335 | * if concurrent processes are allowed to run. | |
336 | */ | |
337 | void refresh_vm_stats(void) | |
338 | { | |
339 | on_each_cpu(__refresh_cpu_vm_stats, NULL, 0, 1); | |
340 | } | |
341 | EXPORT_SYMBOL(refresh_vm_stats); | |
342 | ||
343 | #endif | |
344 | ||
ca889e6c CL |
345 | #ifdef CONFIG_NUMA |
346 | /* | |
347 | * zonelist = the list of zones passed to the allocator | |
348 | * z = the zone from which the allocation occurred. | |
349 | * | |
350 | * Must be called with interrupts disabled. | |
351 | */ | |
352 | void zone_statistics(struct zonelist *zonelist, struct zone *z) | |
353 | { | |
354 | if (z->zone_pgdat == zonelist->zones[0]->zone_pgdat) { | |
355 | __inc_zone_state(z, NUMA_HIT); | |
356 | } else { | |
357 | __inc_zone_state(z, NUMA_MISS); | |
358 | __inc_zone_state(zonelist->zones[0], NUMA_FOREIGN); | |
359 | } | |
5d292343 | 360 | if (z->node == numa_node_id()) |
ca889e6c CL |
361 | __inc_zone_state(z, NUMA_LOCAL); |
362 | else | |
363 | __inc_zone_state(z, NUMA_OTHER); | |
364 | } | |
365 | #endif | |
366 | ||
f6ac2354 CL |
367 | #ifdef CONFIG_PROC_FS |
368 | ||
369 | #include <linux/seq_file.h> | |
370 | ||
371 | static void *frag_start(struct seq_file *m, loff_t *pos) | |
372 | { | |
373 | pg_data_t *pgdat; | |
374 | loff_t node = *pos; | |
375 | for (pgdat = first_online_pgdat(); | |
376 | pgdat && node; | |
377 | pgdat = next_online_pgdat(pgdat)) | |
378 | --node; | |
379 | ||
380 | return pgdat; | |
381 | } | |
382 | ||
383 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) | |
384 | { | |
385 | pg_data_t *pgdat = (pg_data_t *)arg; | |
386 | ||
387 | (*pos)++; | |
388 | return next_online_pgdat(pgdat); | |
389 | } | |
390 | ||
391 | static void frag_stop(struct seq_file *m, void *arg) | |
392 | { | |
393 | } | |
394 | ||
395 | /* | |
396 | * This walks the free areas for each zone. | |
397 | */ | |
398 | static int frag_show(struct seq_file *m, void *arg) | |
399 | { | |
400 | pg_data_t *pgdat = (pg_data_t *)arg; | |
401 | struct zone *zone; | |
402 | struct zone *node_zones = pgdat->node_zones; | |
403 | unsigned long flags; | |
404 | int order; | |
405 | ||
406 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { | |
407 | if (!populated_zone(zone)) | |
408 | continue; | |
409 | ||
410 | spin_lock_irqsave(&zone->lock, flags); | |
411 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
412 | for (order = 0; order < MAX_ORDER; ++order) | |
413 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); | |
414 | spin_unlock_irqrestore(&zone->lock, flags); | |
415 | seq_putc(m, '\n'); | |
416 | } | |
417 | return 0; | |
418 | } | |
419 | ||
15ad7cdc | 420 | const struct seq_operations fragmentation_op = { |
f6ac2354 CL |
421 | .start = frag_start, |
422 | .next = frag_next, | |
423 | .stop = frag_stop, | |
424 | .show = frag_show, | |
425 | }; | |
426 | ||
27bf71c2 CL |
427 | #ifdef CONFIG_ZONE_DMA32 |
428 | #define TEXT_FOR_DMA32(xx) xx "_dma32", | |
429 | #else | |
430 | #define TEXT_FOR_DMA32(xx) | |
431 | #endif | |
432 | ||
433 | #ifdef CONFIG_HIGHMEM | |
434 | #define TEXT_FOR_HIGHMEM(xx) xx "_high", | |
435 | #else | |
436 | #define TEXT_FOR_HIGHMEM(xx) | |
437 | #endif | |
438 | ||
439 | #define TEXTS_FOR_ZONES(xx) xx "_dma", TEXT_FOR_DMA32(xx) xx "_normal", \ | |
440 | TEXT_FOR_HIGHMEM(xx) | |
441 | ||
15ad7cdc | 442 | static const char * const vmstat_text[] = { |
2244b95a | 443 | /* Zoned VM counters */ |
d23ad423 | 444 | "nr_free_pages", |
c8785385 CL |
445 | "nr_active", |
446 | "nr_inactive", | |
f3dbd344 | 447 | "nr_anon_pages", |
65ba55f5 | 448 | "nr_mapped", |
347ce434 | 449 | "nr_file_pages", |
972d1a7b CL |
450 | "nr_slab_reclaimable", |
451 | "nr_slab_unreclaimable", | |
df849a15 | 452 | "nr_page_table_pages", |
b1e7a8fd | 453 | "nr_dirty", |
ce866b34 | 454 | "nr_writeback", |
f6ac2354 | 455 | "nr_unstable", |
d2c5e30c | 456 | "nr_bounce", |
e129b5c2 | 457 | "nr_vmscan_write", |
f6ac2354 | 458 | |
ca889e6c CL |
459 | #ifdef CONFIG_NUMA |
460 | "numa_hit", | |
461 | "numa_miss", | |
462 | "numa_foreign", | |
463 | "numa_interleave", | |
464 | "numa_local", | |
465 | "numa_other", | |
466 | #endif | |
467 | ||
f8891e5e | 468 | #ifdef CONFIG_VM_EVENT_COUNTERS |
f6ac2354 CL |
469 | "pgpgin", |
470 | "pgpgout", | |
471 | "pswpin", | |
472 | "pswpout", | |
473 | ||
27bf71c2 | 474 | TEXTS_FOR_ZONES("pgalloc") |
f6ac2354 CL |
475 | |
476 | "pgfree", | |
477 | "pgactivate", | |
478 | "pgdeactivate", | |
479 | ||
480 | "pgfault", | |
481 | "pgmajfault", | |
482 | ||
27bf71c2 CL |
483 | TEXTS_FOR_ZONES("pgrefill") |
484 | TEXTS_FOR_ZONES("pgsteal") | |
485 | TEXTS_FOR_ZONES("pgscan_kswapd") | |
486 | TEXTS_FOR_ZONES("pgscan_direct") | |
f6ac2354 CL |
487 | |
488 | "pginodesteal", | |
489 | "slabs_scanned", | |
490 | "kswapd_steal", | |
491 | "kswapd_inodesteal", | |
492 | "pageoutrun", | |
493 | "allocstall", | |
494 | ||
495 | "pgrotated", | |
f8891e5e | 496 | #endif |
f6ac2354 CL |
497 | }; |
498 | ||
499 | /* | |
500 | * Output information about zones in @pgdat. | |
501 | */ | |
502 | static int zoneinfo_show(struct seq_file *m, void *arg) | |
503 | { | |
504 | pg_data_t *pgdat = arg; | |
505 | struct zone *zone; | |
506 | struct zone *node_zones = pgdat->node_zones; | |
507 | unsigned long flags; | |
508 | ||
509 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; zone++) { | |
510 | int i; | |
511 | ||
512 | if (!populated_zone(zone)) | |
513 | continue; | |
514 | ||
515 | spin_lock_irqsave(&zone->lock, flags); | |
516 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); | |
517 | seq_printf(m, | |
518 | "\n pages free %lu" | |
519 | "\n min %lu" | |
520 | "\n low %lu" | |
521 | "\n high %lu" | |
f6ac2354 CL |
522 | "\n scanned %lu (a: %lu i: %lu)" |
523 | "\n spanned %lu" | |
524 | "\n present %lu", | |
d23ad423 | 525 | zone_page_state(zone, NR_FREE_PAGES), |
f6ac2354 CL |
526 | zone->pages_min, |
527 | zone->pages_low, | |
528 | zone->pages_high, | |
f6ac2354 CL |
529 | zone->pages_scanned, |
530 | zone->nr_scan_active, zone->nr_scan_inactive, | |
531 | zone->spanned_pages, | |
532 | zone->present_pages); | |
2244b95a CL |
533 | |
534 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
535 | seq_printf(m, "\n %-12s %lu", vmstat_text[i], | |
536 | zone_page_state(zone, i)); | |
537 | ||
f6ac2354 CL |
538 | seq_printf(m, |
539 | "\n protection: (%lu", | |
540 | zone->lowmem_reserve[0]); | |
541 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) | |
542 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); | |
543 | seq_printf(m, | |
544 | ")" | |
545 | "\n pagesets"); | |
546 | for_each_online_cpu(i) { | |
547 | struct per_cpu_pageset *pageset; | |
548 | int j; | |
549 | ||
550 | pageset = zone_pcp(zone, i); | |
f6ac2354 CL |
551 | for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) { |
552 | seq_printf(m, | |
553 | "\n cpu: %i pcp: %i" | |
554 | "\n count: %i" | |
555 | "\n high: %i" | |
556 | "\n batch: %i", | |
557 | i, j, | |
558 | pageset->pcp[j].count, | |
559 | pageset->pcp[j].high, | |
560 | pageset->pcp[j].batch); | |
561 | } | |
df9ecaba CL |
562 | #ifdef CONFIG_SMP |
563 | seq_printf(m, "\n vm stats threshold: %d", | |
564 | pageset->stat_threshold); | |
565 | #endif | |
f6ac2354 CL |
566 | } |
567 | seq_printf(m, | |
568 | "\n all_unreclaimable: %u" | |
569 | "\n prev_priority: %i" | |
f6ac2354 CL |
570 | "\n start_pfn: %lu", |
571 | zone->all_unreclaimable, | |
572 | zone->prev_priority, | |
f6ac2354 CL |
573 | zone->zone_start_pfn); |
574 | spin_unlock_irqrestore(&zone->lock, flags); | |
575 | seq_putc(m, '\n'); | |
576 | } | |
577 | return 0; | |
578 | } | |
579 | ||
15ad7cdc | 580 | const struct seq_operations zoneinfo_op = { |
f6ac2354 CL |
581 | .start = frag_start, /* iterate over all zones. The same as in |
582 | * fragmentation. */ | |
583 | .next = frag_next, | |
584 | .stop = frag_stop, | |
585 | .show = zoneinfo_show, | |
586 | }; | |
587 | ||
588 | static void *vmstat_start(struct seq_file *m, loff_t *pos) | |
589 | { | |
2244b95a | 590 | unsigned long *v; |
f8891e5e CL |
591 | #ifdef CONFIG_VM_EVENT_COUNTERS |
592 | unsigned long *e; | |
593 | #endif | |
2244b95a | 594 | int i; |
f6ac2354 CL |
595 | |
596 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
597 | return NULL; | |
598 | ||
f8891e5e | 599 | #ifdef CONFIG_VM_EVENT_COUNTERS |
2244b95a | 600 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) |
f8891e5e CL |
601 | + sizeof(struct vm_event_state), GFP_KERNEL); |
602 | #else | |
603 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long), | |
604 | GFP_KERNEL); | |
605 | #endif | |
2244b95a CL |
606 | m->private = v; |
607 | if (!v) | |
f6ac2354 | 608 | return ERR_PTR(-ENOMEM); |
2244b95a CL |
609 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
610 | v[i] = global_page_state(i); | |
f8891e5e CL |
611 | #ifdef CONFIG_VM_EVENT_COUNTERS |
612 | e = v + NR_VM_ZONE_STAT_ITEMS; | |
613 | all_vm_events(e); | |
614 | e[PGPGIN] /= 2; /* sectors -> kbytes */ | |
615 | e[PGPGOUT] /= 2; | |
616 | #endif | |
2244b95a | 617 | return v + *pos; |
f6ac2354 CL |
618 | } |
619 | ||
620 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) | |
621 | { | |
622 | (*pos)++; | |
623 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
624 | return NULL; | |
625 | return (unsigned long *)m->private + *pos; | |
626 | } | |
627 | ||
628 | static int vmstat_show(struct seq_file *m, void *arg) | |
629 | { | |
630 | unsigned long *l = arg; | |
631 | unsigned long off = l - (unsigned long *)m->private; | |
632 | ||
633 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); | |
634 | return 0; | |
635 | } | |
636 | ||
637 | static void vmstat_stop(struct seq_file *m, void *arg) | |
638 | { | |
639 | kfree(m->private); | |
640 | m->private = NULL; | |
641 | } | |
642 | ||
15ad7cdc | 643 | const struct seq_operations vmstat_op = { |
f6ac2354 CL |
644 | .start = vmstat_start, |
645 | .next = vmstat_next, | |
646 | .stop = vmstat_stop, | |
647 | .show = vmstat_show, | |
648 | }; | |
649 | ||
650 | #endif /* CONFIG_PROC_FS */ | |
651 | ||
df9ecaba CL |
652 | #ifdef CONFIG_SMP |
653 | /* | |
654 | * Use the cpu notifier to insure that the thresholds are recalculated | |
655 | * when necessary. | |
656 | */ | |
657 | static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb, | |
658 | unsigned long action, | |
659 | void *hcpu) | |
660 | { | |
661 | switch (action) { | |
ce421c79 AW |
662 | case CPU_UP_PREPARE: |
663 | case CPU_UP_CANCELED: | |
664 | case CPU_DEAD: | |
665 | refresh_zone_stat_thresholds(); | |
666 | break; | |
667 | default: | |
668 | break; | |
df9ecaba CL |
669 | } |
670 | return NOTIFY_OK; | |
671 | } | |
672 | ||
673 | static struct notifier_block __cpuinitdata vmstat_notifier = | |
674 | { &vmstat_cpuup_callback, NULL, 0 }; | |
675 | ||
676 | int __init setup_vmstat(void) | |
677 | { | |
678 | refresh_zone_stat_thresholds(); | |
679 | register_cpu_notifier(&vmstat_notifier); | |
680 | return 0; | |
681 | } | |
682 | module_init(setup_vmstat) | |
683 | #endif |