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 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/mm.h> | |
2244b95a | 14 | #include <linux/module.h> |
df9ecaba | 15 | #include <linux/cpu.h> |
f6ac2354 | 16 | |
f6ac2354 CL |
17 | void __get_zone_counts(unsigned long *active, unsigned long *inactive, |
18 | unsigned long *free, struct pglist_data *pgdat) | |
19 | { | |
20 | struct zone *zones = pgdat->node_zones; | |
21 | int i; | |
22 | ||
23 | *active = 0; | |
24 | *inactive = 0; | |
25 | *free = 0; | |
26 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
27 | *active += zones[i].nr_active; | |
28 | *inactive += zones[i].nr_inactive; | |
29 | *free += zones[i].free_pages; | |
30 | } | |
31 | } | |
32 | ||
33 | void get_zone_counts(unsigned long *active, | |
34 | unsigned long *inactive, unsigned long *free) | |
35 | { | |
36 | struct pglist_data *pgdat; | |
37 | ||
38 | *active = 0; | |
39 | *inactive = 0; | |
40 | *free = 0; | |
41 | for_each_online_pgdat(pgdat) { | |
42 | unsigned long l, m, n; | |
43 | __get_zone_counts(&l, &m, &n, pgdat); | |
44 | *active += l; | |
45 | *inactive += m; | |
46 | *free += n; | |
47 | } | |
48 | } | |
49 | ||
f8891e5e CL |
50 | #ifdef CONFIG_VM_EVENT_COUNTERS |
51 | DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}}; | |
52 | EXPORT_PER_CPU_SYMBOL(vm_event_states); | |
53 | ||
54 | static void sum_vm_events(unsigned long *ret, cpumask_t *cpumask) | |
55 | { | |
56 | int cpu = 0; | |
57 | int i; | |
58 | ||
59 | memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long)); | |
60 | ||
61 | cpu = first_cpu(*cpumask); | |
62 | while (cpu < NR_CPUS) { | |
63 | struct vm_event_state *this = &per_cpu(vm_event_states, cpu); | |
64 | ||
65 | cpu = next_cpu(cpu, *cpumask); | |
66 | ||
67 | if (cpu < NR_CPUS) | |
68 | prefetch(&per_cpu(vm_event_states, cpu)); | |
69 | ||
70 | ||
71 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) | |
72 | ret[i] += this->event[i]; | |
73 | } | |
74 | } | |
75 | ||
76 | /* | |
77 | * Accumulate the vm event counters across all CPUs. | |
78 | * The result is unavoidably approximate - it can change | |
79 | * during and after execution of this function. | |
80 | */ | |
81 | void all_vm_events(unsigned long *ret) | |
82 | { | |
83 | sum_vm_events(ret, &cpu_online_map); | |
84 | } | |
32dd66fc | 85 | EXPORT_SYMBOL_GPL(all_vm_events); |
f8891e5e CL |
86 | |
87 | #ifdef CONFIG_HOTPLUG | |
88 | /* | |
89 | * Fold the foreign cpu events into our own. | |
90 | * | |
91 | * This is adding to the events on one processor | |
92 | * but keeps the global counts constant. | |
93 | */ | |
94 | void vm_events_fold_cpu(int cpu) | |
95 | { | |
96 | struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu); | |
97 | int i; | |
98 | ||
99 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) { | |
100 | count_vm_events(i, fold_state->event[i]); | |
101 | fold_state->event[i] = 0; | |
102 | } | |
103 | } | |
104 | #endif /* CONFIG_HOTPLUG */ | |
105 | ||
106 | #endif /* CONFIG_VM_EVENT_COUNTERS */ | |
107 | ||
2244b95a CL |
108 | /* |
109 | * Manage combined zone based / global counters | |
110 | * | |
111 | * vm_stat contains the global counters | |
112 | */ | |
113 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
114 | EXPORT_SYMBOL(vm_stat); | |
115 | ||
116 | #ifdef CONFIG_SMP | |
117 | ||
df9ecaba CL |
118 | static int calculate_threshold(struct zone *zone) |
119 | { | |
120 | int threshold; | |
121 | int mem; /* memory in 128 MB units */ | |
122 | ||
123 | /* | |
124 | * The threshold scales with the number of processors and the amount | |
125 | * of memory per zone. More memory means that we can defer updates for | |
126 | * longer, more processors could lead to more contention. | |
127 | * fls() is used to have a cheap way of logarithmic scaling. | |
128 | * | |
129 | * Some sample thresholds: | |
130 | * | |
131 | * Threshold Processors (fls) Zonesize fls(mem+1) | |
132 | * ------------------------------------------------------------------ | |
133 | * 8 1 1 0.9-1 GB 4 | |
134 | * 16 2 2 0.9-1 GB 4 | |
135 | * 20 2 2 1-2 GB 5 | |
136 | * 24 2 2 2-4 GB 6 | |
137 | * 28 2 2 4-8 GB 7 | |
138 | * 32 2 2 8-16 GB 8 | |
139 | * 4 2 2 <128M 1 | |
140 | * 30 4 3 2-4 GB 5 | |
141 | * 48 4 3 8-16 GB 8 | |
142 | * 32 8 4 1-2 GB 4 | |
143 | * 32 8 4 0.9-1GB 4 | |
144 | * 10 16 5 <128M 1 | |
145 | * 40 16 5 900M 4 | |
146 | * 70 64 7 2-4 GB 5 | |
147 | * 84 64 7 4-8 GB 6 | |
148 | * 108 512 9 4-8 GB 6 | |
149 | * 125 1024 10 8-16 GB 8 | |
150 | * 125 1024 10 16-32 GB 9 | |
151 | */ | |
152 | ||
153 | mem = zone->present_pages >> (27 - PAGE_SHIFT); | |
154 | ||
155 | threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem)); | |
156 | ||
157 | /* | |
158 | * Maximum threshold is 125 | |
159 | */ | |
160 | threshold = min(125, threshold); | |
161 | ||
162 | return threshold; | |
163 | } | |
2244b95a CL |
164 | |
165 | /* | |
df9ecaba | 166 | * Refresh the thresholds for each zone. |
2244b95a | 167 | */ |
df9ecaba | 168 | static void refresh_zone_stat_thresholds(void) |
2244b95a | 169 | { |
df9ecaba CL |
170 | struct zone *zone; |
171 | int cpu; | |
172 | int threshold; | |
173 | ||
174 | for_each_zone(zone) { | |
175 | ||
176 | if (!zone->present_pages) | |
177 | continue; | |
178 | ||
179 | threshold = calculate_threshold(zone); | |
180 | ||
181 | for_each_online_cpu(cpu) | |
182 | zone_pcp(zone, cpu)->stat_threshold = threshold; | |
183 | } | |
2244b95a CL |
184 | } |
185 | ||
186 | /* | |
187 | * For use when we know that interrupts are disabled. | |
188 | */ | |
189 | void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
190 | int delta) | |
191 | { | |
df9ecaba CL |
192 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
193 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
194 | long x; |
195 | ||
2244b95a CL |
196 | x = delta + *p; |
197 | ||
df9ecaba | 198 | if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) { |
2244b95a CL |
199 | zone_page_state_add(x, zone, item); |
200 | x = 0; | |
201 | } | |
2244b95a CL |
202 | *p = x; |
203 | } | |
204 | EXPORT_SYMBOL(__mod_zone_page_state); | |
205 | ||
206 | /* | |
207 | * For an unknown interrupt state | |
208 | */ | |
209 | void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
210 | int delta) | |
211 | { | |
212 | unsigned long flags; | |
213 | ||
214 | local_irq_save(flags); | |
215 | __mod_zone_page_state(zone, item, delta); | |
216 | local_irq_restore(flags); | |
217 | } | |
218 | EXPORT_SYMBOL(mod_zone_page_state); | |
219 | ||
220 | /* | |
221 | * Optimized increment and decrement functions. | |
222 | * | |
223 | * These are only for a single page and therefore can take a struct page * | |
224 | * argument instead of struct zone *. This allows the inclusion of the code | |
225 | * generated for page_zone(page) into the optimized functions. | |
226 | * | |
227 | * No overflow check is necessary and therefore the differential can be | |
228 | * incremented or decremented in place which may allow the compilers to | |
229 | * generate better code. | |
2244b95a CL |
230 | * The increment or decrement is known and therefore one boundary check can |
231 | * be omitted. | |
232 | * | |
df9ecaba CL |
233 | * NOTE: These functions are very performance sensitive. Change only |
234 | * with care. | |
235 | * | |
2244b95a CL |
236 | * Some processors have inc/dec instructions that are atomic vs an interrupt. |
237 | * However, the code must first determine the differential location in a zone | |
238 | * based on the processor number and then inc/dec the counter. There is no | |
239 | * guarantee without disabling preemption that the processor will not change | |
240 | * in between and therefore the atomicity vs. interrupt cannot be exploited | |
241 | * in a useful way here. | |
242 | */ | |
ca889e6c | 243 | static void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 244 | { |
df9ecaba CL |
245 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
246 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
247 | |
248 | (*p)++; | |
249 | ||
df9ecaba CL |
250 | if (unlikely(*p > pcp->stat_threshold)) { |
251 | int overstep = pcp->stat_threshold / 2; | |
252 | ||
253 | zone_page_state_add(*p + overstep, zone, item); | |
254 | *p = -overstep; | |
2244b95a CL |
255 | } |
256 | } | |
ca889e6c CL |
257 | |
258 | void __inc_zone_page_state(struct page *page, enum zone_stat_item item) | |
259 | { | |
260 | __inc_zone_state(page_zone(page), item); | |
261 | } | |
2244b95a CL |
262 | EXPORT_SYMBOL(__inc_zone_page_state); |
263 | ||
264 | void __dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
265 | { | |
266 | struct zone *zone = page_zone(page); | |
df9ecaba CL |
267 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
268 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
269 | |
270 | (*p)--; | |
271 | ||
df9ecaba CL |
272 | if (unlikely(*p < - pcp->stat_threshold)) { |
273 | int overstep = pcp->stat_threshold / 2; | |
274 | ||
275 | zone_page_state_add(*p - overstep, zone, item); | |
276 | *p = overstep; | |
2244b95a CL |
277 | } |
278 | } | |
279 | EXPORT_SYMBOL(__dec_zone_page_state); | |
280 | ||
ca889e6c CL |
281 | void inc_zone_state(struct zone *zone, enum zone_stat_item item) |
282 | { | |
283 | unsigned long flags; | |
284 | ||
285 | local_irq_save(flags); | |
286 | __inc_zone_state(zone, item); | |
287 | local_irq_restore(flags); | |
288 | } | |
289 | ||
2244b95a CL |
290 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
291 | { | |
292 | unsigned long flags; | |
293 | struct zone *zone; | |
2244b95a CL |
294 | |
295 | zone = page_zone(page); | |
296 | local_irq_save(flags); | |
ca889e6c | 297 | __inc_zone_state(zone, item); |
2244b95a CL |
298 | local_irq_restore(flags); |
299 | } | |
300 | EXPORT_SYMBOL(inc_zone_page_state); | |
301 | ||
302 | void dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
303 | { | |
304 | unsigned long flags; | |
2244b95a | 305 | |
2244b95a | 306 | local_irq_save(flags); |
a302eb4e | 307 | __dec_zone_page_state(page, item); |
2244b95a CL |
308 | local_irq_restore(flags); |
309 | } | |
310 | EXPORT_SYMBOL(dec_zone_page_state); | |
311 | ||
312 | /* | |
313 | * Update the zone counters for one cpu. | |
314 | */ | |
315 | void refresh_cpu_vm_stats(int cpu) | |
316 | { | |
317 | struct zone *zone; | |
318 | int i; | |
319 | unsigned long flags; | |
320 | ||
321 | for_each_zone(zone) { | |
322 | struct per_cpu_pageset *pcp; | |
323 | ||
324 | pcp = zone_pcp(zone, cpu); | |
325 | ||
326 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
327 | if (pcp->vm_stat_diff[i]) { | |
328 | local_irq_save(flags); | |
329 | zone_page_state_add(pcp->vm_stat_diff[i], | |
330 | zone, i); | |
331 | pcp->vm_stat_diff[i] = 0; | |
332 | local_irq_restore(flags); | |
333 | } | |
334 | } | |
335 | } | |
336 | ||
337 | static void __refresh_cpu_vm_stats(void *dummy) | |
338 | { | |
339 | refresh_cpu_vm_stats(smp_processor_id()); | |
340 | } | |
341 | ||
342 | /* | |
343 | * Consolidate all counters. | |
344 | * | |
345 | * Note that the result is less inaccurate but still inaccurate | |
346 | * if concurrent processes are allowed to run. | |
347 | */ | |
348 | void refresh_vm_stats(void) | |
349 | { | |
350 | on_each_cpu(__refresh_cpu_vm_stats, NULL, 0, 1); | |
351 | } | |
352 | EXPORT_SYMBOL(refresh_vm_stats); | |
353 | ||
354 | #endif | |
355 | ||
ca889e6c CL |
356 | #ifdef CONFIG_NUMA |
357 | /* | |
358 | * zonelist = the list of zones passed to the allocator | |
359 | * z = the zone from which the allocation occurred. | |
360 | * | |
361 | * Must be called with interrupts disabled. | |
362 | */ | |
363 | void zone_statistics(struct zonelist *zonelist, struct zone *z) | |
364 | { | |
365 | if (z->zone_pgdat == zonelist->zones[0]->zone_pgdat) { | |
366 | __inc_zone_state(z, NUMA_HIT); | |
367 | } else { | |
368 | __inc_zone_state(z, NUMA_MISS); | |
369 | __inc_zone_state(zonelist->zones[0], NUMA_FOREIGN); | |
370 | } | |
371 | if (z->zone_pgdat == NODE_DATA(numa_node_id())) | |
372 | __inc_zone_state(z, NUMA_LOCAL); | |
373 | else | |
374 | __inc_zone_state(z, NUMA_OTHER); | |
375 | } | |
376 | #endif | |
377 | ||
f6ac2354 CL |
378 | #ifdef CONFIG_PROC_FS |
379 | ||
380 | #include <linux/seq_file.h> | |
381 | ||
382 | static void *frag_start(struct seq_file *m, loff_t *pos) | |
383 | { | |
384 | pg_data_t *pgdat; | |
385 | loff_t node = *pos; | |
386 | for (pgdat = first_online_pgdat(); | |
387 | pgdat && node; | |
388 | pgdat = next_online_pgdat(pgdat)) | |
389 | --node; | |
390 | ||
391 | return pgdat; | |
392 | } | |
393 | ||
394 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) | |
395 | { | |
396 | pg_data_t *pgdat = (pg_data_t *)arg; | |
397 | ||
398 | (*pos)++; | |
399 | return next_online_pgdat(pgdat); | |
400 | } | |
401 | ||
402 | static void frag_stop(struct seq_file *m, void *arg) | |
403 | { | |
404 | } | |
405 | ||
406 | /* | |
407 | * This walks the free areas for each zone. | |
408 | */ | |
409 | static int frag_show(struct seq_file *m, void *arg) | |
410 | { | |
411 | pg_data_t *pgdat = (pg_data_t *)arg; | |
412 | struct zone *zone; | |
413 | struct zone *node_zones = pgdat->node_zones; | |
414 | unsigned long flags; | |
415 | int order; | |
416 | ||
417 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { | |
418 | if (!populated_zone(zone)) | |
419 | continue; | |
420 | ||
421 | spin_lock_irqsave(&zone->lock, flags); | |
422 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
423 | for (order = 0; order < MAX_ORDER; ++order) | |
424 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); | |
425 | spin_unlock_irqrestore(&zone->lock, flags); | |
426 | seq_putc(m, '\n'); | |
427 | } | |
428 | return 0; | |
429 | } | |
430 | ||
431 | struct seq_operations fragmentation_op = { | |
432 | .start = frag_start, | |
433 | .next = frag_next, | |
434 | .stop = frag_stop, | |
435 | .show = frag_show, | |
436 | }; | |
437 | ||
27bf71c2 CL |
438 | #ifdef CONFIG_ZONE_DMA32 |
439 | #define TEXT_FOR_DMA32(xx) xx "_dma32", | |
440 | #else | |
441 | #define TEXT_FOR_DMA32(xx) | |
442 | #endif | |
443 | ||
444 | #ifdef CONFIG_HIGHMEM | |
445 | #define TEXT_FOR_HIGHMEM(xx) xx "_high", | |
446 | #else | |
447 | #define TEXT_FOR_HIGHMEM(xx) | |
448 | #endif | |
449 | ||
450 | #define TEXTS_FOR_ZONES(xx) xx "_dma", TEXT_FOR_DMA32(xx) xx "_normal", \ | |
451 | TEXT_FOR_HIGHMEM(xx) | |
452 | ||
f6ac2354 | 453 | static char *vmstat_text[] = { |
2244b95a | 454 | /* Zoned VM counters */ |
f3dbd344 | 455 | "nr_anon_pages", |
65ba55f5 | 456 | "nr_mapped", |
347ce434 | 457 | "nr_file_pages", |
9a865ffa | 458 | "nr_slab", |
df849a15 | 459 | "nr_page_table_pages", |
b1e7a8fd | 460 | "nr_dirty", |
ce866b34 | 461 | "nr_writeback", |
f6ac2354 | 462 | "nr_unstable", |
d2c5e30c | 463 | "nr_bounce", |
f6ac2354 | 464 | |
ca889e6c CL |
465 | #ifdef CONFIG_NUMA |
466 | "numa_hit", | |
467 | "numa_miss", | |
468 | "numa_foreign", | |
469 | "numa_interleave", | |
470 | "numa_local", | |
471 | "numa_other", | |
472 | #endif | |
473 | ||
f8891e5e | 474 | #ifdef CONFIG_VM_EVENT_COUNTERS |
f6ac2354 CL |
475 | "pgpgin", |
476 | "pgpgout", | |
477 | "pswpin", | |
478 | "pswpout", | |
479 | ||
27bf71c2 | 480 | TEXTS_FOR_ZONES("pgalloc") |
f6ac2354 CL |
481 | |
482 | "pgfree", | |
483 | "pgactivate", | |
484 | "pgdeactivate", | |
485 | ||
486 | "pgfault", | |
487 | "pgmajfault", | |
488 | ||
27bf71c2 CL |
489 | TEXTS_FOR_ZONES("pgrefill") |
490 | TEXTS_FOR_ZONES("pgsteal") | |
491 | TEXTS_FOR_ZONES("pgscan_kswapd") | |
492 | TEXTS_FOR_ZONES("pgscan_direct") | |
f6ac2354 CL |
493 | |
494 | "pginodesteal", | |
495 | "slabs_scanned", | |
496 | "kswapd_steal", | |
497 | "kswapd_inodesteal", | |
498 | "pageoutrun", | |
499 | "allocstall", | |
500 | ||
501 | "pgrotated", | |
f8891e5e | 502 | #endif |
f6ac2354 CL |
503 | }; |
504 | ||
505 | /* | |
506 | * Output information about zones in @pgdat. | |
507 | */ | |
508 | static int zoneinfo_show(struct seq_file *m, void *arg) | |
509 | { | |
510 | pg_data_t *pgdat = arg; | |
511 | struct zone *zone; | |
512 | struct zone *node_zones = pgdat->node_zones; | |
513 | unsigned long flags; | |
514 | ||
515 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; zone++) { | |
516 | int i; | |
517 | ||
518 | if (!populated_zone(zone)) | |
519 | continue; | |
520 | ||
521 | spin_lock_irqsave(&zone->lock, flags); | |
522 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); | |
523 | seq_printf(m, | |
524 | "\n pages free %lu" | |
525 | "\n min %lu" | |
526 | "\n low %lu" | |
527 | "\n high %lu" | |
528 | "\n active %lu" | |
529 | "\n inactive %lu" | |
530 | "\n scanned %lu (a: %lu i: %lu)" | |
531 | "\n spanned %lu" | |
532 | "\n present %lu", | |
533 | zone->free_pages, | |
534 | zone->pages_min, | |
535 | zone->pages_low, | |
536 | zone->pages_high, | |
537 | zone->nr_active, | |
538 | zone->nr_inactive, | |
539 | zone->pages_scanned, | |
540 | zone->nr_scan_active, zone->nr_scan_inactive, | |
541 | zone->spanned_pages, | |
542 | zone->present_pages); | |
2244b95a CL |
543 | |
544 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
545 | seq_printf(m, "\n %-12s %lu", vmstat_text[i], | |
546 | zone_page_state(zone, i)); | |
547 | ||
f6ac2354 CL |
548 | seq_printf(m, |
549 | "\n protection: (%lu", | |
550 | zone->lowmem_reserve[0]); | |
551 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) | |
552 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); | |
553 | seq_printf(m, | |
554 | ")" | |
555 | "\n pagesets"); | |
556 | for_each_online_cpu(i) { | |
557 | struct per_cpu_pageset *pageset; | |
558 | int j; | |
559 | ||
560 | pageset = zone_pcp(zone, i); | |
561 | for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) { | |
562 | if (pageset->pcp[j].count) | |
563 | break; | |
564 | } | |
565 | if (j == ARRAY_SIZE(pageset->pcp)) | |
566 | continue; | |
567 | for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) { | |
568 | seq_printf(m, | |
569 | "\n cpu: %i pcp: %i" | |
570 | "\n count: %i" | |
571 | "\n high: %i" | |
572 | "\n batch: %i", | |
573 | i, j, | |
574 | pageset->pcp[j].count, | |
575 | pageset->pcp[j].high, | |
576 | pageset->pcp[j].batch); | |
577 | } | |
df9ecaba CL |
578 | #ifdef CONFIG_SMP |
579 | seq_printf(m, "\n vm stats threshold: %d", | |
580 | pageset->stat_threshold); | |
581 | #endif | |
f6ac2354 CL |
582 | } |
583 | seq_printf(m, | |
584 | "\n all_unreclaimable: %u" | |
585 | "\n prev_priority: %i" | |
586 | "\n temp_priority: %i" | |
587 | "\n start_pfn: %lu", | |
588 | zone->all_unreclaimable, | |
589 | zone->prev_priority, | |
590 | zone->temp_priority, | |
591 | zone->zone_start_pfn); | |
592 | spin_unlock_irqrestore(&zone->lock, flags); | |
593 | seq_putc(m, '\n'); | |
594 | } | |
595 | return 0; | |
596 | } | |
597 | ||
598 | struct seq_operations zoneinfo_op = { | |
599 | .start = frag_start, /* iterate over all zones. The same as in | |
600 | * fragmentation. */ | |
601 | .next = frag_next, | |
602 | .stop = frag_stop, | |
603 | .show = zoneinfo_show, | |
604 | }; | |
605 | ||
606 | static void *vmstat_start(struct seq_file *m, loff_t *pos) | |
607 | { | |
2244b95a | 608 | unsigned long *v; |
f8891e5e CL |
609 | #ifdef CONFIG_VM_EVENT_COUNTERS |
610 | unsigned long *e; | |
611 | #endif | |
2244b95a | 612 | int i; |
f6ac2354 CL |
613 | |
614 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
615 | return NULL; | |
616 | ||
f8891e5e | 617 | #ifdef CONFIG_VM_EVENT_COUNTERS |
2244b95a | 618 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) |
f8891e5e CL |
619 | + sizeof(struct vm_event_state), GFP_KERNEL); |
620 | #else | |
621 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long), | |
622 | GFP_KERNEL); | |
623 | #endif | |
2244b95a CL |
624 | m->private = v; |
625 | if (!v) | |
f6ac2354 | 626 | return ERR_PTR(-ENOMEM); |
2244b95a CL |
627 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
628 | v[i] = global_page_state(i); | |
f8891e5e CL |
629 | #ifdef CONFIG_VM_EVENT_COUNTERS |
630 | e = v + NR_VM_ZONE_STAT_ITEMS; | |
631 | all_vm_events(e); | |
632 | e[PGPGIN] /= 2; /* sectors -> kbytes */ | |
633 | e[PGPGOUT] /= 2; | |
634 | #endif | |
2244b95a | 635 | return v + *pos; |
f6ac2354 CL |
636 | } |
637 | ||
638 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) | |
639 | { | |
640 | (*pos)++; | |
641 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
642 | return NULL; | |
643 | return (unsigned long *)m->private + *pos; | |
644 | } | |
645 | ||
646 | static int vmstat_show(struct seq_file *m, void *arg) | |
647 | { | |
648 | unsigned long *l = arg; | |
649 | unsigned long off = l - (unsigned long *)m->private; | |
650 | ||
651 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); | |
652 | return 0; | |
653 | } | |
654 | ||
655 | static void vmstat_stop(struct seq_file *m, void *arg) | |
656 | { | |
657 | kfree(m->private); | |
658 | m->private = NULL; | |
659 | } | |
660 | ||
661 | struct seq_operations vmstat_op = { | |
662 | .start = vmstat_start, | |
663 | .next = vmstat_next, | |
664 | .stop = vmstat_stop, | |
665 | .show = vmstat_show, | |
666 | }; | |
667 | ||
668 | #endif /* CONFIG_PROC_FS */ | |
669 | ||
df9ecaba CL |
670 | #ifdef CONFIG_SMP |
671 | /* | |
672 | * Use the cpu notifier to insure that the thresholds are recalculated | |
673 | * when necessary. | |
674 | */ | |
675 | static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb, | |
676 | unsigned long action, | |
677 | void *hcpu) | |
678 | { | |
679 | switch (action) { | |
680 | case CPU_UP_PREPARE: | |
681 | case CPU_UP_CANCELED: | |
682 | case CPU_DEAD: | |
683 | refresh_zone_stat_thresholds(); | |
684 | break; | |
685 | default: | |
686 | break; | |
687 | } | |
688 | return NOTIFY_OK; | |
689 | } | |
690 | ||
691 | static struct notifier_block __cpuinitdata vmstat_notifier = | |
692 | { &vmstat_cpuup_callback, NULL, 0 }; | |
693 | ||
694 | int __init setup_vmstat(void) | |
695 | { | |
696 | refresh_zone_stat_thresholds(); | |
697 | register_cpu_notifier(&vmstat_notifier); | |
698 | return 0; | |
699 | } | |
700 | module_init(setup_vmstat) | |
701 | #endif |