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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> |
f6ac2354 | 15 | |
f6ac2354 CL |
16 | void __get_zone_counts(unsigned long *active, unsigned long *inactive, |
17 | unsigned long *free, struct pglist_data *pgdat) | |
18 | { | |
19 | struct zone *zones = pgdat->node_zones; | |
20 | int i; | |
21 | ||
22 | *active = 0; | |
23 | *inactive = 0; | |
24 | *free = 0; | |
25 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
26 | *active += zones[i].nr_active; | |
27 | *inactive += zones[i].nr_inactive; | |
28 | *free += zones[i].free_pages; | |
29 | } | |
30 | } | |
31 | ||
32 | void get_zone_counts(unsigned long *active, | |
33 | unsigned long *inactive, unsigned long *free) | |
34 | { | |
35 | struct pglist_data *pgdat; | |
36 | ||
37 | *active = 0; | |
38 | *inactive = 0; | |
39 | *free = 0; | |
40 | for_each_online_pgdat(pgdat) { | |
41 | unsigned long l, m, n; | |
42 | __get_zone_counts(&l, &m, &n, pgdat); | |
43 | *active += l; | |
44 | *inactive += m; | |
45 | *free += n; | |
46 | } | |
47 | } | |
48 | ||
f8891e5e CL |
49 | #ifdef CONFIG_VM_EVENT_COUNTERS |
50 | DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}}; | |
51 | EXPORT_PER_CPU_SYMBOL(vm_event_states); | |
52 | ||
53 | static void sum_vm_events(unsigned long *ret, cpumask_t *cpumask) | |
54 | { | |
55 | int cpu = 0; | |
56 | int i; | |
57 | ||
58 | memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long)); | |
59 | ||
60 | cpu = first_cpu(*cpumask); | |
61 | while (cpu < NR_CPUS) { | |
62 | struct vm_event_state *this = &per_cpu(vm_event_states, cpu); | |
63 | ||
64 | cpu = next_cpu(cpu, *cpumask); | |
65 | ||
66 | if (cpu < NR_CPUS) | |
67 | prefetch(&per_cpu(vm_event_states, cpu)); | |
68 | ||
69 | ||
70 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) | |
71 | ret[i] += this->event[i]; | |
72 | } | |
73 | } | |
74 | ||
75 | /* | |
76 | * Accumulate the vm event counters across all CPUs. | |
77 | * The result is unavoidably approximate - it can change | |
78 | * during and after execution of this function. | |
79 | */ | |
80 | void all_vm_events(unsigned long *ret) | |
81 | { | |
82 | sum_vm_events(ret, &cpu_online_map); | |
83 | } | |
32dd66fc | 84 | EXPORT_SYMBOL_GPL(all_vm_events); |
f8891e5e CL |
85 | |
86 | #ifdef CONFIG_HOTPLUG | |
87 | /* | |
88 | * Fold the foreign cpu events into our own. | |
89 | * | |
90 | * This is adding to the events on one processor | |
91 | * but keeps the global counts constant. | |
92 | */ | |
93 | void vm_events_fold_cpu(int cpu) | |
94 | { | |
95 | struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu); | |
96 | int i; | |
97 | ||
98 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) { | |
99 | count_vm_events(i, fold_state->event[i]); | |
100 | fold_state->event[i] = 0; | |
101 | } | |
102 | } | |
103 | #endif /* CONFIG_HOTPLUG */ | |
104 | ||
105 | #endif /* CONFIG_VM_EVENT_COUNTERS */ | |
106 | ||
2244b95a CL |
107 | /* |
108 | * Manage combined zone based / global counters | |
109 | * | |
110 | * vm_stat contains the global counters | |
111 | */ | |
112 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
113 | EXPORT_SYMBOL(vm_stat); | |
114 | ||
115 | #ifdef CONFIG_SMP | |
116 | ||
117 | #define STAT_THRESHOLD 32 | |
118 | ||
119 | /* | |
120 | * Determine pointer to currently valid differential byte given a zone and | |
121 | * the item number. | |
122 | * | |
123 | * Preemption must be off | |
124 | */ | |
125 | static inline s8 *diff_pointer(struct zone *zone, enum zone_stat_item item) | |
126 | { | |
127 | return &zone_pcp(zone, smp_processor_id())->vm_stat_diff[item]; | |
128 | } | |
129 | ||
130 | /* | |
131 | * For use when we know that interrupts are disabled. | |
132 | */ | |
133 | void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
134 | int delta) | |
135 | { | |
136 | s8 *p; | |
137 | long x; | |
138 | ||
139 | p = diff_pointer(zone, item); | |
140 | x = delta + *p; | |
141 | ||
142 | if (unlikely(x > STAT_THRESHOLD || x < -STAT_THRESHOLD)) { | |
143 | zone_page_state_add(x, zone, item); | |
144 | x = 0; | |
145 | } | |
146 | ||
147 | *p = x; | |
148 | } | |
149 | EXPORT_SYMBOL(__mod_zone_page_state); | |
150 | ||
151 | /* | |
152 | * For an unknown interrupt state | |
153 | */ | |
154 | void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
155 | int delta) | |
156 | { | |
157 | unsigned long flags; | |
158 | ||
159 | local_irq_save(flags); | |
160 | __mod_zone_page_state(zone, item, delta); | |
161 | local_irq_restore(flags); | |
162 | } | |
163 | EXPORT_SYMBOL(mod_zone_page_state); | |
164 | ||
165 | /* | |
166 | * Optimized increment and decrement functions. | |
167 | * | |
168 | * These are only for a single page and therefore can take a struct page * | |
169 | * argument instead of struct zone *. This allows the inclusion of the code | |
170 | * generated for page_zone(page) into the optimized functions. | |
171 | * | |
172 | * No overflow check is necessary and therefore the differential can be | |
173 | * incremented or decremented in place which may allow the compilers to | |
174 | * generate better code. | |
175 | * | |
176 | * The increment or decrement is known and therefore one boundary check can | |
177 | * be omitted. | |
178 | * | |
179 | * Some processors have inc/dec instructions that are atomic vs an interrupt. | |
180 | * However, the code must first determine the differential location in a zone | |
181 | * based on the processor number and then inc/dec the counter. There is no | |
182 | * guarantee without disabling preemption that the processor will not change | |
183 | * in between and therefore the atomicity vs. interrupt cannot be exploited | |
184 | * in a useful way here. | |
185 | */ | |
ca889e6c | 186 | static void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 187 | { |
2244b95a CL |
188 | s8 *p = diff_pointer(zone, item); |
189 | ||
190 | (*p)++; | |
191 | ||
192 | if (unlikely(*p > STAT_THRESHOLD)) { | |
a302eb4e CL |
193 | zone_page_state_add(*p + STAT_THRESHOLD / 2, zone, item); |
194 | *p = -STAT_THRESHOLD / 2; | |
2244b95a CL |
195 | } |
196 | } | |
ca889e6c CL |
197 | |
198 | void __inc_zone_page_state(struct page *page, enum zone_stat_item item) | |
199 | { | |
200 | __inc_zone_state(page_zone(page), item); | |
201 | } | |
2244b95a CL |
202 | EXPORT_SYMBOL(__inc_zone_page_state); |
203 | ||
204 | void __dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
205 | { | |
206 | struct zone *zone = page_zone(page); | |
207 | s8 *p = diff_pointer(zone, item); | |
208 | ||
209 | (*p)--; | |
210 | ||
211 | if (unlikely(*p < -STAT_THRESHOLD)) { | |
a302eb4e CL |
212 | zone_page_state_add(*p - STAT_THRESHOLD / 2, zone, item); |
213 | *p = STAT_THRESHOLD /2; | |
2244b95a CL |
214 | } |
215 | } | |
216 | EXPORT_SYMBOL(__dec_zone_page_state); | |
217 | ||
ca889e6c CL |
218 | void inc_zone_state(struct zone *zone, enum zone_stat_item item) |
219 | { | |
220 | unsigned long flags; | |
221 | ||
222 | local_irq_save(flags); | |
223 | __inc_zone_state(zone, item); | |
224 | local_irq_restore(flags); | |
225 | } | |
226 | ||
2244b95a CL |
227 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
228 | { | |
229 | unsigned long flags; | |
230 | struct zone *zone; | |
2244b95a CL |
231 | |
232 | zone = page_zone(page); | |
233 | local_irq_save(flags); | |
ca889e6c | 234 | __inc_zone_state(zone, item); |
2244b95a CL |
235 | local_irq_restore(flags); |
236 | } | |
237 | EXPORT_SYMBOL(inc_zone_page_state); | |
238 | ||
239 | void dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
240 | { | |
241 | unsigned long flags; | |
2244b95a | 242 | |
2244b95a | 243 | local_irq_save(flags); |
a302eb4e | 244 | __dec_zone_page_state(page, item); |
2244b95a CL |
245 | local_irq_restore(flags); |
246 | } | |
247 | EXPORT_SYMBOL(dec_zone_page_state); | |
248 | ||
249 | /* | |
250 | * Update the zone counters for one cpu. | |
251 | */ | |
252 | void refresh_cpu_vm_stats(int cpu) | |
253 | { | |
254 | struct zone *zone; | |
255 | int i; | |
256 | unsigned long flags; | |
257 | ||
258 | for_each_zone(zone) { | |
259 | struct per_cpu_pageset *pcp; | |
260 | ||
261 | pcp = zone_pcp(zone, cpu); | |
262 | ||
263 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
264 | if (pcp->vm_stat_diff[i]) { | |
265 | local_irq_save(flags); | |
266 | zone_page_state_add(pcp->vm_stat_diff[i], | |
267 | zone, i); | |
268 | pcp->vm_stat_diff[i] = 0; | |
269 | local_irq_restore(flags); | |
270 | } | |
271 | } | |
272 | } | |
273 | ||
274 | static void __refresh_cpu_vm_stats(void *dummy) | |
275 | { | |
276 | refresh_cpu_vm_stats(smp_processor_id()); | |
277 | } | |
278 | ||
279 | /* | |
280 | * Consolidate all counters. | |
281 | * | |
282 | * Note that the result is less inaccurate but still inaccurate | |
283 | * if concurrent processes are allowed to run. | |
284 | */ | |
285 | void refresh_vm_stats(void) | |
286 | { | |
287 | on_each_cpu(__refresh_cpu_vm_stats, NULL, 0, 1); | |
288 | } | |
289 | EXPORT_SYMBOL(refresh_vm_stats); | |
290 | ||
291 | #endif | |
292 | ||
ca889e6c CL |
293 | #ifdef CONFIG_NUMA |
294 | /* | |
295 | * zonelist = the list of zones passed to the allocator | |
296 | * z = the zone from which the allocation occurred. | |
297 | * | |
298 | * Must be called with interrupts disabled. | |
299 | */ | |
300 | void zone_statistics(struct zonelist *zonelist, struct zone *z) | |
301 | { | |
302 | if (z->zone_pgdat == zonelist->zones[0]->zone_pgdat) { | |
303 | __inc_zone_state(z, NUMA_HIT); | |
304 | } else { | |
305 | __inc_zone_state(z, NUMA_MISS); | |
306 | __inc_zone_state(zonelist->zones[0], NUMA_FOREIGN); | |
307 | } | |
308 | if (z->zone_pgdat == NODE_DATA(numa_node_id())) | |
309 | __inc_zone_state(z, NUMA_LOCAL); | |
310 | else | |
311 | __inc_zone_state(z, NUMA_OTHER); | |
312 | } | |
313 | #endif | |
314 | ||
f6ac2354 CL |
315 | #ifdef CONFIG_PROC_FS |
316 | ||
317 | #include <linux/seq_file.h> | |
318 | ||
319 | static void *frag_start(struct seq_file *m, loff_t *pos) | |
320 | { | |
321 | pg_data_t *pgdat; | |
322 | loff_t node = *pos; | |
323 | for (pgdat = first_online_pgdat(); | |
324 | pgdat && node; | |
325 | pgdat = next_online_pgdat(pgdat)) | |
326 | --node; | |
327 | ||
328 | return pgdat; | |
329 | } | |
330 | ||
331 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) | |
332 | { | |
333 | pg_data_t *pgdat = (pg_data_t *)arg; | |
334 | ||
335 | (*pos)++; | |
336 | return next_online_pgdat(pgdat); | |
337 | } | |
338 | ||
339 | static void frag_stop(struct seq_file *m, void *arg) | |
340 | { | |
341 | } | |
342 | ||
343 | /* | |
344 | * This walks the free areas for each zone. | |
345 | */ | |
346 | static int frag_show(struct seq_file *m, void *arg) | |
347 | { | |
348 | pg_data_t *pgdat = (pg_data_t *)arg; | |
349 | struct zone *zone; | |
350 | struct zone *node_zones = pgdat->node_zones; | |
351 | unsigned long flags; | |
352 | int order; | |
353 | ||
354 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { | |
355 | if (!populated_zone(zone)) | |
356 | continue; | |
357 | ||
358 | spin_lock_irqsave(&zone->lock, flags); | |
359 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
360 | for (order = 0; order < MAX_ORDER; ++order) | |
361 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); | |
362 | spin_unlock_irqrestore(&zone->lock, flags); | |
363 | seq_putc(m, '\n'); | |
364 | } | |
365 | return 0; | |
366 | } | |
367 | ||
368 | struct seq_operations fragmentation_op = { | |
369 | .start = frag_start, | |
370 | .next = frag_next, | |
371 | .stop = frag_stop, | |
372 | .show = frag_show, | |
373 | }; | |
374 | ||
375 | static char *vmstat_text[] = { | |
2244b95a | 376 | /* Zoned VM counters */ |
f3dbd344 | 377 | "nr_anon_pages", |
65ba55f5 | 378 | "nr_mapped", |
347ce434 | 379 | "nr_file_pages", |
9a865ffa | 380 | "nr_slab", |
df849a15 | 381 | "nr_page_table_pages", |
b1e7a8fd | 382 | "nr_dirty", |
ce866b34 | 383 | "nr_writeback", |
f6ac2354 | 384 | "nr_unstable", |
d2c5e30c | 385 | "nr_bounce", |
f6ac2354 | 386 | |
ca889e6c CL |
387 | #ifdef CONFIG_NUMA |
388 | "numa_hit", | |
389 | "numa_miss", | |
390 | "numa_foreign", | |
391 | "numa_interleave", | |
392 | "numa_local", | |
393 | "numa_other", | |
394 | #endif | |
395 | ||
f8891e5e | 396 | #ifdef CONFIG_VM_EVENT_COUNTERS |
f6ac2354 CL |
397 | "pgpgin", |
398 | "pgpgout", | |
399 | "pswpin", | |
400 | "pswpout", | |
401 | ||
f6ac2354 | 402 | "pgalloc_dma", |
f8891e5e CL |
403 | "pgalloc_dma32", |
404 | "pgalloc_normal", | |
405 | "pgalloc_high", | |
f6ac2354 CL |
406 | |
407 | "pgfree", | |
408 | "pgactivate", | |
409 | "pgdeactivate", | |
410 | ||
411 | "pgfault", | |
412 | "pgmajfault", | |
413 | ||
f6ac2354 | 414 | "pgrefill_dma", |
f8891e5e CL |
415 | "pgrefill_dma32", |
416 | "pgrefill_normal", | |
417 | "pgrefill_high", | |
f6ac2354 | 418 | |
f6ac2354 | 419 | "pgsteal_dma", |
f8891e5e CL |
420 | "pgsteal_dma32", |
421 | "pgsteal_normal", | |
422 | "pgsteal_high", | |
f6ac2354 | 423 | |
f6ac2354 | 424 | "pgscan_kswapd_dma", |
f8891e5e CL |
425 | "pgscan_kswapd_dma32", |
426 | "pgscan_kswapd_normal", | |
427 | "pgscan_kswapd_high", | |
f6ac2354 | 428 | |
f6ac2354 | 429 | "pgscan_direct_dma", |
f8891e5e CL |
430 | "pgscan_direct_dma32", |
431 | "pgscan_direct_normal", | |
432 | "pgscan_direct_high", | |
f6ac2354 CL |
433 | |
434 | "pginodesteal", | |
435 | "slabs_scanned", | |
436 | "kswapd_steal", | |
437 | "kswapd_inodesteal", | |
438 | "pageoutrun", | |
439 | "allocstall", | |
440 | ||
441 | "pgrotated", | |
f8891e5e | 442 | #endif |
f6ac2354 CL |
443 | }; |
444 | ||
445 | /* | |
446 | * Output information about zones in @pgdat. | |
447 | */ | |
448 | static int zoneinfo_show(struct seq_file *m, void *arg) | |
449 | { | |
450 | pg_data_t *pgdat = arg; | |
451 | struct zone *zone; | |
452 | struct zone *node_zones = pgdat->node_zones; | |
453 | unsigned long flags; | |
454 | ||
455 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; zone++) { | |
456 | int i; | |
457 | ||
458 | if (!populated_zone(zone)) | |
459 | continue; | |
460 | ||
461 | spin_lock_irqsave(&zone->lock, flags); | |
462 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); | |
463 | seq_printf(m, | |
464 | "\n pages free %lu" | |
465 | "\n min %lu" | |
466 | "\n low %lu" | |
467 | "\n high %lu" | |
468 | "\n active %lu" | |
469 | "\n inactive %lu" | |
470 | "\n scanned %lu (a: %lu i: %lu)" | |
471 | "\n spanned %lu" | |
472 | "\n present %lu", | |
473 | zone->free_pages, | |
474 | zone->pages_min, | |
475 | zone->pages_low, | |
476 | zone->pages_high, | |
477 | zone->nr_active, | |
478 | zone->nr_inactive, | |
479 | zone->pages_scanned, | |
480 | zone->nr_scan_active, zone->nr_scan_inactive, | |
481 | zone->spanned_pages, | |
482 | zone->present_pages); | |
2244b95a CL |
483 | |
484 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
485 | seq_printf(m, "\n %-12s %lu", vmstat_text[i], | |
486 | zone_page_state(zone, i)); | |
487 | ||
f6ac2354 CL |
488 | seq_printf(m, |
489 | "\n protection: (%lu", | |
490 | zone->lowmem_reserve[0]); | |
491 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) | |
492 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); | |
493 | seq_printf(m, | |
494 | ")" | |
495 | "\n pagesets"); | |
496 | for_each_online_cpu(i) { | |
497 | struct per_cpu_pageset *pageset; | |
498 | int j; | |
499 | ||
500 | pageset = zone_pcp(zone, i); | |
501 | for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) { | |
502 | if (pageset->pcp[j].count) | |
503 | break; | |
504 | } | |
505 | if (j == ARRAY_SIZE(pageset->pcp)) | |
506 | continue; | |
507 | for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) { | |
508 | seq_printf(m, | |
509 | "\n cpu: %i pcp: %i" | |
510 | "\n count: %i" | |
511 | "\n high: %i" | |
512 | "\n batch: %i", | |
513 | i, j, | |
514 | pageset->pcp[j].count, | |
515 | pageset->pcp[j].high, | |
516 | pageset->pcp[j].batch); | |
517 | } | |
f6ac2354 CL |
518 | } |
519 | seq_printf(m, | |
520 | "\n all_unreclaimable: %u" | |
521 | "\n prev_priority: %i" | |
522 | "\n temp_priority: %i" | |
523 | "\n start_pfn: %lu", | |
524 | zone->all_unreclaimable, | |
525 | zone->prev_priority, | |
526 | zone->temp_priority, | |
527 | zone->zone_start_pfn); | |
528 | spin_unlock_irqrestore(&zone->lock, flags); | |
529 | seq_putc(m, '\n'); | |
530 | } | |
531 | return 0; | |
532 | } | |
533 | ||
534 | struct seq_operations zoneinfo_op = { | |
535 | .start = frag_start, /* iterate over all zones. The same as in | |
536 | * fragmentation. */ | |
537 | .next = frag_next, | |
538 | .stop = frag_stop, | |
539 | .show = zoneinfo_show, | |
540 | }; | |
541 | ||
542 | static void *vmstat_start(struct seq_file *m, loff_t *pos) | |
543 | { | |
2244b95a | 544 | unsigned long *v; |
f8891e5e CL |
545 | #ifdef CONFIG_VM_EVENT_COUNTERS |
546 | unsigned long *e; | |
547 | #endif | |
2244b95a | 548 | int i; |
f6ac2354 CL |
549 | |
550 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
551 | return NULL; | |
552 | ||
f8891e5e | 553 | #ifdef CONFIG_VM_EVENT_COUNTERS |
2244b95a | 554 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) |
f8891e5e CL |
555 | + sizeof(struct vm_event_state), GFP_KERNEL); |
556 | #else | |
557 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long), | |
558 | GFP_KERNEL); | |
559 | #endif | |
2244b95a CL |
560 | m->private = v; |
561 | if (!v) | |
f6ac2354 | 562 | return ERR_PTR(-ENOMEM); |
2244b95a CL |
563 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
564 | v[i] = global_page_state(i); | |
f8891e5e CL |
565 | #ifdef CONFIG_VM_EVENT_COUNTERS |
566 | e = v + NR_VM_ZONE_STAT_ITEMS; | |
567 | all_vm_events(e); | |
568 | e[PGPGIN] /= 2; /* sectors -> kbytes */ | |
569 | e[PGPGOUT] /= 2; | |
570 | #endif | |
2244b95a | 571 | return v + *pos; |
f6ac2354 CL |
572 | } |
573 | ||
574 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) | |
575 | { | |
576 | (*pos)++; | |
577 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
578 | return NULL; | |
579 | return (unsigned long *)m->private + *pos; | |
580 | } | |
581 | ||
582 | static int vmstat_show(struct seq_file *m, void *arg) | |
583 | { | |
584 | unsigned long *l = arg; | |
585 | unsigned long off = l - (unsigned long *)m->private; | |
586 | ||
587 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); | |
588 | return 0; | |
589 | } | |
590 | ||
591 | static void vmstat_stop(struct seq_file *m, void *arg) | |
592 | { | |
593 | kfree(m->private); | |
594 | m->private = NULL; | |
595 | } | |
596 | ||
597 | struct seq_operations vmstat_op = { | |
598 | .start = vmstat_start, | |
599 | .next = vmstat_next, | |
600 | .stop = vmstat_stop, | |
601 | .show = vmstat_show, | |
602 | }; | |
603 | ||
604 | #endif /* CONFIG_PROC_FS */ | |
605 |