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 | 10 | */ |
8f32f7e5 | 11 | #include <linux/fs.h> |
f6ac2354 | 12 | #include <linux/mm.h> |
4e950f6f | 13 | #include <linux/err.h> |
2244b95a | 14 | #include <linux/module.h> |
df9ecaba | 15 | #include <linux/cpu.h> |
c748e134 | 16 | #include <linux/vmstat.h> |
e8edc6e0 | 17 | #include <linux/sched.h> |
f6ac2354 | 18 | |
f8891e5e CL |
19 | #ifdef CONFIG_VM_EVENT_COUNTERS |
20 | DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}}; | |
21 | EXPORT_PER_CPU_SYMBOL(vm_event_states); | |
22 | ||
174596a0 | 23 | static void sum_vm_events(unsigned long *ret, const struct cpumask *cpumask) |
f8891e5e | 24 | { |
9eccf2a8 | 25 | int cpu; |
f8891e5e CL |
26 | int i; |
27 | ||
28 | memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long)); | |
29 | ||
aa85ea5b | 30 | for_each_cpu(cpu, cpumask) { |
f8891e5e CL |
31 | struct vm_event_state *this = &per_cpu(vm_event_states, cpu); |
32 | ||
f8891e5e CL |
33 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) |
34 | ret[i] += this->event[i]; | |
35 | } | |
36 | } | |
37 | ||
38 | /* | |
39 | * Accumulate the vm event counters across all CPUs. | |
40 | * The result is unavoidably approximate - it can change | |
41 | * during and after execution of this function. | |
42 | */ | |
43 | void all_vm_events(unsigned long *ret) | |
44 | { | |
b5be1132 | 45 | get_online_cpus(); |
174596a0 | 46 | sum_vm_events(ret, cpu_online_mask); |
b5be1132 | 47 | put_online_cpus(); |
f8891e5e | 48 | } |
32dd66fc | 49 | EXPORT_SYMBOL_GPL(all_vm_events); |
f8891e5e CL |
50 | |
51 | #ifdef CONFIG_HOTPLUG | |
52 | /* | |
53 | * Fold the foreign cpu events into our own. | |
54 | * | |
55 | * This is adding to the events on one processor | |
56 | * but keeps the global counts constant. | |
57 | */ | |
58 | void vm_events_fold_cpu(int cpu) | |
59 | { | |
60 | struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu); | |
61 | int i; | |
62 | ||
63 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) { | |
64 | count_vm_events(i, fold_state->event[i]); | |
65 | fold_state->event[i] = 0; | |
66 | } | |
67 | } | |
68 | #endif /* CONFIG_HOTPLUG */ | |
69 | ||
70 | #endif /* CONFIG_VM_EVENT_COUNTERS */ | |
71 | ||
2244b95a CL |
72 | /* |
73 | * Manage combined zone based / global counters | |
74 | * | |
75 | * vm_stat contains the global counters | |
76 | */ | |
77 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
78 | EXPORT_SYMBOL(vm_stat); | |
79 | ||
80 | #ifdef CONFIG_SMP | |
81 | ||
df9ecaba CL |
82 | static int calculate_threshold(struct zone *zone) |
83 | { | |
84 | int threshold; | |
85 | int mem; /* memory in 128 MB units */ | |
86 | ||
87 | /* | |
88 | * The threshold scales with the number of processors and the amount | |
89 | * of memory per zone. More memory means that we can defer updates for | |
90 | * longer, more processors could lead to more contention. | |
91 | * fls() is used to have a cheap way of logarithmic scaling. | |
92 | * | |
93 | * Some sample thresholds: | |
94 | * | |
95 | * Threshold Processors (fls) Zonesize fls(mem+1) | |
96 | * ------------------------------------------------------------------ | |
97 | * 8 1 1 0.9-1 GB 4 | |
98 | * 16 2 2 0.9-1 GB 4 | |
99 | * 20 2 2 1-2 GB 5 | |
100 | * 24 2 2 2-4 GB 6 | |
101 | * 28 2 2 4-8 GB 7 | |
102 | * 32 2 2 8-16 GB 8 | |
103 | * 4 2 2 <128M 1 | |
104 | * 30 4 3 2-4 GB 5 | |
105 | * 48 4 3 8-16 GB 8 | |
106 | * 32 8 4 1-2 GB 4 | |
107 | * 32 8 4 0.9-1GB 4 | |
108 | * 10 16 5 <128M 1 | |
109 | * 40 16 5 900M 4 | |
110 | * 70 64 7 2-4 GB 5 | |
111 | * 84 64 7 4-8 GB 6 | |
112 | * 108 512 9 4-8 GB 6 | |
113 | * 125 1024 10 8-16 GB 8 | |
114 | * 125 1024 10 16-32 GB 9 | |
115 | */ | |
116 | ||
117 | mem = zone->present_pages >> (27 - PAGE_SHIFT); | |
118 | ||
119 | threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem)); | |
120 | ||
121 | /* | |
122 | * Maximum threshold is 125 | |
123 | */ | |
124 | threshold = min(125, threshold); | |
125 | ||
126 | return threshold; | |
127 | } | |
2244b95a CL |
128 | |
129 | /* | |
df9ecaba | 130 | * Refresh the thresholds for each zone. |
2244b95a | 131 | */ |
df9ecaba | 132 | static void refresh_zone_stat_thresholds(void) |
2244b95a | 133 | { |
df9ecaba CL |
134 | struct zone *zone; |
135 | int cpu; | |
136 | int threshold; | |
137 | ||
ee99c71c | 138 | for_each_populated_zone(zone) { |
df9ecaba CL |
139 | threshold = calculate_threshold(zone); |
140 | ||
141 | for_each_online_cpu(cpu) | |
142 | zone_pcp(zone, cpu)->stat_threshold = threshold; | |
143 | } | |
2244b95a CL |
144 | } |
145 | ||
146 | /* | |
147 | * For use when we know that interrupts are disabled. | |
148 | */ | |
149 | void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
150 | int delta) | |
151 | { | |
df9ecaba CL |
152 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
153 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
154 | long x; |
155 | ||
2244b95a CL |
156 | x = delta + *p; |
157 | ||
df9ecaba | 158 | if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) { |
2244b95a CL |
159 | zone_page_state_add(x, zone, item); |
160 | x = 0; | |
161 | } | |
2244b95a CL |
162 | *p = x; |
163 | } | |
164 | EXPORT_SYMBOL(__mod_zone_page_state); | |
165 | ||
166 | /* | |
167 | * For an unknown interrupt state | |
168 | */ | |
169 | void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
170 | int delta) | |
171 | { | |
172 | unsigned long flags; | |
173 | ||
174 | local_irq_save(flags); | |
175 | __mod_zone_page_state(zone, item, delta); | |
176 | local_irq_restore(flags); | |
177 | } | |
178 | EXPORT_SYMBOL(mod_zone_page_state); | |
179 | ||
180 | /* | |
181 | * Optimized increment and decrement functions. | |
182 | * | |
183 | * These are only for a single page and therefore can take a struct page * | |
184 | * argument instead of struct zone *. This allows the inclusion of the code | |
185 | * generated for page_zone(page) into the optimized functions. | |
186 | * | |
187 | * No overflow check is necessary and therefore the differential can be | |
188 | * incremented or decremented in place which may allow the compilers to | |
189 | * generate better code. | |
2244b95a CL |
190 | * The increment or decrement is known and therefore one boundary check can |
191 | * be omitted. | |
192 | * | |
df9ecaba CL |
193 | * NOTE: These functions are very performance sensitive. Change only |
194 | * with care. | |
195 | * | |
2244b95a CL |
196 | * Some processors have inc/dec instructions that are atomic vs an interrupt. |
197 | * However, the code must first determine the differential location in a zone | |
198 | * based on the processor number and then inc/dec the counter. There is no | |
199 | * guarantee without disabling preemption that the processor will not change | |
200 | * in between and therefore the atomicity vs. interrupt cannot be exploited | |
201 | * in a useful way here. | |
202 | */ | |
c8785385 | 203 | void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 204 | { |
df9ecaba CL |
205 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
206 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
207 | |
208 | (*p)++; | |
209 | ||
df9ecaba CL |
210 | if (unlikely(*p > pcp->stat_threshold)) { |
211 | int overstep = pcp->stat_threshold / 2; | |
212 | ||
213 | zone_page_state_add(*p + overstep, zone, item); | |
214 | *p = -overstep; | |
2244b95a CL |
215 | } |
216 | } | |
ca889e6c CL |
217 | |
218 | void __inc_zone_page_state(struct page *page, enum zone_stat_item item) | |
219 | { | |
220 | __inc_zone_state(page_zone(page), item); | |
221 | } | |
2244b95a CL |
222 | EXPORT_SYMBOL(__inc_zone_page_state); |
223 | ||
c8785385 | 224 | void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 225 | { |
df9ecaba CL |
226 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
227 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
228 | |
229 | (*p)--; | |
230 | ||
df9ecaba CL |
231 | if (unlikely(*p < - pcp->stat_threshold)) { |
232 | int overstep = pcp->stat_threshold / 2; | |
233 | ||
234 | zone_page_state_add(*p - overstep, zone, item); | |
235 | *p = overstep; | |
2244b95a CL |
236 | } |
237 | } | |
c8785385 CL |
238 | |
239 | void __dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
240 | { | |
241 | __dec_zone_state(page_zone(page), item); | |
242 | } | |
2244b95a CL |
243 | EXPORT_SYMBOL(__dec_zone_page_state); |
244 | ||
ca889e6c CL |
245 | void inc_zone_state(struct zone *zone, enum zone_stat_item item) |
246 | { | |
247 | unsigned long flags; | |
248 | ||
249 | local_irq_save(flags); | |
250 | __inc_zone_state(zone, item); | |
251 | local_irq_restore(flags); | |
252 | } | |
253 | ||
2244b95a CL |
254 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
255 | { | |
256 | unsigned long flags; | |
257 | struct zone *zone; | |
2244b95a CL |
258 | |
259 | zone = page_zone(page); | |
260 | local_irq_save(flags); | |
ca889e6c | 261 | __inc_zone_state(zone, item); |
2244b95a CL |
262 | local_irq_restore(flags); |
263 | } | |
264 | EXPORT_SYMBOL(inc_zone_page_state); | |
265 | ||
266 | void dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
267 | { | |
268 | unsigned long flags; | |
2244b95a | 269 | |
2244b95a | 270 | local_irq_save(flags); |
a302eb4e | 271 | __dec_zone_page_state(page, item); |
2244b95a CL |
272 | local_irq_restore(flags); |
273 | } | |
274 | EXPORT_SYMBOL(dec_zone_page_state); | |
275 | ||
276 | /* | |
277 | * Update the zone counters for one cpu. | |
4037d452 | 278 | * |
a7f75e25 CL |
279 | * The cpu specified must be either the current cpu or a processor that |
280 | * is not online. If it is the current cpu then the execution thread must | |
281 | * be pinned to the current cpu. | |
282 | * | |
4037d452 CL |
283 | * Note that refresh_cpu_vm_stats strives to only access |
284 | * node local memory. The per cpu pagesets on remote zones are placed | |
285 | * in the memory local to the processor using that pageset. So the | |
286 | * loop over all zones will access a series of cachelines local to | |
287 | * the processor. | |
288 | * | |
289 | * The call to zone_page_state_add updates the cachelines with the | |
290 | * statistics in the remote zone struct as well as the global cachelines | |
291 | * with the global counters. These could cause remote node cache line | |
292 | * bouncing and will have to be only done when necessary. | |
2244b95a CL |
293 | */ |
294 | void refresh_cpu_vm_stats(int cpu) | |
295 | { | |
296 | struct zone *zone; | |
297 | int i; | |
a7f75e25 | 298 | int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, }; |
2244b95a | 299 | |
ee99c71c | 300 | for_each_populated_zone(zone) { |
4037d452 | 301 | struct per_cpu_pageset *p; |
2244b95a | 302 | |
4037d452 | 303 | p = zone_pcp(zone, cpu); |
2244b95a CL |
304 | |
305 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
4037d452 | 306 | if (p->vm_stat_diff[i]) { |
a7f75e25 CL |
307 | unsigned long flags; |
308 | int v; | |
309 | ||
2244b95a | 310 | local_irq_save(flags); |
a7f75e25 | 311 | v = p->vm_stat_diff[i]; |
4037d452 | 312 | p->vm_stat_diff[i] = 0; |
a7f75e25 CL |
313 | local_irq_restore(flags); |
314 | atomic_long_add(v, &zone->vm_stat[i]); | |
315 | global_diff[i] += v; | |
4037d452 CL |
316 | #ifdef CONFIG_NUMA |
317 | /* 3 seconds idle till flush */ | |
318 | p->expire = 3; | |
319 | #endif | |
2244b95a | 320 | } |
468fd62e | 321 | cond_resched(); |
4037d452 CL |
322 | #ifdef CONFIG_NUMA |
323 | /* | |
324 | * Deal with draining the remote pageset of this | |
325 | * processor | |
326 | * | |
327 | * Check if there are pages remaining in this pageset | |
328 | * if not then there is nothing to expire. | |
329 | */ | |
3dfa5721 | 330 | if (!p->expire || !p->pcp.count) |
4037d452 CL |
331 | continue; |
332 | ||
333 | /* | |
334 | * We never drain zones local to this processor. | |
335 | */ | |
336 | if (zone_to_nid(zone) == numa_node_id()) { | |
337 | p->expire = 0; | |
338 | continue; | |
339 | } | |
340 | ||
341 | p->expire--; | |
342 | if (p->expire) | |
343 | continue; | |
344 | ||
3dfa5721 CL |
345 | if (p->pcp.count) |
346 | drain_zone_pages(zone, &p->pcp); | |
4037d452 | 347 | #endif |
2244b95a | 348 | } |
a7f75e25 CL |
349 | |
350 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
351 | if (global_diff[i]) | |
352 | atomic_long_add(global_diff[i], &vm_stat[i]); | |
2244b95a CL |
353 | } |
354 | ||
2244b95a CL |
355 | #endif |
356 | ||
ca889e6c CL |
357 | #ifdef CONFIG_NUMA |
358 | /* | |
359 | * zonelist = the list of zones passed to the allocator | |
360 | * z = the zone from which the allocation occurred. | |
361 | * | |
362 | * Must be called with interrupts disabled. | |
363 | */ | |
18ea7e71 | 364 | void zone_statistics(struct zone *preferred_zone, struct zone *z) |
ca889e6c | 365 | { |
18ea7e71 | 366 | if (z->zone_pgdat == preferred_zone->zone_pgdat) { |
ca889e6c CL |
367 | __inc_zone_state(z, NUMA_HIT); |
368 | } else { | |
369 | __inc_zone_state(z, NUMA_MISS); | |
18ea7e71 | 370 | __inc_zone_state(preferred_zone, NUMA_FOREIGN); |
ca889e6c | 371 | } |
5d292343 | 372 | if (z->node == numa_node_id()) |
ca889e6c CL |
373 | __inc_zone_state(z, NUMA_LOCAL); |
374 | else | |
375 | __inc_zone_state(z, NUMA_OTHER); | |
376 | } | |
377 | #endif | |
378 | ||
f6ac2354 | 379 | #ifdef CONFIG_PROC_FS |
8f32f7e5 | 380 | #include <linux/proc_fs.h> |
f6ac2354 CL |
381 | #include <linux/seq_file.h> |
382 | ||
467c996c MG |
383 | static char * const migratetype_names[MIGRATE_TYPES] = { |
384 | "Unmovable", | |
385 | "Reclaimable", | |
386 | "Movable", | |
387 | "Reserve", | |
91446b06 | 388 | "Isolate", |
467c996c MG |
389 | }; |
390 | ||
f6ac2354 CL |
391 | static void *frag_start(struct seq_file *m, loff_t *pos) |
392 | { | |
393 | pg_data_t *pgdat; | |
394 | loff_t node = *pos; | |
395 | for (pgdat = first_online_pgdat(); | |
396 | pgdat && node; | |
397 | pgdat = next_online_pgdat(pgdat)) | |
398 | --node; | |
399 | ||
400 | return pgdat; | |
401 | } | |
402 | ||
403 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) | |
404 | { | |
405 | pg_data_t *pgdat = (pg_data_t *)arg; | |
406 | ||
407 | (*pos)++; | |
408 | return next_online_pgdat(pgdat); | |
409 | } | |
410 | ||
411 | static void frag_stop(struct seq_file *m, void *arg) | |
412 | { | |
413 | } | |
414 | ||
467c996c MG |
415 | /* Walk all the zones in a node and print using a callback */ |
416 | static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat, | |
417 | void (*print)(struct seq_file *m, pg_data_t *, struct zone *)) | |
f6ac2354 | 418 | { |
f6ac2354 CL |
419 | struct zone *zone; |
420 | struct zone *node_zones = pgdat->node_zones; | |
421 | unsigned long flags; | |
f6ac2354 CL |
422 | |
423 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { | |
424 | if (!populated_zone(zone)) | |
425 | continue; | |
426 | ||
427 | spin_lock_irqsave(&zone->lock, flags); | |
467c996c | 428 | print(m, pgdat, zone); |
f6ac2354 | 429 | spin_unlock_irqrestore(&zone->lock, flags); |
467c996c MG |
430 | } |
431 | } | |
432 | ||
433 | static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, | |
434 | struct zone *zone) | |
435 | { | |
436 | int order; | |
437 | ||
438 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
439 | for (order = 0; order < MAX_ORDER; ++order) | |
440 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); | |
441 | seq_putc(m, '\n'); | |
442 | } | |
443 | ||
444 | /* | |
445 | * This walks the free areas for each zone. | |
446 | */ | |
447 | static int frag_show(struct seq_file *m, void *arg) | |
448 | { | |
449 | pg_data_t *pgdat = (pg_data_t *)arg; | |
450 | walk_zones_in_node(m, pgdat, frag_show_print); | |
451 | return 0; | |
452 | } | |
453 | ||
454 | static void pagetypeinfo_showfree_print(struct seq_file *m, | |
455 | pg_data_t *pgdat, struct zone *zone) | |
456 | { | |
457 | int order, mtype; | |
458 | ||
459 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) { | |
460 | seq_printf(m, "Node %4d, zone %8s, type %12s ", | |
461 | pgdat->node_id, | |
462 | zone->name, | |
463 | migratetype_names[mtype]); | |
464 | for (order = 0; order < MAX_ORDER; ++order) { | |
465 | unsigned long freecount = 0; | |
466 | struct free_area *area; | |
467 | struct list_head *curr; | |
468 | ||
469 | area = &(zone->free_area[order]); | |
470 | ||
471 | list_for_each(curr, &area->free_list[mtype]) | |
472 | freecount++; | |
473 | seq_printf(m, "%6lu ", freecount); | |
474 | } | |
f6ac2354 CL |
475 | seq_putc(m, '\n'); |
476 | } | |
467c996c MG |
477 | } |
478 | ||
479 | /* Print out the free pages at each order for each migatetype */ | |
480 | static int pagetypeinfo_showfree(struct seq_file *m, void *arg) | |
481 | { | |
482 | int order; | |
483 | pg_data_t *pgdat = (pg_data_t *)arg; | |
484 | ||
485 | /* Print header */ | |
486 | seq_printf(m, "%-43s ", "Free pages count per migrate type at order"); | |
487 | for (order = 0; order < MAX_ORDER; ++order) | |
488 | seq_printf(m, "%6d ", order); | |
489 | seq_putc(m, '\n'); | |
490 | ||
491 | walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print); | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
496 | static void pagetypeinfo_showblockcount_print(struct seq_file *m, | |
497 | pg_data_t *pgdat, struct zone *zone) | |
498 | { | |
499 | int mtype; | |
500 | unsigned long pfn; | |
501 | unsigned long start_pfn = zone->zone_start_pfn; | |
502 | unsigned long end_pfn = start_pfn + zone->spanned_pages; | |
503 | unsigned long count[MIGRATE_TYPES] = { 0, }; | |
504 | ||
505 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { | |
506 | struct page *page; | |
507 | ||
508 | if (!pfn_valid(pfn)) | |
509 | continue; | |
510 | ||
511 | page = pfn_to_page(pfn); | |
eb33575c MG |
512 | |
513 | /* Watch for unexpected holes punched in the memmap */ | |
514 | if (!memmap_valid_within(pfn, page, zone)) | |
e80d6a24 | 515 | continue; |
eb33575c | 516 | |
467c996c MG |
517 | mtype = get_pageblock_migratetype(page); |
518 | ||
e80d6a24 MG |
519 | if (mtype < MIGRATE_TYPES) |
520 | count[mtype]++; | |
467c996c MG |
521 | } |
522 | ||
523 | /* Print counts */ | |
524 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
525 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) | |
526 | seq_printf(m, "%12lu ", count[mtype]); | |
527 | seq_putc(m, '\n'); | |
528 | } | |
529 | ||
530 | /* Print out the free pages at each order for each migratetype */ | |
531 | static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg) | |
532 | { | |
533 | int mtype; | |
534 | pg_data_t *pgdat = (pg_data_t *)arg; | |
535 | ||
536 | seq_printf(m, "\n%-23s", "Number of blocks type "); | |
537 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) | |
538 | seq_printf(m, "%12s ", migratetype_names[mtype]); | |
539 | seq_putc(m, '\n'); | |
540 | walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print); | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | /* | |
546 | * This prints out statistics in relation to grouping pages by mobility. | |
547 | * It is expensive to collect so do not constantly read the file. | |
548 | */ | |
549 | static int pagetypeinfo_show(struct seq_file *m, void *arg) | |
550 | { | |
551 | pg_data_t *pgdat = (pg_data_t *)arg; | |
552 | ||
41b25a37 KM |
553 | /* check memoryless node */ |
554 | if (!node_state(pgdat->node_id, N_HIGH_MEMORY)) | |
555 | return 0; | |
556 | ||
467c996c MG |
557 | seq_printf(m, "Page block order: %d\n", pageblock_order); |
558 | seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages); | |
559 | seq_putc(m, '\n'); | |
560 | pagetypeinfo_showfree(m, pgdat); | |
561 | pagetypeinfo_showblockcount(m, pgdat); | |
562 | ||
f6ac2354 CL |
563 | return 0; |
564 | } | |
565 | ||
8f32f7e5 | 566 | static const struct seq_operations fragmentation_op = { |
f6ac2354 CL |
567 | .start = frag_start, |
568 | .next = frag_next, | |
569 | .stop = frag_stop, | |
570 | .show = frag_show, | |
571 | }; | |
572 | ||
8f32f7e5 AD |
573 | static int fragmentation_open(struct inode *inode, struct file *file) |
574 | { | |
575 | return seq_open(file, &fragmentation_op); | |
576 | } | |
577 | ||
578 | static const struct file_operations fragmentation_file_operations = { | |
579 | .open = fragmentation_open, | |
580 | .read = seq_read, | |
581 | .llseek = seq_lseek, | |
582 | .release = seq_release, | |
583 | }; | |
584 | ||
74e2e8e8 | 585 | static const struct seq_operations pagetypeinfo_op = { |
467c996c MG |
586 | .start = frag_start, |
587 | .next = frag_next, | |
588 | .stop = frag_stop, | |
589 | .show = pagetypeinfo_show, | |
590 | }; | |
591 | ||
74e2e8e8 AD |
592 | static int pagetypeinfo_open(struct inode *inode, struct file *file) |
593 | { | |
594 | return seq_open(file, &pagetypeinfo_op); | |
595 | } | |
596 | ||
597 | static const struct file_operations pagetypeinfo_file_ops = { | |
598 | .open = pagetypeinfo_open, | |
599 | .read = seq_read, | |
600 | .llseek = seq_lseek, | |
601 | .release = seq_release, | |
602 | }; | |
603 | ||
4b51d669 CL |
604 | #ifdef CONFIG_ZONE_DMA |
605 | #define TEXT_FOR_DMA(xx) xx "_dma", | |
606 | #else | |
607 | #define TEXT_FOR_DMA(xx) | |
608 | #endif | |
609 | ||
27bf71c2 CL |
610 | #ifdef CONFIG_ZONE_DMA32 |
611 | #define TEXT_FOR_DMA32(xx) xx "_dma32", | |
612 | #else | |
613 | #define TEXT_FOR_DMA32(xx) | |
614 | #endif | |
615 | ||
616 | #ifdef CONFIG_HIGHMEM | |
617 | #define TEXT_FOR_HIGHMEM(xx) xx "_high", | |
618 | #else | |
619 | #define TEXT_FOR_HIGHMEM(xx) | |
620 | #endif | |
621 | ||
4b51d669 | 622 | #define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \ |
2a1e274a | 623 | TEXT_FOR_HIGHMEM(xx) xx "_movable", |
27bf71c2 | 624 | |
15ad7cdc | 625 | static const char * const vmstat_text[] = { |
2244b95a | 626 | /* Zoned VM counters */ |
d23ad423 | 627 | "nr_free_pages", |
4f98a2fe RR |
628 | "nr_inactive_anon", |
629 | "nr_active_anon", | |
630 | "nr_inactive_file", | |
631 | "nr_active_file", | |
7b854121 | 632 | "nr_unevictable", |
5344b7e6 | 633 | "nr_mlock", |
f3dbd344 | 634 | "nr_anon_pages", |
65ba55f5 | 635 | "nr_mapped", |
347ce434 | 636 | "nr_file_pages", |
51ed4491 CL |
637 | "nr_dirty", |
638 | "nr_writeback", | |
972d1a7b CL |
639 | "nr_slab_reclaimable", |
640 | "nr_slab_unreclaimable", | |
df849a15 | 641 | "nr_page_table_pages", |
c6a7f572 | 642 | "nr_kernel_stack", |
f6ac2354 | 643 | "nr_unstable", |
d2c5e30c | 644 | "nr_bounce", |
e129b5c2 | 645 | "nr_vmscan_write", |
fc3ba692 | 646 | "nr_writeback_temp", |
a731286d KM |
647 | "nr_isolated_anon", |
648 | "nr_isolated_file", | |
4b02108a | 649 | "nr_shmem", |
ca889e6c CL |
650 | #ifdef CONFIG_NUMA |
651 | "numa_hit", | |
652 | "numa_miss", | |
653 | "numa_foreign", | |
654 | "numa_interleave", | |
655 | "numa_local", | |
656 | "numa_other", | |
657 | #endif | |
658 | ||
f8891e5e | 659 | #ifdef CONFIG_VM_EVENT_COUNTERS |
f6ac2354 CL |
660 | "pgpgin", |
661 | "pgpgout", | |
662 | "pswpin", | |
663 | "pswpout", | |
664 | ||
27bf71c2 | 665 | TEXTS_FOR_ZONES("pgalloc") |
f6ac2354 CL |
666 | |
667 | "pgfree", | |
668 | "pgactivate", | |
669 | "pgdeactivate", | |
670 | ||
671 | "pgfault", | |
672 | "pgmajfault", | |
673 | ||
27bf71c2 CL |
674 | TEXTS_FOR_ZONES("pgrefill") |
675 | TEXTS_FOR_ZONES("pgsteal") | |
676 | TEXTS_FOR_ZONES("pgscan_kswapd") | |
677 | TEXTS_FOR_ZONES("pgscan_direct") | |
f6ac2354 | 678 | |
24cf7251 MG |
679 | #ifdef CONFIG_NUMA |
680 | "zone_reclaim_failed", | |
681 | #endif | |
f6ac2354 CL |
682 | "pginodesteal", |
683 | "slabs_scanned", | |
684 | "kswapd_steal", | |
685 | "kswapd_inodesteal", | |
bb3ab596 KM |
686 | "kswapd_low_wmark_hit_quickly", |
687 | "kswapd_high_wmark_hit_quickly", | |
688 | "kswapd_skip_congestion_wait", | |
f6ac2354 CL |
689 | "pageoutrun", |
690 | "allocstall", | |
691 | ||
692 | "pgrotated", | |
3b116300 AL |
693 | #ifdef CONFIG_HUGETLB_PAGE |
694 | "htlb_buddy_alloc_success", | |
695 | "htlb_buddy_alloc_fail", | |
696 | #endif | |
bbfd28ee LS |
697 | "unevictable_pgs_culled", |
698 | "unevictable_pgs_scanned", | |
699 | "unevictable_pgs_rescued", | |
5344b7e6 NP |
700 | "unevictable_pgs_mlocked", |
701 | "unevictable_pgs_munlocked", | |
702 | "unevictable_pgs_cleared", | |
703 | "unevictable_pgs_stranded", | |
985737cf | 704 | "unevictable_pgs_mlockfreed", |
bbfd28ee | 705 | #endif |
f6ac2354 CL |
706 | }; |
707 | ||
467c996c MG |
708 | static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, |
709 | struct zone *zone) | |
f6ac2354 | 710 | { |
467c996c MG |
711 | int i; |
712 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); | |
713 | seq_printf(m, | |
714 | "\n pages free %lu" | |
715 | "\n min %lu" | |
716 | "\n low %lu" | |
717 | "\n high %lu" | |
08d9ae7c | 718 | "\n scanned %lu" |
467c996c MG |
719 | "\n spanned %lu" |
720 | "\n present %lu", | |
721 | zone_page_state(zone, NR_FREE_PAGES), | |
41858966 MG |
722 | min_wmark_pages(zone), |
723 | low_wmark_pages(zone), | |
724 | high_wmark_pages(zone), | |
467c996c | 725 | zone->pages_scanned, |
467c996c MG |
726 | zone->spanned_pages, |
727 | zone->present_pages); | |
728 | ||
729 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
730 | seq_printf(m, "\n %-12s %lu", vmstat_text[i], | |
731 | zone_page_state(zone, i)); | |
732 | ||
733 | seq_printf(m, | |
734 | "\n protection: (%lu", | |
735 | zone->lowmem_reserve[0]); | |
736 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) | |
737 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); | |
738 | seq_printf(m, | |
739 | ")" | |
740 | "\n pagesets"); | |
741 | for_each_online_cpu(i) { | |
742 | struct per_cpu_pageset *pageset; | |
467c996c MG |
743 | |
744 | pageset = zone_pcp(zone, i); | |
3dfa5721 CL |
745 | seq_printf(m, |
746 | "\n cpu: %i" | |
747 | "\n count: %i" | |
748 | "\n high: %i" | |
749 | "\n batch: %i", | |
750 | i, | |
751 | pageset->pcp.count, | |
752 | pageset->pcp.high, | |
753 | pageset->pcp.batch); | |
df9ecaba | 754 | #ifdef CONFIG_SMP |
467c996c MG |
755 | seq_printf(m, "\n vm stats threshold: %d", |
756 | pageset->stat_threshold); | |
df9ecaba | 757 | #endif |
f6ac2354 | 758 | } |
467c996c MG |
759 | seq_printf(m, |
760 | "\n all_unreclaimable: %u" | |
761 | "\n prev_priority: %i" | |
556adecb RR |
762 | "\n start_pfn: %lu" |
763 | "\n inactive_ratio: %u", | |
e815af95 | 764 | zone_is_all_unreclaimable(zone), |
467c996c | 765 | zone->prev_priority, |
556adecb RR |
766 | zone->zone_start_pfn, |
767 | zone->inactive_ratio); | |
467c996c MG |
768 | seq_putc(m, '\n'); |
769 | } | |
770 | ||
771 | /* | |
772 | * Output information about zones in @pgdat. | |
773 | */ | |
774 | static int zoneinfo_show(struct seq_file *m, void *arg) | |
775 | { | |
776 | pg_data_t *pgdat = (pg_data_t *)arg; | |
777 | walk_zones_in_node(m, pgdat, zoneinfo_show_print); | |
f6ac2354 CL |
778 | return 0; |
779 | } | |
780 | ||
5c9fe628 | 781 | static const struct seq_operations zoneinfo_op = { |
f6ac2354 CL |
782 | .start = frag_start, /* iterate over all zones. The same as in |
783 | * fragmentation. */ | |
784 | .next = frag_next, | |
785 | .stop = frag_stop, | |
786 | .show = zoneinfo_show, | |
787 | }; | |
788 | ||
5c9fe628 AD |
789 | static int zoneinfo_open(struct inode *inode, struct file *file) |
790 | { | |
791 | return seq_open(file, &zoneinfo_op); | |
792 | } | |
793 | ||
794 | static const struct file_operations proc_zoneinfo_file_operations = { | |
795 | .open = zoneinfo_open, | |
796 | .read = seq_read, | |
797 | .llseek = seq_lseek, | |
798 | .release = seq_release, | |
799 | }; | |
800 | ||
f6ac2354 CL |
801 | static void *vmstat_start(struct seq_file *m, loff_t *pos) |
802 | { | |
2244b95a | 803 | unsigned long *v; |
f8891e5e CL |
804 | #ifdef CONFIG_VM_EVENT_COUNTERS |
805 | unsigned long *e; | |
806 | #endif | |
2244b95a | 807 | int i; |
f6ac2354 CL |
808 | |
809 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
810 | return NULL; | |
811 | ||
f8891e5e | 812 | #ifdef CONFIG_VM_EVENT_COUNTERS |
2244b95a | 813 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) |
f8891e5e CL |
814 | + sizeof(struct vm_event_state), GFP_KERNEL); |
815 | #else | |
816 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long), | |
817 | GFP_KERNEL); | |
818 | #endif | |
2244b95a CL |
819 | m->private = v; |
820 | if (!v) | |
f6ac2354 | 821 | return ERR_PTR(-ENOMEM); |
2244b95a CL |
822 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
823 | v[i] = global_page_state(i); | |
f8891e5e CL |
824 | #ifdef CONFIG_VM_EVENT_COUNTERS |
825 | e = v + NR_VM_ZONE_STAT_ITEMS; | |
826 | all_vm_events(e); | |
827 | e[PGPGIN] /= 2; /* sectors -> kbytes */ | |
828 | e[PGPGOUT] /= 2; | |
829 | #endif | |
2244b95a | 830 | return v + *pos; |
f6ac2354 CL |
831 | } |
832 | ||
833 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) | |
834 | { | |
835 | (*pos)++; | |
836 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
837 | return NULL; | |
838 | return (unsigned long *)m->private + *pos; | |
839 | } | |
840 | ||
841 | static int vmstat_show(struct seq_file *m, void *arg) | |
842 | { | |
843 | unsigned long *l = arg; | |
844 | unsigned long off = l - (unsigned long *)m->private; | |
845 | ||
846 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); | |
847 | return 0; | |
848 | } | |
849 | ||
850 | static void vmstat_stop(struct seq_file *m, void *arg) | |
851 | { | |
852 | kfree(m->private); | |
853 | m->private = NULL; | |
854 | } | |
855 | ||
b6aa44ab | 856 | static const struct seq_operations vmstat_op = { |
f6ac2354 CL |
857 | .start = vmstat_start, |
858 | .next = vmstat_next, | |
859 | .stop = vmstat_stop, | |
860 | .show = vmstat_show, | |
861 | }; | |
862 | ||
b6aa44ab AD |
863 | static int vmstat_open(struct inode *inode, struct file *file) |
864 | { | |
865 | return seq_open(file, &vmstat_op); | |
866 | } | |
867 | ||
868 | static const struct file_operations proc_vmstat_file_operations = { | |
869 | .open = vmstat_open, | |
870 | .read = seq_read, | |
871 | .llseek = seq_lseek, | |
872 | .release = seq_release, | |
873 | }; | |
f6ac2354 CL |
874 | #endif /* CONFIG_PROC_FS */ |
875 | ||
df9ecaba | 876 | #ifdef CONFIG_SMP |
d1187ed2 | 877 | static DEFINE_PER_CPU(struct delayed_work, vmstat_work); |
77461ab3 | 878 | int sysctl_stat_interval __read_mostly = HZ; |
d1187ed2 CL |
879 | |
880 | static void vmstat_update(struct work_struct *w) | |
881 | { | |
882 | refresh_cpu_vm_stats(smp_processor_id()); | |
77461ab3 | 883 | schedule_delayed_work(&__get_cpu_var(vmstat_work), |
98f4ebb2 | 884 | round_jiffies_relative(sysctl_stat_interval)); |
d1187ed2 CL |
885 | } |
886 | ||
42614fcd | 887 | static void __cpuinit start_cpu_timer(int cpu) |
d1187ed2 | 888 | { |
1871e52c | 889 | struct delayed_work *work = &per_cpu(vmstat_work, cpu); |
d1187ed2 | 890 | |
1871e52c TH |
891 | INIT_DELAYED_WORK_DEFERRABLE(work, vmstat_update); |
892 | schedule_delayed_work_on(cpu, work, __round_jiffies_relative(HZ, cpu)); | |
d1187ed2 CL |
893 | } |
894 | ||
df9ecaba CL |
895 | /* |
896 | * Use the cpu notifier to insure that the thresholds are recalculated | |
897 | * when necessary. | |
898 | */ | |
899 | static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb, | |
900 | unsigned long action, | |
901 | void *hcpu) | |
902 | { | |
d1187ed2 CL |
903 | long cpu = (long)hcpu; |
904 | ||
df9ecaba | 905 | switch (action) { |
d1187ed2 CL |
906 | case CPU_ONLINE: |
907 | case CPU_ONLINE_FROZEN: | |
908 | start_cpu_timer(cpu); | |
909 | break; | |
910 | case CPU_DOWN_PREPARE: | |
911 | case CPU_DOWN_PREPARE_FROZEN: | |
912 | cancel_rearming_delayed_work(&per_cpu(vmstat_work, cpu)); | |
913 | per_cpu(vmstat_work, cpu).work.func = NULL; | |
914 | break; | |
915 | case CPU_DOWN_FAILED: | |
916 | case CPU_DOWN_FAILED_FROZEN: | |
917 | start_cpu_timer(cpu); | |
918 | break; | |
ce421c79 | 919 | case CPU_DEAD: |
8bb78442 | 920 | case CPU_DEAD_FROZEN: |
ce421c79 AW |
921 | refresh_zone_stat_thresholds(); |
922 | break; | |
923 | default: | |
924 | break; | |
df9ecaba CL |
925 | } |
926 | return NOTIFY_OK; | |
927 | } | |
928 | ||
929 | static struct notifier_block __cpuinitdata vmstat_notifier = | |
930 | { &vmstat_cpuup_callback, NULL, 0 }; | |
8f32f7e5 | 931 | #endif |
df9ecaba | 932 | |
e2fc88d0 | 933 | static int __init setup_vmstat(void) |
df9ecaba | 934 | { |
8f32f7e5 | 935 | #ifdef CONFIG_SMP |
d1187ed2 CL |
936 | int cpu; |
937 | ||
df9ecaba CL |
938 | refresh_zone_stat_thresholds(); |
939 | register_cpu_notifier(&vmstat_notifier); | |
d1187ed2 CL |
940 | |
941 | for_each_online_cpu(cpu) | |
942 | start_cpu_timer(cpu); | |
8f32f7e5 AD |
943 | #endif |
944 | #ifdef CONFIG_PROC_FS | |
945 | proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations); | |
74e2e8e8 | 946 | proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops); |
b6aa44ab | 947 | proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations); |
5c9fe628 | 948 | proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations); |
8f32f7e5 | 949 | #endif |
df9ecaba CL |
950 | return 0; |
951 | } | |
952 | module_init(setup_vmstat) |