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) | |
99dcc3e5 CL |
142 | per_cpu_ptr(zone->pageset, cpu)->stat_threshold |
143 | = threshold; | |
df9ecaba | 144 | } |
2244b95a CL |
145 | } |
146 | ||
147 | /* | |
148 | * For use when we know that interrupts are disabled. | |
149 | */ | |
150 | void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
151 | int delta) | |
152 | { | |
99dcc3e5 CL |
153 | struct per_cpu_pageset *pcp = this_cpu_ptr(zone->pageset); |
154 | ||
df9ecaba | 155 | s8 *p = pcp->vm_stat_diff + item; |
2244b95a CL |
156 | long x; |
157 | ||
2244b95a CL |
158 | x = delta + *p; |
159 | ||
df9ecaba | 160 | if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) { |
2244b95a CL |
161 | zone_page_state_add(x, zone, item); |
162 | x = 0; | |
163 | } | |
2244b95a CL |
164 | *p = x; |
165 | } | |
166 | EXPORT_SYMBOL(__mod_zone_page_state); | |
167 | ||
168 | /* | |
169 | * For an unknown interrupt state | |
170 | */ | |
171 | void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
172 | int delta) | |
173 | { | |
174 | unsigned long flags; | |
175 | ||
176 | local_irq_save(flags); | |
177 | __mod_zone_page_state(zone, item, delta); | |
178 | local_irq_restore(flags); | |
179 | } | |
180 | EXPORT_SYMBOL(mod_zone_page_state); | |
181 | ||
182 | /* | |
183 | * Optimized increment and decrement functions. | |
184 | * | |
185 | * These are only for a single page and therefore can take a struct page * | |
186 | * argument instead of struct zone *. This allows the inclusion of the code | |
187 | * generated for page_zone(page) into the optimized functions. | |
188 | * | |
189 | * No overflow check is necessary and therefore the differential can be | |
190 | * incremented or decremented in place which may allow the compilers to | |
191 | * generate better code. | |
2244b95a CL |
192 | * The increment or decrement is known and therefore one boundary check can |
193 | * be omitted. | |
194 | * | |
df9ecaba CL |
195 | * NOTE: These functions are very performance sensitive. Change only |
196 | * with care. | |
197 | * | |
2244b95a CL |
198 | * Some processors have inc/dec instructions that are atomic vs an interrupt. |
199 | * However, the code must first determine the differential location in a zone | |
200 | * based on the processor number and then inc/dec the counter. There is no | |
201 | * guarantee without disabling preemption that the processor will not change | |
202 | * in between and therefore the atomicity vs. interrupt cannot be exploited | |
203 | * in a useful way here. | |
204 | */ | |
c8785385 | 205 | void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 206 | { |
99dcc3e5 | 207 | struct per_cpu_pageset *pcp = this_cpu_ptr(zone->pageset); |
df9ecaba | 208 | s8 *p = pcp->vm_stat_diff + item; |
2244b95a CL |
209 | |
210 | (*p)++; | |
211 | ||
df9ecaba CL |
212 | if (unlikely(*p > pcp->stat_threshold)) { |
213 | int overstep = pcp->stat_threshold / 2; | |
214 | ||
215 | zone_page_state_add(*p + overstep, zone, item); | |
216 | *p = -overstep; | |
2244b95a CL |
217 | } |
218 | } | |
ca889e6c CL |
219 | |
220 | void __inc_zone_page_state(struct page *page, enum zone_stat_item item) | |
221 | { | |
222 | __inc_zone_state(page_zone(page), item); | |
223 | } | |
2244b95a CL |
224 | EXPORT_SYMBOL(__inc_zone_page_state); |
225 | ||
c8785385 | 226 | void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 227 | { |
99dcc3e5 | 228 | struct per_cpu_pageset *pcp = this_cpu_ptr(zone->pageset); |
df9ecaba | 229 | s8 *p = pcp->vm_stat_diff + item; |
2244b95a CL |
230 | |
231 | (*p)--; | |
232 | ||
df9ecaba CL |
233 | if (unlikely(*p < - pcp->stat_threshold)) { |
234 | int overstep = pcp->stat_threshold / 2; | |
235 | ||
236 | zone_page_state_add(*p - overstep, zone, item); | |
237 | *p = overstep; | |
2244b95a CL |
238 | } |
239 | } | |
c8785385 CL |
240 | |
241 | void __dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
242 | { | |
243 | __dec_zone_state(page_zone(page), item); | |
244 | } | |
2244b95a CL |
245 | EXPORT_SYMBOL(__dec_zone_page_state); |
246 | ||
ca889e6c CL |
247 | void inc_zone_state(struct zone *zone, enum zone_stat_item item) |
248 | { | |
249 | unsigned long flags; | |
250 | ||
251 | local_irq_save(flags); | |
252 | __inc_zone_state(zone, item); | |
253 | local_irq_restore(flags); | |
254 | } | |
255 | ||
2244b95a CL |
256 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
257 | { | |
258 | unsigned long flags; | |
259 | struct zone *zone; | |
2244b95a CL |
260 | |
261 | zone = page_zone(page); | |
262 | local_irq_save(flags); | |
ca889e6c | 263 | __inc_zone_state(zone, item); |
2244b95a CL |
264 | local_irq_restore(flags); |
265 | } | |
266 | EXPORT_SYMBOL(inc_zone_page_state); | |
267 | ||
268 | void dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
269 | { | |
270 | unsigned long flags; | |
2244b95a | 271 | |
2244b95a | 272 | local_irq_save(flags); |
a302eb4e | 273 | __dec_zone_page_state(page, item); |
2244b95a CL |
274 | local_irq_restore(flags); |
275 | } | |
276 | EXPORT_SYMBOL(dec_zone_page_state); | |
277 | ||
278 | /* | |
279 | * Update the zone counters for one cpu. | |
4037d452 | 280 | * |
a7f75e25 CL |
281 | * The cpu specified must be either the current cpu or a processor that |
282 | * is not online. If it is the current cpu then the execution thread must | |
283 | * be pinned to the current cpu. | |
284 | * | |
4037d452 CL |
285 | * Note that refresh_cpu_vm_stats strives to only access |
286 | * node local memory. The per cpu pagesets on remote zones are placed | |
287 | * in the memory local to the processor using that pageset. So the | |
288 | * loop over all zones will access a series of cachelines local to | |
289 | * the processor. | |
290 | * | |
291 | * The call to zone_page_state_add updates the cachelines with the | |
292 | * statistics in the remote zone struct as well as the global cachelines | |
293 | * with the global counters. These could cause remote node cache line | |
294 | * bouncing and will have to be only done when necessary. | |
2244b95a CL |
295 | */ |
296 | void refresh_cpu_vm_stats(int cpu) | |
297 | { | |
298 | struct zone *zone; | |
299 | int i; | |
a7f75e25 | 300 | int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, }; |
2244b95a | 301 | |
ee99c71c | 302 | for_each_populated_zone(zone) { |
4037d452 | 303 | struct per_cpu_pageset *p; |
2244b95a | 304 | |
99dcc3e5 | 305 | p = per_cpu_ptr(zone->pageset, cpu); |
2244b95a CL |
306 | |
307 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
4037d452 | 308 | if (p->vm_stat_diff[i]) { |
a7f75e25 CL |
309 | unsigned long flags; |
310 | int v; | |
311 | ||
2244b95a | 312 | local_irq_save(flags); |
a7f75e25 | 313 | v = p->vm_stat_diff[i]; |
4037d452 | 314 | p->vm_stat_diff[i] = 0; |
a7f75e25 CL |
315 | local_irq_restore(flags); |
316 | atomic_long_add(v, &zone->vm_stat[i]); | |
317 | global_diff[i] += v; | |
4037d452 CL |
318 | #ifdef CONFIG_NUMA |
319 | /* 3 seconds idle till flush */ | |
320 | p->expire = 3; | |
321 | #endif | |
2244b95a | 322 | } |
468fd62e | 323 | cond_resched(); |
4037d452 CL |
324 | #ifdef CONFIG_NUMA |
325 | /* | |
326 | * Deal with draining the remote pageset of this | |
327 | * processor | |
328 | * | |
329 | * Check if there are pages remaining in this pageset | |
330 | * if not then there is nothing to expire. | |
331 | */ | |
3dfa5721 | 332 | if (!p->expire || !p->pcp.count) |
4037d452 CL |
333 | continue; |
334 | ||
335 | /* | |
336 | * We never drain zones local to this processor. | |
337 | */ | |
338 | if (zone_to_nid(zone) == numa_node_id()) { | |
339 | p->expire = 0; | |
340 | continue; | |
341 | } | |
342 | ||
343 | p->expire--; | |
344 | if (p->expire) | |
345 | continue; | |
346 | ||
3dfa5721 CL |
347 | if (p->pcp.count) |
348 | drain_zone_pages(zone, &p->pcp); | |
4037d452 | 349 | #endif |
2244b95a | 350 | } |
a7f75e25 CL |
351 | |
352 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
353 | if (global_diff[i]) | |
354 | atomic_long_add(global_diff[i], &vm_stat[i]); | |
2244b95a CL |
355 | } |
356 | ||
2244b95a CL |
357 | #endif |
358 | ||
ca889e6c CL |
359 | #ifdef CONFIG_NUMA |
360 | /* | |
361 | * zonelist = the list of zones passed to the allocator | |
362 | * z = the zone from which the allocation occurred. | |
363 | * | |
364 | * Must be called with interrupts disabled. | |
365 | */ | |
18ea7e71 | 366 | void zone_statistics(struct zone *preferred_zone, struct zone *z) |
ca889e6c | 367 | { |
18ea7e71 | 368 | if (z->zone_pgdat == preferred_zone->zone_pgdat) { |
ca889e6c CL |
369 | __inc_zone_state(z, NUMA_HIT); |
370 | } else { | |
371 | __inc_zone_state(z, NUMA_MISS); | |
18ea7e71 | 372 | __inc_zone_state(preferred_zone, NUMA_FOREIGN); |
ca889e6c | 373 | } |
5d292343 | 374 | if (z->node == numa_node_id()) |
ca889e6c CL |
375 | __inc_zone_state(z, NUMA_LOCAL); |
376 | else | |
377 | __inc_zone_state(z, NUMA_OTHER); | |
378 | } | |
379 | #endif | |
380 | ||
f6ac2354 | 381 | #ifdef CONFIG_PROC_FS |
8f32f7e5 | 382 | #include <linux/proc_fs.h> |
f6ac2354 CL |
383 | #include <linux/seq_file.h> |
384 | ||
467c996c MG |
385 | static char * const migratetype_names[MIGRATE_TYPES] = { |
386 | "Unmovable", | |
387 | "Reclaimable", | |
388 | "Movable", | |
389 | "Reserve", | |
91446b06 | 390 | "Isolate", |
467c996c MG |
391 | }; |
392 | ||
f6ac2354 CL |
393 | static void *frag_start(struct seq_file *m, loff_t *pos) |
394 | { | |
395 | pg_data_t *pgdat; | |
396 | loff_t node = *pos; | |
397 | for (pgdat = first_online_pgdat(); | |
398 | pgdat && node; | |
399 | pgdat = next_online_pgdat(pgdat)) | |
400 | --node; | |
401 | ||
402 | return pgdat; | |
403 | } | |
404 | ||
405 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) | |
406 | { | |
407 | pg_data_t *pgdat = (pg_data_t *)arg; | |
408 | ||
409 | (*pos)++; | |
410 | return next_online_pgdat(pgdat); | |
411 | } | |
412 | ||
413 | static void frag_stop(struct seq_file *m, void *arg) | |
414 | { | |
415 | } | |
416 | ||
467c996c MG |
417 | /* Walk all the zones in a node and print using a callback */ |
418 | static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat, | |
419 | void (*print)(struct seq_file *m, pg_data_t *, struct zone *)) | |
f6ac2354 | 420 | { |
f6ac2354 CL |
421 | struct zone *zone; |
422 | struct zone *node_zones = pgdat->node_zones; | |
423 | unsigned long flags; | |
f6ac2354 CL |
424 | |
425 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { | |
426 | if (!populated_zone(zone)) | |
427 | continue; | |
428 | ||
429 | spin_lock_irqsave(&zone->lock, flags); | |
467c996c | 430 | print(m, pgdat, zone); |
f6ac2354 | 431 | spin_unlock_irqrestore(&zone->lock, flags); |
467c996c MG |
432 | } |
433 | } | |
434 | ||
435 | static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, | |
436 | struct zone *zone) | |
437 | { | |
438 | int order; | |
439 | ||
440 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
441 | for (order = 0; order < MAX_ORDER; ++order) | |
442 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); | |
443 | seq_putc(m, '\n'); | |
444 | } | |
445 | ||
446 | /* | |
447 | * This walks the free areas for each zone. | |
448 | */ | |
449 | static int frag_show(struct seq_file *m, void *arg) | |
450 | { | |
451 | pg_data_t *pgdat = (pg_data_t *)arg; | |
452 | walk_zones_in_node(m, pgdat, frag_show_print); | |
453 | return 0; | |
454 | } | |
455 | ||
456 | static void pagetypeinfo_showfree_print(struct seq_file *m, | |
457 | pg_data_t *pgdat, struct zone *zone) | |
458 | { | |
459 | int order, mtype; | |
460 | ||
461 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) { | |
462 | seq_printf(m, "Node %4d, zone %8s, type %12s ", | |
463 | pgdat->node_id, | |
464 | zone->name, | |
465 | migratetype_names[mtype]); | |
466 | for (order = 0; order < MAX_ORDER; ++order) { | |
467 | unsigned long freecount = 0; | |
468 | struct free_area *area; | |
469 | struct list_head *curr; | |
470 | ||
471 | area = &(zone->free_area[order]); | |
472 | ||
473 | list_for_each(curr, &area->free_list[mtype]) | |
474 | freecount++; | |
475 | seq_printf(m, "%6lu ", freecount); | |
476 | } | |
f6ac2354 CL |
477 | seq_putc(m, '\n'); |
478 | } | |
467c996c MG |
479 | } |
480 | ||
481 | /* Print out the free pages at each order for each migatetype */ | |
482 | static int pagetypeinfo_showfree(struct seq_file *m, void *arg) | |
483 | { | |
484 | int order; | |
485 | pg_data_t *pgdat = (pg_data_t *)arg; | |
486 | ||
487 | /* Print header */ | |
488 | seq_printf(m, "%-43s ", "Free pages count per migrate type at order"); | |
489 | for (order = 0; order < MAX_ORDER; ++order) | |
490 | seq_printf(m, "%6d ", order); | |
491 | seq_putc(m, '\n'); | |
492 | ||
493 | walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print); | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | static void pagetypeinfo_showblockcount_print(struct seq_file *m, | |
499 | pg_data_t *pgdat, struct zone *zone) | |
500 | { | |
501 | int mtype; | |
502 | unsigned long pfn; | |
503 | unsigned long start_pfn = zone->zone_start_pfn; | |
504 | unsigned long end_pfn = start_pfn + zone->spanned_pages; | |
505 | unsigned long count[MIGRATE_TYPES] = { 0, }; | |
506 | ||
507 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { | |
508 | struct page *page; | |
509 | ||
510 | if (!pfn_valid(pfn)) | |
511 | continue; | |
512 | ||
513 | page = pfn_to_page(pfn); | |
eb33575c MG |
514 | |
515 | /* Watch for unexpected holes punched in the memmap */ | |
516 | if (!memmap_valid_within(pfn, page, zone)) | |
e80d6a24 | 517 | continue; |
eb33575c | 518 | |
467c996c MG |
519 | mtype = get_pageblock_migratetype(page); |
520 | ||
e80d6a24 MG |
521 | if (mtype < MIGRATE_TYPES) |
522 | count[mtype]++; | |
467c996c MG |
523 | } |
524 | ||
525 | /* Print counts */ | |
526 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
527 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) | |
528 | seq_printf(m, "%12lu ", count[mtype]); | |
529 | seq_putc(m, '\n'); | |
530 | } | |
531 | ||
532 | /* Print out the free pages at each order for each migratetype */ | |
533 | static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg) | |
534 | { | |
535 | int mtype; | |
536 | pg_data_t *pgdat = (pg_data_t *)arg; | |
537 | ||
538 | seq_printf(m, "\n%-23s", "Number of blocks type "); | |
539 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) | |
540 | seq_printf(m, "%12s ", migratetype_names[mtype]); | |
541 | seq_putc(m, '\n'); | |
542 | walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print); | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
547 | /* | |
548 | * This prints out statistics in relation to grouping pages by mobility. | |
549 | * It is expensive to collect so do not constantly read the file. | |
550 | */ | |
551 | static int pagetypeinfo_show(struct seq_file *m, void *arg) | |
552 | { | |
553 | pg_data_t *pgdat = (pg_data_t *)arg; | |
554 | ||
41b25a37 KM |
555 | /* check memoryless node */ |
556 | if (!node_state(pgdat->node_id, N_HIGH_MEMORY)) | |
557 | return 0; | |
558 | ||
467c996c MG |
559 | seq_printf(m, "Page block order: %d\n", pageblock_order); |
560 | seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages); | |
561 | seq_putc(m, '\n'); | |
562 | pagetypeinfo_showfree(m, pgdat); | |
563 | pagetypeinfo_showblockcount(m, pgdat); | |
564 | ||
f6ac2354 CL |
565 | return 0; |
566 | } | |
567 | ||
8f32f7e5 | 568 | static const struct seq_operations fragmentation_op = { |
f6ac2354 CL |
569 | .start = frag_start, |
570 | .next = frag_next, | |
571 | .stop = frag_stop, | |
572 | .show = frag_show, | |
573 | }; | |
574 | ||
8f32f7e5 AD |
575 | static int fragmentation_open(struct inode *inode, struct file *file) |
576 | { | |
577 | return seq_open(file, &fragmentation_op); | |
578 | } | |
579 | ||
580 | static const struct file_operations fragmentation_file_operations = { | |
581 | .open = fragmentation_open, | |
582 | .read = seq_read, | |
583 | .llseek = seq_lseek, | |
584 | .release = seq_release, | |
585 | }; | |
586 | ||
74e2e8e8 | 587 | static const struct seq_operations pagetypeinfo_op = { |
467c996c MG |
588 | .start = frag_start, |
589 | .next = frag_next, | |
590 | .stop = frag_stop, | |
591 | .show = pagetypeinfo_show, | |
592 | }; | |
593 | ||
74e2e8e8 AD |
594 | static int pagetypeinfo_open(struct inode *inode, struct file *file) |
595 | { | |
596 | return seq_open(file, &pagetypeinfo_op); | |
597 | } | |
598 | ||
599 | static const struct file_operations pagetypeinfo_file_ops = { | |
600 | .open = pagetypeinfo_open, | |
601 | .read = seq_read, | |
602 | .llseek = seq_lseek, | |
603 | .release = seq_release, | |
604 | }; | |
605 | ||
4b51d669 CL |
606 | #ifdef CONFIG_ZONE_DMA |
607 | #define TEXT_FOR_DMA(xx) xx "_dma", | |
608 | #else | |
609 | #define TEXT_FOR_DMA(xx) | |
610 | #endif | |
611 | ||
27bf71c2 CL |
612 | #ifdef CONFIG_ZONE_DMA32 |
613 | #define TEXT_FOR_DMA32(xx) xx "_dma32", | |
614 | #else | |
615 | #define TEXT_FOR_DMA32(xx) | |
616 | #endif | |
617 | ||
618 | #ifdef CONFIG_HIGHMEM | |
619 | #define TEXT_FOR_HIGHMEM(xx) xx "_high", | |
620 | #else | |
621 | #define TEXT_FOR_HIGHMEM(xx) | |
622 | #endif | |
623 | ||
4b51d669 | 624 | #define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \ |
2a1e274a | 625 | TEXT_FOR_HIGHMEM(xx) xx "_movable", |
27bf71c2 | 626 | |
15ad7cdc | 627 | static const char * const vmstat_text[] = { |
2244b95a | 628 | /* Zoned VM counters */ |
d23ad423 | 629 | "nr_free_pages", |
4f98a2fe RR |
630 | "nr_inactive_anon", |
631 | "nr_active_anon", | |
632 | "nr_inactive_file", | |
633 | "nr_active_file", | |
7b854121 | 634 | "nr_unevictable", |
5344b7e6 | 635 | "nr_mlock", |
f3dbd344 | 636 | "nr_anon_pages", |
65ba55f5 | 637 | "nr_mapped", |
347ce434 | 638 | "nr_file_pages", |
51ed4491 CL |
639 | "nr_dirty", |
640 | "nr_writeback", | |
972d1a7b CL |
641 | "nr_slab_reclaimable", |
642 | "nr_slab_unreclaimable", | |
df849a15 | 643 | "nr_page_table_pages", |
c6a7f572 | 644 | "nr_kernel_stack", |
f6ac2354 | 645 | "nr_unstable", |
d2c5e30c | 646 | "nr_bounce", |
e129b5c2 | 647 | "nr_vmscan_write", |
fc3ba692 | 648 | "nr_writeback_temp", |
a731286d KM |
649 | "nr_isolated_anon", |
650 | "nr_isolated_file", | |
4b02108a | 651 | "nr_shmem", |
ca889e6c CL |
652 | #ifdef CONFIG_NUMA |
653 | "numa_hit", | |
654 | "numa_miss", | |
655 | "numa_foreign", | |
656 | "numa_interleave", | |
657 | "numa_local", | |
658 | "numa_other", | |
659 | #endif | |
660 | ||
f8891e5e | 661 | #ifdef CONFIG_VM_EVENT_COUNTERS |
f6ac2354 CL |
662 | "pgpgin", |
663 | "pgpgout", | |
664 | "pswpin", | |
665 | "pswpout", | |
666 | ||
27bf71c2 | 667 | TEXTS_FOR_ZONES("pgalloc") |
f6ac2354 CL |
668 | |
669 | "pgfree", | |
670 | "pgactivate", | |
671 | "pgdeactivate", | |
672 | ||
673 | "pgfault", | |
674 | "pgmajfault", | |
675 | ||
27bf71c2 CL |
676 | TEXTS_FOR_ZONES("pgrefill") |
677 | TEXTS_FOR_ZONES("pgsteal") | |
678 | TEXTS_FOR_ZONES("pgscan_kswapd") | |
679 | TEXTS_FOR_ZONES("pgscan_direct") | |
f6ac2354 | 680 | |
24cf7251 MG |
681 | #ifdef CONFIG_NUMA |
682 | "zone_reclaim_failed", | |
683 | #endif | |
f6ac2354 CL |
684 | "pginodesteal", |
685 | "slabs_scanned", | |
686 | "kswapd_steal", | |
687 | "kswapd_inodesteal", | |
bb3ab596 KM |
688 | "kswapd_low_wmark_hit_quickly", |
689 | "kswapd_high_wmark_hit_quickly", | |
690 | "kswapd_skip_congestion_wait", | |
f6ac2354 CL |
691 | "pageoutrun", |
692 | "allocstall", | |
693 | ||
694 | "pgrotated", | |
3b116300 AL |
695 | #ifdef CONFIG_HUGETLB_PAGE |
696 | "htlb_buddy_alloc_success", | |
697 | "htlb_buddy_alloc_fail", | |
698 | #endif | |
bbfd28ee LS |
699 | "unevictable_pgs_culled", |
700 | "unevictable_pgs_scanned", | |
701 | "unevictable_pgs_rescued", | |
5344b7e6 NP |
702 | "unevictable_pgs_mlocked", |
703 | "unevictable_pgs_munlocked", | |
704 | "unevictable_pgs_cleared", | |
705 | "unevictable_pgs_stranded", | |
985737cf | 706 | "unevictable_pgs_mlockfreed", |
bbfd28ee | 707 | #endif |
f6ac2354 CL |
708 | }; |
709 | ||
467c996c MG |
710 | static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, |
711 | struct zone *zone) | |
f6ac2354 | 712 | { |
467c996c MG |
713 | int i; |
714 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); | |
715 | seq_printf(m, | |
716 | "\n pages free %lu" | |
717 | "\n min %lu" | |
718 | "\n low %lu" | |
719 | "\n high %lu" | |
08d9ae7c | 720 | "\n scanned %lu" |
467c996c MG |
721 | "\n spanned %lu" |
722 | "\n present %lu", | |
723 | zone_page_state(zone, NR_FREE_PAGES), | |
41858966 MG |
724 | min_wmark_pages(zone), |
725 | low_wmark_pages(zone), | |
726 | high_wmark_pages(zone), | |
467c996c | 727 | zone->pages_scanned, |
467c996c MG |
728 | zone->spanned_pages, |
729 | zone->present_pages); | |
730 | ||
731 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
732 | seq_printf(m, "\n %-12s %lu", vmstat_text[i], | |
733 | zone_page_state(zone, i)); | |
734 | ||
735 | seq_printf(m, | |
736 | "\n protection: (%lu", | |
737 | zone->lowmem_reserve[0]); | |
738 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) | |
739 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); | |
740 | seq_printf(m, | |
741 | ")" | |
742 | "\n pagesets"); | |
743 | for_each_online_cpu(i) { | |
744 | struct per_cpu_pageset *pageset; | |
467c996c | 745 | |
99dcc3e5 | 746 | pageset = per_cpu_ptr(zone->pageset, i); |
3dfa5721 CL |
747 | seq_printf(m, |
748 | "\n cpu: %i" | |
749 | "\n count: %i" | |
750 | "\n high: %i" | |
751 | "\n batch: %i", | |
752 | i, | |
753 | pageset->pcp.count, | |
754 | pageset->pcp.high, | |
755 | pageset->pcp.batch); | |
df9ecaba | 756 | #ifdef CONFIG_SMP |
467c996c MG |
757 | seq_printf(m, "\n vm stats threshold: %d", |
758 | pageset->stat_threshold); | |
df9ecaba | 759 | #endif |
f6ac2354 | 760 | } |
467c996c MG |
761 | seq_printf(m, |
762 | "\n all_unreclaimable: %u" | |
763 | "\n prev_priority: %i" | |
556adecb RR |
764 | "\n start_pfn: %lu" |
765 | "\n inactive_ratio: %u", | |
e815af95 | 766 | zone_is_all_unreclaimable(zone), |
467c996c | 767 | zone->prev_priority, |
556adecb RR |
768 | zone->zone_start_pfn, |
769 | zone->inactive_ratio); | |
467c996c MG |
770 | seq_putc(m, '\n'); |
771 | } | |
772 | ||
773 | /* | |
774 | * Output information about zones in @pgdat. | |
775 | */ | |
776 | static int zoneinfo_show(struct seq_file *m, void *arg) | |
777 | { | |
778 | pg_data_t *pgdat = (pg_data_t *)arg; | |
779 | walk_zones_in_node(m, pgdat, zoneinfo_show_print); | |
f6ac2354 CL |
780 | return 0; |
781 | } | |
782 | ||
5c9fe628 | 783 | static const struct seq_operations zoneinfo_op = { |
f6ac2354 CL |
784 | .start = frag_start, /* iterate over all zones. The same as in |
785 | * fragmentation. */ | |
786 | .next = frag_next, | |
787 | .stop = frag_stop, | |
788 | .show = zoneinfo_show, | |
789 | }; | |
790 | ||
5c9fe628 AD |
791 | static int zoneinfo_open(struct inode *inode, struct file *file) |
792 | { | |
793 | return seq_open(file, &zoneinfo_op); | |
794 | } | |
795 | ||
796 | static const struct file_operations proc_zoneinfo_file_operations = { | |
797 | .open = zoneinfo_open, | |
798 | .read = seq_read, | |
799 | .llseek = seq_lseek, | |
800 | .release = seq_release, | |
801 | }; | |
802 | ||
f6ac2354 CL |
803 | static void *vmstat_start(struct seq_file *m, loff_t *pos) |
804 | { | |
2244b95a | 805 | unsigned long *v; |
f8891e5e CL |
806 | #ifdef CONFIG_VM_EVENT_COUNTERS |
807 | unsigned long *e; | |
808 | #endif | |
2244b95a | 809 | int i; |
f6ac2354 CL |
810 | |
811 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
812 | return NULL; | |
813 | ||
f8891e5e | 814 | #ifdef CONFIG_VM_EVENT_COUNTERS |
2244b95a | 815 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) |
f8891e5e CL |
816 | + sizeof(struct vm_event_state), GFP_KERNEL); |
817 | #else | |
818 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long), | |
819 | GFP_KERNEL); | |
820 | #endif | |
2244b95a CL |
821 | m->private = v; |
822 | if (!v) | |
f6ac2354 | 823 | return ERR_PTR(-ENOMEM); |
2244b95a CL |
824 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
825 | v[i] = global_page_state(i); | |
f8891e5e CL |
826 | #ifdef CONFIG_VM_EVENT_COUNTERS |
827 | e = v + NR_VM_ZONE_STAT_ITEMS; | |
828 | all_vm_events(e); | |
829 | e[PGPGIN] /= 2; /* sectors -> kbytes */ | |
830 | e[PGPGOUT] /= 2; | |
831 | #endif | |
2244b95a | 832 | return v + *pos; |
f6ac2354 CL |
833 | } |
834 | ||
835 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) | |
836 | { | |
837 | (*pos)++; | |
838 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
839 | return NULL; | |
840 | return (unsigned long *)m->private + *pos; | |
841 | } | |
842 | ||
843 | static int vmstat_show(struct seq_file *m, void *arg) | |
844 | { | |
845 | unsigned long *l = arg; | |
846 | unsigned long off = l - (unsigned long *)m->private; | |
847 | ||
848 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); | |
849 | return 0; | |
850 | } | |
851 | ||
852 | static void vmstat_stop(struct seq_file *m, void *arg) | |
853 | { | |
854 | kfree(m->private); | |
855 | m->private = NULL; | |
856 | } | |
857 | ||
b6aa44ab | 858 | static const struct seq_operations vmstat_op = { |
f6ac2354 CL |
859 | .start = vmstat_start, |
860 | .next = vmstat_next, | |
861 | .stop = vmstat_stop, | |
862 | .show = vmstat_show, | |
863 | }; | |
864 | ||
b6aa44ab AD |
865 | static int vmstat_open(struct inode *inode, struct file *file) |
866 | { | |
867 | return seq_open(file, &vmstat_op); | |
868 | } | |
869 | ||
870 | static const struct file_operations proc_vmstat_file_operations = { | |
871 | .open = vmstat_open, | |
872 | .read = seq_read, | |
873 | .llseek = seq_lseek, | |
874 | .release = seq_release, | |
875 | }; | |
f6ac2354 CL |
876 | #endif /* CONFIG_PROC_FS */ |
877 | ||
df9ecaba | 878 | #ifdef CONFIG_SMP |
d1187ed2 | 879 | static DEFINE_PER_CPU(struct delayed_work, vmstat_work); |
77461ab3 | 880 | int sysctl_stat_interval __read_mostly = HZ; |
d1187ed2 CL |
881 | |
882 | static void vmstat_update(struct work_struct *w) | |
883 | { | |
884 | refresh_cpu_vm_stats(smp_processor_id()); | |
77461ab3 | 885 | schedule_delayed_work(&__get_cpu_var(vmstat_work), |
98f4ebb2 | 886 | round_jiffies_relative(sysctl_stat_interval)); |
d1187ed2 CL |
887 | } |
888 | ||
42614fcd | 889 | static void __cpuinit start_cpu_timer(int cpu) |
d1187ed2 | 890 | { |
1871e52c | 891 | struct delayed_work *work = &per_cpu(vmstat_work, cpu); |
d1187ed2 | 892 | |
1871e52c TH |
893 | INIT_DELAYED_WORK_DEFERRABLE(work, vmstat_update); |
894 | schedule_delayed_work_on(cpu, work, __round_jiffies_relative(HZ, cpu)); | |
d1187ed2 CL |
895 | } |
896 | ||
df9ecaba CL |
897 | /* |
898 | * Use the cpu notifier to insure that the thresholds are recalculated | |
899 | * when necessary. | |
900 | */ | |
901 | static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb, | |
902 | unsigned long action, | |
903 | void *hcpu) | |
904 | { | |
d1187ed2 CL |
905 | long cpu = (long)hcpu; |
906 | ||
df9ecaba | 907 | switch (action) { |
d1187ed2 CL |
908 | case CPU_ONLINE: |
909 | case CPU_ONLINE_FROZEN: | |
910 | start_cpu_timer(cpu); | |
ad596925 | 911 | node_set_state(cpu_to_node(cpu), N_CPU); |
d1187ed2 CL |
912 | break; |
913 | case CPU_DOWN_PREPARE: | |
914 | case CPU_DOWN_PREPARE_FROZEN: | |
915 | cancel_rearming_delayed_work(&per_cpu(vmstat_work, cpu)); | |
916 | per_cpu(vmstat_work, cpu).work.func = NULL; | |
917 | break; | |
918 | case CPU_DOWN_FAILED: | |
919 | case CPU_DOWN_FAILED_FROZEN: | |
920 | start_cpu_timer(cpu); | |
921 | break; | |
ce421c79 | 922 | case CPU_DEAD: |
8bb78442 | 923 | case CPU_DEAD_FROZEN: |
ce421c79 AW |
924 | refresh_zone_stat_thresholds(); |
925 | break; | |
926 | default: | |
927 | break; | |
df9ecaba CL |
928 | } |
929 | return NOTIFY_OK; | |
930 | } | |
931 | ||
932 | static struct notifier_block __cpuinitdata vmstat_notifier = | |
933 | { &vmstat_cpuup_callback, NULL, 0 }; | |
8f32f7e5 | 934 | #endif |
df9ecaba | 935 | |
e2fc88d0 | 936 | static int __init setup_vmstat(void) |
df9ecaba | 937 | { |
8f32f7e5 | 938 | #ifdef CONFIG_SMP |
d1187ed2 CL |
939 | int cpu; |
940 | ||
df9ecaba CL |
941 | refresh_zone_stat_thresholds(); |
942 | register_cpu_notifier(&vmstat_notifier); | |
d1187ed2 CL |
943 | |
944 | for_each_online_cpu(cpu) | |
945 | start_cpu_timer(cpu); | |
8f32f7e5 AD |
946 | #endif |
947 | #ifdef CONFIG_PROC_FS | |
948 | proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations); | |
74e2e8e8 | 949 | proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops); |
b6aa44ab | 950 | proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations); |
5c9fe628 | 951 | proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations); |
8f32f7e5 | 952 | #endif |
df9ecaba CL |
953 | return 0; |
954 | } | |
955 | module_init(setup_vmstat) |