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f6ac2354 CL |
1 | /* |
2 | * linux/mm/vmstat.c | |
3 | * | |
4 | * Manages VM statistics | |
5 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
2244b95a CL |
6 | * |
7 | * zoned VM statistics | |
8 | * Copyright (C) 2006 Silicon Graphics, Inc., | |
9 | * Christoph Lameter <christoph@lameter.com> | |
f6ac2354 CL |
10 | */ |
11 | ||
f6ac2354 | 12 | #include <linux/mm.h> |
4e950f6f | 13 | #include <linux/err.h> |
2244b95a | 14 | #include <linux/module.h> |
df9ecaba | 15 | #include <linux/cpu.h> |
e8edc6e0 | 16 | #include <linux/sched.h> |
f6ac2354 | 17 | |
f8891e5e CL |
18 | #ifdef CONFIG_VM_EVENT_COUNTERS |
19 | DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}}; | |
20 | EXPORT_PER_CPU_SYMBOL(vm_event_states); | |
21 | ||
22 | static void sum_vm_events(unsigned long *ret, cpumask_t *cpumask) | |
23 | { | |
9eccf2a8 | 24 | int cpu; |
f8891e5e CL |
25 | int i; |
26 | ||
27 | memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long)); | |
28 | ||
9eccf2a8 | 29 | for_each_cpu_mask(cpu, *cpumask) { |
f8891e5e CL |
30 | struct vm_event_state *this = &per_cpu(vm_event_states, cpu); |
31 | ||
f8891e5e CL |
32 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) |
33 | ret[i] += this->event[i]; | |
34 | } | |
35 | } | |
36 | ||
37 | /* | |
38 | * Accumulate the vm event counters across all CPUs. | |
39 | * The result is unavoidably approximate - it can change | |
40 | * during and after execution of this function. | |
41 | */ | |
42 | void all_vm_events(unsigned long *ret) | |
43 | { | |
b5be1132 | 44 | get_online_cpus(); |
f8891e5e | 45 | sum_vm_events(ret, &cpu_online_map); |
b5be1132 | 46 | put_online_cpus(); |
f8891e5e | 47 | } |
32dd66fc | 48 | EXPORT_SYMBOL_GPL(all_vm_events); |
f8891e5e CL |
49 | |
50 | #ifdef CONFIG_HOTPLUG | |
51 | /* | |
52 | * Fold the foreign cpu events into our own. | |
53 | * | |
54 | * This is adding to the events on one processor | |
55 | * but keeps the global counts constant. | |
56 | */ | |
57 | void vm_events_fold_cpu(int cpu) | |
58 | { | |
59 | struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu); | |
60 | int i; | |
61 | ||
62 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) { | |
63 | count_vm_events(i, fold_state->event[i]); | |
64 | fold_state->event[i] = 0; | |
65 | } | |
66 | } | |
67 | #endif /* CONFIG_HOTPLUG */ | |
68 | ||
69 | #endif /* CONFIG_VM_EVENT_COUNTERS */ | |
70 | ||
2244b95a CL |
71 | /* |
72 | * Manage combined zone based / global counters | |
73 | * | |
74 | * vm_stat contains the global counters | |
75 | */ | |
76 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
77 | EXPORT_SYMBOL(vm_stat); | |
78 | ||
79 | #ifdef CONFIG_SMP | |
80 | ||
df9ecaba CL |
81 | static int calculate_threshold(struct zone *zone) |
82 | { | |
83 | int threshold; | |
84 | int mem; /* memory in 128 MB units */ | |
85 | ||
86 | /* | |
87 | * The threshold scales with the number of processors and the amount | |
88 | * of memory per zone. More memory means that we can defer updates for | |
89 | * longer, more processors could lead to more contention. | |
90 | * fls() is used to have a cheap way of logarithmic scaling. | |
91 | * | |
92 | * Some sample thresholds: | |
93 | * | |
94 | * Threshold Processors (fls) Zonesize fls(mem+1) | |
95 | * ------------------------------------------------------------------ | |
96 | * 8 1 1 0.9-1 GB 4 | |
97 | * 16 2 2 0.9-1 GB 4 | |
98 | * 20 2 2 1-2 GB 5 | |
99 | * 24 2 2 2-4 GB 6 | |
100 | * 28 2 2 4-8 GB 7 | |
101 | * 32 2 2 8-16 GB 8 | |
102 | * 4 2 2 <128M 1 | |
103 | * 30 4 3 2-4 GB 5 | |
104 | * 48 4 3 8-16 GB 8 | |
105 | * 32 8 4 1-2 GB 4 | |
106 | * 32 8 4 0.9-1GB 4 | |
107 | * 10 16 5 <128M 1 | |
108 | * 40 16 5 900M 4 | |
109 | * 70 64 7 2-4 GB 5 | |
110 | * 84 64 7 4-8 GB 6 | |
111 | * 108 512 9 4-8 GB 6 | |
112 | * 125 1024 10 8-16 GB 8 | |
113 | * 125 1024 10 16-32 GB 9 | |
114 | */ | |
115 | ||
116 | mem = zone->present_pages >> (27 - PAGE_SHIFT); | |
117 | ||
118 | threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem)); | |
119 | ||
120 | /* | |
121 | * Maximum threshold is 125 | |
122 | */ | |
123 | threshold = min(125, threshold); | |
124 | ||
125 | return threshold; | |
126 | } | |
2244b95a CL |
127 | |
128 | /* | |
df9ecaba | 129 | * Refresh the thresholds for each zone. |
2244b95a | 130 | */ |
df9ecaba | 131 | static void refresh_zone_stat_thresholds(void) |
2244b95a | 132 | { |
df9ecaba CL |
133 | struct zone *zone; |
134 | int cpu; | |
135 | int threshold; | |
136 | ||
137 | for_each_zone(zone) { | |
138 | ||
139 | if (!zone->present_pages) | |
140 | continue; | |
141 | ||
142 | threshold = calculate_threshold(zone); | |
143 | ||
144 | for_each_online_cpu(cpu) | |
145 | zone_pcp(zone, cpu)->stat_threshold = threshold; | |
146 | } | |
2244b95a CL |
147 | } |
148 | ||
149 | /* | |
150 | * For use when we know that interrupts are disabled. | |
151 | */ | |
152 | void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
153 | int delta) | |
154 | { | |
df9ecaba CL |
155 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
156 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
157 | long x; |
158 | ||
2244b95a CL |
159 | x = delta + *p; |
160 | ||
df9ecaba | 161 | if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) { |
2244b95a CL |
162 | zone_page_state_add(x, zone, item); |
163 | x = 0; | |
164 | } | |
2244b95a CL |
165 | *p = x; |
166 | } | |
167 | EXPORT_SYMBOL(__mod_zone_page_state); | |
168 | ||
169 | /* | |
170 | * For an unknown interrupt state | |
171 | */ | |
172 | void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
173 | int delta) | |
174 | { | |
175 | unsigned long flags; | |
176 | ||
177 | local_irq_save(flags); | |
178 | __mod_zone_page_state(zone, item, delta); | |
179 | local_irq_restore(flags); | |
180 | } | |
181 | EXPORT_SYMBOL(mod_zone_page_state); | |
182 | ||
183 | /* | |
184 | * Optimized increment and decrement functions. | |
185 | * | |
186 | * These are only for a single page and therefore can take a struct page * | |
187 | * argument instead of struct zone *. This allows the inclusion of the code | |
188 | * generated for page_zone(page) into the optimized functions. | |
189 | * | |
190 | * No overflow check is necessary and therefore the differential can be | |
191 | * incremented or decremented in place which may allow the compilers to | |
192 | * generate better code. | |
2244b95a CL |
193 | * The increment or decrement is known and therefore one boundary check can |
194 | * be omitted. | |
195 | * | |
df9ecaba CL |
196 | * NOTE: These functions are very performance sensitive. Change only |
197 | * with care. | |
198 | * | |
2244b95a CL |
199 | * Some processors have inc/dec instructions that are atomic vs an interrupt. |
200 | * However, the code must first determine the differential location in a zone | |
201 | * based on the processor number and then inc/dec the counter. There is no | |
202 | * guarantee without disabling preemption that the processor will not change | |
203 | * in between and therefore the atomicity vs. interrupt cannot be exploited | |
204 | * in a useful way here. | |
205 | */ | |
c8785385 | 206 | void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 207 | { |
df9ecaba CL |
208 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
209 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
210 | |
211 | (*p)++; | |
212 | ||
df9ecaba CL |
213 | if (unlikely(*p > pcp->stat_threshold)) { |
214 | int overstep = pcp->stat_threshold / 2; | |
215 | ||
216 | zone_page_state_add(*p + overstep, zone, item); | |
217 | *p = -overstep; | |
2244b95a CL |
218 | } |
219 | } | |
ca889e6c CL |
220 | |
221 | void __inc_zone_page_state(struct page *page, enum zone_stat_item item) | |
222 | { | |
223 | __inc_zone_state(page_zone(page), item); | |
224 | } | |
2244b95a CL |
225 | EXPORT_SYMBOL(__inc_zone_page_state); |
226 | ||
c8785385 | 227 | void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 228 | { |
df9ecaba CL |
229 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
230 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
231 | |
232 | (*p)--; | |
233 | ||
df9ecaba CL |
234 | if (unlikely(*p < - pcp->stat_threshold)) { |
235 | int overstep = pcp->stat_threshold / 2; | |
236 | ||
237 | zone_page_state_add(*p - overstep, zone, item); | |
238 | *p = overstep; | |
2244b95a CL |
239 | } |
240 | } | |
c8785385 CL |
241 | |
242 | void __dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
243 | { | |
244 | __dec_zone_state(page_zone(page), item); | |
245 | } | |
2244b95a CL |
246 | EXPORT_SYMBOL(__dec_zone_page_state); |
247 | ||
ca889e6c CL |
248 | void inc_zone_state(struct zone *zone, enum zone_stat_item item) |
249 | { | |
250 | unsigned long flags; | |
251 | ||
252 | local_irq_save(flags); | |
253 | __inc_zone_state(zone, item); | |
254 | local_irq_restore(flags); | |
255 | } | |
256 | ||
2244b95a CL |
257 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
258 | { | |
259 | unsigned long flags; | |
260 | struct zone *zone; | |
2244b95a CL |
261 | |
262 | zone = page_zone(page); | |
263 | local_irq_save(flags); | |
ca889e6c | 264 | __inc_zone_state(zone, item); |
2244b95a CL |
265 | local_irq_restore(flags); |
266 | } | |
267 | EXPORT_SYMBOL(inc_zone_page_state); | |
268 | ||
269 | void dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
270 | { | |
271 | unsigned long flags; | |
2244b95a | 272 | |
2244b95a | 273 | local_irq_save(flags); |
a302eb4e | 274 | __dec_zone_page_state(page, item); |
2244b95a CL |
275 | local_irq_restore(flags); |
276 | } | |
277 | EXPORT_SYMBOL(dec_zone_page_state); | |
278 | ||
279 | /* | |
280 | * Update the zone counters for one cpu. | |
4037d452 | 281 | * |
a7f75e25 CL |
282 | * The cpu specified must be either the current cpu or a processor that |
283 | * is not online. If it is the current cpu then the execution thread must | |
284 | * be pinned to the current cpu. | |
285 | * | |
4037d452 CL |
286 | * Note that refresh_cpu_vm_stats strives to only access |
287 | * node local memory. The per cpu pagesets on remote zones are placed | |
288 | * in the memory local to the processor using that pageset. So the | |
289 | * loop over all zones will access a series of cachelines local to | |
290 | * the processor. | |
291 | * | |
292 | * The call to zone_page_state_add updates the cachelines with the | |
293 | * statistics in the remote zone struct as well as the global cachelines | |
294 | * with the global counters. These could cause remote node cache line | |
295 | * bouncing and will have to be only done when necessary. | |
2244b95a CL |
296 | */ |
297 | void refresh_cpu_vm_stats(int cpu) | |
298 | { | |
299 | struct zone *zone; | |
300 | int i; | |
a7f75e25 | 301 | int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, }; |
2244b95a CL |
302 | |
303 | for_each_zone(zone) { | |
4037d452 | 304 | struct per_cpu_pageset *p; |
2244b95a | 305 | |
39bbcb8f CL |
306 | if (!populated_zone(zone)) |
307 | continue; | |
308 | ||
4037d452 | 309 | p = zone_pcp(zone, cpu); |
2244b95a CL |
310 | |
311 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
4037d452 | 312 | if (p->vm_stat_diff[i]) { |
a7f75e25 CL |
313 | unsigned long flags; |
314 | int v; | |
315 | ||
2244b95a | 316 | local_irq_save(flags); |
a7f75e25 | 317 | v = p->vm_stat_diff[i]; |
4037d452 | 318 | p->vm_stat_diff[i] = 0; |
a7f75e25 CL |
319 | local_irq_restore(flags); |
320 | atomic_long_add(v, &zone->vm_stat[i]); | |
321 | global_diff[i] += v; | |
4037d452 CL |
322 | #ifdef CONFIG_NUMA |
323 | /* 3 seconds idle till flush */ | |
324 | p->expire = 3; | |
325 | #endif | |
2244b95a | 326 | } |
468fd62e | 327 | cond_resched(); |
4037d452 CL |
328 | #ifdef CONFIG_NUMA |
329 | /* | |
330 | * Deal with draining the remote pageset of this | |
331 | * processor | |
332 | * | |
333 | * Check if there are pages remaining in this pageset | |
334 | * if not then there is nothing to expire. | |
335 | */ | |
3dfa5721 | 336 | if (!p->expire || !p->pcp.count) |
4037d452 CL |
337 | continue; |
338 | ||
339 | /* | |
340 | * We never drain zones local to this processor. | |
341 | */ | |
342 | if (zone_to_nid(zone) == numa_node_id()) { | |
343 | p->expire = 0; | |
344 | continue; | |
345 | } | |
346 | ||
347 | p->expire--; | |
348 | if (p->expire) | |
349 | continue; | |
350 | ||
3dfa5721 CL |
351 | if (p->pcp.count) |
352 | drain_zone_pages(zone, &p->pcp); | |
4037d452 | 353 | #endif |
2244b95a | 354 | } |
a7f75e25 CL |
355 | |
356 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
357 | if (global_diff[i]) | |
358 | atomic_long_add(global_diff[i], &vm_stat[i]); | |
2244b95a CL |
359 | } |
360 | ||
2244b95a CL |
361 | #endif |
362 | ||
ca889e6c CL |
363 | #ifdef CONFIG_NUMA |
364 | /* | |
365 | * zonelist = the list of zones passed to the allocator | |
366 | * z = the zone from which the allocation occurred. | |
367 | * | |
368 | * Must be called with interrupts disabled. | |
369 | */ | |
18ea7e71 | 370 | void zone_statistics(struct zone *preferred_zone, struct zone *z) |
ca889e6c | 371 | { |
18ea7e71 | 372 | if (z->zone_pgdat == preferred_zone->zone_pgdat) { |
ca889e6c CL |
373 | __inc_zone_state(z, NUMA_HIT); |
374 | } else { | |
375 | __inc_zone_state(z, NUMA_MISS); | |
18ea7e71 | 376 | __inc_zone_state(preferred_zone, NUMA_FOREIGN); |
ca889e6c | 377 | } |
5d292343 | 378 | if (z->node == numa_node_id()) |
ca889e6c CL |
379 | __inc_zone_state(z, NUMA_LOCAL); |
380 | else | |
381 | __inc_zone_state(z, NUMA_OTHER); | |
382 | } | |
383 | #endif | |
384 | ||
f6ac2354 CL |
385 | #ifdef CONFIG_PROC_FS |
386 | ||
387 | #include <linux/seq_file.h> | |
388 | ||
467c996c MG |
389 | static char * const migratetype_names[MIGRATE_TYPES] = { |
390 | "Unmovable", | |
391 | "Reclaimable", | |
392 | "Movable", | |
393 | "Reserve", | |
91446b06 | 394 | "Isolate", |
467c996c MG |
395 | }; |
396 | ||
f6ac2354 CL |
397 | static void *frag_start(struct seq_file *m, loff_t *pos) |
398 | { | |
399 | pg_data_t *pgdat; | |
400 | loff_t node = *pos; | |
401 | for (pgdat = first_online_pgdat(); | |
402 | pgdat && node; | |
403 | pgdat = next_online_pgdat(pgdat)) | |
404 | --node; | |
405 | ||
406 | return pgdat; | |
407 | } | |
408 | ||
409 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) | |
410 | { | |
411 | pg_data_t *pgdat = (pg_data_t *)arg; | |
412 | ||
413 | (*pos)++; | |
414 | return next_online_pgdat(pgdat); | |
415 | } | |
416 | ||
417 | static void frag_stop(struct seq_file *m, void *arg) | |
418 | { | |
419 | } | |
420 | ||
467c996c MG |
421 | /* Walk all the zones in a node and print using a callback */ |
422 | static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat, | |
423 | void (*print)(struct seq_file *m, pg_data_t *, struct zone *)) | |
f6ac2354 | 424 | { |
f6ac2354 CL |
425 | struct zone *zone; |
426 | struct zone *node_zones = pgdat->node_zones; | |
427 | unsigned long flags; | |
f6ac2354 CL |
428 | |
429 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { | |
430 | if (!populated_zone(zone)) | |
431 | continue; | |
432 | ||
433 | spin_lock_irqsave(&zone->lock, flags); | |
467c996c | 434 | print(m, pgdat, zone); |
f6ac2354 | 435 | spin_unlock_irqrestore(&zone->lock, flags); |
467c996c MG |
436 | } |
437 | } | |
438 | ||
439 | static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, | |
440 | struct zone *zone) | |
441 | { | |
442 | int order; | |
443 | ||
444 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
445 | for (order = 0; order < MAX_ORDER; ++order) | |
446 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); | |
447 | seq_putc(m, '\n'); | |
448 | } | |
449 | ||
450 | /* | |
451 | * This walks the free areas for each zone. | |
452 | */ | |
453 | static int frag_show(struct seq_file *m, void *arg) | |
454 | { | |
455 | pg_data_t *pgdat = (pg_data_t *)arg; | |
456 | walk_zones_in_node(m, pgdat, frag_show_print); | |
457 | return 0; | |
458 | } | |
459 | ||
460 | static void pagetypeinfo_showfree_print(struct seq_file *m, | |
461 | pg_data_t *pgdat, struct zone *zone) | |
462 | { | |
463 | int order, mtype; | |
464 | ||
465 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) { | |
466 | seq_printf(m, "Node %4d, zone %8s, type %12s ", | |
467 | pgdat->node_id, | |
468 | zone->name, | |
469 | migratetype_names[mtype]); | |
470 | for (order = 0; order < MAX_ORDER; ++order) { | |
471 | unsigned long freecount = 0; | |
472 | struct free_area *area; | |
473 | struct list_head *curr; | |
474 | ||
475 | area = &(zone->free_area[order]); | |
476 | ||
477 | list_for_each(curr, &area->free_list[mtype]) | |
478 | freecount++; | |
479 | seq_printf(m, "%6lu ", freecount); | |
480 | } | |
f6ac2354 CL |
481 | seq_putc(m, '\n'); |
482 | } | |
467c996c MG |
483 | } |
484 | ||
485 | /* Print out the free pages at each order for each migatetype */ | |
486 | static int pagetypeinfo_showfree(struct seq_file *m, void *arg) | |
487 | { | |
488 | int order; | |
489 | pg_data_t *pgdat = (pg_data_t *)arg; | |
490 | ||
491 | /* Print header */ | |
492 | seq_printf(m, "%-43s ", "Free pages count per migrate type at order"); | |
493 | for (order = 0; order < MAX_ORDER; ++order) | |
494 | seq_printf(m, "%6d ", order); | |
495 | seq_putc(m, '\n'); | |
496 | ||
497 | walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print); | |
498 | ||
499 | return 0; | |
500 | } | |
501 | ||
502 | static void pagetypeinfo_showblockcount_print(struct seq_file *m, | |
503 | pg_data_t *pgdat, struct zone *zone) | |
504 | { | |
505 | int mtype; | |
506 | unsigned long pfn; | |
507 | unsigned long start_pfn = zone->zone_start_pfn; | |
508 | unsigned long end_pfn = start_pfn + zone->spanned_pages; | |
509 | unsigned long count[MIGRATE_TYPES] = { 0, }; | |
510 | ||
511 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { | |
512 | struct page *page; | |
513 | ||
514 | if (!pfn_valid(pfn)) | |
515 | continue; | |
516 | ||
517 | page = pfn_to_page(pfn); | |
518 | mtype = get_pageblock_migratetype(page); | |
519 | ||
520 | count[mtype]++; | |
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 | ||
15ad7cdc | 566 | 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 | ||
467c996c MG |
573 | const struct seq_operations pagetypeinfo_op = { |
574 | .start = frag_start, | |
575 | .next = frag_next, | |
576 | .stop = frag_stop, | |
577 | .show = pagetypeinfo_show, | |
578 | }; | |
579 | ||
4b51d669 CL |
580 | #ifdef CONFIG_ZONE_DMA |
581 | #define TEXT_FOR_DMA(xx) xx "_dma", | |
582 | #else | |
583 | #define TEXT_FOR_DMA(xx) | |
584 | #endif | |
585 | ||
27bf71c2 CL |
586 | #ifdef CONFIG_ZONE_DMA32 |
587 | #define TEXT_FOR_DMA32(xx) xx "_dma32", | |
588 | #else | |
589 | #define TEXT_FOR_DMA32(xx) | |
590 | #endif | |
591 | ||
592 | #ifdef CONFIG_HIGHMEM | |
593 | #define TEXT_FOR_HIGHMEM(xx) xx "_high", | |
594 | #else | |
595 | #define TEXT_FOR_HIGHMEM(xx) | |
596 | #endif | |
597 | ||
4b51d669 | 598 | #define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \ |
2a1e274a | 599 | TEXT_FOR_HIGHMEM(xx) xx "_movable", |
27bf71c2 | 600 | |
15ad7cdc | 601 | static const char * const vmstat_text[] = { |
2244b95a | 602 | /* Zoned VM counters */ |
d23ad423 | 603 | "nr_free_pages", |
c8785385 | 604 | "nr_inactive", |
23c1fb52 | 605 | "nr_active", |
f3dbd344 | 606 | "nr_anon_pages", |
65ba55f5 | 607 | "nr_mapped", |
347ce434 | 608 | "nr_file_pages", |
51ed4491 CL |
609 | "nr_dirty", |
610 | "nr_writeback", | |
972d1a7b CL |
611 | "nr_slab_reclaimable", |
612 | "nr_slab_unreclaimable", | |
df849a15 | 613 | "nr_page_table_pages", |
f6ac2354 | 614 | "nr_unstable", |
d2c5e30c | 615 | "nr_bounce", |
e129b5c2 | 616 | "nr_vmscan_write", |
fc3ba692 | 617 | "nr_writeback_temp", |
f6ac2354 | 618 | |
ca889e6c CL |
619 | #ifdef CONFIG_NUMA |
620 | "numa_hit", | |
621 | "numa_miss", | |
622 | "numa_foreign", | |
623 | "numa_interleave", | |
624 | "numa_local", | |
625 | "numa_other", | |
626 | #endif | |
627 | ||
f8891e5e | 628 | #ifdef CONFIG_VM_EVENT_COUNTERS |
f6ac2354 CL |
629 | "pgpgin", |
630 | "pgpgout", | |
631 | "pswpin", | |
632 | "pswpout", | |
633 | ||
27bf71c2 | 634 | TEXTS_FOR_ZONES("pgalloc") |
f6ac2354 CL |
635 | |
636 | "pgfree", | |
637 | "pgactivate", | |
638 | "pgdeactivate", | |
639 | ||
640 | "pgfault", | |
641 | "pgmajfault", | |
642 | ||
27bf71c2 CL |
643 | TEXTS_FOR_ZONES("pgrefill") |
644 | TEXTS_FOR_ZONES("pgsteal") | |
645 | TEXTS_FOR_ZONES("pgscan_kswapd") | |
646 | TEXTS_FOR_ZONES("pgscan_direct") | |
f6ac2354 CL |
647 | |
648 | "pginodesteal", | |
649 | "slabs_scanned", | |
650 | "kswapd_steal", | |
651 | "kswapd_inodesteal", | |
652 | "pageoutrun", | |
653 | "allocstall", | |
654 | ||
655 | "pgrotated", | |
3b116300 AL |
656 | #ifdef CONFIG_HUGETLB_PAGE |
657 | "htlb_buddy_alloc_success", | |
658 | "htlb_buddy_alloc_fail", | |
659 | #endif | |
f8891e5e | 660 | #endif |
f6ac2354 CL |
661 | }; |
662 | ||
467c996c MG |
663 | static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, |
664 | struct zone *zone) | |
f6ac2354 | 665 | { |
467c996c MG |
666 | int i; |
667 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); | |
668 | seq_printf(m, | |
669 | "\n pages free %lu" | |
670 | "\n min %lu" | |
671 | "\n low %lu" | |
672 | "\n high %lu" | |
673 | "\n scanned %lu (a: %lu i: %lu)" | |
674 | "\n spanned %lu" | |
675 | "\n present %lu", | |
676 | zone_page_state(zone, NR_FREE_PAGES), | |
677 | zone->pages_min, | |
678 | zone->pages_low, | |
679 | zone->pages_high, | |
680 | zone->pages_scanned, | |
681 | zone->nr_scan_active, zone->nr_scan_inactive, | |
682 | zone->spanned_pages, | |
683 | zone->present_pages); | |
684 | ||
685 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
686 | seq_printf(m, "\n %-12s %lu", vmstat_text[i], | |
687 | zone_page_state(zone, i)); | |
688 | ||
689 | seq_printf(m, | |
690 | "\n protection: (%lu", | |
691 | zone->lowmem_reserve[0]); | |
692 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) | |
693 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); | |
694 | seq_printf(m, | |
695 | ")" | |
696 | "\n pagesets"); | |
697 | for_each_online_cpu(i) { | |
698 | struct per_cpu_pageset *pageset; | |
467c996c MG |
699 | |
700 | pageset = zone_pcp(zone, i); | |
3dfa5721 CL |
701 | seq_printf(m, |
702 | "\n cpu: %i" | |
703 | "\n count: %i" | |
704 | "\n high: %i" | |
705 | "\n batch: %i", | |
706 | i, | |
707 | pageset->pcp.count, | |
708 | pageset->pcp.high, | |
709 | pageset->pcp.batch); | |
df9ecaba | 710 | #ifdef CONFIG_SMP |
467c996c MG |
711 | seq_printf(m, "\n vm stats threshold: %d", |
712 | pageset->stat_threshold); | |
df9ecaba | 713 | #endif |
f6ac2354 | 714 | } |
467c996c MG |
715 | seq_printf(m, |
716 | "\n all_unreclaimable: %u" | |
717 | "\n prev_priority: %i" | |
718 | "\n start_pfn: %lu", | |
e815af95 | 719 | zone_is_all_unreclaimable(zone), |
467c996c MG |
720 | zone->prev_priority, |
721 | zone->zone_start_pfn); | |
722 | seq_putc(m, '\n'); | |
723 | } | |
724 | ||
725 | /* | |
726 | * Output information about zones in @pgdat. | |
727 | */ | |
728 | static int zoneinfo_show(struct seq_file *m, void *arg) | |
729 | { | |
730 | pg_data_t *pgdat = (pg_data_t *)arg; | |
731 | walk_zones_in_node(m, pgdat, zoneinfo_show_print); | |
f6ac2354 CL |
732 | return 0; |
733 | } | |
734 | ||
15ad7cdc | 735 | const struct seq_operations zoneinfo_op = { |
f6ac2354 CL |
736 | .start = frag_start, /* iterate over all zones. The same as in |
737 | * fragmentation. */ | |
738 | .next = frag_next, | |
739 | .stop = frag_stop, | |
740 | .show = zoneinfo_show, | |
741 | }; | |
742 | ||
743 | static void *vmstat_start(struct seq_file *m, loff_t *pos) | |
744 | { | |
2244b95a | 745 | unsigned long *v; |
f8891e5e CL |
746 | #ifdef CONFIG_VM_EVENT_COUNTERS |
747 | unsigned long *e; | |
748 | #endif | |
2244b95a | 749 | int i; |
f6ac2354 CL |
750 | |
751 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
752 | return NULL; | |
753 | ||
f8891e5e | 754 | #ifdef CONFIG_VM_EVENT_COUNTERS |
2244b95a | 755 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) |
f8891e5e CL |
756 | + sizeof(struct vm_event_state), GFP_KERNEL); |
757 | #else | |
758 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long), | |
759 | GFP_KERNEL); | |
760 | #endif | |
2244b95a CL |
761 | m->private = v; |
762 | if (!v) | |
f6ac2354 | 763 | return ERR_PTR(-ENOMEM); |
2244b95a CL |
764 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
765 | v[i] = global_page_state(i); | |
f8891e5e CL |
766 | #ifdef CONFIG_VM_EVENT_COUNTERS |
767 | e = v + NR_VM_ZONE_STAT_ITEMS; | |
768 | all_vm_events(e); | |
769 | e[PGPGIN] /= 2; /* sectors -> kbytes */ | |
770 | e[PGPGOUT] /= 2; | |
771 | #endif | |
2244b95a | 772 | return v + *pos; |
f6ac2354 CL |
773 | } |
774 | ||
775 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) | |
776 | { | |
777 | (*pos)++; | |
778 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
779 | return NULL; | |
780 | return (unsigned long *)m->private + *pos; | |
781 | } | |
782 | ||
783 | static int vmstat_show(struct seq_file *m, void *arg) | |
784 | { | |
785 | unsigned long *l = arg; | |
786 | unsigned long off = l - (unsigned long *)m->private; | |
787 | ||
788 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); | |
789 | return 0; | |
790 | } | |
791 | ||
792 | static void vmstat_stop(struct seq_file *m, void *arg) | |
793 | { | |
794 | kfree(m->private); | |
795 | m->private = NULL; | |
796 | } | |
797 | ||
15ad7cdc | 798 | const struct seq_operations vmstat_op = { |
f6ac2354 CL |
799 | .start = vmstat_start, |
800 | .next = vmstat_next, | |
801 | .stop = vmstat_stop, | |
802 | .show = vmstat_show, | |
803 | }; | |
804 | ||
805 | #endif /* CONFIG_PROC_FS */ | |
806 | ||
df9ecaba | 807 | #ifdef CONFIG_SMP |
d1187ed2 | 808 | static DEFINE_PER_CPU(struct delayed_work, vmstat_work); |
77461ab3 | 809 | int sysctl_stat_interval __read_mostly = HZ; |
d1187ed2 CL |
810 | |
811 | static void vmstat_update(struct work_struct *w) | |
812 | { | |
813 | refresh_cpu_vm_stats(smp_processor_id()); | |
77461ab3 CL |
814 | schedule_delayed_work(&__get_cpu_var(vmstat_work), |
815 | sysctl_stat_interval); | |
d1187ed2 CL |
816 | } |
817 | ||
42614fcd | 818 | static void __cpuinit start_cpu_timer(int cpu) |
d1187ed2 CL |
819 | { |
820 | struct delayed_work *vmstat_work = &per_cpu(vmstat_work, cpu); | |
821 | ||
39bf6270 | 822 | INIT_DELAYED_WORK_DEFERRABLE(vmstat_work, vmstat_update); |
d1187ed2 CL |
823 | schedule_delayed_work_on(cpu, vmstat_work, HZ + cpu); |
824 | } | |
825 | ||
df9ecaba CL |
826 | /* |
827 | * Use the cpu notifier to insure that the thresholds are recalculated | |
828 | * when necessary. | |
829 | */ | |
830 | static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb, | |
831 | unsigned long action, | |
832 | void *hcpu) | |
833 | { | |
d1187ed2 CL |
834 | long cpu = (long)hcpu; |
835 | ||
df9ecaba | 836 | switch (action) { |
d1187ed2 CL |
837 | case CPU_ONLINE: |
838 | case CPU_ONLINE_FROZEN: | |
839 | start_cpu_timer(cpu); | |
840 | break; | |
841 | case CPU_DOWN_PREPARE: | |
842 | case CPU_DOWN_PREPARE_FROZEN: | |
843 | cancel_rearming_delayed_work(&per_cpu(vmstat_work, cpu)); | |
844 | per_cpu(vmstat_work, cpu).work.func = NULL; | |
845 | break; | |
846 | case CPU_DOWN_FAILED: | |
847 | case CPU_DOWN_FAILED_FROZEN: | |
848 | start_cpu_timer(cpu); | |
849 | break; | |
ce421c79 | 850 | case CPU_DEAD: |
8bb78442 | 851 | case CPU_DEAD_FROZEN: |
ce421c79 AW |
852 | refresh_zone_stat_thresholds(); |
853 | break; | |
854 | default: | |
855 | break; | |
df9ecaba CL |
856 | } |
857 | return NOTIFY_OK; | |
858 | } | |
859 | ||
860 | static struct notifier_block __cpuinitdata vmstat_notifier = | |
861 | { &vmstat_cpuup_callback, NULL, 0 }; | |
862 | ||
e2fc88d0 | 863 | static int __init setup_vmstat(void) |
df9ecaba | 864 | { |
d1187ed2 CL |
865 | int cpu; |
866 | ||
df9ecaba CL |
867 | refresh_zone_stat_thresholds(); |
868 | register_cpu_notifier(&vmstat_notifier); | |
d1187ed2 CL |
869 | |
870 | for_each_online_cpu(cpu) | |
871 | start_cpu_timer(cpu); | |
df9ecaba CL |
872 | return 0; |
873 | } | |
874 | module_init(setup_vmstat) | |
875 | #endif |