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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 | { | |
44 | sum_vm_events(ret, &cpu_online_map); | |
45 | } | |
32dd66fc | 46 | EXPORT_SYMBOL_GPL(all_vm_events); |
f8891e5e CL |
47 | |
48 | #ifdef CONFIG_HOTPLUG | |
49 | /* | |
50 | * Fold the foreign cpu events into our own. | |
51 | * | |
52 | * This is adding to the events on one processor | |
53 | * but keeps the global counts constant. | |
54 | */ | |
55 | void vm_events_fold_cpu(int cpu) | |
56 | { | |
57 | struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu); | |
58 | int i; | |
59 | ||
60 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) { | |
61 | count_vm_events(i, fold_state->event[i]); | |
62 | fold_state->event[i] = 0; | |
63 | } | |
64 | } | |
65 | #endif /* CONFIG_HOTPLUG */ | |
66 | ||
67 | #endif /* CONFIG_VM_EVENT_COUNTERS */ | |
68 | ||
2244b95a CL |
69 | /* |
70 | * Manage combined zone based / global counters | |
71 | * | |
72 | * vm_stat contains the global counters | |
73 | */ | |
74 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
75 | EXPORT_SYMBOL(vm_stat); | |
76 | ||
77 | #ifdef CONFIG_SMP | |
78 | ||
df9ecaba CL |
79 | static int calculate_threshold(struct zone *zone) |
80 | { | |
81 | int threshold; | |
82 | int mem; /* memory in 128 MB units */ | |
83 | ||
84 | /* | |
85 | * The threshold scales with the number of processors and the amount | |
86 | * of memory per zone. More memory means that we can defer updates for | |
87 | * longer, more processors could lead to more contention. | |
88 | * fls() is used to have a cheap way of logarithmic scaling. | |
89 | * | |
90 | * Some sample thresholds: | |
91 | * | |
92 | * Threshold Processors (fls) Zonesize fls(mem+1) | |
93 | * ------------------------------------------------------------------ | |
94 | * 8 1 1 0.9-1 GB 4 | |
95 | * 16 2 2 0.9-1 GB 4 | |
96 | * 20 2 2 1-2 GB 5 | |
97 | * 24 2 2 2-4 GB 6 | |
98 | * 28 2 2 4-8 GB 7 | |
99 | * 32 2 2 8-16 GB 8 | |
100 | * 4 2 2 <128M 1 | |
101 | * 30 4 3 2-4 GB 5 | |
102 | * 48 4 3 8-16 GB 8 | |
103 | * 32 8 4 1-2 GB 4 | |
104 | * 32 8 4 0.9-1GB 4 | |
105 | * 10 16 5 <128M 1 | |
106 | * 40 16 5 900M 4 | |
107 | * 70 64 7 2-4 GB 5 | |
108 | * 84 64 7 4-8 GB 6 | |
109 | * 108 512 9 4-8 GB 6 | |
110 | * 125 1024 10 8-16 GB 8 | |
111 | * 125 1024 10 16-32 GB 9 | |
112 | */ | |
113 | ||
114 | mem = zone->present_pages >> (27 - PAGE_SHIFT); | |
115 | ||
116 | threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem)); | |
117 | ||
118 | /* | |
119 | * Maximum threshold is 125 | |
120 | */ | |
121 | threshold = min(125, threshold); | |
122 | ||
123 | return threshold; | |
124 | } | |
2244b95a CL |
125 | |
126 | /* | |
df9ecaba | 127 | * Refresh the thresholds for each zone. |
2244b95a | 128 | */ |
df9ecaba | 129 | static void refresh_zone_stat_thresholds(void) |
2244b95a | 130 | { |
df9ecaba CL |
131 | struct zone *zone; |
132 | int cpu; | |
133 | int threshold; | |
134 | ||
135 | for_each_zone(zone) { | |
136 | ||
137 | if (!zone->present_pages) | |
138 | continue; | |
139 | ||
140 | threshold = calculate_threshold(zone); | |
141 | ||
142 | for_each_online_cpu(cpu) | |
143 | zone_pcp(zone, cpu)->stat_threshold = threshold; | |
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 | { | |
df9ecaba CL |
153 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
154 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
155 | long x; |
156 | ||
2244b95a CL |
157 | x = delta + *p; |
158 | ||
df9ecaba | 159 | if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) { |
2244b95a CL |
160 | zone_page_state_add(x, zone, item); |
161 | x = 0; | |
162 | } | |
2244b95a CL |
163 | *p = x; |
164 | } | |
165 | EXPORT_SYMBOL(__mod_zone_page_state); | |
166 | ||
167 | /* | |
168 | * For an unknown interrupt state | |
169 | */ | |
170 | void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
171 | int delta) | |
172 | { | |
173 | unsigned long flags; | |
174 | ||
175 | local_irq_save(flags); | |
176 | __mod_zone_page_state(zone, item, delta); | |
177 | local_irq_restore(flags); | |
178 | } | |
179 | EXPORT_SYMBOL(mod_zone_page_state); | |
180 | ||
181 | /* | |
182 | * Optimized increment and decrement functions. | |
183 | * | |
184 | * These are only for a single page and therefore can take a struct page * | |
185 | * argument instead of struct zone *. This allows the inclusion of the code | |
186 | * generated for page_zone(page) into the optimized functions. | |
187 | * | |
188 | * No overflow check is necessary and therefore the differential can be | |
189 | * incremented or decremented in place which may allow the compilers to | |
190 | * generate better code. | |
2244b95a CL |
191 | * The increment or decrement is known and therefore one boundary check can |
192 | * be omitted. | |
193 | * | |
df9ecaba CL |
194 | * NOTE: These functions are very performance sensitive. Change only |
195 | * with care. | |
196 | * | |
2244b95a CL |
197 | * Some processors have inc/dec instructions that are atomic vs an interrupt. |
198 | * However, the code must first determine the differential location in a zone | |
199 | * based on the processor number and then inc/dec the counter. There is no | |
200 | * guarantee without disabling preemption that the processor will not change | |
201 | * in between and therefore the atomicity vs. interrupt cannot be exploited | |
202 | * in a useful way here. | |
203 | */ | |
c8785385 | 204 | void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 205 | { |
df9ecaba CL |
206 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
207 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
208 | |
209 | (*p)++; | |
210 | ||
df9ecaba CL |
211 | if (unlikely(*p > pcp->stat_threshold)) { |
212 | int overstep = pcp->stat_threshold / 2; | |
213 | ||
214 | zone_page_state_add(*p + overstep, zone, item); | |
215 | *p = -overstep; | |
2244b95a CL |
216 | } |
217 | } | |
ca889e6c CL |
218 | |
219 | void __inc_zone_page_state(struct page *page, enum zone_stat_item item) | |
220 | { | |
221 | __inc_zone_state(page_zone(page), item); | |
222 | } | |
2244b95a CL |
223 | EXPORT_SYMBOL(__inc_zone_page_state); |
224 | ||
c8785385 | 225 | void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 226 | { |
df9ecaba CL |
227 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
228 | s8 *p = pcp->vm_stat_diff + item; | |
2244b95a CL |
229 | |
230 | (*p)--; | |
231 | ||
df9ecaba CL |
232 | if (unlikely(*p < - pcp->stat_threshold)) { |
233 | int overstep = pcp->stat_threshold / 2; | |
234 | ||
235 | zone_page_state_add(*p - overstep, zone, item); | |
236 | *p = overstep; | |
2244b95a CL |
237 | } |
238 | } | |
c8785385 CL |
239 | |
240 | void __dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
241 | { | |
242 | __dec_zone_state(page_zone(page), item); | |
243 | } | |
2244b95a CL |
244 | EXPORT_SYMBOL(__dec_zone_page_state); |
245 | ||
ca889e6c CL |
246 | void inc_zone_state(struct zone *zone, enum zone_stat_item item) |
247 | { | |
248 | unsigned long flags; | |
249 | ||
250 | local_irq_save(flags); | |
251 | __inc_zone_state(zone, item); | |
252 | local_irq_restore(flags); | |
253 | } | |
254 | ||
2244b95a CL |
255 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
256 | { | |
257 | unsigned long flags; | |
258 | struct zone *zone; | |
2244b95a CL |
259 | |
260 | zone = page_zone(page); | |
261 | local_irq_save(flags); | |
ca889e6c | 262 | __inc_zone_state(zone, item); |
2244b95a CL |
263 | local_irq_restore(flags); |
264 | } | |
265 | EXPORT_SYMBOL(inc_zone_page_state); | |
266 | ||
267 | void dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
268 | { | |
269 | unsigned long flags; | |
2244b95a | 270 | |
2244b95a | 271 | local_irq_save(flags); |
a302eb4e | 272 | __dec_zone_page_state(page, item); |
2244b95a CL |
273 | local_irq_restore(flags); |
274 | } | |
275 | EXPORT_SYMBOL(dec_zone_page_state); | |
276 | ||
277 | /* | |
278 | * Update the zone counters for one cpu. | |
4037d452 | 279 | * |
a7f75e25 CL |
280 | * The cpu specified must be either the current cpu or a processor that |
281 | * is not online. If it is the current cpu then the execution thread must | |
282 | * be pinned to the current cpu. | |
283 | * | |
4037d452 CL |
284 | * Note that refresh_cpu_vm_stats strives to only access |
285 | * node local memory. The per cpu pagesets on remote zones are placed | |
286 | * in the memory local to the processor using that pageset. So the | |
287 | * loop over all zones will access a series of cachelines local to | |
288 | * the processor. | |
289 | * | |
290 | * The call to zone_page_state_add updates the cachelines with the | |
291 | * statistics in the remote zone struct as well as the global cachelines | |
292 | * with the global counters. These could cause remote node cache line | |
293 | * bouncing and will have to be only done when necessary. | |
2244b95a CL |
294 | */ |
295 | void refresh_cpu_vm_stats(int cpu) | |
296 | { | |
297 | struct zone *zone; | |
298 | int i; | |
a7f75e25 | 299 | int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, }; |
2244b95a CL |
300 | |
301 | for_each_zone(zone) { | |
4037d452 | 302 | struct per_cpu_pageset *p; |
2244b95a | 303 | |
39bbcb8f CL |
304 | if (!populated_zone(zone)) |
305 | continue; | |
306 | ||
4037d452 | 307 | p = zone_pcp(zone, cpu); |
2244b95a CL |
308 | |
309 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
4037d452 | 310 | if (p->vm_stat_diff[i]) { |
a7f75e25 CL |
311 | unsigned long flags; |
312 | int v; | |
313 | ||
2244b95a | 314 | local_irq_save(flags); |
a7f75e25 | 315 | v = p->vm_stat_diff[i]; |
4037d452 | 316 | p->vm_stat_diff[i] = 0; |
a7f75e25 CL |
317 | local_irq_restore(flags); |
318 | atomic_long_add(v, &zone->vm_stat[i]); | |
319 | global_diff[i] += v; | |
4037d452 CL |
320 | #ifdef CONFIG_NUMA |
321 | /* 3 seconds idle till flush */ | |
322 | p->expire = 3; | |
323 | #endif | |
2244b95a | 324 | } |
468fd62e | 325 | cond_resched(); |
4037d452 CL |
326 | #ifdef CONFIG_NUMA |
327 | /* | |
328 | * Deal with draining the remote pageset of this | |
329 | * processor | |
330 | * | |
331 | * Check if there are pages remaining in this pageset | |
332 | * if not then there is nothing to expire. | |
333 | */ | |
3dfa5721 | 334 | if (!p->expire || !p->pcp.count) |
4037d452 CL |
335 | continue; |
336 | ||
337 | /* | |
338 | * We never drain zones local to this processor. | |
339 | */ | |
340 | if (zone_to_nid(zone) == numa_node_id()) { | |
341 | p->expire = 0; | |
342 | continue; | |
343 | } | |
344 | ||
345 | p->expire--; | |
346 | if (p->expire) | |
347 | continue; | |
348 | ||
3dfa5721 CL |
349 | if (p->pcp.count) |
350 | drain_zone_pages(zone, &p->pcp); | |
4037d452 | 351 | #endif |
2244b95a | 352 | } |
a7f75e25 CL |
353 | |
354 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
355 | if (global_diff[i]) | |
356 | atomic_long_add(global_diff[i], &vm_stat[i]); | |
2244b95a CL |
357 | } |
358 | ||
2244b95a CL |
359 | #endif |
360 | ||
ca889e6c CL |
361 | #ifdef CONFIG_NUMA |
362 | /* | |
363 | * zonelist = the list of zones passed to the allocator | |
364 | * z = the zone from which the allocation occurred. | |
365 | * | |
366 | * Must be called with interrupts disabled. | |
367 | */ | |
18ea7e71 | 368 | void zone_statistics(struct zone *preferred_zone, struct zone *z) |
ca889e6c | 369 | { |
18ea7e71 | 370 | if (z->zone_pgdat == preferred_zone->zone_pgdat) { |
ca889e6c CL |
371 | __inc_zone_state(z, NUMA_HIT); |
372 | } else { | |
373 | __inc_zone_state(z, NUMA_MISS); | |
18ea7e71 | 374 | __inc_zone_state(preferred_zone, NUMA_FOREIGN); |
ca889e6c | 375 | } |
5d292343 | 376 | if (z->node == numa_node_id()) |
ca889e6c CL |
377 | __inc_zone_state(z, NUMA_LOCAL); |
378 | else | |
379 | __inc_zone_state(z, NUMA_OTHER); | |
380 | } | |
381 | #endif | |
382 | ||
f6ac2354 CL |
383 | #ifdef CONFIG_PROC_FS |
384 | ||
385 | #include <linux/seq_file.h> | |
386 | ||
467c996c MG |
387 | static char * const migratetype_names[MIGRATE_TYPES] = { |
388 | "Unmovable", | |
389 | "Reclaimable", | |
390 | "Movable", | |
391 | "Reserve", | |
91446b06 | 392 | "Isolate", |
467c996c MG |
393 | }; |
394 | ||
f6ac2354 CL |
395 | static void *frag_start(struct seq_file *m, loff_t *pos) |
396 | { | |
397 | pg_data_t *pgdat; | |
398 | loff_t node = *pos; | |
399 | for (pgdat = first_online_pgdat(); | |
400 | pgdat && node; | |
401 | pgdat = next_online_pgdat(pgdat)) | |
402 | --node; | |
403 | ||
404 | return pgdat; | |
405 | } | |
406 | ||
407 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) | |
408 | { | |
409 | pg_data_t *pgdat = (pg_data_t *)arg; | |
410 | ||
411 | (*pos)++; | |
412 | return next_online_pgdat(pgdat); | |
413 | } | |
414 | ||
415 | static void frag_stop(struct seq_file *m, void *arg) | |
416 | { | |
417 | } | |
418 | ||
467c996c MG |
419 | /* Walk all the zones in a node and print using a callback */ |
420 | static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat, | |
421 | void (*print)(struct seq_file *m, pg_data_t *, struct zone *)) | |
f6ac2354 | 422 | { |
f6ac2354 CL |
423 | struct zone *zone; |
424 | struct zone *node_zones = pgdat->node_zones; | |
425 | unsigned long flags; | |
f6ac2354 CL |
426 | |
427 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { | |
428 | if (!populated_zone(zone)) | |
429 | continue; | |
430 | ||
431 | spin_lock_irqsave(&zone->lock, flags); | |
467c996c | 432 | print(m, pgdat, zone); |
f6ac2354 | 433 | spin_unlock_irqrestore(&zone->lock, flags); |
467c996c MG |
434 | } |
435 | } | |
436 | ||
437 | static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, | |
438 | struct zone *zone) | |
439 | { | |
440 | int order; | |
441 | ||
442 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
443 | for (order = 0; order < MAX_ORDER; ++order) | |
444 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); | |
445 | seq_putc(m, '\n'); | |
446 | } | |
447 | ||
448 | /* | |
449 | * This walks the free areas for each zone. | |
450 | */ | |
451 | static int frag_show(struct seq_file *m, void *arg) | |
452 | { | |
453 | pg_data_t *pgdat = (pg_data_t *)arg; | |
454 | walk_zones_in_node(m, pgdat, frag_show_print); | |
455 | return 0; | |
456 | } | |
457 | ||
458 | static void pagetypeinfo_showfree_print(struct seq_file *m, | |
459 | pg_data_t *pgdat, struct zone *zone) | |
460 | { | |
461 | int order, mtype; | |
462 | ||
463 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) { | |
464 | seq_printf(m, "Node %4d, zone %8s, type %12s ", | |
465 | pgdat->node_id, | |
466 | zone->name, | |
467 | migratetype_names[mtype]); | |
468 | for (order = 0; order < MAX_ORDER; ++order) { | |
469 | unsigned long freecount = 0; | |
470 | struct free_area *area; | |
471 | struct list_head *curr; | |
472 | ||
473 | area = &(zone->free_area[order]); | |
474 | ||
475 | list_for_each(curr, &area->free_list[mtype]) | |
476 | freecount++; | |
477 | seq_printf(m, "%6lu ", freecount); | |
478 | } | |
f6ac2354 CL |
479 | seq_putc(m, '\n'); |
480 | } | |
467c996c MG |
481 | } |
482 | ||
483 | /* Print out the free pages at each order for each migatetype */ | |
484 | static int pagetypeinfo_showfree(struct seq_file *m, void *arg) | |
485 | { | |
486 | int order; | |
487 | pg_data_t *pgdat = (pg_data_t *)arg; | |
488 | ||
489 | /* Print header */ | |
490 | seq_printf(m, "%-43s ", "Free pages count per migrate type at order"); | |
491 | for (order = 0; order < MAX_ORDER; ++order) | |
492 | seq_printf(m, "%6d ", order); | |
493 | seq_putc(m, '\n'); | |
494 | ||
495 | walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print); | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | static void pagetypeinfo_showblockcount_print(struct seq_file *m, | |
501 | pg_data_t *pgdat, struct zone *zone) | |
502 | { | |
503 | int mtype; | |
504 | unsigned long pfn; | |
505 | unsigned long start_pfn = zone->zone_start_pfn; | |
506 | unsigned long end_pfn = start_pfn + zone->spanned_pages; | |
507 | unsigned long count[MIGRATE_TYPES] = { 0, }; | |
508 | ||
509 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { | |
510 | struct page *page; | |
511 | ||
512 | if (!pfn_valid(pfn)) | |
513 | continue; | |
514 | ||
515 | page = pfn_to_page(pfn); | |
516 | mtype = get_pageblock_migratetype(page); | |
517 | ||
518 | count[mtype]++; | |
519 | } | |
520 | ||
521 | /* Print counts */ | |
522 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
523 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) | |
524 | seq_printf(m, "%12lu ", count[mtype]); | |
525 | seq_putc(m, '\n'); | |
526 | } | |
527 | ||
528 | /* Print out the free pages at each order for each migratetype */ | |
529 | static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg) | |
530 | { | |
531 | int mtype; | |
532 | pg_data_t *pgdat = (pg_data_t *)arg; | |
533 | ||
534 | seq_printf(m, "\n%-23s", "Number of blocks type "); | |
535 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) | |
536 | seq_printf(m, "%12s ", migratetype_names[mtype]); | |
537 | seq_putc(m, '\n'); | |
538 | walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print); | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | /* | |
544 | * This prints out statistics in relation to grouping pages by mobility. | |
545 | * It is expensive to collect so do not constantly read the file. | |
546 | */ | |
547 | static int pagetypeinfo_show(struct seq_file *m, void *arg) | |
548 | { | |
549 | pg_data_t *pgdat = (pg_data_t *)arg; | |
550 | ||
41b25a37 KM |
551 | /* check memoryless node */ |
552 | if (!node_state(pgdat->node_id, N_HIGH_MEMORY)) | |
553 | return 0; | |
554 | ||
467c996c MG |
555 | seq_printf(m, "Page block order: %d\n", pageblock_order); |
556 | seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages); | |
557 | seq_putc(m, '\n'); | |
558 | pagetypeinfo_showfree(m, pgdat); | |
559 | pagetypeinfo_showblockcount(m, pgdat); | |
560 | ||
f6ac2354 CL |
561 | return 0; |
562 | } | |
563 | ||
15ad7cdc | 564 | const struct seq_operations fragmentation_op = { |
f6ac2354 CL |
565 | .start = frag_start, |
566 | .next = frag_next, | |
567 | .stop = frag_stop, | |
568 | .show = frag_show, | |
569 | }; | |
570 | ||
467c996c MG |
571 | const struct seq_operations pagetypeinfo_op = { |
572 | .start = frag_start, | |
573 | .next = frag_next, | |
574 | .stop = frag_stop, | |
575 | .show = pagetypeinfo_show, | |
576 | }; | |
577 | ||
4b51d669 CL |
578 | #ifdef CONFIG_ZONE_DMA |
579 | #define TEXT_FOR_DMA(xx) xx "_dma", | |
580 | #else | |
581 | #define TEXT_FOR_DMA(xx) | |
582 | #endif | |
583 | ||
27bf71c2 CL |
584 | #ifdef CONFIG_ZONE_DMA32 |
585 | #define TEXT_FOR_DMA32(xx) xx "_dma32", | |
586 | #else | |
587 | #define TEXT_FOR_DMA32(xx) | |
588 | #endif | |
589 | ||
590 | #ifdef CONFIG_HIGHMEM | |
591 | #define TEXT_FOR_HIGHMEM(xx) xx "_high", | |
592 | #else | |
593 | #define TEXT_FOR_HIGHMEM(xx) | |
594 | #endif | |
595 | ||
4b51d669 | 596 | #define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \ |
2a1e274a | 597 | TEXT_FOR_HIGHMEM(xx) xx "_movable", |
27bf71c2 | 598 | |
15ad7cdc | 599 | static const char * const vmstat_text[] = { |
2244b95a | 600 | /* Zoned VM counters */ |
d23ad423 | 601 | "nr_free_pages", |
c8785385 | 602 | "nr_inactive", |
23c1fb52 | 603 | "nr_active", |
f3dbd344 | 604 | "nr_anon_pages", |
65ba55f5 | 605 | "nr_mapped", |
347ce434 | 606 | "nr_file_pages", |
51ed4491 CL |
607 | "nr_dirty", |
608 | "nr_writeback", | |
972d1a7b CL |
609 | "nr_slab_reclaimable", |
610 | "nr_slab_unreclaimable", | |
df849a15 | 611 | "nr_page_table_pages", |
f6ac2354 | 612 | "nr_unstable", |
d2c5e30c | 613 | "nr_bounce", |
e129b5c2 | 614 | "nr_vmscan_write", |
f6ac2354 | 615 | |
ca889e6c CL |
616 | #ifdef CONFIG_NUMA |
617 | "numa_hit", | |
618 | "numa_miss", | |
619 | "numa_foreign", | |
620 | "numa_interleave", | |
621 | "numa_local", | |
622 | "numa_other", | |
623 | #endif | |
624 | ||
f8891e5e | 625 | #ifdef CONFIG_VM_EVENT_COUNTERS |
f6ac2354 CL |
626 | "pgpgin", |
627 | "pgpgout", | |
628 | "pswpin", | |
629 | "pswpout", | |
630 | ||
27bf71c2 | 631 | TEXTS_FOR_ZONES("pgalloc") |
f6ac2354 CL |
632 | |
633 | "pgfree", | |
634 | "pgactivate", | |
635 | "pgdeactivate", | |
636 | ||
637 | "pgfault", | |
638 | "pgmajfault", | |
639 | ||
27bf71c2 CL |
640 | TEXTS_FOR_ZONES("pgrefill") |
641 | TEXTS_FOR_ZONES("pgsteal") | |
642 | TEXTS_FOR_ZONES("pgscan_kswapd") | |
643 | TEXTS_FOR_ZONES("pgscan_direct") | |
f6ac2354 CL |
644 | |
645 | "pginodesteal", | |
646 | "slabs_scanned", | |
647 | "kswapd_steal", | |
648 | "kswapd_inodesteal", | |
649 | "pageoutrun", | |
650 | "allocstall", | |
651 | ||
652 | "pgrotated", | |
3b116300 AL |
653 | #ifdef CONFIG_HUGETLB_PAGE |
654 | "htlb_buddy_alloc_success", | |
655 | "htlb_buddy_alloc_fail", | |
656 | #endif | |
f8891e5e | 657 | #endif |
f6ac2354 CL |
658 | }; |
659 | ||
467c996c MG |
660 | static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, |
661 | struct zone *zone) | |
f6ac2354 | 662 | { |
467c996c MG |
663 | int i; |
664 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); | |
665 | seq_printf(m, | |
666 | "\n pages free %lu" | |
667 | "\n min %lu" | |
668 | "\n low %lu" | |
669 | "\n high %lu" | |
670 | "\n scanned %lu (a: %lu i: %lu)" | |
671 | "\n spanned %lu" | |
672 | "\n present %lu", | |
673 | zone_page_state(zone, NR_FREE_PAGES), | |
674 | zone->pages_min, | |
675 | zone->pages_low, | |
676 | zone->pages_high, | |
677 | zone->pages_scanned, | |
678 | zone->nr_scan_active, zone->nr_scan_inactive, | |
679 | zone->spanned_pages, | |
680 | zone->present_pages); | |
681 | ||
682 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
683 | seq_printf(m, "\n %-12s %lu", vmstat_text[i], | |
684 | zone_page_state(zone, i)); | |
685 | ||
686 | seq_printf(m, | |
687 | "\n protection: (%lu", | |
688 | zone->lowmem_reserve[0]); | |
689 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) | |
690 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); | |
691 | seq_printf(m, | |
692 | ")" | |
693 | "\n pagesets"); | |
694 | for_each_online_cpu(i) { | |
695 | struct per_cpu_pageset *pageset; | |
467c996c MG |
696 | |
697 | pageset = zone_pcp(zone, i); | |
3dfa5721 CL |
698 | seq_printf(m, |
699 | "\n cpu: %i" | |
700 | "\n count: %i" | |
701 | "\n high: %i" | |
702 | "\n batch: %i", | |
703 | i, | |
704 | pageset->pcp.count, | |
705 | pageset->pcp.high, | |
706 | pageset->pcp.batch); | |
df9ecaba | 707 | #ifdef CONFIG_SMP |
467c996c MG |
708 | seq_printf(m, "\n vm stats threshold: %d", |
709 | pageset->stat_threshold); | |
df9ecaba | 710 | #endif |
f6ac2354 | 711 | } |
467c996c MG |
712 | seq_printf(m, |
713 | "\n all_unreclaimable: %u" | |
714 | "\n prev_priority: %i" | |
715 | "\n start_pfn: %lu", | |
e815af95 | 716 | zone_is_all_unreclaimable(zone), |
467c996c MG |
717 | zone->prev_priority, |
718 | zone->zone_start_pfn); | |
719 | seq_putc(m, '\n'); | |
720 | } | |
721 | ||
722 | /* | |
723 | * Output information about zones in @pgdat. | |
724 | */ | |
725 | static int zoneinfo_show(struct seq_file *m, void *arg) | |
726 | { | |
727 | pg_data_t *pgdat = (pg_data_t *)arg; | |
728 | walk_zones_in_node(m, pgdat, zoneinfo_show_print); | |
f6ac2354 CL |
729 | return 0; |
730 | } | |
731 | ||
15ad7cdc | 732 | const struct seq_operations zoneinfo_op = { |
f6ac2354 CL |
733 | .start = frag_start, /* iterate over all zones. The same as in |
734 | * fragmentation. */ | |
735 | .next = frag_next, | |
736 | .stop = frag_stop, | |
737 | .show = zoneinfo_show, | |
738 | }; | |
739 | ||
740 | static void *vmstat_start(struct seq_file *m, loff_t *pos) | |
741 | { | |
2244b95a | 742 | unsigned long *v; |
f8891e5e CL |
743 | #ifdef CONFIG_VM_EVENT_COUNTERS |
744 | unsigned long *e; | |
745 | #endif | |
2244b95a | 746 | int i; |
f6ac2354 CL |
747 | |
748 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
749 | return NULL; | |
750 | ||
f8891e5e | 751 | #ifdef CONFIG_VM_EVENT_COUNTERS |
2244b95a | 752 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) |
f8891e5e CL |
753 | + sizeof(struct vm_event_state), GFP_KERNEL); |
754 | #else | |
755 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long), | |
756 | GFP_KERNEL); | |
757 | #endif | |
2244b95a CL |
758 | m->private = v; |
759 | if (!v) | |
f6ac2354 | 760 | return ERR_PTR(-ENOMEM); |
2244b95a CL |
761 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
762 | v[i] = global_page_state(i); | |
f8891e5e CL |
763 | #ifdef CONFIG_VM_EVENT_COUNTERS |
764 | e = v + NR_VM_ZONE_STAT_ITEMS; | |
765 | all_vm_events(e); | |
766 | e[PGPGIN] /= 2; /* sectors -> kbytes */ | |
767 | e[PGPGOUT] /= 2; | |
768 | #endif | |
2244b95a | 769 | return v + *pos; |
f6ac2354 CL |
770 | } |
771 | ||
772 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) | |
773 | { | |
774 | (*pos)++; | |
775 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
776 | return NULL; | |
777 | return (unsigned long *)m->private + *pos; | |
778 | } | |
779 | ||
780 | static int vmstat_show(struct seq_file *m, void *arg) | |
781 | { | |
782 | unsigned long *l = arg; | |
783 | unsigned long off = l - (unsigned long *)m->private; | |
784 | ||
785 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); | |
786 | return 0; | |
787 | } | |
788 | ||
789 | static void vmstat_stop(struct seq_file *m, void *arg) | |
790 | { | |
791 | kfree(m->private); | |
792 | m->private = NULL; | |
793 | } | |
794 | ||
15ad7cdc | 795 | const struct seq_operations vmstat_op = { |
f6ac2354 CL |
796 | .start = vmstat_start, |
797 | .next = vmstat_next, | |
798 | .stop = vmstat_stop, | |
799 | .show = vmstat_show, | |
800 | }; | |
801 | ||
802 | #endif /* CONFIG_PROC_FS */ | |
803 | ||
df9ecaba | 804 | #ifdef CONFIG_SMP |
d1187ed2 | 805 | static DEFINE_PER_CPU(struct delayed_work, vmstat_work); |
77461ab3 | 806 | int sysctl_stat_interval __read_mostly = HZ; |
d1187ed2 CL |
807 | |
808 | static void vmstat_update(struct work_struct *w) | |
809 | { | |
810 | refresh_cpu_vm_stats(smp_processor_id()); | |
77461ab3 CL |
811 | schedule_delayed_work(&__get_cpu_var(vmstat_work), |
812 | sysctl_stat_interval); | |
d1187ed2 CL |
813 | } |
814 | ||
42614fcd | 815 | static void __cpuinit start_cpu_timer(int cpu) |
d1187ed2 CL |
816 | { |
817 | struct delayed_work *vmstat_work = &per_cpu(vmstat_work, cpu); | |
818 | ||
39bf6270 | 819 | INIT_DELAYED_WORK_DEFERRABLE(vmstat_work, vmstat_update); |
d1187ed2 CL |
820 | schedule_delayed_work_on(cpu, vmstat_work, HZ + cpu); |
821 | } | |
822 | ||
df9ecaba CL |
823 | /* |
824 | * Use the cpu notifier to insure that the thresholds are recalculated | |
825 | * when necessary. | |
826 | */ | |
827 | static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb, | |
828 | unsigned long action, | |
829 | void *hcpu) | |
830 | { | |
d1187ed2 CL |
831 | long cpu = (long)hcpu; |
832 | ||
df9ecaba | 833 | switch (action) { |
d1187ed2 CL |
834 | case CPU_ONLINE: |
835 | case CPU_ONLINE_FROZEN: | |
836 | start_cpu_timer(cpu); | |
837 | break; | |
838 | case CPU_DOWN_PREPARE: | |
839 | case CPU_DOWN_PREPARE_FROZEN: | |
840 | cancel_rearming_delayed_work(&per_cpu(vmstat_work, cpu)); | |
841 | per_cpu(vmstat_work, cpu).work.func = NULL; | |
842 | break; | |
843 | case CPU_DOWN_FAILED: | |
844 | case CPU_DOWN_FAILED_FROZEN: | |
845 | start_cpu_timer(cpu); | |
846 | break; | |
ce421c79 | 847 | case CPU_DEAD: |
8bb78442 | 848 | case CPU_DEAD_FROZEN: |
ce421c79 AW |
849 | refresh_zone_stat_thresholds(); |
850 | break; | |
851 | default: | |
852 | break; | |
df9ecaba CL |
853 | } |
854 | return NOTIFY_OK; | |
855 | } | |
856 | ||
857 | static struct notifier_block __cpuinitdata vmstat_notifier = | |
858 | { &vmstat_cpuup_callback, NULL, 0 }; | |
859 | ||
e2fc88d0 | 860 | static int __init setup_vmstat(void) |
df9ecaba | 861 | { |
d1187ed2 CL |
862 | int cpu; |
863 | ||
df9ecaba CL |
864 | refresh_zone_stat_thresholds(); |
865 | register_cpu_notifier(&vmstat_notifier); | |
d1187ed2 CL |
866 | |
867 | for_each_online_cpu(cpu) | |
868 | start_cpu_timer(cpu); | |
df9ecaba CL |
869 | return 0; |
870 | } | |
871 | module_init(setup_vmstat) | |
872 | #endif |