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1 | /* |
2 | * linux/mm/vmstat.c |
3 | * |
4 | * Manages VM statistics |
5 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
6 | * |
7 | * zoned VM statistics |
8 | * Copyright (C) 2006 Silicon Graphics, Inc., |
9 | * Christoph Lameter <christoph@lameter.com> |
10 | */ |
11 | #include <linux/fs.h> |
12 | #include <linux/mm.h> |
13 | #include <linux/err.h> |
14 | #include <linux/module.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/cpu.h> |
17 | #include <linux/vmstat.h> |
18 | #include <linux/sched.h> |
19 | |
20 | #ifdef CONFIG_VM_EVENT_COUNTERS |
21 | DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}}; |
22 | EXPORT_PER_CPU_SYMBOL(vm_event_states); |
23 | |
24 | static void sum_vm_events(unsigned long *ret, const struct cpumask *cpumask) |
25 | { |
26 | int cpu; |
27 | int i; |
28 | |
29 | memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long)); |
30 | |
31 | for_each_cpu(cpu, cpumask) { |
32 | struct vm_event_state *this = &per_cpu(vm_event_states, cpu); |
33 | |
34 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) |
35 | ret[i] += this->event[i]; |
36 | } |
37 | } |
38 | |
39 | /* |
40 | * Accumulate the vm event counters across all CPUs. |
41 | * The result is unavoidably approximate - it can change |
42 | * during and after execution of this function. |
43 | */ |
44 | void all_vm_events(unsigned long *ret) |
45 | { |
46 | get_online_cpus(); |
47 | sum_vm_events(ret, cpu_online_mask); |
48 | put_online_cpus(); |
49 | } |
50 | EXPORT_SYMBOL_GPL(all_vm_events); |
51 | |
52 | #ifdef CONFIG_HOTPLUG |
53 | /* |
54 | * Fold the foreign cpu events into our own. |
55 | * |
56 | * This is adding to the events on one processor |
57 | * but keeps the global counts constant. |
58 | */ |
59 | void vm_events_fold_cpu(int cpu) |
60 | { |
61 | struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu); |
62 | int i; |
63 | |
64 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) { |
65 | count_vm_events(i, fold_state->event[i]); |
66 | fold_state->event[i] = 0; |
67 | } |
68 | } |
69 | #endif /* CONFIG_HOTPLUG */ |
70 | |
71 | #endif /* CONFIG_VM_EVENT_COUNTERS */ |
72 | |
73 | /* |
74 | * Manage combined zone based / global counters |
75 | * |
76 | * vm_stat contains the global counters |
77 | */ |
78 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; |
79 | EXPORT_SYMBOL(vm_stat); |
80 | |
81 | #ifdef CONFIG_SMP |
82 | |
83 | static int calculate_threshold(struct zone *zone) |
84 | { |
85 | int threshold; |
86 | int mem; /* memory in 128 MB units */ |
87 | |
88 | /* |
89 | * The threshold scales with the number of processors and the amount |
90 | * of memory per zone. More memory means that we can defer updates for |
91 | * longer, more processors could lead to more contention. |
92 | * fls() is used to have a cheap way of logarithmic scaling. |
93 | * |
94 | * Some sample thresholds: |
95 | * |
96 | * Threshold Processors (fls) Zonesize fls(mem+1) |
97 | * ------------------------------------------------------------------ |
98 | * 8 1 1 0.9-1 GB 4 |
99 | * 16 2 2 0.9-1 GB 4 |
100 | * 20 2 2 1-2 GB 5 |
101 | * 24 2 2 2-4 GB 6 |
102 | * 28 2 2 4-8 GB 7 |
103 | * 32 2 2 8-16 GB 8 |
104 | * 4 2 2 <128M 1 |
105 | * 30 4 3 2-4 GB 5 |
106 | * 48 4 3 8-16 GB 8 |
107 | * 32 8 4 1-2 GB 4 |
108 | * 32 8 4 0.9-1GB 4 |
109 | * 10 16 5 <128M 1 |
110 | * 40 16 5 900M 4 |
111 | * 70 64 7 2-4 GB 5 |
112 | * 84 64 7 4-8 GB 6 |
113 | * 108 512 9 4-8 GB 6 |
114 | * 125 1024 10 8-16 GB 8 |
115 | * 125 1024 10 16-32 GB 9 |
116 | */ |
117 | |
118 | mem = zone->present_pages >> (27 - PAGE_SHIFT); |
119 | |
120 | threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem)); |
121 | |
122 | /* |
123 | * Maximum threshold is 125 |
124 | */ |
125 | threshold = min(125, threshold); |
126 | |
127 | return threshold; |
128 | } |
129 | |
130 | /* |
131 | * Refresh the thresholds for each zone. |
132 | */ |
133 | static void refresh_zone_stat_thresholds(void) |
134 | { |
135 | struct zone *zone; |
136 | int cpu; |
137 | int threshold; |
138 | |
139 | for_each_populated_zone(zone) { |
140 | threshold = calculate_threshold(zone); |
141 | |
142 | for_each_online_cpu(cpu) |
143 | per_cpu_ptr(zone->pageset, cpu)->stat_threshold |
144 | = threshold; |
145 | } |
146 | } |
147 | |
148 | /* |
149 | * For use when we know that interrupts are disabled. |
150 | */ |
151 | void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, |
152 | int delta) |
153 | { |
154 | struct per_cpu_pageset *pcp = this_cpu_ptr(zone->pageset); |
155 | |
156 | s8 *p = pcp->vm_stat_diff + item; |
157 | long x; |
158 | |
159 | x = delta + *p; |
160 | |
161 | if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) { |
162 | zone_page_state_add(x, zone, item); |
163 | x = 0; |
164 | } |
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. |
193 | * The increment or decrement is known and therefore one boundary check can |
194 | * be omitted. |
195 | * |
196 | * NOTE: These functions are very performance sensitive. Change only |
197 | * with care. |
198 | * |
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 | */ |
206 | void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
207 | { |
208 | struct per_cpu_pageset *pcp = this_cpu_ptr(zone->pageset); |
209 | s8 *p = pcp->vm_stat_diff + item; |
210 | |
211 | (*p)++; |
212 | |
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; |
218 | } |
219 | } |
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 | } |
225 | EXPORT_SYMBOL(__inc_zone_page_state); |
226 | |
227 | void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
228 | { |
229 | struct per_cpu_pageset *pcp = this_cpu_ptr(zone->pageset); |
230 | s8 *p = pcp->vm_stat_diff + item; |
231 | |
232 | (*p)--; |
233 | |
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; |
239 | } |
240 | } |
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 | } |
246 | EXPORT_SYMBOL(__dec_zone_page_state); |
247 | |
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 | |
257 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
258 | { |
259 | unsigned long flags; |
260 | struct zone *zone; |
261 | |
262 | zone = page_zone(page); |
263 | local_irq_save(flags); |
264 | __inc_zone_state(zone, item); |
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; |
272 | |
273 | local_irq_save(flags); |
274 | __dec_zone_page_state(page, item); |
275 | local_irq_restore(flags); |
276 | } |
277 | EXPORT_SYMBOL(dec_zone_page_state); |
278 | |
279 | /* |
280 | * Update the zone counters for one cpu. |
281 | * |
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 | * |
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. |
296 | */ |
297 | void refresh_cpu_vm_stats(int cpu) |
298 | { |
299 | struct zone *zone; |
300 | int i; |
301 | int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, }; |
302 | |
303 | for_each_populated_zone(zone) { |
304 | struct per_cpu_pageset *p; |
305 | |
306 | p = per_cpu_ptr(zone->pageset, cpu); |
307 | |
308 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
309 | if (p->vm_stat_diff[i]) { |
310 | unsigned long flags; |
311 | int v; |
312 | |
313 | local_irq_save(flags); |
314 | v = p->vm_stat_diff[i]; |
315 | p->vm_stat_diff[i] = 0; |
316 | local_irq_restore(flags); |
317 | atomic_long_add(v, &zone->vm_stat[i]); |
318 | global_diff[i] += v; |
319 | #ifdef CONFIG_NUMA |
320 | /* 3 seconds idle till flush */ |
321 | p->expire = 3; |
322 | #endif |
323 | } |
324 | cond_resched(); |
325 | #ifdef CONFIG_NUMA |
326 | /* |
327 | * Deal with draining the remote pageset of this |
328 | * processor |
329 | * |
330 | * Check if there are pages remaining in this pageset |
331 | * if not then there is nothing to expire. |
332 | */ |
333 | if (!p->expire || !p->pcp.count) |
334 | continue; |
335 | |
336 | /* |
337 | * We never drain zones local to this processor. |
338 | */ |
339 | if (zone_to_nid(zone) == numa_node_id()) { |
340 | p->expire = 0; |
341 | continue; |
342 | } |
343 | |
344 | p->expire--; |
345 | if (p->expire) |
346 | continue; |
347 | |
348 | if (p->pcp.count) |
349 | drain_zone_pages(zone, &p->pcp); |
350 | #endif |
351 | } |
352 | |
353 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
354 | if (global_diff[i]) |
355 | atomic_long_add(global_diff[i], &vm_stat[i]); |
356 | } |
357 | |
358 | #endif |
359 | |
360 | #ifdef CONFIG_NUMA |
361 | /* |
362 | * zonelist = the list of zones passed to the allocator |
363 | * z = the zone from which the allocation occurred. |
364 | * |
365 | * Must be called with interrupts disabled. |
366 | */ |
367 | void zone_statistics(struct zone *preferred_zone, struct zone *z) |
368 | { |
369 | if (z->zone_pgdat == preferred_zone->zone_pgdat) { |
370 | __inc_zone_state(z, NUMA_HIT); |
371 | } else { |
372 | __inc_zone_state(z, NUMA_MISS); |
373 | __inc_zone_state(preferred_zone, NUMA_FOREIGN); |
374 | } |
375 | if (z->node == numa_node_id()) |
376 | __inc_zone_state(z, NUMA_LOCAL); |
377 | else |
378 | __inc_zone_state(z, NUMA_OTHER); |
379 | } |
380 | #endif |
381 | |
382 | #ifdef CONFIG_PROC_FS |
383 | #include <linux/proc_fs.h> |
384 | #include <linux/seq_file.h> |
385 | |
386 | static char * const migratetype_names[MIGRATE_TYPES] = { |
387 | "Unmovable", |
388 | "Reclaimable", |
389 | "Movable", |
390 | "Reserve", |
391 | "Isolate", |
392 | }; |
393 | |
394 | static void *frag_start(struct seq_file *m, loff_t *pos) |
395 | { |
396 | pg_data_t *pgdat; |
397 | loff_t node = *pos; |
398 | for (pgdat = first_online_pgdat(); |
399 | pgdat && node; |
400 | pgdat = next_online_pgdat(pgdat)) |
401 | --node; |
402 | |
403 | return pgdat; |
404 | } |
405 | |
406 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) |
407 | { |
408 | pg_data_t *pgdat = (pg_data_t *)arg; |
409 | |
410 | (*pos)++; |
411 | return next_online_pgdat(pgdat); |
412 | } |
413 | |
414 | static void frag_stop(struct seq_file *m, void *arg) |
415 | { |
416 | } |
417 | |
418 | /* Walk all the zones in a node and print using a callback */ |
419 | static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat, |
420 | void (*print)(struct seq_file *m, pg_data_t *, struct zone *)) |
421 | { |
422 | struct zone *zone; |
423 | struct zone *node_zones = pgdat->node_zones; |
424 | unsigned long flags; |
425 | |
426 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { |
427 | if (!populated_zone(zone)) |
428 | continue; |
429 | |
430 | spin_lock_irqsave(&zone->lock, flags); |
431 | print(m, pgdat, zone); |
432 | spin_unlock_irqrestore(&zone->lock, flags); |
433 | } |
434 | } |
435 | |
436 | static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, |
437 | struct zone *zone) |
438 | { |
439 | int order; |
440 | |
441 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); |
442 | for (order = 0; order < MAX_ORDER; ++order) |
443 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); |
444 | seq_putc(m, '\n'); |
445 | } |
446 | |
447 | /* |
448 | * This walks the free areas for each zone. |
449 | */ |
450 | static int frag_show(struct seq_file *m, void *arg) |
451 | { |
452 | pg_data_t *pgdat = (pg_data_t *)arg; |
453 | walk_zones_in_node(m, pgdat, frag_show_print); |
454 | return 0; |
455 | } |
456 | |
457 | static void pagetypeinfo_showfree_print(struct seq_file *m, |
458 | pg_data_t *pgdat, struct zone *zone) |
459 | { |
460 | int order, mtype; |
461 | |
462 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) { |
463 | seq_printf(m, "Node %4d, zone %8s, type %12s ", |
464 | pgdat->node_id, |
465 | zone->name, |
466 | migratetype_names[mtype]); |
467 | for (order = 0; order < MAX_ORDER; ++order) { |
468 | unsigned long freecount = 0; |
469 | struct free_area *area; |
470 | struct list_head *curr; |
471 | |
472 | area = &(zone->free_area[order]); |
473 | |
474 | list_for_each(curr, &area->free_list[mtype]) |
475 | freecount++; |
476 | seq_printf(m, "%6lu ", freecount); |
477 | } |
478 | seq_putc(m, '\n'); |
479 | } |
480 | } |
481 | |
482 | /* Print out the free pages at each order for each migatetype */ |
483 | static int pagetypeinfo_showfree(struct seq_file *m, void *arg) |
484 | { |
485 | int order; |
486 | pg_data_t *pgdat = (pg_data_t *)arg; |
487 | |
488 | /* Print header */ |
489 | seq_printf(m, "%-43s ", "Free pages count per migrate type at order"); |
490 | for (order = 0; order < MAX_ORDER; ++order) |
491 | seq_printf(m, "%6d ", order); |
492 | seq_putc(m, '\n'); |
493 | |
494 | walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print); |
495 | |
496 | return 0; |
497 | } |
498 | |
499 | static void pagetypeinfo_showblockcount_print(struct seq_file *m, |
500 | pg_data_t *pgdat, struct zone *zone) |
501 | { |
502 | int mtype; |
503 | unsigned long pfn; |
504 | unsigned long start_pfn = zone->zone_start_pfn; |
505 | unsigned long end_pfn = start_pfn + zone->spanned_pages; |
506 | unsigned long count[MIGRATE_TYPES] = { 0, }; |
507 | |
508 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { |
509 | struct page *page; |
510 | |
511 | if (!pfn_valid(pfn)) |
512 | continue; |
513 | |
514 | page = pfn_to_page(pfn); |
515 | |
516 | /* Watch for unexpected holes punched in the memmap */ |
517 | if (!memmap_valid_within(pfn, page, zone)) |
518 | continue; |
519 | |
520 | mtype = get_pageblock_migratetype(page); |
521 | |
522 | if (mtype < MIGRATE_TYPES) |
523 | count[mtype]++; |
524 | } |
525 | |
526 | /* Print counts */ |
527 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); |
528 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) |
529 | seq_printf(m, "%12lu ", count[mtype]); |
530 | seq_putc(m, '\n'); |
531 | } |
532 | |
533 | /* Print out the free pages at each order for each migratetype */ |
534 | static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg) |
535 | { |
536 | int mtype; |
537 | pg_data_t *pgdat = (pg_data_t *)arg; |
538 | |
539 | seq_printf(m, "\n%-23s", "Number of blocks type "); |
540 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) |
541 | seq_printf(m, "%12s ", migratetype_names[mtype]); |
542 | seq_putc(m, '\n'); |
543 | walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print); |
544 | |
545 | return 0; |
546 | } |
547 | |
548 | /* |
549 | * This prints out statistics in relation to grouping pages by mobility. |
550 | * It is expensive to collect so do not constantly read the file. |
551 | */ |
552 | static int pagetypeinfo_show(struct seq_file *m, void *arg) |
553 | { |
554 | pg_data_t *pgdat = (pg_data_t *)arg; |
555 | |
556 | /* check memoryless node */ |
557 | if (!node_state(pgdat->node_id, N_HIGH_MEMORY)) |
558 | return 0; |
559 | |
560 | seq_printf(m, "Page block order: %d\n", pageblock_order); |
561 | seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages); |
562 | seq_putc(m, '\n'); |
563 | pagetypeinfo_showfree(m, pgdat); |
564 | pagetypeinfo_showblockcount(m, pgdat); |
565 | |
566 | return 0; |
567 | } |
568 | |
569 | static const struct seq_operations fragmentation_op = { |
570 | .start = frag_start, |
571 | .next = frag_next, |
572 | .stop = frag_stop, |
573 | .show = frag_show, |
574 | }; |
575 | |
576 | static int fragmentation_open(struct inode *inode, struct file *file) |
577 | { |
578 | return seq_open(file, &fragmentation_op); |
579 | } |
580 | |
581 | static const struct file_operations fragmentation_file_operations = { |
582 | .open = fragmentation_open, |
583 | .read = seq_read, |
584 | .llseek = seq_lseek, |
585 | .release = seq_release, |
586 | }; |
587 | |
588 | static const struct seq_operations pagetypeinfo_op = { |
589 | .start = frag_start, |
590 | .next = frag_next, |
591 | .stop = frag_stop, |
592 | .show = pagetypeinfo_show, |
593 | }; |
594 | |
595 | static int pagetypeinfo_open(struct inode *inode, struct file *file) |
596 | { |
597 | return seq_open(file, &pagetypeinfo_op); |
598 | } |
599 | |
600 | static const struct file_operations pagetypeinfo_file_ops = { |
601 | .open = pagetypeinfo_open, |
602 | .read = seq_read, |
603 | .llseek = seq_lseek, |
604 | .release = seq_release, |
605 | }; |
606 | |
607 | #ifdef CONFIG_ZONE_DMA |
608 | #define TEXT_FOR_DMA(xx) xx "_dma", |
609 | #else |
610 | #define TEXT_FOR_DMA(xx) |
611 | #endif |
612 | |
613 | #ifdef CONFIG_ZONE_DMA32 |
614 | #define TEXT_FOR_DMA32(xx) xx "_dma32", |
615 | #else |
616 | #define TEXT_FOR_DMA32(xx) |
617 | #endif |
618 | |
619 | #ifdef CONFIG_HIGHMEM |
620 | #define TEXT_FOR_HIGHMEM(xx) xx "_high", |
621 | #else |
622 | #define TEXT_FOR_HIGHMEM(xx) |
623 | #endif |
624 | |
625 | #define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \ |
626 | TEXT_FOR_HIGHMEM(xx) xx "_movable", |
627 | |
628 | static const char * const vmstat_text[] = { |
629 | /* Zoned VM counters */ |
630 | "nr_free_pages", |
631 | "nr_inactive_anon", |
632 | "nr_active_anon", |
633 | "nr_inactive_file", |
634 | "nr_active_file", |
635 | "nr_unevictable", |
636 | "nr_mlock", |
637 | "nr_anon_pages", |
638 | "nr_mapped", |
639 | "nr_file_pages", |
640 | "nr_dirty", |
641 | "nr_writeback", |
642 | "nr_slab_reclaimable", |
643 | "nr_slab_unreclaimable", |
644 | "nr_page_table_pages", |
645 | "nr_kernel_stack", |
646 | "nr_unstable", |
647 | "nr_bounce", |
648 | "nr_vmscan_write", |
649 | "nr_writeback_temp", |
650 | "nr_isolated_anon", |
651 | "nr_isolated_file", |
652 | "nr_shmem", |
653 | #ifdef CONFIG_NUMA |
654 | "numa_hit", |
655 | "numa_miss", |
656 | "numa_foreign", |
657 | "numa_interleave", |
658 | "numa_local", |
659 | "numa_other", |
660 | #endif |
661 | |
662 | #ifdef CONFIG_VM_EVENT_COUNTERS |
663 | "pgpgin", |
664 | "pgpgout", |
665 | "pswpin", |
666 | "pswpout", |
667 | |
668 | TEXTS_FOR_ZONES("pgalloc") |
669 | |
670 | "pgfree", |
671 | "pgactivate", |
672 | "pgdeactivate", |
673 | |
674 | "pgfault", |
675 | "pgmajfault", |
676 | |
677 | TEXTS_FOR_ZONES("pgrefill") |
678 | TEXTS_FOR_ZONES("pgsteal") |
679 | TEXTS_FOR_ZONES("pgscan_kswapd") |
680 | TEXTS_FOR_ZONES("pgscan_direct") |
681 | |
682 | #ifdef CONFIG_NUMA |
683 | "zone_reclaim_failed", |
684 | #endif |
685 | "pginodesteal", |
686 | "slabs_scanned", |
687 | "kswapd_steal", |
688 | "kswapd_inodesteal", |
689 | "kswapd_low_wmark_hit_quickly", |
690 | "kswapd_high_wmark_hit_quickly", |
691 | "kswapd_skip_congestion_wait", |
692 | "pageoutrun", |
693 | "allocstall", |
694 | |
695 | "pgrotated", |
696 | #ifdef CONFIG_HUGETLB_PAGE |
697 | "htlb_buddy_alloc_success", |
698 | "htlb_buddy_alloc_fail", |
699 | #endif |
700 | "unevictable_pgs_culled", |
701 | "unevictable_pgs_scanned", |
702 | "unevictable_pgs_rescued", |
703 | "unevictable_pgs_mlocked", |
704 | "unevictable_pgs_munlocked", |
705 | "unevictable_pgs_cleared", |
706 | "unevictable_pgs_stranded", |
707 | "unevictable_pgs_mlockfreed", |
708 | #endif |
709 | }; |
710 | |
711 | static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, |
712 | struct zone *zone) |
713 | { |
714 | int i; |
715 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); |
716 | seq_printf(m, |
717 | "\n pages free %lu" |
718 | "\n min %lu" |
719 | "\n low %lu" |
720 | "\n high %lu" |
721 | "\n scanned %lu" |
722 | "\n spanned %lu" |
723 | "\n present %lu", |
724 | zone_page_state(zone, NR_FREE_PAGES), |
725 | min_wmark_pages(zone), |
726 | low_wmark_pages(zone), |
727 | high_wmark_pages(zone), |
728 | zone->pages_scanned, |
729 | zone->spanned_pages, |
730 | zone->present_pages); |
731 | |
732 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
733 | seq_printf(m, "\n %-12s %lu", vmstat_text[i], |
734 | zone_page_state(zone, i)); |
735 | |
736 | seq_printf(m, |
737 | "\n protection: (%lu", |
738 | zone->lowmem_reserve[0]); |
739 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) |
740 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); |
741 | seq_printf(m, |
742 | ")" |
743 | "\n pagesets"); |
744 | for_each_online_cpu(i) { |
745 | struct per_cpu_pageset *pageset; |
746 | |
747 | pageset = per_cpu_ptr(zone->pageset, i); |
748 | seq_printf(m, |
749 | "\n cpu: %i" |
750 | "\n count: %i" |
751 | "\n high: %i" |
752 | "\n batch: %i", |
753 | i, |
754 | pageset->pcp.count, |
755 | pageset->pcp.high, |
756 | pageset->pcp.batch); |
757 | #ifdef CONFIG_SMP |
758 | seq_printf(m, "\n vm stats threshold: %d", |
759 | pageset->stat_threshold); |
760 | #endif |
761 | } |
762 | seq_printf(m, |
763 | "\n all_unreclaimable: %u" |
764 | "\n prev_priority: %i" |
765 | "\n start_pfn: %lu" |
766 | "\n inactive_ratio: %u", |
767 | zone->all_unreclaimable, |
768 | zone->prev_priority, |
769 | zone->zone_start_pfn, |
770 | zone->inactive_ratio); |
771 | seq_putc(m, '\n'); |
772 | } |
773 | |
774 | /* |
775 | * Output information about zones in @pgdat. |
776 | */ |
777 | static int zoneinfo_show(struct seq_file *m, void *arg) |
778 | { |
779 | pg_data_t *pgdat = (pg_data_t *)arg; |
780 | walk_zones_in_node(m, pgdat, zoneinfo_show_print); |
781 | return 0; |
782 | } |
783 | |
784 | static const struct seq_operations zoneinfo_op = { |
785 | .start = frag_start, /* iterate over all zones. The same as in |
786 | * fragmentation. */ |
787 | .next = frag_next, |
788 | .stop = frag_stop, |
789 | .show = zoneinfo_show, |
790 | }; |
791 | |
792 | static int zoneinfo_open(struct inode *inode, struct file *file) |
793 | { |
794 | return seq_open(file, &zoneinfo_op); |
795 | } |
796 | |
797 | static const struct file_operations proc_zoneinfo_file_operations = { |
798 | .open = zoneinfo_open, |
799 | .read = seq_read, |
800 | .llseek = seq_lseek, |
801 | .release = seq_release, |
802 | }; |
803 | |
804 | static void *vmstat_start(struct seq_file *m, loff_t *pos) |
805 | { |
806 | unsigned long *v; |
807 | #ifdef CONFIG_VM_EVENT_COUNTERS |
808 | unsigned long *e; |
809 | #endif |
810 | int i; |
811 | |
812 | if (*pos >= ARRAY_SIZE(vmstat_text)) |
813 | return NULL; |
814 | |
815 | #ifdef CONFIG_VM_EVENT_COUNTERS |
816 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) |
817 | + sizeof(struct vm_event_state), GFP_KERNEL); |
818 | #else |
819 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long), |
820 | GFP_KERNEL); |
821 | #endif |
822 | m->private = v; |
823 | if (!v) |
824 | return ERR_PTR(-ENOMEM); |
825 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
826 | v[i] = global_page_state(i); |
827 | #ifdef CONFIG_VM_EVENT_COUNTERS |
828 | e = v + NR_VM_ZONE_STAT_ITEMS; |
829 | all_vm_events(e); |
830 | e[PGPGIN] /= 2; /* sectors -> kbytes */ |
831 | e[PGPGOUT] /= 2; |
832 | #endif |
833 | return v + *pos; |
834 | } |
835 | |
836 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) |
837 | { |
838 | (*pos)++; |
839 | if (*pos >= ARRAY_SIZE(vmstat_text)) |
840 | return NULL; |
841 | return (unsigned long *)m->private + *pos; |
842 | } |
843 | |
844 | static int vmstat_show(struct seq_file *m, void *arg) |
845 | { |
846 | unsigned long *l = arg; |
847 | unsigned long off = l - (unsigned long *)m->private; |
848 | |
849 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); |
850 | return 0; |
851 | } |
852 | |
853 | static void vmstat_stop(struct seq_file *m, void *arg) |
854 | { |
855 | kfree(m->private); |
856 | m->private = NULL; |
857 | } |
858 | |
859 | static const struct seq_operations vmstat_op = { |
860 | .start = vmstat_start, |
861 | .next = vmstat_next, |
862 | .stop = vmstat_stop, |
863 | .show = vmstat_show, |
864 | }; |
865 | |
866 | static int vmstat_open(struct inode *inode, struct file *file) |
867 | { |
868 | return seq_open(file, &vmstat_op); |
869 | } |
870 | |
871 | static const struct file_operations proc_vmstat_file_operations = { |
872 | .open = vmstat_open, |
873 | .read = seq_read, |
874 | .llseek = seq_lseek, |
875 | .release = seq_release, |
876 | }; |
877 | #endif /* CONFIG_PROC_FS */ |
878 | |
879 | #ifdef CONFIG_SMP |
880 | static DEFINE_PER_CPU(struct delayed_work, vmstat_work); |
881 | int sysctl_stat_interval __read_mostly = HZ; |
882 | |
883 | static void vmstat_update(struct work_struct *w) |
884 | { |
885 | refresh_cpu_vm_stats(smp_processor_id()); |
886 | schedule_delayed_work(&__get_cpu_var(vmstat_work), |
887 | round_jiffies_relative(sysctl_stat_interval)); |
888 | } |
889 | |
890 | static void __cpuinit start_cpu_timer(int cpu) |
891 | { |
892 | struct delayed_work *work = &per_cpu(vmstat_work, cpu); |
893 | |
894 | INIT_DELAYED_WORK_DEFERRABLE(work, vmstat_update); |
895 | schedule_delayed_work_on(cpu, work, __round_jiffies_relative(HZ, cpu)); |
896 | } |
897 | |
898 | /* |
899 | * Use the cpu notifier to insure that the thresholds are recalculated |
900 | * when necessary. |
901 | */ |
902 | static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb, |
903 | unsigned long action, |
904 | void *hcpu) |
905 | { |
906 | long cpu = (long)hcpu; |
907 | |
908 | switch (action) { |
909 | case CPU_ONLINE: |
910 | case CPU_ONLINE_FROZEN: |
911 | start_cpu_timer(cpu); |
912 | node_set_state(cpu_to_node(cpu), N_CPU); |
913 | break; |
914 | case CPU_DOWN_PREPARE: |
915 | case CPU_DOWN_PREPARE_FROZEN: |
916 | cancel_rearming_delayed_work(&per_cpu(vmstat_work, cpu)); |
917 | per_cpu(vmstat_work, cpu).work.func = NULL; |
918 | break; |
919 | case CPU_DOWN_FAILED: |
920 | case CPU_DOWN_FAILED_FROZEN: |
921 | start_cpu_timer(cpu); |
922 | break; |
923 | case CPU_DEAD: |
924 | case CPU_DEAD_FROZEN: |
925 | refresh_zone_stat_thresholds(); |
926 | break; |
927 | default: |
928 | break; |
929 | } |
930 | return NOTIFY_OK; |
931 | } |
932 | |
933 | static struct notifier_block __cpuinitdata vmstat_notifier = |
934 | { &vmstat_cpuup_callback, NULL, 0 }; |
935 | #endif |
936 | |
937 | static int __init setup_vmstat(void) |
938 | { |
939 | #ifdef CONFIG_SMP |
940 | int cpu; |
941 | |
942 | refresh_zone_stat_thresholds(); |
943 | register_cpu_notifier(&vmstat_notifier); |
944 | |
945 | for_each_online_cpu(cpu) |
946 | start_cpu_timer(cpu); |
947 | #endif |
948 | #ifdef CONFIG_PROC_FS |
949 | proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations); |
950 | proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops); |
951 | proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations); |
952 | proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations); |
953 | #endif |
954 | return 0; |
955 | } |
956 | module_init(setup_vmstat) |
957 |
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