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Christoph Lameterf6ac2352006-06-30 01:55:32 -07001/*
2 * linux/mm/vmstat.c
3 *
4 * Manages VM statistics
5 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
Christoph Lameter2244b952006-06-30 01:55:33 -07006 *
7 * zoned VM statistics
8 * Copyright (C) 2006 Silicon Graphics, Inc.,
9 * Christoph Lameter <christoph@lameter.com>
Christoph Lameterf6ac2352006-06-30 01:55:32 -070010 */
11
Christoph Lameterf6ac2352006-06-30 01:55:32 -070012#include <linux/mm.h>
Alexey Dobriyan4e950f62007-07-30 02:36:13 +040013#include <linux/err.h>
Christoph Lameter2244b952006-06-30 01:55:33 -070014#include <linux/module.h>
Christoph Lameterdf9ecab2006-08-31 21:27:35 -070015#include <linux/cpu.h>
Adrian Bunkc748e132008-07-23 21:27:03 -070016#include <linux/vmstat.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040017#include <linux/sched.h>
Christoph Lameterf6ac2352006-06-30 01:55:32 -070018
Christoph Lameterf8891e52006-06-30 01:55:45 -070019#ifdef CONFIG_VM_EVENT_COUNTERS
20DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}};
21EXPORT_PER_CPU_SYMBOL(vm_event_states);
22
23static void sum_vm_events(unsigned long *ret, cpumask_t *cpumask)
24{
Christoph Lameter9eccf2a2008-02-04 22:29:22 -080025 int cpu;
Christoph Lameterf8891e52006-06-30 01:55:45 -070026 int i;
27
28 memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long));
29
Mike Travis6d6a4362008-05-12 21:21:13 +020030 for_each_cpu_mask_nr(cpu, *cpumask) {
Christoph Lameterf8891e52006-06-30 01:55:45 -070031 struct vm_event_state *this = &per_cpu(vm_event_states, cpu);
32
Christoph Lameterf8891e52006-06-30 01:55:45 -070033 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*/
43void all_vm_events(unsigned long *ret)
44{
KOSAKI Motohirob5be1132008-05-12 14:02:06 -070045 get_online_cpus();
Christoph Lameterf8891e52006-06-30 01:55:45 -070046 sum_vm_events(ret, &cpu_online_map);
KOSAKI Motohirob5be1132008-05-12 14:02:06 -070047 put_online_cpus();
Christoph Lameterf8891e52006-06-30 01:55:45 -070048}
Heiko Carstens32dd66f2006-07-10 04:44:31 -070049EXPORT_SYMBOL_GPL(all_vm_events);
Christoph Lameterf8891e52006-06-30 01:55:45 -070050
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 */
58void 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
Christoph Lameter2244b952006-06-30 01:55:33 -070072/*
73 * Manage combined zone based / global counters
74 *
75 * vm_stat contains the global counters
76 */
77atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
78EXPORT_SYMBOL(vm_stat);
79
80#ifdef CONFIG_SMP
81
Christoph Lameterdf9ecab2006-08-31 21:27:35 -070082static 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}
Christoph Lameter2244b952006-06-30 01:55:33 -0700128
129/*
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700130 * Refresh the thresholds for each zone.
Christoph Lameter2244b952006-06-30 01:55:33 -0700131 */
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700132static void refresh_zone_stat_thresholds(void)
Christoph Lameter2244b952006-06-30 01:55:33 -0700133{
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700134 struct zone *zone;
135 int cpu;
136 int threshold;
137
138 for_each_zone(zone) {
139
140 if (!zone->present_pages)
141 continue;
142
143 threshold = calculate_threshold(zone);
144
145 for_each_online_cpu(cpu)
146 zone_pcp(zone, cpu)->stat_threshold = threshold;
147 }
Christoph Lameter2244b952006-06-30 01:55:33 -0700148}
149
150/*
151 * For use when we know that interrupts are disabled.
152 */
153void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
154 int delta)
155{
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700156 struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id());
157 s8 *p = pcp->vm_stat_diff + item;
Christoph Lameter2244b952006-06-30 01:55:33 -0700158 long x;
159
Christoph Lameter2244b952006-06-30 01:55:33 -0700160 x = delta + *p;
161
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700162 if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) {
Christoph Lameter2244b952006-06-30 01:55:33 -0700163 zone_page_state_add(x, zone, item);
164 x = 0;
165 }
Christoph Lameter2244b952006-06-30 01:55:33 -0700166 *p = x;
167}
168EXPORT_SYMBOL(__mod_zone_page_state);
169
170/*
171 * For an unknown interrupt state
172 */
173void mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
174 int delta)
175{
176 unsigned long flags;
177
178 local_irq_save(flags);
179 __mod_zone_page_state(zone, item, delta);
180 local_irq_restore(flags);
181}
182EXPORT_SYMBOL(mod_zone_page_state);
183
184/*
185 * Optimized increment and decrement functions.
186 *
187 * These are only for a single page and therefore can take a struct page *
188 * argument instead of struct zone *. This allows the inclusion of the code
189 * generated for page_zone(page) into the optimized functions.
190 *
191 * No overflow check is necessary and therefore the differential can be
192 * incremented or decremented in place which may allow the compilers to
193 * generate better code.
Christoph Lameter2244b952006-06-30 01:55:33 -0700194 * The increment or decrement is known and therefore one boundary check can
195 * be omitted.
196 *
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700197 * NOTE: These functions are very performance sensitive. Change only
198 * with care.
199 *
Christoph Lameter2244b952006-06-30 01:55:33 -0700200 * Some processors have inc/dec instructions that are atomic vs an interrupt.
201 * However, the code must first determine the differential location in a zone
202 * based on the processor number and then inc/dec the counter. There is no
203 * guarantee without disabling preemption that the processor will not change
204 * in between and therefore the atomicity vs. interrupt cannot be exploited
205 * in a useful way here.
206 */
Christoph Lameterc8785382007-02-10 01:43:01 -0800207void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
Christoph Lameter2244b952006-06-30 01:55:33 -0700208{
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700209 struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id());
210 s8 *p = pcp->vm_stat_diff + item;
Christoph Lameter2244b952006-06-30 01:55:33 -0700211
212 (*p)++;
213
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700214 if (unlikely(*p > pcp->stat_threshold)) {
215 int overstep = pcp->stat_threshold / 2;
216
217 zone_page_state_add(*p + overstep, zone, item);
218 *p = -overstep;
Christoph Lameter2244b952006-06-30 01:55:33 -0700219 }
220}
Christoph Lameterca889e62006-06-30 01:55:44 -0700221
222void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
223{
224 __inc_zone_state(page_zone(page), item);
225}
Christoph Lameter2244b952006-06-30 01:55:33 -0700226EXPORT_SYMBOL(__inc_zone_page_state);
227
Christoph Lameterc8785382007-02-10 01:43:01 -0800228void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
Christoph Lameter2244b952006-06-30 01:55:33 -0700229{
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700230 struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id());
231 s8 *p = pcp->vm_stat_diff + item;
Christoph Lameter2244b952006-06-30 01:55:33 -0700232
233 (*p)--;
234
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700235 if (unlikely(*p < - pcp->stat_threshold)) {
236 int overstep = pcp->stat_threshold / 2;
237
238 zone_page_state_add(*p - overstep, zone, item);
239 *p = overstep;
Christoph Lameter2244b952006-06-30 01:55:33 -0700240 }
241}
Christoph Lameterc8785382007-02-10 01:43:01 -0800242
243void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
244{
245 __dec_zone_state(page_zone(page), item);
246}
Christoph Lameter2244b952006-06-30 01:55:33 -0700247EXPORT_SYMBOL(__dec_zone_page_state);
248
Christoph Lameterca889e62006-06-30 01:55:44 -0700249void inc_zone_state(struct zone *zone, enum zone_stat_item item)
250{
251 unsigned long flags;
252
253 local_irq_save(flags);
254 __inc_zone_state(zone, item);
255 local_irq_restore(flags);
256}
257
Christoph Lameter2244b952006-06-30 01:55:33 -0700258void inc_zone_page_state(struct page *page, enum zone_stat_item item)
259{
260 unsigned long flags;
261 struct zone *zone;
Christoph Lameter2244b952006-06-30 01:55:33 -0700262
263 zone = page_zone(page);
264 local_irq_save(flags);
Christoph Lameterca889e62006-06-30 01:55:44 -0700265 __inc_zone_state(zone, item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700266 local_irq_restore(flags);
267}
268EXPORT_SYMBOL(inc_zone_page_state);
269
270void dec_zone_page_state(struct page *page, enum zone_stat_item item)
271{
272 unsigned long flags;
Christoph Lameter2244b952006-06-30 01:55:33 -0700273
Christoph Lameter2244b952006-06-30 01:55:33 -0700274 local_irq_save(flags);
Christoph Lametera302eb42006-08-31 21:27:34 -0700275 __dec_zone_page_state(page, item);
Christoph Lameter2244b952006-06-30 01:55:33 -0700276 local_irq_restore(flags);
277}
278EXPORT_SYMBOL(dec_zone_page_state);
279
280/*
281 * Update the zone counters for one cpu.
Christoph Lameter4037d452007-05-09 02:35:14 -0700282 *
Christoph Lametera7f75e22008-02-04 22:29:16 -0800283 * The cpu specified must be either the current cpu or a processor that
284 * is not online. If it is the current cpu then the execution thread must
285 * be pinned to the current cpu.
286 *
Christoph Lameter4037d452007-05-09 02:35:14 -0700287 * Note that refresh_cpu_vm_stats strives to only access
288 * node local memory. The per cpu pagesets on remote zones are placed
289 * in the memory local to the processor using that pageset. So the
290 * loop over all zones will access a series of cachelines local to
291 * the processor.
292 *
293 * The call to zone_page_state_add updates the cachelines with the
294 * statistics in the remote zone struct as well as the global cachelines
295 * with the global counters. These could cause remote node cache line
296 * bouncing and will have to be only done when necessary.
Christoph Lameter2244b952006-06-30 01:55:33 -0700297 */
298void refresh_cpu_vm_stats(int cpu)
299{
300 struct zone *zone;
301 int i;
Christoph Lametera7f75e22008-02-04 22:29:16 -0800302 int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, };
Christoph Lameter2244b952006-06-30 01:55:33 -0700303
304 for_each_zone(zone) {
Christoph Lameter4037d452007-05-09 02:35:14 -0700305 struct per_cpu_pageset *p;
Christoph Lameter2244b952006-06-30 01:55:33 -0700306
Christoph Lameter39bbcb82006-09-25 23:31:49 -0700307 if (!populated_zone(zone))
308 continue;
309
Christoph Lameter4037d452007-05-09 02:35:14 -0700310 p = zone_pcp(zone, cpu);
Christoph Lameter2244b952006-06-30 01:55:33 -0700311
312 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
Christoph Lameter4037d452007-05-09 02:35:14 -0700313 if (p->vm_stat_diff[i]) {
Christoph Lametera7f75e22008-02-04 22:29:16 -0800314 unsigned long flags;
315 int v;
316
Christoph Lameter2244b952006-06-30 01:55:33 -0700317 local_irq_save(flags);
Christoph Lametera7f75e22008-02-04 22:29:16 -0800318 v = p->vm_stat_diff[i];
Christoph Lameter4037d452007-05-09 02:35:14 -0700319 p->vm_stat_diff[i] = 0;
Christoph Lametera7f75e22008-02-04 22:29:16 -0800320 local_irq_restore(flags);
321 atomic_long_add(v, &zone->vm_stat[i]);
322 global_diff[i] += v;
Christoph Lameter4037d452007-05-09 02:35:14 -0700323#ifdef CONFIG_NUMA
324 /* 3 seconds idle till flush */
325 p->expire = 3;
326#endif
Christoph Lameter2244b952006-06-30 01:55:33 -0700327 }
Dimitri Sivanich468fd622008-04-28 02:13:37 -0700328 cond_resched();
Christoph Lameter4037d452007-05-09 02:35:14 -0700329#ifdef CONFIG_NUMA
330 /*
331 * Deal with draining the remote pageset of this
332 * processor
333 *
334 * Check if there are pages remaining in this pageset
335 * if not then there is nothing to expire.
336 */
Christoph Lameter3dfa5722008-02-04 22:29:19 -0800337 if (!p->expire || !p->pcp.count)
Christoph Lameter4037d452007-05-09 02:35:14 -0700338 continue;
339
340 /*
341 * We never drain zones local to this processor.
342 */
343 if (zone_to_nid(zone) == numa_node_id()) {
344 p->expire = 0;
345 continue;
346 }
347
348 p->expire--;
349 if (p->expire)
350 continue;
351
Christoph Lameter3dfa5722008-02-04 22:29:19 -0800352 if (p->pcp.count)
353 drain_zone_pages(zone, &p->pcp);
Christoph Lameter4037d452007-05-09 02:35:14 -0700354#endif
Christoph Lameter2244b952006-06-30 01:55:33 -0700355 }
Christoph Lametera7f75e22008-02-04 22:29:16 -0800356
357 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
358 if (global_diff[i])
359 atomic_long_add(global_diff[i], &vm_stat[i]);
Christoph Lameter2244b952006-06-30 01:55:33 -0700360}
361
Christoph Lameter2244b952006-06-30 01:55:33 -0700362#endif
363
Christoph Lameterca889e62006-06-30 01:55:44 -0700364#ifdef CONFIG_NUMA
365/*
366 * zonelist = the list of zones passed to the allocator
367 * z = the zone from which the allocation occurred.
368 *
369 * Must be called with interrupts disabled.
370 */
Mel Gorman18ea7e72008-04-28 02:12:14 -0700371void zone_statistics(struct zone *preferred_zone, struct zone *z)
Christoph Lameterca889e62006-06-30 01:55:44 -0700372{
Mel Gorman18ea7e72008-04-28 02:12:14 -0700373 if (z->zone_pgdat == preferred_zone->zone_pgdat) {
Christoph Lameterca889e62006-06-30 01:55:44 -0700374 __inc_zone_state(z, NUMA_HIT);
375 } else {
376 __inc_zone_state(z, NUMA_MISS);
Mel Gorman18ea7e72008-04-28 02:12:14 -0700377 __inc_zone_state(preferred_zone, NUMA_FOREIGN);
Christoph Lameterca889e62006-06-30 01:55:44 -0700378 }
Christoph Lameter5d292342006-09-27 01:50:10 -0700379 if (z->node == numa_node_id())
Christoph Lameterca889e62006-06-30 01:55:44 -0700380 __inc_zone_state(z, NUMA_LOCAL);
381 else
382 __inc_zone_state(z, NUMA_OTHER);
383}
384#endif
385
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700386#ifdef CONFIG_PROC_FS
387
388#include <linux/seq_file.h>
389
Mel Gorman467c9962007-10-16 01:26:02 -0700390static char * const migratetype_names[MIGRATE_TYPES] = {
391 "Unmovable",
392 "Reclaimable",
393 "Movable",
394 "Reserve",
KOSAKI Motohiro91446b02008-04-15 14:34:42 -0700395 "Isolate",
Mel Gorman467c9962007-10-16 01:26:02 -0700396};
397
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700398static void *frag_start(struct seq_file *m, loff_t *pos)
399{
400 pg_data_t *pgdat;
401 loff_t node = *pos;
402 for (pgdat = first_online_pgdat();
403 pgdat && node;
404 pgdat = next_online_pgdat(pgdat))
405 --node;
406
407 return pgdat;
408}
409
410static void *frag_next(struct seq_file *m, void *arg, loff_t *pos)
411{
412 pg_data_t *pgdat = (pg_data_t *)arg;
413
414 (*pos)++;
415 return next_online_pgdat(pgdat);
416}
417
418static void frag_stop(struct seq_file *m, void *arg)
419{
420}
421
Mel Gorman467c9962007-10-16 01:26:02 -0700422/* Walk all the zones in a node and print using a callback */
423static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat,
424 void (*print)(struct seq_file *m, pg_data_t *, struct zone *))
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700425{
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700426 struct zone *zone;
427 struct zone *node_zones = pgdat->node_zones;
428 unsigned long flags;
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700429
430 for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
431 if (!populated_zone(zone))
432 continue;
433
434 spin_lock_irqsave(&zone->lock, flags);
Mel Gorman467c9962007-10-16 01:26:02 -0700435 print(m, pgdat, zone);
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700436 spin_unlock_irqrestore(&zone->lock, flags);
Mel Gorman467c9962007-10-16 01:26:02 -0700437 }
438}
439
440static void frag_show_print(struct seq_file *m, pg_data_t *pgdat,
441 struct zone *zone)
442{
443 int order;
444
445 seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
446 for (order = 0; order < MAX_ORDER; ++order)
447 seq_printf(m, "%6lu ", zone->free_area[order].nr_free);
448 seq_putc(m, '\n');
449}
450
451/*
452 * This walks the free areas for each zone.
453 */
454static int frag_show(struct seq_file *m, void *arg)
455{
456 pg_data_t *pgdat = (pg_data_t *)arg;
457 walk_zones_in_node(m, pgdat, frag_show_print);
458 return 0;
459}
460
461static void pagetypeinfo_showfree_print(struct seq_file *m,
462 pg_data_t *pgdat, struct zone *zone)
463{
464 int order, mtype;
465
466 for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) {
467 seq_printf(m, "Node %4d, zone %8s, type %12s ",
468 pgdat->node_id,
469 zone->name,
470 migratetype_names[mtype]);
471 for (order = 0; order < MAX_ORDER; ++order) {
472 unsigned long freecount = 0;
473 struct free_area *area;
474 struct list_head *curr;
475
476 area = &(zone->free_area[order]);
477
478 list_for_each(curr, &area->free_list[mtype])
479 freecount++;
480 seq_printf(m, "%6lu ", freecount);
481 }
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700482 seq_putc(m, '\n');
483 }
Mel Gorman467c9962007-10-16 01:26:02 -0700484}
485
486/* Print out the free pages at each order for each migatetype */
487static int pagetypeinfo_showfree(struct seq_file *m, void *arg)
488{
489 int order;
490 pg_data_t *pgdat = (pg_data_t *)arg;
491
492 /* Print header */
493 seq_printf(m, "%-43s ", "Free pages count per migrate type at order");
494 for (order = 0; order < MAX_ORDER; ++order)
495 seq_printf(m, "%6d ", order);
496 seq_putc(m, '\n');
497
498 walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print);
499
500 return 0;
501}
502
503static void pagetypeinfo_showblockcount_print(struct seq_file *m,
504 pg_data_t *pgdat, struct zone *zone)
505{
506 int mtype;
507 unsigned long pfn;
508 unsigned long start_pfn = zone->zone_start_pfn;
509 unsigned long end_pfn = start_pfn + zone->spanned_pages;
510 unsigned long count[MIGRATE_TYPES] = { 0, };
511
512 for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) {
513 struct page *page;
514
515 if (!pfn_valid(pfn))
516 continue;
517
518 page = pfn_to_page(pfn);
Mel Gormane80d6a22008-08-14 11:10:14 +0100519#ifdef CONFIG_ARCH_FLATMEM_HAS_HOLES
520 /*
521 * Ordinarily, memory holes in flatmem still have a valid
522 * memmap for the PFN range. However, an architecture for
523 * embedded systems (e.g. ARM) can free up the memmap backing
524 * holes to save memory on the assumption the memmap is
525 * never used. The page_zone linkages are then broken even
526 * though pfn_valid() returns true. Skip the page if the
527 * linkages are broken. Even if this test passed, the impact
528 * is that the counters for the movable type are off but
529 * fragmentation monitoring is likely meaningless on small
530 * systems.
531 */
532 if (page_zone(page) != zone)
533 continue;
534#endif
Mel Gorman467c9962007-10-16 01:26:02 -0700535 mtype = get_pageblock_migratetype(page);
536
Mel Gormane80d6a22008-08-14 11:10:14 +0100537 if (mtype < MIGRATE_TYPES)
538 count[mtype]++;
Mel Gorman467c9962007-10-16 01:26:02 -0700539 }
540
541 /* Print counts */
542 seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
543 for (mtype = 0; mtype < MIGRATE_TYPES; mtype++)
544 seq_printf(m, "%12lu ", count[mtype]);
545 seq_putc(m, '\n');
546}
547
548/* Print out the free pages at each order for each migratetype */
549static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg)
550{
551 int mtype;
552 pg_data_t *pgdat = (pg_data_t *)arg;
553
554 seq_printf(m, "\n%-23s", "Number of blocks type ");
555 for (mtype = 0; mtype < MIGRATE_TYPES; mtype++)
556 seq_printf(m, "%12s ", migratetype_names[mtype]);
557 seq_putc(m, '\n');
558 walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print);
559
560 return 0;
561}
562
563/*
564 * This prints out statistics in relation to grouping pages by mobility.
565 * It is expensive to collect so do not constantly read the file.
566 */
567static int pagetypeinfo_show(struct seq_file *m, void *arg)
568{
569 pg_data_t *pgdat = (pg_data_t *)arg;
570
KOSAKI Motohiro41b25a32008-04-30 00:52:13 -0700571 /* check memoryless node */
572 if (!node_state(pgdat->node_id, N_HIGH_MEMORY))
573 return 0;
574
Mel Gorman467c9962007-10-16 01:26:02 -0700575 seq_printf(m, "Page block order: %d\n", pageblock_order);
576 seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages);
577 seq_putc(m, '\n');
578 pagetypeinfo_showfree(m, pgdat);
579 pagetypeinfo_showblockcount(m, pgdat);
580
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700581 return 0;
582}
583
Helge Deller15ad7cd2006-12-06 20:40:36 -0800584const struct seq_operations fragmentation_op = {
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700585 .start = frag_start,
586 .next = frag_next,
587 .stop = frag_stop,
588 .show = frag_show,
589};
590
Mel Gorman467c9962007-10-16 01:26:02 -0700591const struct seq_operations pagetypeinfo_op = {
592 .start = frag_start,
593 .next = frag_next,
594 .stop = frag_stop,
595 .show = pagetypeinfo_show,
596};
597
Christoph Lameter4b51d662007-02-10 01:43:10 -0800598#ifdef CONFIG_ZONE_DMA
599#define TEXT_FOR_DMA(xx) xx "_dma",
600#else
601#define TEXT_FOR_DMA(xx)
602#endif
603
Christoph Lameter27bf71c2006-09-25 23:31:15 -0700604#ifdef CONFIG_ZONE_DMA32
605#define TEXT_FOR_DMA32(xx) xx "_dma32",
606#else
607#define TEXT_FOR_DMA32(xx)
608#endif
609
610#ifdef CONFIG_HIGHMEM
611#define TEXT_FOR_HIGHMEM(xx) xx "_high",
612#else
613#define TEXT_FOR_HIGHMEM(xx)
614#endif
615
Christoph Lameter4b51d662007-02-10 01:43:10 -0800616#define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \
Mel Gorman2a1e2742007-07-17 04:03:12 -0700617 TEXT_FOR_HIGHMEM(xx) xx "_movable",
Christoph Lameter27bf71c2006-09-25 23:31:15 -0700618
Helge Deller15ad7cd2006-12-06 20:40:36 -0800619static const char * const vmstat_text[] = {
Christoph Lameter2244b952006-06-30 01:55:33 -0700620 /* Zoned VM counters */
Christoph Lameterd23ad422007-02-10 01:43:02 -0800621 "nr_free_pages",
Rik van Riel4f98a2f2008-10-18 20:26:32 -0700622 "nr_inactive_anon",
623 "nr_active_anon",
624 "nr_inactive_file",
625 "nr_active_file",
Lee Schermerhorn7b854122008-10-18 20:26:40 -0700626#ifdef CONFIG_UNEVICTABLE_LRU
627 "nr_unevictable",
Nick Piggin5344b7e2008-10-18 20:26:51 -0700628 "nr_mlock",
Lee Schermerhorn7b854122008-10-18 20:26:40 -0700629#endif
Christoph Lameterf3dbd342006-06-30 01:55:36 -0700630 "nr_anon_pages",
Christoph Lameter65ba55f2006-06-30 01:55:34 -0700631 "nr_mapped",
Christoph Lameter347ce432006-06-30 01:55:35 -0700632 "nr_file_pages",
Christoph Lameter51ed4492007-02-10 01:43:02 -0800633 "nr_dirty",
634 "nr_writeback",
Christoph Lameter972d1a72006-09-25 23:31:51 -0700635 "nr_slab_reclaimable",
636 "nr_slab_unreclaimable",
Christoph Lameterdf849a12006-06-30 01:55:38 -0700637 "nr_page_table_pages",
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700638 "nr_unstable",
Christoph Lameterd2c5e302006-06-30 01:55:41 -0700639 "nr_bounce",
Andrew Mortone129b5c2006-09-27 01:50:00 -0700640 "nr_vmscan_write",
Miklos Szeredifc3ba692008-04-30 00:54:38 -0700641 "nr_writeback_temp",
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700642
Christoph Lameterca889e62006-06-30 01:55:44 -0700643#ifdef CONFIG_NUMA
644 "numa_hit",
645 "numa_miss",
646 "numa_foreign",
647 "numa_interleave",
648 "numa_local",
649 "numa_other",
650#endif
651
Christoph Lameterf8891e52006-06-30 01:55:45 -0700652#ifdef CONFIG_VM_EVENT_COUNTERS
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700653 "pgpgin",
654 "pgpgout",
655 "pswpin",
656 "pswpout",
657
Christoph Lameter27bf71c2006-09-25 23:31:15 -0700658 TEXTS_FOR_ZONES("pgalloc")
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700659
660 "pgfree",
661 "pgactivate",
662 "pgdeactivate",
663
664 "pgfault",
665 "pgmajfault",
666
Christoph Lameter27bf71c2006-09-25 23:31:15 -0700667 TEXTS_FOR_ZONES("pgrefill")
668 TEXTS_FOR_ZONES("pgsteal")
669 TEXTS_FOR_ZONES("pgscan_kswapd")
670 TEXTS_FOR_ZONES("pgscan_direct")
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700671
672 "pginodesteal",
673 "slabs_scanned",
674 "kswapd_steal",
675 "kswapd_inodesteal",
676 "pageoutrun",
677 "allocstall",
678
679 "pgrotated",
Adam Litke3b116302008-04-28 02:13:06 -0700680#ifdef CONFIG_HUGETLB_PAGE
681 "htlb_buddy_alloc_success",
682 "htlb_buddy_alloc_fail",
683#endif
Lee Schermerhornbbfd28e2008-10-18 20:26:40 -0700684#ifdef CONFIG_UNEVICTABLE_LRU
685 "unevictable_pgs_culled",
686 "unevictable_pgs_scanned",
687 "unevictable_pgs_rescued",
Nick Piggin5344b7e2008-10-18 20:26:51 -0700688 "unevictable_pgs_mlocked",
689 "unevictable_pgs_munlocked",
690 "unevictable_pgs_cleared",
691 "unevictable_pgs_stranded",
Lee Schermerhorn985737c2008-10-18 20:26:53 -0700692 "unevictable_pgs_mlockfreed",
Lee Schermerhornbbfd28e2008-10-18 20:26:40 -0700693#endif
Christoph Lameterf8891e52006-06-30 01:55:45 -0700694#endif
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700695};
696
Mel Gorman467c9962007-10-16 01:26:02 -0700697static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
698 struct zone *zone)
699{
700 int i;
701 seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name);
702 seq_printf(m,
703 "\n pages free %lu"
704 "\n min %lu"
705 "\n low %lu"
706 "\n high %lu"
Rik van Riel4f98a2f2008-10-18 20:26:32 -0700707 "\n scanned %lu (aa: %lu ia: %lu af: %lu if: %lu)"
Mel Gorman467c9962007-10-16 01:26:02 -0700708 "\n spanned %lu"
709 "\n present %lu",
710 zone_page_state(zone, NR_FREE_PAGES),
711 zone->pages_min,
712 zone->pages_low,
713 zone->pages_high,
714 zone->pages_scanned,
Rik van Riel4f98a2f2008-10-18 20:26:32 -0700715 zone->lru[LRU_ACTIVE_ANON].nr_scan,
716 zone->lru[LRU_INACTIVE_ANON].nr_scan,
717 zone->lru[LRU_ACTIVE_FILE].nr_scan,
718 zone->lru[LRU_INACTIVE_FILE].nr_scan,
Mel Gorman467c9962007-10-16 01:26:02 -0700719 zone->spanned_pages,
720 zone->present_pages);
721
722 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
723 seq_printf(m, "\n %-12s %lu", vmstat_text[i],
724 zone_page_state(zone, i));
725
726 seq_printf(m,
727 "\n protection: (%lu",
728 zone->lowmem_reserve[0]);
729 for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++)
730 seq_printf(m, ", %lu", zone->lowmem_reserve[i]);
731 seq_printf(m,
732 ")"
733 "\n pagesets");
734 for_each_online_cpu(i) {
735 struct per_cpu_pageset *pageset;
Mel Gorman467c9962007-10-16 01:26:02 -0700736
737 pageset = zone_pcp(zone, i);
Christoph Lameter3dfa5722008-02-04 22:29:19 -0800738 seq_printf(m,
739 "\n cpu: %i"
740 "\n count: %i"
741 "\n high: %i"
742 "\n batch: %i",
743 i,
744 pageset->pcp.count,
745 pageset->pcp.high,
746 pageset->pcp.batch);
Mel Gorman467c9962007-10-16 01:26:02 -0700747#ifdef CONFIG_SMP
748 seq_printf(m, "\n vm stats threshold: %d",
749 pageset->stat_threshold);
750#endif
751 }
752 seq_printf(m,
753 "\n all_unreclaimable: %u"
754 "\n prev_priority: %i"
Rik van Riel556adec2008-10-18 20:26:34 -0700755 "\n start_pfn: %lu"
756 "\n inactive_ratio: %u",
David Rientjese815af92007-10-16 23:25:54 -0700757 zone_is_all_unreclaimable(zone),
Mel Gorman467c9962007-10-16 01:26:02 -0700758 zone->prev_priority,
Rik van Riel556adec2008-10-18 20:26:34 -0700759 zone->zone_start_pfn,
760 zone->inactive_ratio);
Mel Gorman467c9962007-10-16 01:26:02 -0700761 seq_putc(m, '\n');
762}
763
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700764/*
765 * Output information about zones in @pgdat.
766 */
767static int zoneinfo_show(struct seq_file *m, void *arg)
768{
Mel Gorman467c9962007-10-16 01:26:02 -0700769 pg_data_t *pgdat = (pg_data_t *)arg;
770 walk_zones_in_node(m, pgdat, zoneinfo_show_print);
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700771 return 0;
772}
773
Helge Deller15ad7cd2006-12-06 20:40:36 -0800774const struct seq_operations zoneinfo_op = {
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700775 .start = frag_start, /* iterate over all zones. The same as in
776 * fragmentation. */
777 .next = frag_next,
778 .stop = frag_stop,
779 .show = zoneinfo_show,
780};
781
782static void *vmstat_start(struct seq_file *m, loff_t *pos)
783{
Christoph Lameter2244b952006-06-30 01:55:33 -0700784 unsigned long *v;
Christoph Lameterf8891e52006-06-30 01:55:45 -0700785#ifdef CONFIG_VM_EVENT_COUNTERS
786 unsigned long *e;
787#endif
Christoph Lameter2244b952006-06-30 01:55:33 -0700788 int i;
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700789
790 if (*pos >= ARRAY_SIZE(vmstat_text))
791 return NULL;
792
Christoph Lameterf8891e52006-06-30 01:55:45 -0700793#ifdef CONFIG_VM_EVENT_COUNTERS
Christoph Lameter2244b952006-06-30 01:55:33 -0700794 v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long)
Christoph Lameterf8891e52006-06-30 01:55:45 -0700795 + sizeof(struct vm_event_state), GFP_KERNEL);
796#else
797 v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long),
798 GFP_KERNEL);
799#endif
Christoph Lameter2244b952006-06-30 01:55:33 -0700800 m->private = v;
801 if (!v)
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700802 return ERR_PTR(-ENOMEM);
Christoph Lameter2244b952006-06-30 01:55:33 -0700803 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
804 v[i] = global_page_state(i);
Christoph Lameterf8891e52006-06-30 01:55:45 -0700805#ifdef CONFIG_VM_EVENT_COUNTERS
806 e = v + NR_VM_ZONE_STAT_ITEMS;
807 all_vm_events(e);
808 e[PGPGIN] /= 2; /* sectors -> kbytes */
809 e[PGPGOUT] /= 2;
810#endif
Christoph Lameter2244b952006-06-30 01:55:33 -0700811 return v + *pos;
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700812}
813
814static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos)
815{
816 (*pos)++;
817 if (*pos >= ARRAY_SIZE(vmstat_text))
818 return NULL;
819 return (unsigned long *)m->private + *pos;
820}
821
822static int vmstat_show(struct seq_file *m, void *arg)
823{
824 unsigned long *l = arg;
825 unsigned long off = l - (unsigned long *)m->private;
826
827 seq_printf(m, "%s %lu\n", vmstat_text[off], *l);
828 return 0;
829}
830
831static void vmstat_stop(struct seq_file *m, void *arg)
832{
833 kfree(m->private);
834 m->private = NULL;
835}
836
Helge Deller15ad7cd2006-12-06 20:40:36 -0800837const struct seq_operations vmstat_op = {
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700838 .start = vmstat_start,
839 .next = vmstat_next,
840 .stop = vmstat_stop,
841 .show = vmstat_show,
842};
843
844#endif /* CONFIG_PROC_FS */
845
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700846#ifdef CONFIG_SMP
Christoph Lameterd1187ed2007-05-09 02:35:12 -0700847static DEFINE_PER_CPU(struct delayed_work, vmstat_work);
Christoph Lameter77461ab2007-05-09 02:35:13 -0700848int sysctl_stat_interval __read_mostly = HZ;
Christoph Lameterd1187ed2007-05-09 02:35:12 -0700849
850static void vmstat_update(struct work_struct *w)
851{
852 refresh_cpu_vm_stats(smp_processor_id());
Christoph Lameter77461ab2007-05-09 02:35:13 -0700853 schedule_delayed_work(&__get_cpu_var(vmstat_work),
854 sysctl_stat_interval);
Christoph Lameterd1187ed2007-05-09 02:35:12 -0700855}
856
Randy Dunlap42614fc2007-11-14 17:00:12 -0800857static void __cpuinit start_cpu_timer(int cpu)
Christoph Lameterd1187ed2007-05-09 02:35:12 -0700858{
859 struct delayed_work *vmstat_work = &per_cpu(vmstat_work, cpu);
860
Christoph Lameter39bf6272007-05-10 22:22:21 -0700861 INIT_DELAYED_WORK_DEFERRABLE(vmstat_work, vmstat_update);
Christoph Lameterd1187ed2007-05-09 02:35:12 -0700862 schedule_delayed_work_on(cpu, vmstat_work, HZ + cpu);
863}
864
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700865/*
866 * Use the cpu notifier to insure that the thresholds are recalculated
867 * when necessary.
868 */
869static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb,
870 unsigned long action,
871 void *hcpu)
872{
Christoph Lameterd1187ed2007-05-09 02:35:12 -0700873 long cpu = (long)hcpu;
874
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700875 switch (action) {
Christoph Lameterd1187ed2007-05-09 02:35:12 -0700876 case CPU_ONLINE:
877 case CPU_ONLINE_FROZEN:
878 start_cpu_timer(cpu);
879 break;
880 case CPU_DOWN_PREPARE:
881 case CPU_DOWN_PREPARE_FROZEN:
882 cancel_rearming_delayed_work(&per_cpu(vmstat_work, cpu));
883 per_cpu(vmstat_work, cpu).work.func = NULL;
884 break;
885 case CPU_DOWN_FAILED:
886 case CPU_DOWN_FAILED_FROZEN:
887 start_cpu_timer(cpu);
888 break;
Andy Whitcroftce421c72006-12-06 20:33:08 -0800889 case CPU_DEAD:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700890 case CPU_DEAD_FROZEN:
Andy Whitcroftce421c72006-12-06 20:33:08 -0800891 refresh_zone_stat_thresholds();
892 break;
893 default:
894 break;
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700895 }
896 return NOTIFY_OK;
897}
898
899static struct notifier_block __cpuinitdata vmstat_notifier =
900 { &vmstat_cpuup_callback, NULL, 0 };
901
Adrian Bunke2fc88d2007-10-16 01:26:27 -0700902static int __init setup_vmstat(void)
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700903{
Christoph Lameterd1187ed2007-05-09 02:35:12 -0700904 int cpu;
905
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700906 refresh_zone_stat_thresholds();
907 register_cpu_notifier(&vmstat_notifier);
Christoph Lameterd1187ed2007-05-09 02:35:12 -0700908
909 for_each_online_cpu(cpu)
910 start_cpu_timer(cpu);
Christoph Lameterdf9ecab2006-08-31 21:27:35 -0700911 return 0;
912}
913module_init(setup_vmstat)
914#endif