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/cpu.h>
16 #include <linux/vmstat.h>
17 #include <linux/sched.h>
18
19 #ifdef CONFIG_VM_EVENT_COUNTERS
20 DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}};
21 EXPORT_PER_CPU_SYMBOL(vm_event_states);
22
sum_vm_events(unsigned long * ret,const struct cpumask * cpumask)23 static void sum_vm_events(unsigned long *ret, const struct cpumask *cpumask)
24 {
25 int cpu;
26 int i;
27
28 memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long));
29
30 for_each_cpu_mask_nr(cpu, *cpumask) {
31 struct vm_event_state *this = &per_cpu(vm_event_states, cpu);
32
33 for (i = 0; i < NR_VM_EVENT_ITEMS; i++)
34 ret[i] += this->event[i];
35 }
36 }
37
38 /*
39 * Accumulate the vm event counters across all CPUs.
40 * The result is unavoidably approximate - it can change
41 * during and after execution of this function.
42 */
all_vm_events(unsigned long * ret)43 void all_vm_events(unsigned long *ret)
44 {
45 get_online_cpus();
46 sum_vm_events(ret, cpu_online_mask);
47 put_online_cpus();
48 }
49 EXPORT_SYMBOL_GPL(all_vm_events);
50
51 #ifdef CONFIG_HOTPLUG
52 /*
53 * Fold the foreign cpu events into our own.
54 *
55 * This is adding to the events on one processor
56 * but keeps the global counts constant.
57 */
vm_events_fold_cpu(int cpu)58 void vm_events_fold_cpu(int cpu)
59 {
60 struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu);
61 int i;
62
63 for (i = 0; i < NR_VM_EVENT_ITEMS; i++) {
64 count_vm_events(i, fold_state->event[i]);
65 fold_state->event[i] = 0;
66 }
67 }
68 #endif /* CONFIG_HOTPLUG */
69
70 #endif /* CONFIG_VM_EVENT_COUNTERS */
71
72 /*
73 * Manage combined zone based / global counters
74 *
75 * vm_stat contains the global counters
76 */
77 atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
78 EXPORT_SYMBOL(vm_stat);
79
80 #ifdef CONFIG_SMP
81
calculate_threshold(struct zone * zone)82 static int calculate_threshold(struct zone *zone)
83 {
84 int threshold;
85 int mem; /* memory in 128 MB units */
86
87 /*
88 * The threshold scales with the number of processors and the amount
89 * of memory per zone. More memory means that we can defer updates for
90 * longer, more processors could lead to more contention.
91 * fls() is used to have a cheap way of logarithmic scaling.
92 *
93 * Some sample thresholds:
94 *
95 * Threshold Processors (fls) Zonesize fls(mem+1)
96 * ------------------------------------------------------------------
97 * 8 1 1 0.9-1 GB 4
98 * 16 2 2 0.9-1 GB 4
99 * 20 2 2 1-2 GB 5
100 * 24 2 2 2-4 GB 6
101 * 28 2 2 4-8 GB 7
102 * 32 2 2 8-16 GB 8
103 * 4 2 2 <128M 1
104 * 30 4 3 2-4 GB 5
105 * 48 4 3 8-16 GB 8
106 * 32 8 4 1-2 GB 4
107 * 32 8 4 0.9-1GB 4
108 * 10 16 5 <128M 1
109 * 40 16 5 900M 4
110 * 70 64 7 2-4 GB 5
111 * 84 64 7 4-8 GB 6
112 * 108 512 9 4-8 GB 6
113 * 125 1024 10 8-16 GB 8
114 * 125 1024 10 16-32 GB 9
115 */
116
117 mem = zone->present_pages >> (27 - PAGE_SHIFT);
118
119 threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem));
120
121 /*
122 * Maximum threshold is 125
123 */
124 threshold = min(125, threshold);
125
126 return threshold;
127 }
128
129 /*
130 * Refresh the thresholds for each zone.
131 */
refresh_zone_stat_thresholds(void)132 static void refresh_zone_stat_thresholds(void)
133 {
134 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 }
148 }
149
150 /*
151 * For use when we know that interrupts are disabled.
152 */
__mod_zone_page_state(struct zone * zone,enum zone_stat_item item,int delta)153 void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
154 int delta)
155 {
156 struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id());
157 s8 *p = pcp->vm_stat_diff + item;
158 long x;
159
160 x = delta + *p;
161
162 if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) {
163 zone_page_state_add(x, zone, item);
164 x = 0;
165 }
166 *p = x;
167 }
168 EXPORT_SYMBOL(__mod_zone_page_state);
169
170 /*
171 * For an unknown interrupt state
172 */
mod_zone_page_state(struct zone * zone,enum zone_stat_item item,int delta)173 void 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 }
182 EXPORT_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.
194 * The increment or decrement is known and therefore one boundary check can
195 * be omitted.
196 *
197 * NOTE: These functions are very performance sensitive. Change only
198 * with care.
199 *
200 * 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 */
__inc_zone_state(struct zone * zone,enum zone_stat_item item)207 void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
208 {
209 struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id());
210 s8 *p = pcp->vm_stat_diff + item;
211
212 (*p)++;
213
214 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;
219 }
220 }
221
__inc_zone_page_state(struct page * page,enum zone_stat_item item)222 void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
223 {
224 __inc_zone_state(page_zone(page), item);
225 }
226 EXPORT_SYMBOL(__inc_zone_page_state);
227
__dec_zone_state(struct zone * zone,enum zone_stat_item item)228 void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
229 {
230 struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id());
231 s8 *p = pcp->vm_stat_diff + item;
232
233 (*p)--;
234
235 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;
240 }
241 }
242
__dec_zone_page_state(struct page * page,enum zone_stat_item item)243 void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
244 {
245 __dec_zone_state(page_zone(page), item);
246 }
247 EXPORT_SYMBOL(__dec_zone_page_state);
248
inc_zone_state(struct zone * zone,enum zone_stat_item item)249 void 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
inc_zone_page_state(struct page * page,enum zone_stat_item item)258 void inc_zone_page_state(struct page *page, enum zone_stat_item item)
259 {
260 unsigned long flags;
261 struct zone *zone;
262
263 zone = page_zone(page);
264 local_irq_save(flags);
265 __inc_zone_state(zone, item);
266 local_irq_restore(flags);
267 }
268 EXPORT_SYMBOL(inc_zone_page_state);
269
dec_zone_page_state(struct page * page,enum zone_stat_item item)270 void dec_zone_page_state(struct page *page, enum zone_stat_item item)
271 {
272 unsigned long flags;
273
274 local_irq_save(flags);
275 __dec_zone_page_state(page, item);
276 local_irq_restore(flags);
277 }
278 EXPORT_SYMBOL(dec_zone_page_state);
279
280 /*
281 * Update the zone counters for one cpu.
282 *
283 * 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 *
287 * 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.
297 */
refresh_cpu_vm_stats(int cpu)298 void refresh_cpu_vm_stats(int cpu)
299 {
300 struct zone *zone;
301 int i;
302 int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, };
303
304 for_each_zone(zone) {
305 struct per_cpu_pageset *p;
306
307 if (!populated_zone(zone))
308 continue;
309
310 p = zone_pcp(zone, cpu);
311
312 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
313 if (p->vm_stat_diff[i]) {
314 unsigned long flags;
315 int v;
316
317 local_irq_save(flags);
318 v = p->vm_stat_diff[i];
319 p->vm_stat_diff[i] = 0;
320 local_irq_restore(flags);
321 atomic_long_add(v, &zone->vm_stat[i]);
322 global_diff[i] += v;
323 #ifdef CONFIG_NUMA
324 /* 3 seconds idle till flush */
325 p->expire = 3;
326 #endif
327 }
328 cond_resched();
329 #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 */
337 if (!p->expire || !p->pcp.count)
338 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
352 if (p->pcp.count)
353 drain_zone_pages(zone, &p->pcp);
354 #endif
355 }
356
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]);
360 }
361
362 #endif
363
364 #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 */
zone_statistics(struct zone * preferred_zone,struct zone * z)371 void zone_statistics(struct zone *preferred_zone, struct zone *z)
372 {
373 if (z->zone_pgdat == preferred_zone->zone_pgdat) {
374 __inc_zone_state(z, NUMA_HIT);
375 } else {
376 __inc_zone_state(z, NUMA_MISS);
377 __inc_zone_state(preferred_zone, NUMA_FOREIGN);
378 }
379 if (z->node == numa_node_id())
380 __inc_zone_state(z, NUMA_LOCAL);
381 else
382 __inc_zone_state(z, NUMA_OTHER);
383 }
384 #endif
385
386 #ifdef CONFIG_PROC_FS
387 #include <linux/proc_fs.h>
388 #include <linux/seq_file.h>
389
390 static char * const migratetype_names[MIGRATE_TYPES] = {
391 "Unmovable",
392 "Reclaimable",
393 "Movable",
394 "Reserve",
395 "Isolate",
396 };
397
frag_start(struct seq_file * m,loff_t * pos)398 static 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
frag_next(struct seq_file * m,void * arg,loff_t * pos)410 static 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
frag_stop(struct seq_file * m,void * arg)418 static void frag_stop(struct seq_file *m, void *arg)
419 {
420 }
421
422 /* Walk all the zones in a node and print using a callback */
walk_zones_in_node(struct seq_file * m,pg_data_t * pgdat,void (* print)(struct seq_file * m,pg_data_t *,struct zone *))423 static 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 *))
425 {
426 struct zone *zone;
427 struct zone *node_zones = pgdat->node_zones;
428 unsigned long flags;
429
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);
435 print(m, pgdat, zone);
436 spin_unlock_irqrestore(&zone->lock, flags);
437 }
438 }
439
frag_show_print(struct seq_file * m,pg_data_t * pgdat,struct zone * zone)440 static 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 */
frag_show(struct seq_file * m,void * arg)454 static 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
pagetypeinfo_showfree_print(struct seq_file * m,pg_data_t * pgdat,struct zone * zone)461 static 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 }
482 seq_putc(m, '\n');
483 }
484 }
485
486 /* Print out the free pages at each order for each migatetype */
pagetypeinfo_showfree(struct seq_file * m,void * arg)487 static 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
pagetypeinfo_showblockcount_print(struct seq_file * m,pg_data_t * pgdat,struct zone * zone)503 static 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);
519 #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
535 mtype = get_pageblock_migratetype(page);
536
537 if (mtype < MIGRATE_TYPES)
538 count[mtype]++;
539 }
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 */
pagetypeinfo_showblockcount(struct seq_file * m,void * arg)549 static 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 */
pagetypeinfo_show(struct seq_file * m,void * arg)567 static int pagetypeinfo_show(struct seq_file *m, void *arg)
568 {
569 pg_data_t *pgdat = (pg_data_t *)arg;
570
571 /* check memoryless node */
572 if (!node_state(pgdat->node_id, N_HIGH_MEMORY))
573 return 0;
574
575 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
581 return 0;
582 }
583
584 static const struct seq_operations fragmentation_op = {
585 .start = frag_start,
586 .next = frag_next,
587 .stop = frag_stop,
588 .show = frag_show,
589 };
590
fragmentation_open(struct inode * inode,struct file * file)591 static int fragmentation_open(struct inode *inode, struct file *file)
592 {
593 return seq_open(file, &fragmentation_op);
594 }
595
596 static const struct file_operations fragmentation_file_operations = {
597 .open = fragmentation_open,
598 .read = seq_read,
599 .llseek = seq_lseek,
600 .release = seq_release,
601 };
602
603 static const struct seq_operations pagetypeinfo_op = {
604 .start = frag_start,
605 .next = frag_next,
606 .stop = frag_stop,
607 .show = pagetypeinfo_show,
608 };
609
pagetypeinfo_open(struct inode * inode,struct file * file)610 static int pagetypeinfo_open(struct inode *inode, struct file *file)
611 {
612 return seq_open(file, &pagetypeinfo_op);
613 }
614
615 static const struct file_operations pagetypeinfo_file_ops = {
616 .open = pagetypeinfo_open,
617 .read = seq_read,
618 .llseek = seq_lseek,
619 .release = seq_release,
620 };
621
622 #ifdef CONFIG_ZONE_DMA
623 #define TEXT_FOR_DMA(xx) xx "_dma",
624 #else
625 #define TEXT_FOR_DMA(xx)
626 #endif
627
628 #ifdef CONFIG_ZONE_DMA32
629 #define TEXT_FOR_DMA32(xx) xx "_dma32",
630 #else
631 #define TEXT_FOR_DMA32(xx)
632 #endif
633
634 #ifdef CONFIG_HIGHMEM
635 #define TEXT_FOR_HIGHMEM(xx) xx "_high",
636 #else
637 #define TEXT_FOR_HIGHMEM(xx)
638 #endif
639
640 #define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \
641 TEXT_FOR_HIGHMEM(xx) xx "_movable",
642
643 static const char * const vmstat_text[] = {
644 /* Zoned VM counters */
645 "nr_free_pages",
646 "nr_inactive_anon",
647 "nr_active_anon",
648 "nr_inactive_file",
649 "nr_active_file",
650 #ifdef CONFIG_UNEVICTABLE_LRU
651 "nr_unevictable",
652 "nr_mlock",
653 #endif
654 "nr_anon_pages",
655 "nr_mapped",
656 "nr_file_pages",
657 "nr_dirty",
658 "nr_writeback",
659 "nr_slab_reclaimable",
660 "nr_slab_unreclaimable",
661 "nr_page_table_pages",
662 "nr_unstable",
663 "nr_bounce",
664 "nr_vmscan_write",
665 "nr_writeback_temp",
666
667 #ifdef CONFIG_NUMA
668 "numa_hit",
669 "numa_miss",
670 "numa_foreign",
671 "numa_interleave",
672 "numa_local",
673 "numa_other",
674 #endif
675
676 #ifdef CONFIG_VM_EVENT_COUNTERS
677 "pgpgin",
678 "pgpgout",
679 "pswpin",
680 "pswpout",
681
682 TEXTS_FOR_ZONES("pgalloc")
683
684 "pgfree",
685 "pgactivate",
686 "pgdeactivate",
687
688 "pgfault",
689 "pgmajfault",
690
691 TEXTS_FOR_ZONES("pgrefill")
692 TEXTS_FOR_ZONES("pgsteal")
693 TEXTS_FOR_ZONES("pgscan_kswapd")
694 TEXTS_FOR_ZONES("pgscan_direct")
695
696 "pginodesteal",
697 "slabs_scanned",
698 "kswapd_steal",
699 "kswapd_inodesteal",
700 "pageoutrun",
701 "allocstall",
702
703 "pgrotated",
704 #ifdef CONFIG_HUGETLB_PAGE
705 "htlb_buddy_alloc_success",
706 "htlb_buddy_alloc_fail",
707 #endif
708 #ifdef CONFIG_UNEVICTABLE_LRU
709 "unevictable_pgs_culled",
710 "unevictable_pgs_scanned",
711 "unevictable_pgs_rescued",
712 "unevictable_pgs_mlocked",
713 "unevictable_pgs_munlocked",
714 "unevictable_pgs_cleared",
715 "unevictable_pgs_stranded",
716 "unevictable_pgs_mlockfreed",
717 #endif
718 #endif
719 };
720
zoneinfo_show_print(struct seq_file * m,pg_data_t * pgdat,struct zone * zone)721 static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
722 struct zone *zone)
723 {
724 int i;
725 seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name);
726 seq_printf(m,
727 "\n pages free %lu"
728 "\n min %lu"
729 "\n low %lu"
730 "\n high %lu"
731 "\n scanned %lu (aa: %lu ia: %lu af: %lu if: %lu)"
732 "\n spanned %lu"
733 "\n present %lu",
734 zone_page_state(zone, NR_FREE_PAGES),
735 zone->pages_min,
736 zone->pages_low,
737 zone->pages_high,
738 zone->pages_scanned,
739 zone->lru[LRU_ACTIVE_ANON].nr_scan,
740 zone->lru[LRU_INACTIVE_ANON].nr_scan,
741 zone->lru[LRU_ACTIVE_FILE].nr_scan,
742 zone->lru[LRU_INACTIVE_FILE].nr_scan,
743 zone->spanned_pages,
744 zone->present_pages);
745
746 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
747 seq_printf(m, "\n %-12s %lu", vmstat_text[i],
748 zone_page_state(zone, i));
749
750 seq_printf(m,
751 "\n protection: (%lu",
752 zone->lowmem_reserve[0]);
753 for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++)
754 seq_printf(m, ", %lu", zone->lowmem_reserve[i]);
755 seq_printf(m,
756 ")"
757 "\n pagesets");
758 for_each_online_cpu(i) {
759 struct per_cpu_pageset *pageset;
760
761 pageset = zone_pcp(zone, i);
762 seq_printf(m,
763 "\n cpu: %i"
764 "\n count: %i"
765 "\n high: %i"
766 "\n batch: %i",
767 i,
768 pageset->pcp.count,
769 pageset->pcp.high,
770 pageset->pcp.batch);
771 #ifdef CONFIG_SMP
772 seq_printf(m, "\n vm stats threshold: %d",
773 pageset->stat_threshold);
774 #endif
775 }
776 seq_printf(m,
777 "\n all_unreclaimable: %u"
778 "\n prev_priority: %i"
779 "\n start_pfn: %lu"
780 "\n inactive_ratio: %u",
781 zone_is_all_unreclaimable(zone),
782 zone->prev_priority,
783 zone->zone_start_pfn,
784 zone->inactive_ratio);
785 seq_putc(m, '\n');
786 }
787
788 /*
789 * Output information about zones in @pgdat.
790 */
zoneinfo_show(struct seq_file * m,void * arg)791 static int zoneinfo_show(struct seq_file *m, void *arg)
792 {
793 pg_data_t *pgdat = (pg_data_t *)arg;
794 walk_zones_in_node(m, pgdat, zoneinfo_show_print);
795 return 0;
796 }
797
798 static const struct seq_operations zoneinfo_op = {
799 .start = frag_start, /* iterate over all zones. The same as in
800 * fragmentation. */
801 .next = frag_next,
802 .stop = frag_stop,
803 .show = zoneinfo_show,
804 };
805
zoneinfo_open(struct inode * inode,struct file * file)806 static int zoneinfo_open(struct inode *inode, struct file *file)
807 {
808 return seq_open(file, &zoneinfo_op);
809 }
810
811 static const struct file_operations proc_zoneinfo_file_operations = {
812 .open = zoneinfo_open,
813 .read = seq_read,
814 .llseek = seq_lseek,
815 .release = seq_release,
816 };
817
vmstat_start(struct seq_file * m,loff_t * pos)818 static void *vmstat_start(struct seq_file *m, loff_t *pos)
819 {
820 unsigned long *v;
821 #ifdef CONFIG_VM_EVENT_COUNTERS
822 unsigned long *e;
823 #endif
824 int i;
825
826 if (*pos >= ARRAY_SIZE(vmstat_text))
827 return NULL;
828
829 #ifdef CONFIG_VM_EVENT_COUNTERS
830 v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long)
831 + sizeof(struct vm_event_state), GFP_KERNEL);
832 #else
833 v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long),
834 GFP_KERNEL);
835 #endif
836 m->private = v;
837 if (!v)
838 return ERR_PTR(-ENOMEM);
839 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
840 v[i] = global_page_state(i);
841 #ifdef CONFIG_VM_EVENT_COUNTERS
842 e = v + NR_VM_ZONE_STAT_ITEMS;
843 all_vm_events(e);
844 e[PGPGIN] /= 2; /* sectors -> kbytes */
845 e[PGPGOUT] /= 2;
846 #endif
847 return v + *pos;
848 }
849
vmstat_next(struct seq_file * m,void * arg,loff_t * pos)850 static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos)
851 {
852 (*pos)++;
853 if (*pos >= ARRAY_SIZE(vmstat_text))
854 return NULL;
855 return (unsigned long *)m->private + *pos;
856 }
857
vmstat_show(struct seq_file * m,void * arg)858 static int vmstat_show(struct seq_file *m, void *arg)
859 {
860 unsigned long *l = arg;
861 unsigned long off = l - (unsigned long *)m->private;
862
863 seq_printf(m, "%s %lu\n", vmstat_text[off], *l);
864 return 0;
865 }
866
vmstat_stop(struct seq_file * m,void * arg)867 static void vmstat_stop(struct seq_file *m, void *arg)
868 {
869 kfree(m->private);
870 m->private = NULL;
871 }
872
873 static const struct seq_operations vmstat_op = {
874 .start = vmstat_start,
875 .next = vmstat_next,
876 .stop = vmstat_stop,
877 .show = vmstat_show,
878 };
879
vmstat_open(struct inode * inode,struct file * file)880 static int vmstat_open(struct inode *inode, struct file *file)
881 {
882 return seq_open(file, &vmstat_op);
883 }
884
885 static const struct file_operations proc_vmstat_file_operations = {
886 .open = vmstat_open,
887 .read = seq_read,
888 .llseek = seq_lseek,
889 .release = seq_release,
890 };
891 #endif /* CONFIG_PROC_FS */
892
893 #ifdef CONFIG_SMP
894 static DEFINE_PER_CPU(struct delayed_work, vmstat_work);
895 int sysctl_stat_interval __read_mostly = HZ;
896
vmstat_update(struct work_struct * w)897 static void vmstat_update(struct work_struct *w)
898 {
899 refresh_cpu_vm_stats(smp_processor_id());
900 schedule_delayed_work(&__get_cpu_var(vmstat_work),
901 sysctl_stat_interval);
902 }
903
start_cpu_timer(int cpu)904 static void __cpuinit start_cpu_timer(int cpu)
905 {
906 struct delayed_work *vmstat_work = &per_cpu(vmstat_work, cpu);
907
908 INIT_DELAYED_WORK_DEFERRABLE(vmstat_work, vmstat_update);
909 schedule_delayed_work_on(cpu, vmstat_work, HZ + cpu);
910 }
911
912 /*
913 * Use the cpu notifier to insure that the thresholds are recalculated
914 * when necessary.
915 */
vmstat_cpuup_callback(struct notifier_block * nfb,unsigned long action,void * hcpu)916 static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb,
917 unsigned long action,
918 void *hcpu)
919 {
920 long cpu = (long)hcpu;
921
922 switch (action) {
923 case CPU_ONLINE:
924 case CPU_ONLINE_FROZEN:
925 start_cpu_timer(cpu);
926 break;
927 case CPU_DOWN_PREPARE:
928 case CPU_DOWN_PREPARE_FROZEN:
929 cancel_rearming_delayed_work(&per_cpu(vmstat_work, cpu));
930 per_cpu(vmstat_work, cpu).work.func = NULL;
931 break;
932 case CPU_DOWN_FAILED:
933 case CPU_DOWN_FAILED_FROZEN:
934 start_cpu_timer(cpu);
935 break;
936 case CPU_DEAD:
937 case CPU_DEAD_FROZEN:
938 refresh_zone_stat_thresholds();
939 break;
940 default:
941 break;
942 }
943 return NOTIFY_OK;
944 }
945
946 static struct notifier_block __cpuinitdata vmstat_notifier =
947 { &vmstat_cpuup_callback, NULL, 0 };
948 #endif
949
setup_vmstat(void)950 static int __init setup_vmstat(void)
951 {
952 #ifdef CONFIG_SMP
953 int cpu;
954
955 refresh_zone_stat_thresholds();
956 register_cpu_notifier(&vmstat_notifier);
957
958 for_each_online_cpu(cpu)
959 start_cpu_timer(cpu);
960 #endif
961 #ifdef CONFIG_PROC_FS
962 proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
963 proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
964 proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
965 proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
966 #endif
967 return 0;
968 }
969 module_init(setup_vmstat)
970