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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 | 10 | */ |
8f32f7e5 | 11 | #include <linux/fs.h> |
f6ac2354 | 12 | #include <linux/mm.h> |
4e950f6f | 13 | #include <linux/err.h> |
2244b95a | 14 | #include <linux/module.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
df9ecaba | 16 | #include <linux/cpu.h> |
c748e134 | 17 | #include <linux/vmstat.h> |
e8edc6e0 | 18 | #include <linux/sched.h> |
f1a5ab12 | 19 | #include <linux/math64.h> |
79da826a | 20 | #include <linux/writeback.h> |
36deb0be | 21 | #include <linux/compaction.h> |
f6ac2354 | 22 | |
f8891e5e CL |
23 | #ifdef CONFIG_VM_EVENT_COUNTERS |
24 | DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}}; | |
25 | EXPORT_PER_CPU_SYMBOL(vm_event_states); | |
26 | ||
31f961a8 | 27 | static void sum_vm_events(unsigned long *ret) |
f8891e5e | 28 | { |
9eccf2a8 | 29 | int cpu; |
f8891e5e CL |
30 | int i; |
31 | ||
32 | memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long)); | |
33 | ||
31f961a8 | 34 | for_each_online_cpu(cpu) { |
f8891e5e CL |
35 | struct vm_event_state *this = &per_cpu(vm_event_states, cpu); |
36 | ||
f8891e5e CL |
37 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) |
38 | ret[i] += this->event[i]; | |
39 | } | |
40 | } | |
41 | ||
42 | /* | |
43 | * Accumulate the vm event counters across all CPUs. | |
44 | * The result is unavoidably approximate - it can change | |
45 | * during and after execution of this function. | |
46 | */ | |
47 | void all_vm_events(unsigned long *ret) | |
48 | { | |
b5be1132 | 49 | get_online_cpus(); |
31f961a8 | 50 | sum_vm_events(ret); |
b5be1132 | 51 | put_online_cpus(); |
f8891e5e | 52 | } |
32dd66fc | 53 | EXPORT_SYMBOL_GPL(all_vm_events); |
f8891e5e CL |
54 | |
55 | #ifdef CONFIG_HOTPLUG | |
56 | /* | |
57 | * Fold the foreign cpu events into our own. | |
58 | * | |
59 | * This is adding to the events on one processor | |
60 | * but keeps the global counts constant. | |
61 | */ | |
62 | void vm_events_fold_cpu(int cpu) | |
63 | { | |
64 | struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu); | |
65 | int i; | |
66 | ||
67 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) { | |
68 | count_vm_events(i, fold_state->event[i]); | |
69 | fold_state->event[i] = 0; | |
70 | } | |
71 | } | |
72 | #endif /* CONFIG_HOTPLUG */ | |
73 | ||
74 | #endif /* CONFIG_VM_EVENT_COUNTERS */ | |
75 | ||
2244b95a CL |
76 | /* |
77 | * Manage combined zone based / global counters | |
78 | * | |
79 | * vm_stat contains the global counters | |
80 | */ | |
81 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; | |
82 | EXPORT_SYMBOL(vm_stat); | |
83 | ||
84 | #ifdef CONFIG_SMP | |
85 | ||
df9ecaba CL |
86 | static int calculate_threshold(struct zone *zone) |
87 | { | |
88 | int threshold; | |
89 | int mem; /* memory in 128 MB units */ | |
90 | ||
91 | /* | |
92 | * The threshold scales with the number of processors and the amount | |
93 | * of memory per zone. More memory means that we can defer updates for | |
94 | * longer, more processors could lead to more contention. | |
95 | * fls() is used to have a cheap way of logarithmic scaling. | |
96 | * | |
97 | * Some sample thresholds: | |
98 | * | |
99 | * Threshold Processors (fls) Zonesize fls(mem+1) | |
100 | * ------------------------------------------------------------------ | |
101 | * 8 1 1 0.9-1 GB 4 | |
102 | * 16 2 2 0.9-1 GB 4 | |
103 | * 20 2 2 1-2 GB 5 | |
104 | * 24 2 2 2-4 GB 6 | |
105 | * 28 2 2 4-8 GB 7 | |
106 | * 32 2 2 8-16 GB 8 | |
107 | * 4 2 2 <128M 1 | |
108 | * 30 4 3 2-4 GB 5 | |
109 | * 48 4 3 8-16 GB 8 | |
110 | * 32 8 4 1-2 GB 4 | |
111 | * 32 8 4 0.9-1GB 4 | |
112 | * 10 16 5 <128M 1 | |
113 | * 40 16 5 900M 4 | |
114 | * 70 64 7 2-4 GB 5 | |
115 | * 84 64 7 4-8 GB 6 | |
116 | * 108 512 9 4-8 GB 6 | |
117 | * 125 1024 10 8-16 GB 8 | |
118 | * 125 1024 10 16-32 GB 9 | |
119 | */ | |
120 | ||
121 | mem = zone->present_pages >> (27 - PAGE_SHIFT); | |
122 | ||
123 | threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem)); | |
124 | ||
125 | /* | |
126 | * Maximum threshold is 125 | |
127 | */ | |
128 | threshold = min(125, threshold); | |
129 | ||
130 | return threshold; | |
131 | } | |
2244b95a CL |
132 | |
133 | /* | |
df9ecaba | 134 | * Refresh the thresholds for each zone. |
2244b95a | 135 | */ |
df9ecaba | 136 | static void refresh_zone_stat_thresholds(void) |
2244b95a | 137 | { |
df9ecaba CL |
138 | struct zone *zone; |
139 | int cpu; | |
140 | int threshold; | |
141 | ||
ee99c71c | 142 | for_each_populated_zone(zone) { |
aa454840 CL |
143 | unsigned long max_drift, tolerate_drift; |
144 | ||
df9ecaba CL |
145 | threshold = calculate_threshold(zone); |
146 | ||
147 | for_each_online_cpu(cpu) | |
99dcc3e5 CL |
148 | per_cpu_ptr(zone->pageset, cpu)->stat_threshold |
149 | = threshold; | |
aa454840 CL |
150 | |
151 | /* | |
152 | * Only set percpu_drift_mark if there is a danger that | |
153 | * NR_FREE_PAGES reports the low watermark is ok when in fact | |
154 | * the min watermark could be breached by an allocation | |
155 | */ | |
156 | tolerate_drift = low_wmark_pages(zone) - min_wmark_pages(zone); | |
157 | max_drift = num_online_cpus() * threshold; | |
158 | if (max_drift > tolerate_drift) | |
159 | zone->percpu_drift_mark = high_wmark_pages(zone) + | |
160 | max_drift; | |
df9ecaba | 161 | } |
2244b95a CL |
162 | } |
163 | ||
164 | /* | |
165 | * For use when we know that interrupts are disabled. | |
166 | */ | |
167 | void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
168 | int delta) | |
169 | { | |
12938a92 CL |
170 | struct per_cpu_pageset __percpu *pcp = zone->pageset; |
171 | s8 __percpu *p = pcp->vm_stat_diff + item; | |
2244b95a | 172 | long x; |
12938a92 CL |
173 | long t; |
174 | ||
175 | x = delta + __this_cpu_read(*p); | |
2244b95a | 176 | |
12938a92 | 177 | t = __this_cpu_read(pcp->stat_threshold); |
2244b95a | 178 | |
12938a92 | 179 | if (unlikely(x > t || x < -t)) { |
2244b95a CL |
180 | zone_page_state_add(x, zone, item); |
181 | x = 0; | |
182 | } | |
12938a92 | 183 | __this_cpu_write(*p, x); |
2244b95a CL |
184 | } |
185 | EXPORT_SYMBOL(__mod_zone_page_state); | |
186 | ||
187 | /* | |
188 | * For an unknown interrupt state | |
189 | */ | |
190 | void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, | |
191 | int delta) | |
192 | { | |
193 | unsigned long flags; | |
194 | ||
195 | local_irq_save(flags); | |
196 | __mod_zone_page_state(zone, item, delta); | |
197 | local_irq_restore(flags); | |
198 | } | |
199 | EXPORT_SYMBOL(mod_zone_page_state); | |
200 | ||
201 | /* | |
202 | * Optimized increment and decrement functions. | |
203 | * | |
204 | * These are only for a single page and therefore can take a struct page * | |
205 | * argument instead of struct zone *. This allows the inclusion of the code | |
206 | * generated for page_zone(page) into the optimized functions. | |
207 | * | |
208 | * No overflow check is necessary and therefore the differential can be | |
209 | * incremented or decremented in place which may allow the compilers to | |
210 | * generate better code. | |
2244b95a CL |
211 | * The increment or decrement is known and therefore one boundary check can |
212 | * be omitted. | |
213 | * | |
df9ecaba CL |
214 | * NOTE: These functions are very performance sensitive. Change only |
215 | * with care. | |
216 | * | |
2244b95a CL |
217 | * Some processors have inc/dec instructions that are atomic vs an interrupt. |
218 | * However, the code must first determine the differential location in a zone | |
219 | * based on the processor number and then inc/dec the counter. There is no | |
220 | * guarantee without disabling preemption that the processor will not change | |
221 | * in between and therefore the atomicity vs. interrupt cannot be exploited | |
222 | * in a useful way here. | |
223 | */ | |
c8785385 | 224 | void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 225 | { |
12938a92 CL |
226 | struct per_cpu_pageset __percpu *pcp = zone->pageset; |
227 | s8 __percpu *p = pcp->vm_stat_diff + item; | |
228 | s8 v, t; | |
2244b95a | 229 | |
12938a92 | 230 | __this_cpu_inc(*p); |
2244b95a | 231 | |
12938a92 CL |
232 | v = __this_cpu_read(*p); |
233 | t = __this_cpu_read(pcp->stat_threshold); | |
234 | if (unlikely(v > t)) { | |
235 | s8 overstep = t >> 1; | |
df9ecaba | 236 | |
12938a92 CL |
237 | zone_page_state_add(v + overstep, zone, item); |
238 | __this_cpu_write(*p, -overstep); | |
2244b95a CL |
239 | } |
240 | } | |
ca889e6c CL |
241 | |
242 | void __inc_zone_page_state(struct page *page, enum zone_stat_item item) | |
243 | { | |
244 | __inc_zone_state(page_zone(page), item); | |
245 | } | |
2244b95a CL |
246 | EXPORT_SYMBOL(__inc_zone_page_state); |
247 | ||
c8785385 | 248 | void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
2244b95a | 249 | { |
12938a92 CL |
250 | struct per_cpu_pageset __percpu *pcp = zone->pageset; |
251 | s8 __percpu *p = pcp->vm_stat_diff + item; | |
252 | s8 v, t; | |
2244b95a | 253 | |
12938a92 | 254 | __this_cpu_dec(*p); |
2244b95a | 255 | |
12938a92 CL |
256 | v = __this_cpu_read(*p); |
257 | t = __this_cpu_read(pcp->stat_threshold); | |
258 | if (unlikely(v < - t)) { | |
259 | s8 overstep = t >> 1; | |
df9ecaba | 260 | |
12938a92 CL |
261 | zone_page_state_add(v - overstep, zone, item); |
262 | __this_cpu_write(*p, overstep); | |
2244b95a CL |
263 | } |
264 | } | |
c8785385 CL |
265 | |
266 | void __dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
267 | { | |
268 | __dec_zone_state(page_zone(page), item); | |
269 | } | |
2244b95a CL |
270 | EXPORT_SYMBOL(__dec_zone_page_state); |
271 | ||
ca889e6c CL |
272 | void inc_zone_state(struct zone *zone, enum zone_stat_item item) |
273 | { | |
274 | unsigned long flags; | |
275 | ||
276 | local_irq_save(flags); | |
277 | __inc_zone_state(zone, item); | |
278 | local_irq_restore(flags); | |
279 | } | |
280 | ||
2244b95a CL |
281 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
282 | { | |
283 | unsigned long flags; | |
284 | struct zone *zone; | |
2244b95a CL |
285 | |
286 | zone = page_zone(page); | |
287 | local_irq_save(flags); | |
ca889e6c | 288 | __inc_zone_state(zone, item); |
2244b95a CL |
289 | local_irq_restore(flags); |
290 | } | |
291 | EXPORT_SYMBOL(inc_zone_page_state); | |
292 | ||
293 | void dec_zone_page_state(struct page *page, enum zone_stat_item item) | |
294 | { | |
295 | unsigned long flags; | |
2244b95a | 296 | |
2244b95a | 297 | local_irq_save(flags); |
a302eb4e | 298 | __dec_zone_page_state(page, item); |
2244b95a CL |
299 | local_irq_restore(flags); |
300 | } | |
301 | EXPORT_SYMBOL(dec_zone_page_state); | |
302 | ||
303 | /* | |
304 | * Update the zone counters for one cpu. | |
4037d452 | 305 | * |
a7f75e25 CL |
306 | * The cpu specified must be either the current cpu or a processor that |
307 | * is not online. If it is the current cpu then the execution thread must | |
308 | * be pinned to the current cpu. | |
309 | * | |
4037d452 CL |
310 | * Note that refresh_cpu_vm_stats strives to only access |
311 | * node local memory. The per cpu pagesets on remote zones are placed | |
312 | * in the memory local to the processor using that pageset. So the | |
313 | * loop over all zones will access a series of cachelines local to | |
314 | * the processor. | |
315 | * | |
316 | * The call to zone_page_state_add updates the cachelines with the | |
317 | * statistics in the remote zone struct as well as the global cachelines | |
318 | * with the global counters. These could cause remote node cache line | |
319 | * bouncing and will have to be only done when necessary. | |
2244b95a CL |
320 | */ |
321 | void refresh_cpu_vm_stats(int cpu) | |
322 | { | |
323 | struct zone *zone; | |
324 | int i; | |
a7f75e25 | 325 | int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, }; |
2244b95a | 326 | |
ee99c71c | 327 | for_each_populated_zone(zone) { |
4037d452 | 328 | struct per_cpu_pageset *p; |
2244b95a | 329 | |
99dcc3e5 | 330 | p = per_cpu_ptr(zone->pageset, cpu); |
2244b95a CL |
331 | |
332 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
4037d452 | 333 | if (p->vm_stat_diff[i]) { |
a7f75e25 CL |
334 | unsigned long flags; |
335 | int v; | |
336 | ||
2244b95a | 337 | local_irq_save(flags); |
a7f75e25 | 338 | v = p->vm_stat_diff[i]; |
4037d452 | 339 | p->vm_stat_diff[i] = 0; |
a7f75e25 CL |
340 | local_irq_restore(flags); |
341 | atomic_long_add(v, &zone->vm_stat[i]); | |
342 | global_diff[i] += v; | |
4037d452 CL |
343 | #ifdef CONFIG_NUMA |
344 | /* 3 seconds idle till flush */ | |
345 | p->expire = 3; | |
346 | #endif | |
2244b95a | 347 | } |
468fd62e | 348 | cond_resched(); |
4037d452 CL |
349 | #ifdef CONFIG_NUMA |
350 | /* | |
351 | * Deal with draining the remote pageset of this | |
352 | * processor | |
353 | * | |
354 | * Check if there are pages remaining in this pageset | |
355 | * if not then there is nothing to expire. | |
356 | */ | |
3dfa5721 | 357 | if (!p->expire || !p->pcp.count) |
4037d452 CL |
358 | continue; |
359 | ||
360 | /* | |
361 | * We never drain zones local to this processor. | |
362 | */ | |
363 | if (zone_to_nid(zone) == numa_node_id()) { | |
364 | p->expire = 0; | |
365 | continue; | |
366 | } | |
367 | ||
368 | p->expire--; | |
369 | if (p->expire) | |
370 | continue; | |
371 | ||
3dfa5721 CL |
372 | if (p->pcp.count) |
373 | drain_zone_pages(zone, &p->pcp); | |
4037d452 | 374 | #endif |
2244b95a | 375 | } |
a7f75e25 CL |
376 | |
377 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
378 | if (global_diff[i]) | |
379 | atomic_long_add(global_diff[i], &vm_stat[i]); | |
2244b95a CL |
380 | } |
381 | ||
2244b95a CL |
382 | #endif |
383 | ||
ca889e6c CL |
384 | #ifdef CONFIG_NUMA |
385 | /* | |
386 | * zonelist = the list of zones passed to the allocator | |
387 | * z = the zone from which the allocation occurred. | |
388 | * | |
389 | * Must be called with interrupts disabled. | |
390 | */ | |
18ea7e71 | 391 | void zone_statistics(struct zone *preferred_zone, struct zone *z) |
ca889e6c | 392 | { |
18ea7e71 | 393 | if (z->zone_pgdat == preferred_zone->zone_pgdat) { |
ca889e6c CL |
394 | __inc_zone_state(z, NUMA_HIT); |
395 | } else { | |
396 | __inc_zone_state(z, NUMA_MISS); | |
18ea7e71 | 397 | __inc_zone_state(preferred_zone, NUMA_FOREIGN); |
ca889e6c | 398 | } |
5d292343 | 399 | if (z->node == numa_node_id()) |
ca889e6c CL |
400 | __inc_zone_state(z, NUMA_LOCAL); |
401 | else | |
402 | __inc_zone_state(z, NUMA_OTHER); | |
403 | } | |
404 | #endif | |
405 | ||
d7a5752c | 406 | #ifdef CONFIG_COMPACTION |
36deb0be | 407 | |
d7a5752c MG |
408 | struct contig_page_info { |
409 | unsigned long free_pages; | |
410 | unsigned long free_blocks_total; | |
411 | unsigned long free_blocks_suitable; | |
412 | }; | |
413 | ||
414 | /* | |
415 | * Calculate the number of free pages in a zone, how many contiguous | |
416 | * pages are free and how many are large enough to satisfy an allocation of | |
417 | * the target size. Note that this function makes no attempt to estimate | |
418 | * how many suitable free blocks there *might* be if MOVABLE pages were | |
419 | * migrated. Calculating that is possible, but expensive and can be | |
420 | * figured out from userspace | |
421 | */ | |
422 | static void fill_contig_page_info(struct zone *zone, | |
423 | unsigned int suitable_order, | |
424 | struct contig_page_info *info) | |
425 | { | |
426 | unsigned int order; | |
427 | ||
428 | info->free_pages = 0; | |
429 | info->free_blocks_total = 0; | |
430 | info->free_blocks_suitable = 0; | |
431 | ||
432 | for (order = 0; order < MAX_ORDER; order++) { | |
433 | unsigned long blocks; | |
434 | ||
435 | /* Count number of free blocks */ | |
436 | blocks = zone->free_area[order].nr_free; | |
437 | info->free_blocks_total += blocks; | |
438 | ||
439 | /* Count free base pages */ | |
440 | info->free_pages += blocks << order; | |
441 | ||
442 | /* Count the suitable free blocks */ | |
443 | if (order >= suitable_order) | |
444 | info->free_blocks_suitable += blocks << | |
445 | (order - suitable_order); | |
446 | } | |
447 | } | |
f1a5ab12 MG |
448 | |
449 | /* | |
450 | * A fragmentation index only makes sense if an allocation of a requested | |
451 | * size would fail. If that is true, the fragmentation index indicates | |
452 | * whether external fragmentation or a lack of memory was the problem. | |
453 | * The value can be used to determine if page reclaim or compaction | |
454 | * should be used | |
455 | */ | |
56de7263 | 456 | static int __fragmentation_index(unsigned int order, struct contig_page_info *info) |
f1a5ab12 MG |
457 | { |
458 | unsigned long requested = 1UL << order; | |
459 | ||
460 | if (!info->free_blocks_total) | |
461 | return 0; | |
462 | ||
463 | /* Fragmentation index only makes sense when a request would fail */ | |
464 | if (info->free_blocks_suitable) | |
465 | return -1000; | |
466 | ||
467 | /* | |
468 | * Index is between 0 and 1 so return within 3 decimal places | |
469 | * | |
470 | * 0 => allocation would fail due to lack of memory | |
471 | * 1 => allocation would fail due to fragmentation | |
472 | */ | |
473 | return 1000 - div_u64( (1000+(div_u64(info->free_pages * 1000ULL, requested))), info->free_blocks_total); | |
474 | } | |
56de7263 MG |
475 | |
476 | /* Same as __fragmentation index but allocs contig_page_info on stack */ | |
477 | int fragmentation_index(struct zone *zone, unsigned int order) | |
478 | { | |
479 | struct contig_page_info info; | |
480 | ||
481 | fill_contig_page_info(zone, order, &info); | |
482 | return __fragmentation_index(order, &info); | |
483 | } | |
d7a5752c MG |
484 | #endif |
485 | ||
486 | #if defined(CONFIG_PROC_FS) || defined(CONFIG_COMPACTION) | |
8f32f7e5 | 487 | #include <linux/proc_fs.h> |
f6ac2354 CL |
488 | #include <linux/seq_file.h> |
489 | ||
467c996c MG |
490 | static char * const migratetype_names[MIGRATE_TYPES] = { |
491 | "Unmovable", | |
492 | "Reclaimable", | |
493 | "Movable", | |
494 | "Reserve", | |
91446b06 | 495 | "Isolate", |
467c996c MG |
496 | }; |
497 | ||
f6ac2354 CL |
498 | static void *frag_start(struct seq_file *m, loff_t *pos) |
499 | { | |
500 | pg_data_t *pgdat; | |
501 | loff_t node = *pos; | |
502 | for (pgdat = first_online_pgdat(); | |
503 | pgdat && node; | |
504 | pgdat = next_online_pgdat(pgdat)) | |
505 | --node; | |
506 | ||
507 | return pgdat; | |
508 | } | |
509 | ||
510 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) | |
511 | { | |
512 | pg_data_t *pgdat = (pg_data_t *)arg; | |
513 | ||
514 | (*pos)++; | |
515 | return next_online_pgdat(pgdat); | |
516 | } | |
517 | ||
518 | static void frag_stop(struct seq_file *m, void *arg) | |
519 | { | |
520 | } | |
521 | ||
467c996c MG |
522 | /* Walk all the zones in a node and print using a callback */ |
523 | static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat, | |
524 | void (*print)(struct seq_file *m, pg_data_t *, struct zone *)) | |
f6ac2354 | 525 | { |
f6ac2354 CL |
526 | struct zone *zone; |
527 | struct zone *node_zones = pgdat->node_zones; | |
528 | unsigned long flags; | |
f6ac2354 CL |
529 | |
530 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { | |
531 | if (!populated_zone(zone)) | |
532 | continue; | |
533 | ||
534 | spin_lock_irqsave(&zone->lock, flags); | |
467c996c | 535 | print(m, pgdat, zone); |
f6ac2354 | 536 | spin_unlock_irqrestore(&zone->lock, flags); |
467c996c MG |
537 | } |
538 | } | |
d7a5752c | 539 | #endif |
467c996c | 540 | |
d7a5752c | 541 | #ifdef CONFIG_PROC_FS |
467c996c MG |
542 | static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, |
543 | struct zone *zone) | |
544 | { | |
545 | int order; | |
546 | ||
547 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
548 | for (order = 0; order < MAX_ORDER; ++order) | |
549 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); | |
550 | seq_putc(m, '\n'); | |
551 | } | |
552 | ||
553 | /* | |
554 | * This walks the free areas for each zone. | |
555 | */ | |
556 | static int frag_show(struct seq_file *m, void *arg) | |
557 | { | |
558 | pg_data_t *pgdat = (pg_data_t *)arg; | |
559 | walk_zones_in_node(m, pgdat, frag_show_print); | |
560 | return 0; | |
561 | } | |
562 | ||
563 | static void pagetypeinfo_showfree_print(struct seq_file *m, | |
564 | pg_data_t *pgdat, struct zone *zone) | |
565 | { | |
566 | int order, mtype; | |
567 | ||
568 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) { | |
569 | seq_printf(m, "Node %4d, zone %8s, type %12s ", | |
570 | pgdat->node_id, | |
571 | zone->name, | |
572 | migratetype_names[mtype]); | |
573 | for (order = 0; order < MAX_ORDER; ++order) { | |
574 | unsigned long freecount = 0; | |
575 | struct free_area *area; | |
576 | struct list_head *curr; | |
577 | ||
578 | area = &(zone->free_area[order]); | |
579 | ||
580 | list_for_each(curr, &area->free_list[mtype]) | |
581 | freecount++; | |
582 | seq_printf(m, "%6lu ", freecount); | |
583 | } | |
f6ac2354 CL |
584 | seq_putc(m, '\n'); |
585 | } | |
467c996c MG |
586 | } |
587 | ||
588 | /* Print out the free pages at each order for each migatetype */ | |
589 | static int pagetypeinfo_showfree(struct seq_file *m, void *arg) | |
590 | { | |
591 | int order; | |
592 | pg_data_t *pgdat = (pg_data_t *)arg; | |
593 | ||
594 | /* Print header */ | |
595 | seq_printf(m, "%-43s ", "Free pages count per migrate type at order"); | |
596 | for (order = 0; order < MAX_ORDER; ++order) | |
597 | seq_printf(m, "%6d ", order); | |
598 | seq_putc(m, '\n'); | |
599 | ||
600 | walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print); | |
601 | ||
602 | return 0; | |
603 | } | |
604 | ||
605 | static void pagetypeinfo_showblockcount_print(struct seq_file *m, | |
606 | pg_data_t *pgdat, struct zone *zone) | |
607 | { | |
608 | int mtype; | |
609 | unsigned long pfn; | |
610 | unsigned long start_pfn = zone->zone_start_pfn; | |
611 | unsigned long end_pfn = start_pfn + zone->spanned_pages; | |
612 | unsigned long count[MIGRATE_TYPES] = { 0, }; | |
613 | ||
614 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { | |
615 | struct page *page; | |
616 | ||
617 | if (!pfn_valid(pfn)) | |
618 | continue; | |
619 | ||
620 | page = pfn_to_page(pfn); | |
eb33575c MG |
621 | |
622 | /* Watch for unexpected holes punched in the memmap */ | |
623 | if (!memmap_valid_within(pfn, page, zone)) | |
e80d6a24 | 624 | continue; |
eb33575c | 625 | |
467c996c MG |
626 | mtype = get_pageblock_migratetype(page); |
627 | ||
e80d6a24 MG |
628 | if (mtype < MIGRATE_TYPES) |
629 | count[mtype]++; | |
467c996c MG |
630 | } |
631 | ||
632 | /* Print counts */ | |
633 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
634 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) | |
635 | seq_printf(m, "%12lu ", count[mtype]); | |
636 | seq_putc(m, '\n'); | |
637 | } | |
638 | ||
639 | /* Print out the free pages at each order for each migratetype */ | |
640 | static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg) | |
641 | { | |
642 | int mtype; | |
643 | pg_data_t *pgdat = (pg_data_t *)arg; | |
644 | ||
645 | seq_printf(m, "\n%-23s", "Number of blocks type "); | |
646 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) | |
647 | seq_printf(m, "%12s ", migratetype_names[mtype]); | |
648 | seq_putc(m, '\n'); | |
649 | walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print); | |
650 | ||
651 | return 0; | |
652 | } | |
653 | ||
654 | /* | |
655 | * This prints out statistics in relation to grouping pages by mobility. | |
656 | * It is expensive to collect so do not constantly read the file. | |
657 | */ | |
658 | static int pagetypeinfo_show(struct seq_file *m, void *arg) | |
659 | { | |
660 | pg_data_t *pgdat = (pg_data_t *)arg; | |
661 | ||
41b25a37 KM |
662 | /* check memoryless node */ |
663 | if (!node_state(pgdat->node_id, N_HIGH_MEMORY)) | |
664 | return 0; | |
665 | ||
467c996c MG |
666 | seq_printf(m, "Page block order: %d\n", pageblock_order); |
667 | seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages); | |
668 | seq_putc(m, '\n'); | |
669 | pagetypeinfo_showfree(m, pgdat); | |
670 | pagetypeinfo_showblockcount(m, pgdat); | |
671 | ||
f6ac2354 CL |
672 | return 0; |
673 | } | |
674 | ||
8f32f7e5 | 675 | static const struct seq_operations fragmentation_op = { |
f6ac2354 CL |
676 | .start = frag_start, |
677 | .next = frag_next, | |
678 | .stop = frag_stop, | |
679 | .show = frag_show, | |
680 | }; | |
681 | ||
8f32f7e5 AD |
682 | static int fragmentation_open(struct inode *inode, struct file *file) |
683 | { | |
684 | return seq_open(file, &fragmentation_op); | |
685 | } | |
686 | ||
687 | static const struct file_operations fragmentation_file_operations = { | |
688 | .open = fragmentation_open, | |
689 | .read = seq_read, | |
690 | .llseek = seq_lseek, | |
691 | .release = seq_release, | |
692 | }; | |
693 | ||
74e2e8e8 | 694 | static const struct seq_operations pagetypeinfo_op = { |
467c996c MG |
695 | .start = frag_start, |
696 | .next = frag_next, | |
697 | .stop = frag_stop, | |
698 | .show = pagetypeinfo_show, | |
699 | }; | |
700 | ||
74e2e8e8 AD |
701 | static int pagetypeinfo_open(struct inode *inode, struct file *file) |
702 | { | |
703 | return seq_open(file, &pagetypeinfo_op); | |
704 | } | |
705 | ||
706 | static const struct file_operations pagetypeinfo_file_ops = { | |
707 | .open = pagetypeinfo_open, | |
708 | .read = seq_read, | |
709 | .llseek = seq_lseek, | |
710 | .release = seq_release, | |
711 | }; | |
712 | ||
4b51d669 CL |
713 | #ifdef CONFIG_ZONE_DMA |
714 | #define TEXT_FOR_DMA(xx) xx "_dma", | |
715 | #else | |
716 | #define TEXT_FOR_DMA(xx) | |
717 | #endif | |
718 | ||
27bf71c2 CL |
719 | #ifdef CONFIG_ZONE_DMA32 |
720 | #define TEXT_FOR_DMA32(xx) xx "_dma32", | |
721 | #else | |
722 | #define TEXT_FOR_DMA32(xx) | |
723 | #endif | |
724 | ||
725 | #ifdef CONFIG_HIGHMEM | |
726 | #define TEXT_FOR_HIGHMEM(xx) xx "_high", | |
727 | #else | |
728 | #define TEXT_FOR_HIGHMEM(xx) | |
729 | #endif | |
730 | ||
4b51d669 | 731 | #define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \ |
2a1e274a | 732 | TEXT_FOR_HIGHMEM(xx) xx "_movable", |
27bf71c2 | 733 | |
15ad7cdc | 734 | static const char * const vmstat_text[] = { |
2244b95a | 735 | /* Zoned VM counters */ |
d23ad423 | 736 | "nr_free_pages", |
4f98a2fe RR |
737 | "nr_inactive_anon", |
738 | "nr_active_anon", | |
739 | "nr_inactive_file", | |
740 | "nr_active_file", | |
7b854121 | 741 | "nr_unevictable", |
5344b7e6 | 742 | "nr_mlock", |
f3dbd344 | 743 | "nr_anon_pages", |
65ba55f5 | 744 | "nr_mapped", |
347ce434 | 745 | "nr_file_pages", |
51ed4491 CL |
746 | "nr_dirty", |
747 | "nr_writeback", | |
972d1a7b CL |
748 | "nr_slab_reclaimable", |
749 | "nr_slab_unreclaimable", | |
df849a15 | 750 | "nr_page_table_pages", |
c6a7f572 | 751 | "nr_kernel_stack", |
f6ac2354 | 752 | "nr_unstable", |
d2c5e30c | 753 | "nr_bounce", |
e129b5c2 | 754 | "nr_vmscan_write", |
fc3ba692 | 755 | "nr_writeback_temp", |
a731286d KM |
756 | "nr_isolated_anon", |
757 | "nr_isolated_file", | |
4b02108a | 758 | "nr_shmem", |
ea941f0e MR |
759 | "nr_dirtied", |
760 | "nr_written", | |
761 | ||
ca889e6c CL |
762 | #ifdef CONFIG_NUMA |
763 | "numa_hit", | |
764 | "numa_miss", | |
765 | "numa_foreign", | |
766 | "numa_interleave", | |
767 | "numa_local", | |
768 | "numa_other", | |
769 | #endif | |
e172662d WF |
770 | "nr_dirty_threshold", |
771 | "nr_dirty_background_threshold", | |
ca889e6c | 772 | |
f8891e5e | 773 | #ifdef CONFIG_VM_EVENT_COUNTERS |
f6ac2354 CL |
774 | "pgpgin", |
775 | "pgpgout", | |
776 | "pswpin", | |
777 | "pswpout", | |
778 | ||
27bf71c2 | 779 | TEXTS_FOR_ZONES("pgalloc") |
f6ac2354 CL |
780 | |
781 | "pgfree", | |
782 | "pgactivate", | |
783 | "pgdeactivate", | |
784 | ||
785 | "pgfault", | |
786 | "pgmajfault", | |
787 | ||
27bf71c2 CL |
788 | TEXTS_FOR_ZONES("pgrefill") |
789 | TEXTS_FOR_ZONES("pgsteal") | |
790 | TEXTS_FOR_ZONES("pgscan_kswapd") | |
791 | TEXTS_FOR_ZONES("pgscan_direct") | |
f6ac2354 | 792 | |
24cf7251 MG |
793 | #ifdef CONFIG_NUMA |
794 | "zone_reclaim_failed", | |
795 | #endif | |
f6ac2354 CL |
796 | "pginodesteal", |
797 | "slabs_scanned", | |
798 | "kswapd_steal", | |
799 | "kswapd_inodesteal", | |
bb3ab596 KM |
800 | "kswapd_low_wmark_hit_quickly", |
801 | "kswapd_high_wmark_hit_quickly", | |
802 | "kswapd_skip_congestion_wait", | |
f6ac2354 CL |
803 | "pageoutrun", |
804 | "allocstall", | |
805 | ||
806 | "pgrotated", | |
748446bb MG |
807 | |
808 | #ifdef CONFIG_COMPACTION | |
809 | "compact_blocks_moved", | |
810 | "compact_pages_moved", | |
811 | "compact_pagemigrate_failed", | |
56de7263 MG |
812 | "compact_stall", |
813 | "compact_fail", | |
814 | "compact_success", | |
748446bb MG |
815 | #endif |
816 | ||
3b116300 AL |
817 | #ifdef CONFIG_HUGETLB_PAGE |
818 | "htlb_buddy_alloc_success", | |
819 | "htlb_buddy_alloc_fail", | |
820 | #endif | |
bbfd28ee LS |
821 | "unevictable_pgs_culled", |
822 | "unevictable_pgs_scanned", | |
823 | "unevictable_pgs_rescued", | |
5344b7e6 NP |
824 | "unevictable_pgs_mlocked", |
825 | "unevictable_pgs_munlocked", | |
826 | "unevictable_pgs_cleared", | |
827 | "unevictable_pgs_stranded", | |
985737cf | 828 | "unevictable_pgs_mlockfreed", |
bbfd28ee | 829 | #endif |
f6ac2354 CL |
830 | }; |
831 | ||
467c996c MG |
832 | static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, |
833 | struct zone *zone) | |
f6ac2354 | 834 | { |
467c996c MG |
835 | int i; |
836 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); | |
837 | seq_printf(m, | |
838 | "\n pages free %lu" | |
839 | "\n min %lu" | |
840 | "\n low %lu" | |
841 | "\n high %lu" | |
08d9ae7c | 842 | "\n scanned %lu" |
467c996c MG |
843 | "\n spanned %lu" |
844 | "\n present %lu", | |
aa454840 | 845 | zone_nr_free_pages(zone), |
41858966 MG |
846 | min_wmark_pages(zone), |
847 | low_wmark_pages(zone), | |
848 | high_wmark_pages(zone), | |
467c996c | 849 | zone->pages_scanned, |
467c996c MG |
850 | zone->spanned_pages, |
851 | zone->present_pages); | |
852 | ||
853 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) | |
854 | seq_printf(m, "\n %-12s %lu", vmstat_text[i], | |
855 | zone_page_state(zone, i)); | |
856 | ||
857 | seq_printf(m, | |
858 | "\n protection: (%lu", | |
859 | zone->lowmem_reserve[0]); | |
860 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) | |
861 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); | |
862 | seq_printf(m, | |
863 | ")" | |
864 | "\n pagesets"); | |
865 | for_each_online_cpu(i) { | |
866 | struct per_cpu_pageset *pageset; | |
467c996c | 867 | |
99dcc3e5 | 868 | pageset = per_cpu_ptr(zone->pageset, i); |
3dfa5721 CL |
869 | seq_printf(m, |
870 | "\n cpu: %i" | |
871 | "\n count: %i" | |
872 | "\n high: %i" | |
873 | "\n batch: %i", | |
874 | i, | |
875 | pageset->pcp.count, | |
876 | pageset->pcp.high, | |
877 | pageset->pcp.batch); | |
df9ecaba | 878 | #ifdef CONFIG_SMP |
467c996c MG |
879 | seq_printf(m, "\n vm stats threshold: %d", |
880 | pageset->stat_threshold); | |
df9ecaba | 881 | #endif |
f6ac2354 | 882 | } |
467c996c MG |
883 | seq_printf(m, |
884 | "\n all_unreclaimable: %u" | |
556adecb RR |
885 | "\n start_pfn: %lu" |
886 | "\n inactive_ratio: %u", | |
93e4a89a | 887 | zone->all_unreclaimable, |
556adecb RR |
888 | zone->zone_start_pfn, |
889 | zone->inactive_ratio); | |
467c996c MG |
890 | seq_putc(m, '\n'); |
891 | } | |
892 | ||
893 | /* | |
894 | * Output information about zones in @pgdat. | |
895 | */ | |
896 | static int zoneinfo_show(struct seq_file *m, void *arg) | |
897 | { | |
898 | pg_data_t *pgdat = (pg_data_t *)arg; | |
899 | walk_zones_in_node(m, pgdat, zoneinfo_show_print); | |
f6ac2354 CL |
900 | return 0; |
901 | } | |
902 | ||
5c9fe628 | 903 | static const struct seq_operations zoneinfo_op = { |
f6ac2354 CL |
904 | .start = frag_start, /* iterate over all zones. The same as in |
905 | * fragmentation. */ | |
906 | .next = frag_next, | |
907 | .stop = frag_stop, | |
908 | .show = zoneinfo_show, | |
909 | }; | |
910 | ||
5c9fe628 AD |
911 | static int zoneinfo_open(struct inode *inode, struct file *file) |
912 | { | |
913 | return seq_open(file, &zoneinfo_op); | |
914 | } | |
915 | ||
916 | static const struct file_operations proc_zoneinfo_file_operations = { | |
917 | .open = zoneinfo_open, | |
918 | .read = seq_read, | |
919 | .llseek = seq_lseek, | |
920 | .release = seq_release, | |
921 | }; | |
922 | ||
79da826a MR |
923 | enum writeback_stat_item { |
924 | NR_DIRTY_THRESHOLD, | |
925 | NR_DIRTY_BG_THRESHOLD, | |
926 | NR_VM_WRITEBACK_STAT_ITEMS, | |
927 | }; | |
928 | ||
f6ac2354 CL |
929 | static void *vmstat_start(struct seq_file *m, loff_t *pos) |
930 | { | |
2244b95a | 931 | unsigned long *v; |
79da826a | 932 | int i, stat_items_size; |
f6ac2354 CL |
933 | |
934 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
935 | return NULL; | |
79da826a MR |
936 | stat_items_size = NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) + |
937 | NR_VM_WRITEBACK_STAT_ITEMS * sizeof(unsigned long); | |
f6ac2354 | 938 | |
f8891e5e | 939 | #ifdef CONFIG_VM_EVENT_COUNTERS |
79da826a | 940 | stat_items_size += sizeof(struct vm_event_state); |
f8891e5e | 941 | #endif |
79da826a MR |
942 | |
943 | v = kmalloc(stat_items_size, GFP_KERNEL); | |
2244b95a CL |
944 | m->private = v; |
945 | if (!v) | |
f6ac2354 | 946 | return ERR_PTR(-ENOMEM); |
2244b95a CL |
947 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
948 | v[i] = global_page_state(i); | |
79da826a MR |
949 | v += NR_VM_ZONE_STAT_ITEMS; |
950 | ||
951 | global_dirty_limits(v + NR_DIRTY_BG_THRESHOLD, | |
952 | v + NR_DIRTY_THRESHOLD); | |
953 | v += NR_VM_WRITEBACK_STAT_ITEMS; | |
954 | ||
f8891e5e | 955 | #ifdef CONFIG_VM_EVENT_COUNTERS |
79da826a MR |
956 | all_vm_events(v); |
957 | v[PGPGIN] /= 2; /* sectors -> kbytes */ | |
958 | v[PGPGOUT] /= 2; | |
f8891e5e | 959 | #endif |
ff8b16d7 | 960 | return (unsigned long *)m->private + *pos; |
f6ac2354 CL |
961 | } |
962 | ||
963 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) | |
964 | { | |
965 | (*pos)++; | |
966 | if (*pos >= ARRAY_SIZE(vmstat_text)) | |
967 | return NULL; | |
968 | return (unsigned long *)m->private + *pos; | |
969 | } | |
970 | ||
971 | static int vmstat_show(struct seq_file *m, void *arg) | |
972 | { | |
973 | unsigned long *l = arg; | |
974 | unsigned long off = l - (unsigned long *)m->private; | |
975 | ||
976 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); | |
977 | return 0; | |
978 | } | |
979 | ||
980 | static void vmstat_stop(struct seq_file *m, void *arg) | |
981 | { | |
982 | kfree(m->private); | |
983 | m->private = NULL; | |
984 | } | |
985 | ||
b6aa44ab | 986 | static const struct seq_operations vmstat_op = { |
f6ac2354 CL |
987 | .start = vmstat_start, |
988 | .next = vmstat_next, | |
989 | .stop = vmstat_stop, | |
990 | .show = vmstat_show, | |
991 | }; | |
992 | ||
b6aa44ab AD |
993 | static int vmstat_open(struct inode *inode, struct file *file) |
994 | { | |
995 | return seq_open(file, &vmstat_op); | |
996 | } | |
997 | ||
998 | static const struct file_operations proc_vmstat_file_operations = { | |
999 | .open = vmstat_open, | |
1000 | .read = seq_read, | |
1001 | .llseek = seq_lseek, | |
1002 | .release = seq_release, | |
1003 | }; | |
f6ac2354 CL |
1004 | #endif /* CONFIG_PROC_FS */ |
1005 | ||
df9ecaba | 1006 | #ifdef CONFIG_SMP |
d1187ed2 | 1007 | static DEFINE_PER_CPU(struct delayed_work, vmstat_work); |
77461ab3 | 1008 | int sysctl_stat_interval __read_mostly = HZ; |
d1187ed2 CL |
1009 | |
1010 | static void vmstat_update(struct work_struct *w) | |
1011 | { | |
1012 | refresh_cpu_vm_stats(smp_processor_id()); | |
77461ab3 | 1013 | schedule_delayed_work(&__get_cpu_var(vmstat_work), |
98f4ebb2 | 1014 | round_jiffies_relative(sysctl_stat_interval)); |
d1187ed2 CL |
1015 | } |
1016 | ||
42614fcd | 1017 | static void __cpuinit start_cpu_timer(int cpu) |
d1187ed2 | 1018 | { |
1871e52c | 1019 | struct delayed_work *work = &per_cpu(vmstat_work, cpu); |
d1187ed2 | 1020 | |
1871e52c TH |
1021 | INIT_DELAYED_WORK_DEFERRABLE(work, vmstat_update); |
1022 | schedule_delayed_work_on(cpu, work, __round_jiffies_relative(HZ, cpu)); | |
d1187ed2 CL |
1023 | } |
1024 | ||
df9ecaba CL |
1025 | /* |
1026 | * Use the cpu notifier to insure that the thresholds are recalculated | |
1027 | * when necessary. | |
1028 | */ | |
1029 | static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb, | |
1030 | unsigned long action, | |
1031 | void *hcpu) | |
1032 | { | |
d1187ed2 CL |
1033 | long cpu = (long)hcpu; |
1034 | ||
df9ecaba | 1035 | switch (action) { |
d1187ed2 CL |
1036 | case CPU_ONLINE: |
1037 | case CPU_ONLINE_FROZEN: | |
5ee28a44 | 1038 | refresh_zone_stat_thresholds(); |
d1187ed2 | 1039 | start_cpu_timer(cpu); |
ad596925 | 1040 | node_set_state(cpu_to_node(cpu), N_CPU); |
d1187ed2 CL |
1041 | break; |
1042 | case CPU_DOWN_PREPARE: | |
1043 | case CPU_DOWN_PREPARE_FROZEN: | |
1044 | cancel_rearming_delayed_work(&per_cpu(vmstat_work, cpu)); | |
1045 | per_cpu(vmstat_work, cpu).work.func = NULL; | |
1046 | break; | |
1047 | case CPU_DOWN_FAILED: | |
1048 | case CPU_DOWN_FAILED_FROZEN: | |
1049 | start_cpu_timer(cpu); | |
1050 | break; | |
ce421c79 | 1051 | case CPU_DEAD: |
8bb78442 | 1052 | case CPU_DEAD_FROZEN: |
ce421c79 AW |
1053 | refresh_zone_stat_thresholds(); |
1054 | break; | |
1055 | default: | |
1056 | break; | |
df9ecaba CL |
1057 | } |
1058 | return NOTIFY_OK; | |
1059 | } | |
1060 | ||
1061 | static struct notifier_block __cpuinitdata vmstat_notifier = | |
1062 | { &vmstat_cpuup_callback, NULL, 0 }; | |
8f32f7e5 | 1063 | #endif |
df9ecaba | 1064 | |
e2fc88d0 | 1065 | static int __init setup_vmstat(void) |
df9ecaba | 1066 | { |
8f32f7e5 | 1067 | #ifdef CONFIG_SMP |
d1187ed2 CL |
1068 | int cpu; |
1069 | ||
df9ecaba CL |
1070 | refresh_zone_stat_thresholds(); |
1071 | register_cpu_notifier(&vmstat_notifier); | |
d1187ed2 CL |
1072 | |
1073 | for_each_online_cpu(cpu) | |
1074 | start_cpu_timer(cpu); | |
8f32f7e5 AD |
1075 | #endif |
1076 | #ifdef CONFIG_PROC_FS | |
1077 | proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations); | |
74e2e8e8 | 1078 | proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops); |
b6aa44ab | 1079 | proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations); |
5c9fe628 | 1080 | proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations); |
8f32f7e5 | 1081 | #endif |
df9ecaba CL |
1082 | return 0; |
1083 | } | |
1084 | module_init(setup_vmstat) | |
d7a5752c MG |
1085 | |
1086 | #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_COMPACTION) | |
1087 | #include <linux/debugfs.h> | |
1088 | ||
1089 | static struct dentry *extfrag_debug_root; | |
1090 | ||
1091 | /* | |
1092 | * Return an index indicating how much of the available free memory is | |
1093 | * unusable for an allocation of the requested size. | |
1094 | */ | |
1095 | static int unusable_free_index(unsigned int order, | |
1096 | struct contig_page_info *info) | |
1097 | { | |
1098 | /* No free memory is interpreted as all free memory is unusable */ | |
1099 | if (info->free_pages == 0) | |
1100 | return 1000; | |
1101 | ||
1102 | /* | |
1103 | * Index should be a value between 0 and 1. Return a value to 3 | |
1104 | * decimal places. | |
1105 | * | |
1106 | * 0 => no fragmentation | |
1107 | * 1 => high fragmentation | |
1108 | */ | |
1109 | return div_u64((info->free_pages - (info->free_blocks_suitable << order)) * 1000ULL, info->free_pages); | |
1110 | ||
1111 | } | |
1112 | ||
1113 | static void unusable_show_print(struct seq_file *m, | |
1114 | pg_data_t *pgdat, struct zone *zone) | |
1115 | { | |
1116 | unsigned int order; | |
1117 | int index; | |
1118 | struct contig_page_info info; | |
1119 | ||
1120 | seq_printf(m, "Node %d, zone %8s ", | |
1121 | pgdat->node_id, | |
1122 | zone->name); | |
1123 | for (order = 0; order < MAX_ORDER; ++order) { | |
1124 | fill_contig_page_info(zone, order, &info); | |
1125 | index = unusable_free_index(order, &info); | |
1126 | seq_printf(m, "%d.%03d ", index / 1000, index % 1000); | |
1127 | } | |
1128 | ||
1129 | seq_putc(m, '\n'); | |
1130 | } | |
1131 | ||
1132 | /* | |
1133 | * Display unusable free space index | |
1134 | * | |
1135 | * The unusable free space index measures how much of the available free | |
1136 | * memory cannot be used to satisfy an allocation of a given size and is a | |
1137 | * value between 0 and 1. The higher the value, the more of free memory is | |
1138 | * unusable and by implication, the worse the external fragmentation is. This | |
1139 | * can be expressed as a percentage by multiplying by 100. | |
1140 | */ | |
1141 | static int unusable_show(struct seq_file *m, void *arg) | |
1142 | { | |
1143 | pg_data_t *pgdat = (pg_data_t *)arg; | |
1144 | ||
1145 | /* check memoryless node */ | |
1146 | if (!node_state(pgdat->node_id, N_HIGH_MEMORY)) | |
1147 | return 0; | |
1148 | ||
1149 | walk_zones_in_node(m, pgdat, unusable_show_print); | |
1150 | ||
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | static const struct seq_operations unusable_op = { | |
1155 | .start = frag_start, | |
1156 | .next = frag_next, | |
1157 | .stop = frag_stop, | |
1158 | .show = unusable_show, | |
1159 | }; | |
1160 | ||
1161 | static int unusable_open(struct inode *inode, struct file *file) | |
1162 | { | |
1163 | return seq_open(file, &unusable_op); | |
1164 | } | |
1165 | ||
1166 | static const struct file_operations unusable_file_ops = { | |
1167 | .open = unusable_open, | |
1168 | .read = seq_read, | |
1169 | .llseek = seq_lseek, | |
1170 | .release = seq_release, | |
1171 | }; | |
1172 | ||
f1a5ab12 MG |
1173 | static void extfrag_show_print(struct seq_file *m, |
1174 | pg_data_t *pgdat, struct zone *zone) | |
1175 | { | |
1176 | unsigned int order; | |
1177 | int index; | |
1178 | ||
1179 | /* Alloc on stack as interrupts are disabled for zone walk */ | |
1180 | struct contig_page_info info; | |
1181 | ||
1182 | seq_printf(m, "Node %d, zone %8s ", | |
1183 | pgdat->node_id, | |
1184 | zone->name); | |
1185 | for (order = 0; order < MAX_ORDER; ++order) { | |
1186 | fill_contig_page_info(zone, order, &info); | |
56de7263 | 1187 | index = __fragmentation_index(order, &info); |
f1a5ab12 MG |
1188 | seq_printf(m, "%d.%03d ", index / 1000, index % 1000); |
1189 | } | |
1190 | ||
1191 | seq_putc(m, '\n'); | |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * Display fragmentation index for orders that allocations would fail for | |
1196 | */ | |
1197 | static int extfrag_show(struct seq_file *m, void *arg) | |
1198 | { | |
1199 | pg_data_t *pgdat = (pg_data_t *)arg; | |
1200 | ||
1201 | walk_zones_in_node(m, pgdat, extfrag_show_print); | |
1202 | ||
1203 | return 0; | |
1204 | } | |
1205 | ||
1206 | static const struct seq_operations extfrag_op = { | |
1207 | .start = frag_start, | |
1208 | .next = frag_next, | |
1209 | .stop = frag_stop, | |
1210 | .show = extfrag_show, | |
1211 | }; | |
1212 | ||
1213 | static int extfrag_open(struct inode *inode, struct file *file) | |
1214 | { | |
1215 | return seq_open(file, &extfrag_op); | |
1216 | } | |
1217 | ||
1218 | static const struct file_operations extfrag_file_ops = { | |
1219 | .open = extfrag_open, | |
1220 | .read = seq_read, | |
1221 | .llseek = seq_lseek, | |
1222 | .release = seq_release, | |
1223 | }; | |
1224 | ||
d7a5752c MG |
1225 | static int __init extfrag_debug_init(void) |
1226 | { | |
1227 | extfrag_debug_root = debugfs_create_dir("extfrag", NULL); | |
1228 | if (!extfrag_debug_root) | |
1229 | return -ENOMEM; | |
1230 | ||
1231 | if (!debugfs_create_file("unusable_index", 0444, | |
1232 | extfrag_debug_root, NULL, &unusable_file_ops)) | |
1233 | return -ENOMEM; | |
1234 | ||
f1a5ab12 MG |
1235 | if (!debugfs_create_file("extfrag_index", 0444, |
1236 | extfrag_debug_root, NULL, &extfrag_file_ops)) | |
1237 | return -ENOMEM; | |
1238 | ||
d7a5752c MG |
1239 | return 0; |
1240 | } | |
1241 | ||
1242 | module_init(extfrag_debug_init); | |
1243 | #endif |