Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/mm/vmstat.c |
| 3 | * |
| 4 | * Manages VM statistics |
| 5 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 6 | * |
| 7 | * zoned VM statistics |
| 8 | * Copyright (C) 2006 Silicon Graphics, Inc., |
| 9 | * Christoph Lameter <christoph@lameter.com> |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 10 | */ |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 11 | #include <linux/fs.h> |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 12 | #include <linux/mm.h> |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 13 | #include <linux/err.h> |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 14 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 15 | #include <linux/slab.h> |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 16 | #include <linux/cpu.h> |
Adrian Bunk | c748e13 | 2008-07-23 21:27:03 -0700 | [diff] [blame] | 17 | #include <linux/vmstat.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 18 | #include <linux/sched.h> |
Mel Gorman | f1a5ab1 | 2010-05-24 14:32:26 -0700 | [diff] [blame] | 19 | #include <linux/math64.h> |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 20 | #include <linux/writeback.h> |
Namhyung Kim | 36deb0b | 2010-10-26 14:22:04 -0700 | [diff] [blame] | 21 | #include <linux/compaction.h> |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 22 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 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 | |
Minchan Kim | 31f961a | 2010-08-09 17:18:59 -0700 | [diff] [blame] | 27 | static void sum_vm_events(unsigned long *ret) |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 28 | { |
Christoph Lameter | 9eccf2a | 2008-02-04 22:29:22 -0800 | [diff] [blame] | 29 | int cpu; |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 30 | int i; |
| 31 | |
| 32 | memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long)); |
| 33 | |
Minchan Kim | 31f961a | 2010-08-09 17:18:59 -0700 | [diff] [blame] | 34 | for_each_online_cpu(cpu) { |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 35 | struct vm_event_state *this = &per_cpu(vm_event_states, cpu); |
| 36 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 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 | { |
KOSAKI Motohiro | b5be113 | 2008-05-12 14:02:06 -0700 | [diff] [blame] | 49 | get_online_cpus(); |
Minchan Kim | 31f961a | 2010-08-09 17:18:59 -0700 | [diff] [blame] | 50 | sum_vm_events(ret); |
KOSAKI Motohiro | b5be113 | 2008-05-12 14:02:06 -0700 | [diff] [blame] | 51 | put_online_cpus(); |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 52 | } |
Heiko Carstens | 32dd66f | 2006-07-10 04:44:31 -0700 | [diff] [blame] | 53 | EXPORT_SYMBOL_GPL(all_vm_events); |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 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 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 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 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 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 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 132 | |
| 133 | /* |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 134 | * Refresh the thresholds for each zone. |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 135 | */ |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 136 | static void refresh_zone_stat_thresholds(void) |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 137 | { |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 138 | struct zone *zone; |
| 139 | int cpu; |
| 140 | int threshold; |
| 141 | |
KOSAKI Motohiro | ee99c71 | 2009-03-31 15:19:31 -0700 | [diff] [blame] | 142 | for_each_populated_zone(zone) { |
Christoph Lameter | aa45484 | 2010-09-09 16:38:17 -0700 | [diff] [blame] | 143 | unsigned long max_drift, tolerate_drift; |
| 144 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 145 | threshold = calculate_threshold(zone); |
| 146 | |
| 147 | for_each_online_cpu(cpu) |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 148 | per_cpu_ptr(zone->pageset, cpu)->stat_threshold |
| 149 | = threshold; |
Christoph Lameter | aa45484 | 2010-09-09 16:38:17 -0700 | [diff] [blame] | 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; |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 161 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 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 | { |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 170 | struct per_cpu_pageset *pcp = this_cpu_ptr(zone->pageset); |
| 171 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 172 | s8 *p = pcp->vm_stat_diff + item; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 173 | long x; |
| 174 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 175 | x = delta + *p; |
| 176 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 177 | if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) { |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 178 | zone_page_state_add(x, zone, item); |
| 179 | x = 0; |
| 180 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 181 | *p = x; |
| 182 | } |
| 183 | EXPORT_SYMBOL(__mod_zone_page_state); |
| 184 | |
| 185 | /* |
| 186 | * For an unknown interrupt state |
| 187 | */ |
| 188 | void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, |
| 189 | int delta) |
| 190 | { |
| 191 | unsigned long flags; |
| 192 | |
| 193 | local_irq_save(flags); |
| 194 | __mod_zone_page_state(zone, item, delta); |
| 195 | local_irq_restore(flags); |
| 196 | } |
| 197 | EXPORT_SYMBOL(mod_zone_page_state); |
| 198 | |
| 199 | /* |
| 200 | * Optimized increment and decrement functions. |
| 201 | * |
| 202 | * These are only for a single page and therefore can take a struct page * |
| 203 | * argument instead of struct zone *. This allows the inclusion of the code |
| 204 | * generated for page_zone(page) into the optimized functions. |
| 205 | * |
| 206 | * No overflow check is necessary and therefore the differential can be |
| 207 | * incremented or decremented in place which may allow the compilers to |
| 208 | * generate better code. |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 209 | * The increment or decrement is known and therefore one boundary check can |
| 210 | * be omitted. |
| 211 | * |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 212 | * NOTE: These functions are very performance sensitive. Change only |
| 213 | * with care. |
| 214 | * |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 215 | * Some processors have inc/dec instructions that are atomic vs an interrupt. |
| 216 | * However, the code must first determine the differential location in a zone |
| 217 | * based on the processor number and then inc/dec the counter. There is no |
| 218 | * guarantee without disabling preemption that the processor will not change |
| 219 | * in between and therefore the atomicity vs. interrupt cannot be exploited |
| 220 | * in a useful way here. |
| 221 | */ |
Christoph Lameter | c878538 | 2007-02-10 01:43:01 -0800 | [diff] [blame] | 222 | void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 223 | { |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 224 | struct per_cpu_pageset *pcp = this_cpu_ptr(zone->pageset); |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 225 | s8 *p = pcp->vm_stat_diff + item; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 226 | |
| 227 | (*p)++; |
| 228 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 229 | if (unlikely(*p > pcp->stat_threshold)) { |
| 230 | int overstep = pcp->stat_threshold / 2; |
| 231 | |
| 232 | zone_page_state_add(*p + overstep, zone, item); |
| 233 | *p = -overstep; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 234 | } |
| 235 | } |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 236 | |
| 237 | void __inc_zone_page_state(struct page *page, enum zone_stat_item item) |
| 238 | { |
| 239 | __inc_zone_state(page_zone(page), item); |
| 240 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 241 | EXPORT_SYMBOL(__inc_zone_page_state); |
| 242 | |
Christoph Lameter | c878538 | 2007-02-10 01:43:01 -0800 | [diff] [blame] | 243 | void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 244 | { |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 245 | struct per_cpu_pageset *pcp = this_cpu_ptr(zone->pageset); |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 246 | s8 *p = pcp->vm_stat_diff + item; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 247 | |
| 248 | (*p)--; |
| 249 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 250 | if (unlikely(*p < - pcp->stat_threshold)) { |
| 251 | int overstep = pcp->stat_threshold / 2; |
| 252 | |
| 253 | zone_page_state_add(*p - overstep, zone, item); |
| 254 | *p = overstep; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 255 | } |
| 256 | } |
Christoph Lameter | c878538 | 2007-02-10 01:43:01 -0800 | [diff] [blame] | 257 | |
| 258 | void __dec_zone_page_state(struct page *page, enum zone_stat_item item) |
| 259 | { |
| 260 | __dec_zone_state(page_zone(page), item); |
| 261 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 262 | EXPORT_SYMBOL(__dec_zone_page_state); |
| 263 | |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 264 | void inc_zone_state(struct zone *zone, enum zone_stat_item item) |
| 265 | { |
| 266 | unsigned long flags; |
| 267 | |
| 268 | local_irq_save(flags); |
| 269 | __inc_zone_state(zone, item); |
| 270 | local_irq_restore(flags); |
| 271 | } |
| 272 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 273 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
| 274 | { |
| 275 | unsigned long flags; |
| 276 | struct zone *zone; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 277 | |
| 278 | zone = page_zone(page); |
| 279 | local_irq_save(flags); |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 280 | __inc_zone_state(zone, item); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 281 | local_irq_restore(flags); |
| 282 | } |
| 283 | EXPORT_SYMBOL(inc_zone_page_state); |
| 284 | |
| 285 | void dec_zone_page_state(struct page *page, enum zone_stat_item item) |
| 286 | { |
| 287 | unsigned long flags; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 288 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 289 | local_irq_save(flags); |
Christoph Lameter | a302eb4 | 2006-08-31 21:27:34 -0700 | [diff] [blame] | 290 | __dec_zone_page_state(page, item); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 291 | local_irq_restore(flags); |
| 292 | } |
| 293 | EXPORT_SYMBOL(dec_zone_page_state); |
| 294 | |
| 295 | /* |
| 296 | * Update the zone counters for one cpu. |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 297 | * |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 298 | * The cpu specified must be either the current cpu or a processor that |
| 299 | * is not online. If it is the current cpu then the execution thread must |
| 300 | * be pinned to the current cpu. |
| 301 | * |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 302 | * Note that refresh_cpu_vm_stats strives to only access |
| 303 | * node local memory. The per cpu pagesets on remote zones are placed |
| 304 | * in the memory local to the processor using that pageset. So the |
| 305 | * loop over all zones will access a series of cachelines local to |
| 306 | * the processor. |
| 307 | * |
| 308 | * The call to zone_page_state_add updates the cachelines with the |
| 309 | * statistics in the remote zone struct as well as the global cachelines |
| 310 | * with the global counters. These could cause remote node cache line |
| 311 | * bouncing and will have to be only done when necessary. |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 312 | */ |
| 313 | void refresh_cpu_vm_stats(int cpu) |
| 314 | { |
| 315 | struct zone *zone; |
| 316 | int i; |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 317 | int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, }; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 318 | |
KOSAKI Motohiro | ee99c71 | 2009-03-31 15:19:31 -0700 | [diff] [blame] | 319 | for_each_populated_zone(zone) { |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 320 | struct per_cpu_pageset *p; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 321 | |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 322 | p = per_cpu_ptr(zone->pageset, cpu); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 323 | |
| 324 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 325 | if (p->vm_stat_diff[i]) { |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 326 | unsigned long flags; |
| 327 | int v; |
| 328 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 329 | local_irq_save(flags); |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 330 | v = p->vm_stat_diff[i]; |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 331 | p->vm_stat_diff[i] = 0; |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 332 | local_irq_restore(flags); |
| 333 | atomic_long_add(v, &zone->vm_stat[i]); |
| 334 | global_diff[i] += v; |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 335 | #ifdef CONFIG_NUMA |
| 336 | /* 3 seconds idle till flush */ |
| 337 | p->expire = 3; |
| 338 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 339 | } |
Dimitri Sivanich | 468fd62 | 2008-04-28 02:13:37 -0700 | [diff] [blame] | 340 | cond_resched(); |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 341 | #ifdef CONFIG_NUMA |
| 342 | /* |
| 343 | * Deal with draining the remote pageset of this |
| 344 | * processor |
| 345 | * |
| 346 | * Check if there are pages remaining in this pageset |
| 347 | * if not then there is nothing to expire. |
| 348 | */ |
Christoph Lameter | 3dfa572 | 2008-02-04 22:29:19 -0800 | [diff] [blame] | 349 | if (!p->expire || !p->pcp.count) |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 350 | continue; |
| 351 | |
| 352 | /* |
| 353 | * We never drain zones local to this processor. |
| 354 | */ |
| 355 | if (zone_to_nid(zone) == numa_node_id()) { |
| 356 | p->expire = 0; |
| 357 | continue; |
| 358 | } |
| 359 | |
| 360 | p->expire--; |
| 361 | if (p->expire) |
| 362 | continue; |
| 363 | |
Christoph Lameter | 3dfa572 | 2008-02-04 22:29:19 -0800 | [diff] [blame] | 364 | if (p->pcp.count) |
| 365 | drain_zone_pages(zone, &p->pcp); |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 366 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 367 | } |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 368 | |
| 369 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 370 | if (global_diff[i]) |
| 371 | atomic_long_add(global_diff[i], &vm_stat[i]); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 372 | } |
| 373 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 374 | #endif |
| 375 | |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 376 | #ifdef CONFIG_NUMA |
| 377 | /* |
| 378 | * zonelist = the list of zones passed to the allocator |
| 379 | * z = the zone from which the allocation occurred. |
| 380 | * |
| 381 | * Must be called with interrupts disabled. |
| 382 | */ |
Mel Gorman | 18ea7e7 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 383 | void zone_statistics(struct zone *preferred_zone, struct zone *z) |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 384 | { |
Mel Gorman | 18ea7e7 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 385 | if (z->zone_pgdat == preferred_zone->zone_pgdat) { |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 386 | __inc_zone_state(z, NUMA_HIT); |
| 387 | } else { |
| 388 | __inc_zone_state(z, NUMA_MISS); |
Mel Gorman | 18ea7e7 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 389 | __inc_zone_state(preferred_zone, NUMA_FOREIGN); |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 390 | } |
Christoph Lameter | 5d29234 | 2006-09-27 01:50:10 -0700 | [diff] [blame] | 391 | if (z->node == numa_node_id()) |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 392 | __inc_zone_state(z, NUMA_LOCAL); |
| 393 | else |
| 394 | __inc_zone_state(z, NUMA_OTHER); |
| 395 | } |
| 396 | #endif |
| 397 | |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 398 | #ifdef CONFIG_COMPACTION |
Namhyung Kim | 36deb0b | 2010-10-26 14:22:04 -0700 | [diff] [blame] | 399 | |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 400 | struct contig_page_info { |
| 401 | unsigned long free_pages; |
| 402 | unsigned long free_blocks_total; |
| 403 | unsigned long free_blocks_suitable; |
| 404 | }; |
| 405 | |
| 406 | /* |
| 407 | * Calculate the number of free pages in a zone, how many contiguous |
| 408 | * pages are free and how many are large enough to satisfy an allocation of |
| 409 | * the target size. Note that this function makes no attempt to estimate |
| 410 | * how many suitable free blocks there *might* be if MOVABLE pages were |
| 411 | * migrated. Calculating that is possible, but expensive and can be |
| 412 | * figured out from userspace |
| 413 | */ |
| 414 | static void fill_contig_page_info(struct zone *zone, |
| 415 | unsigned int suitable_order, |
| 416 | struct contig_page_info *info) |
| 417 | { |
| 418 | unsigned int order; |
| 419 | |
| 420 | info->free_pages = 0; |
| 421 | info->free_blocks_total = 0; |
| 422 | info->free_blocks_suitable = 0; |
| 423 | |
| 424 | for (order = 0; order < MAX_ORDER; order++) { |
| 425 | unsigned long blocks; |
| 426 | |
| 427 | /* Count number of free blocks */ |
| 428 | blocks = zone->free_area[order].nr_free; |
| 429 | info->free_blocks_total += blocks; |
| 430 | |
| 431 | /* Count free base pages */ |
| 432 | info->free_pages += blocks << order; |
| 433 | |
| 434 | /* Count the suitable free blocks */ |
| 435 | if (order >= suitable_order) |
| 436 | info->free_blocks_suitable += blocks << |
| 437 | (order - suitable_order); |
| 438 | } |
| 439 | } |
Mel Gorman | f1a5ab1 | 2010-05-24 14:32:26 -0700 | [diff] [blame] | 440 | |
| 441 | /* |
| 442 | * A fragmentation index only makes sense if an allocation of a requested |
| 443 | * size would fail. If that is true, the fragmentation index indicates |
| 444 | * whether external fragmentation or a lack of memory was the problem. |
| 445 | * The value can be used to determine if page reclaim or compaction |
| 446 | * should be used |
| 447 | */ |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 448 | static int __fragmentation_index(unsigned int order, struct contig_page_info *info) |
Mel Gorman | f1a5ab1 | 2010-05-24 14:32:26 -0700 | [diff] [blame] | 449 | { |
| 450 | unsigned long requested = 1UL << order; |
| 451 | |
| 452 | if (!info->free_blocks_total) |
| 453 | return 0; |
| 454 | |
| 455 | /* Fragmentation index only makes sense when a request would fail */ |
| 456 | if (info->free_blocks_suitable) |
| 457 | return -1000; |
| 458 | |
| 459 | /* |
| 460 | * Index is between 0 and 1 so return within 3 decimal places |
| 461 | * |
| 462 | * 0 => allocation would fail due to lack of memory |
| 463 | * 1 => allocation would fail due to fragmentation |
| 464 | */ |
| 465 | return 1000 - div_u64( (1000+(div_u64(info->free_pages * 1000ULL, requested))), info->free_blocks_total); |
| 466 | } |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 467 | |
| 468 | /* Same as __fragmentation index but allocs contig_page_info on stack */ |
| 469 | int fragmentation_index(struct zone *zone, unsigned int order) |
| 470 | { |
| 471 | struct contig_page_info info; |
| 472 | |
| 473 | fill_contig_page_info(zone, order, &info); |
| 474 | return __fragmentation_index(order, &info); |
| 475 | } |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 476 | #endif |
| 477 | |
| 478 | #if defined(CONFIG_PROC_FS) || defined(CONFIG_COMPACTION) |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 479 | #include <linux/proc_fs.h> |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 480 | #include <linux/seq_file.h> |
| 481 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 482 | static char * const migratetype_names[MIGRATE_TYPES] = { |
| 483 | "Unmovable", |
| 484 | "Reclaimable", |
| 485 | "Movable", |
| 486 | "Reserve", |
KOSAKI Motohiro | 91446b0 | 2008-04-15 14:34:42 -0700 | [diff] [blame] | 487 | "Isolate", |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 488 | }; |
| 489 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 490 | static void *frag_start(struct seq_file *m, loff_t *pos) |
| 491 | { |
| 492 | pg_data_t *pgdat; |
| 493 | loff_t node = *pos; |
| 494 | for (pgdat = first_online_pgdat(); |
| 495 | pgdat && node; |
| 496 | pgdat = next_online_pgdat(pgdat)) |
| 497 | --node; |
| 498 | |
| 499 | return pgdat; |
| 500 | } |
| 501 | |
| 502 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) |
| 503 | { |
| 504 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 505 | |
| 506 | (*pos)++; |
| 507 | return next_online_pgdat(pgdat); |
| 508 | } |
| 509 | |
| 510 | static void frag_stop(struct seq_file *m, void *arg) |
| 511 | { |
| 512 | } |
| 513 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 514 | /* Walk all the zones in a node and print using a callback */ |
| 515 | static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat, |
| 516 | void (*print)(struct seq_file *m, pg_data_t *, struct zone *)) |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 517 | { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 518 | struct zone *zone; |
| 519 | struct zone *node_zones = pgdat->node_zones; |
| 520 | unsigned long flags; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 521 | |
| 522 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { |
| 523 | if (!populated_zone(zone)) |
| 524 | continue; |
| 525 | |
| 526 | spin_lock_irqsave(&zone->lock, flags); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 527 | print(m, pgdat, zone); |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 528 | spin_unlock_irqrestore(&zone->lock, flags); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 529 | } |
| 530 | } |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 531 | #endif |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 532 | |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 533 | #ifdef CONFIG_PROC_FS |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 534 | static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, |
| 535 | struct zone *zone) |
| 536 | { |
| 537 | int order; |
| 538 | |
| 539 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); |
| 540 | for (order = 0; order < MAX_ORDER; ++order) |
| 541 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); |
| 542 | seq_putc(m, '\n'); |
| 543 | } |
| 544 | |
| 545 | /* |
| 546 | * This walks the free areas for each zone. |
| 547 | */ |
| 548 | static int frag_show(struct seq_file *m, void *arg) |
| 549 | { |
| 550 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 551 | walk_zones_in_node(m, pgdat, frag_show_print); |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | static void pagetypeinfo_showfree_print(struct seq_file *m, |
| 556 | pg_data_t *pgdat, struct zone *zone) |
| 557 | { |
| 558 | int order, mtype; |
| 559 | |
| 560 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) { |
| 561 | seq_printf(m, "Node %4d, zone %8s, type %12s ", |
| 562 | pgdat->node_id, |
| 563 | zone->name, |
| 564 | migratetype_names[mtype]); |
| 565 | for (order = 0; order < MAX_ORDER; ++order) { |
| 566 | unsigned long freecount = 0; |
| 567 | struct free_area *area; |
| 568 | struct list_head *curr; |
| 569 | |
| 570 | area = &(zone->free_area[order]); |
| 571 | |
| 572 | list_for_each(curr, &area->free_list[mtype]) |
| 573 | freecount++; |
| 574 | seq_printf(m, "%6lu ", freecount); |
| 575 | } |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 576 | seq_putc(m, '\n'); |
| 577 | } |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 578 | } |
| 579 | |
| 580 | /* Print out the free pages at each order for each migatetype */ |
| 581 | static int pagetypeinfo_showfree(struct seq_file *m, void *arg) |
| 582 | { |
| 583 | int order; |
| 584 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 585 | |
| 586 | /* Print header */ |
| 587 | seq_printf(m, "%-43s ", "Free pages count per migrate type at order"); |
| 588 | for (order = 0; order < MAX_ORDER; ++order) |
| 589 | seq_printf(m, "%6d ", order); |
| 590 | seq_putc(m, '\n'); |
| 591 | |
| 592 | walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print); |
| 593 | |
| 594 | return 0; |
| 595 | } |
| 596 | |
| 597 | static void pagetypeinfo_showblockcount_print(struct seq_file *m, |
| 598 | pg_data_t *pgdat, struct zone *zone) |
| 599 | { |
| 600 | int mtype; |
| 601 | unsigned long pfn; |
| 602 | unsigned long start_pfn = zone->zone_start_pfn; |
| 603 | unsigned long end_pfn = start_pfn + zone->spanned_pages; |
| 604 | unsigned long count[MIGRATE_TYPES] = { 0, }; |
| 605 | |
| 606 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { |
| 607 | struct page *page; |
| 608 | |
| 609 | if (!pfn_valid(pfn)) |
| 610 | continue; |
| 611 | |
| 612 | page = pfn_to_page(pfn); |
Mel Gorman | eb33575 | 2009-05-13 17:34:48 +0100 | [diff] [blame] | 613 | |
| 614 | /* Watch for unexpected holes punched in the memmap */ |
| 615 | if (!memmap_valid_within(pfn, page, zone)) |
Mel Gorman | e80d6a2 | 2008-08-14 11:10:14 +0100 | [diff] [blame] | 616 | continue; |
Mel Gorman | eb33575 | 2009-05-13 17:34:48 +0100 | [diff] [blame] | 617 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 618 | mtype = get_pageblock_migratetype(page); |
| 619 | |
Mel Gorman | e80d6a2 | 2008-08-14 11:10:14 +0100 | [diff] [blame] | 620 | if (mtype < MIGRATE_TYPES) |
| 621 | count[mtype]++; |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | /* Print counts */ |
| 625 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); |
| 626 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) |
| 627 | seq_printf(m, "%12lu ", count[mtype]); |
| 628 | seq_putc(m, '\n'); |
| 629 | } |
| 630 | |
| 631 | /* Print out the free pages at each order for each migratetype */ |
| 632 | static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg) |
| 633 | { |
| 634 | int mtype; |
| 635 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 636 | |
| 637 | seq_printf(m, "\n%-23s", "Number of blocks type "); |
| 638 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) |
| 639 | seq_printf(m, "%12s ", migratetype_names[mtype]); |
| 640 | seq_putc(m, '\n'); |
| 641 | walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print); |
| 642 | |
| 643 | return 0; |
| 644 | } |
| 645 | |
| 646 | /* |
| 647 | * This prints out statistics in relation to grouping pages by mobility. |
| 648 | * It is expensive to collect so do not constantly read the file. |
| 649 | */ |
| 650 | static int pagetypeinfo_show(struct seq_file *m, void *arg) |
| 651 | { |
| 652 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 653 | |
KOSAKI Motohiro | 41b25a3 | 2008-04-30 00:52:13 -0700 | [diff] [blame] | 654 | /* check memoryless node */ |
| 655 | if (!node_state(pgdat->node_id, N_HIGH_MEMORY)) |
| 656 | return 0; |
| 657 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 658 | seq_printf(m, "Page block order: %d\n", pageblock_order); |
| 659 | seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages); |
| 660 | seq_putc(m, '\n'); |
| 661 | pagetypeinfo_showfree(m, pgdat); |
| 662 | pagetypeinfo_showblockcount(m, pgdat); |
| 663 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 664 | return 0; |
| 665 | } |
| 666 | |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 667 | static const struct seq_operations fragmentation_op = { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 668 | .start = frag_start, |
| 669 | .next = frag_next, |
| 670 | .stop = frag_stop, |
| 671 | .show = frag_show, |
| 672 | }; |
| 673 | |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 674 | static int fragmentation_open(struct inode *inode, struct file *file) |
| 675 | { |
| 676 | return seq_open(file, &fragmentation_op); |
| 677 | } |
| 678 | |
| 679 | static const struct file_operations fragmentation_file_operations = { |
| 680 | .open = fragmentation_open, |
| 681 | .read = seq_read, |
| 682 | .llseek = seq_lseek, |
| 683 | .release = seq_release, |
| 684 | }; |
| 685 | |
Alexey Dobriyan | 74e2e8e | 2008-10-06 04:15:36 +0400 | [diff] [blame] | 686 | static const struct seq_operations pagetypeinfo_op = { |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 687 | .start = frag_start, |
| 688 | .next = frag_next, |
| 689 | .stop = frag_stop, |
| 690 | .show = pagetypeinfo_show, |
| 691 | }; |
| 692 | |
Alexey Dobriyan | 74e2e8e | 2008-10-06 04:15:36 +0400 | [diff] [blame] | 693 | static int pagetypeinfo_open(struct inode *inode, struct file *file) |
| 694 | { |
| 695 | return seq_open(file, &pagetypeinfo_op); |
| 696 | } |
| 697 | |
| 698 | static const struct file_operations pagetypeinfo_file_ops = { |
| 699 | .open = pagetypeinfo_open, |
| 700 | .read = seq_read, |
| 701 | .llseek = seq_lseek, |
| 702 | .release = seq_release, |
| 703 | }; |
| 704 | |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 705 | #ifdef CONFIG_ZONE_DMA |
| 706 | #define TEXT_FOR_DMA(xx) xx "_dma", |
| 707 | #else |
| 708 | #define TEXT_FOR_DMA(xx) |
| 709 | #endif |
| 710 | |
Christoph Lameter | 27bf71c | 2006-09-25 23:31:15 -0700 | [diff] [blame] | 711 | #ifdef CONFIG_ZONE_DMA32 |
| 712 | #define TEXT_FOR_DMA32(xx) xx "_dma32", |
| 713 | #else |
| 714 | #define TEXT_FOR_DMA32(xx) |
| 715 | #endif |
| 716 | |
| 717 | #ifdef CONFIG_HIGHMEM |
| 718 | #define TEXT_FOR_HIGHMEM(xx) xx "_high", |
| 719 | #else |
| 720 | #define TEXT_FOR_HIGHMEM(xx) |
| 721 | #endif |
| 722 | |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 723 | #define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \ |
Mel Gorman | 2a1e274 | 2007-07-17 04:03:12 -0700 | [diff] [blame] | 724 | TEXT_FOR_HIGHMEM(xx) xx "_movable", |
Christoph Lameter | 27bf71c | 2006-09-25 23:31:15 -0700 | [diff] [blame] | 725 | |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 726 | static const char * const vmstat_text[] = { |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 727 | /* Zoned VM counters */ |
Christoph Lameter | d23ad42 | 2007-02-10 01:43:02 -0800 | [diff] [blame] | 728 | "nr_free_pages", |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 729 | "nr_inactive_anon", |
| 730 | "nr_active_anon", |
| 731 | "nr_inactive_file", |
| 732 | "nr_active_file", |
Lee Schermerhorn | 7b85412 | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 733 | "nr_unevictable", |
Nick Piggin | 5344b7e | 2008-10-18 20:26:51 -0700 | [diff] [blame] | 734 | "nr_mlock", |
Christoph Lameter | f3dbd34 | 2006-06-30 01:55:36 -0700 | [diff] [blame] | 735 | "nr_anon_pages", |
Christoph Lameter | 65ba55f | 2006-06-30 01:55:34 -0700 | [diff] [blame] | 736 | "nr_mapped", |
Christoph Lameter | 347ce43 | 2006-06-30 01:55:35 -0700 | [diff] [blame] | 737 | "nr_file_pages", |
Christoph Lameter | 51ed449 | 2007-02-10 01:43:02 -0800 | [diff] [blame] | 738 | "nr_dirty", |
| 739 | "nr_writeback", |
Christoph Lameter | 972d1a7 | 2006-09-25 23:31:51 -0700 | [diff] [blame] | 740 | "nr_slab_reclaimable", |
| 741 | "nr_slab_unreclaimable", |
Christoph Lameter | df849a1 | 2006-06-30 01:55:38 -0700 | [diff] [blame] | 742 | "nr_page_table_pages", |
KOSAKI Motohiro | c6a7f57 | 2009-09-21 17:01:32 -0700 | [diff] [blame] | 743 | "nr_kernel_stack", |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 744 | "nr_unstable", |
Christoph Lameter | d2c5e30 | 2006-06-30 01:55:41 -0700 | [diff] [blame] | 745 | "nr_bounce", |
Andrew Morton | e129b5c | 2006-09-27 01:50:00 -0700 | [diff] [blame] | 746 | "nr_vmscan_write", |
Miklos Szeredi | fc3ba69 | 2008-04-30 00:54:38 -0700 | [diff] [blame] | 747 | "nr_writeback_temp", |
KOSAKI Motohiro | a731286 | 2009-09-21 17:01:37 -0700 | [diff] [blame] | 748 | "nr_isolated_anon", |
| 749 | "nr_isolated_file", |
KOSAKI Motohiro | 4b02108 | 2009-09-21 17:01:33 -0700 | [diff] [blame] | 750 | "nr_shmem", |
Michael Rubin | ea941f0 | 2010-10-26 14:21:35 -0700 | [diff] [blame] | 751 | "nr_dirtied", |
| 752 | "nr_written", |
| 753 | |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 754 | #ifdef CONFIG_NUMA |
| 755 | "numa_hit", |
| 756 | "numa_miss", |
| 757 | "numa_foreign", |
| 758 | "numa_interleave", |
| 759 | "numa_local", |
| 760 | "numa_other", |
| 761 | #endif |
Wu Fengguang | e172662 | 2010-12-02 14:31:13 -0800 | [diff] [blame] | 762 | "nr_dirty_threshold", |
| 763 | "nr_dirty_background_threshold", |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 764 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 765 | #ifdef CONFIG_VM_EVENT_COUNTERS |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 766 | "pgpgin", |
| 767 | "pgpgout", |
| 768 | "pswpin", |
| 769 | "pswpout", |
| 770 | |
Christoph Lameter | 27bf71c | 2006-09-25 23:31:15 -0700 | [diff] [blame] | 771 | TEXTS_FOR_ZONES("pgalloc") |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 772 | |
| 773 | "pgfree", |
| 774 | "pgactivate", |
| 775 | "pgdeactivate", |
| 776 | |
| 777 | "pgfault", |
| 778 | "pgmajfault", |
| 779 | |
Christoph Lameter | 27bf71c | 2006-09-25 23:31:15 -0700 | [diff] [blame] | 780 | TEXTS_FOR_ZONES("pgrefill") |
| 781 | TEXTS_FOR_ZONES("pgsteal") |
| 782 | TEXTS_FOR_ZONES("pgscan_kswapd") |
| 783 | TEXTS_FOR_ZONES("pgscan_direct") |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 784 | |
Mel Gorman | 24cf72518 | 2009-06-16 15:33:23 -0700 | [diff] [blame] | 785 | #ifdef CONFIG_NUMA |
| 786 | "zone_reclaim_failed", |
| 787 | #endif |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 788 | "pginodesteal", |
| 789 | "slabs_scanned", |
| 790 | "kswapd_steal", |
| 791 | "kswapd_inodesteal", |
KOSAKI Motohiro | bb3ab59 | 2009-12-14 17:58:55 -0800 | [diff] [blame] | 792 | "kswapd_low_wmark_hit_quickly", |
| 793 | "kswapd_high_wmark_hit_quickly", |
| 794 | "kswapd_skip_congestion_wait", |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 795 | "pageoutrun", |
| 796 | "allocstall", |
| 797 | |
| 798 | "pgrotated", |
Mel Gorman | 748446b | 2010-05-24 14:32:27 -0700 | [diff] [blame] | 799 | |
| 800 | #ifdef CONFIG_COMPACTION |
| 801 | "compact_blocks_moved", |
| 802 | "compact_pages_moved", |
| 803 | "compact_pagemigrate_failed", |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 804 | "compact_stall", |
| 805 | "compact_fail", |
| 806 | "compact_success", |
Mel Gorman | 748446b | 2010-05-24 14:32:27 -0700 | [diff] [blame] | 807 | #endif |
| 808 | |
Adam Litke | 3b11630 | 2008-04-28 02:13:06 -0700 | [diff] [blame] | 809 | #ifdef CONFIG_HUGETLB_PAGE |
| 810 | "htlb_buddy_alloc_success", |
| 811 | "htlb_buddy_alloc_fail", |
| 812 | #endif |
Lee Schermerhorn | bbfd28e | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 813 | "unevictable_pgs_culled", |
| 814 | "unevictable_pgs_scanned", |
| 815 | "unevictable_pgs_rescued", |
Nick Piggin | 5344b7e | 2008-10-18 20:26:51 -0700 | [diff] [blame] | 816 | "unevictable_pgs_mlocked", |
| 817 | "unevictable_pgs_munlocked", |
| 818 | "unevictable_pgs_cleared", |
| 819 | "unevictable_pgs_stranded", |
Lee Schermerhorn | 985737c | 2008-10-18 20:26:53 -0700 | [diff] [blame] | 820 | "unevictable_pgs_mlockfreed", |
Lee Schermerhorn | bbfd28e | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 821 | #endif |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 822 | }; |
| 823 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 824 | static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, |
| 825 | struct zone *zone) |
| 826 | { |
| 827 | int i; |
| 828 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); |
| 829 | seq_printf(m, |
| 830 | "\n pages free %lu" |
| 831 | "\n min %lu" |
| 832 | "\n low %lu" |
| 833 | "\n high %lu" |
Wu Fengguang | 08d9ae7 | 2009-06-16 15:32:30 -0700 | [diff] [blame] | 834 | "\n scanned %lu" |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 835 | "\n spanned %lu" |
| 836 | "\n present %lu", |
Christoph Lameter | aa45484 | 2010-09-09 16:38:17 -0700 | [diff] [blame] | 837 | zone_nr_free_pages(zone), |
Mel Gorman | 4185896 | 2009-06-16 15:32:12 -0700 | [diff] [blame] | 838 | min_wmark_pages(zone), |
| 839 | low_wmark_pages(zone), |
| 840 | high_wmark_pages(zone), |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 841 | zone->pages_scanned, |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 842 | zone->spanned_pages, |
| 843 | zone->present_pages); |
| 844 | |
| 845 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 846 | seq_printf(m, "\n %-12s %lu", vmstat_text[i], |
| 847 | zone_page_state(zone, i)); |
| 848 | |
| 849 | seq_printf(m, |
| 850 | "\n protection: (%lu", |
| 851 | zone->lowmem_reserve[0]); |
| 852 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) |
| 853 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); |
| 854 | seq_printf(m, |
| 855 | ")" |
| 856 | "\n pagesets"); |
| 857 | for_each_online_cpu(i) { |
| 858 | struct per_cpu_pageset *pageset; |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 859 | |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 860 | pageset = per_cpu_ptr(zone->pageset, i); |
Christoph Lameter | 3dfa572 | 2008-02-04 22:29:19 -0800 | [diff] [blame] | 861 | seq_printf(m, |
| 862 | "\n cpu: %i" |
| 863 | "\n count: %i" |
| 864 | "\n high: %i" |
| 865 | "\n batch: %i", |
| 866 | i, |
| 867 | pageset->pcp.count, |
| 868 | pageset->pcp.high, |
| 869 | pageset->pcp.batch); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 870 | #ifdef CONFIG_SMP |
| 871 | seq_printf(m, "\n vm stats threshold: %d", |
| 872 | pageset->stat_threshold); |
| 873 | #endif |
| 874 | } |
| 875 | seq_printf(m, |
| 876 | "\n all_unreclaimable: %u" |
Rik van Riel | 556adec | 2008-10-18 20:26:34 -0700 | [diff] [blame] | 877 | "\n start_pfn: %lu" |
| 878 | "\n inactive_ratio: %u", |
KOSAKI Motohiro | 93e4a89 | 2010-03-05 13:41:55 -0800 | [diff] [blame] | 879 | zone->all_unreclaimable, |
Rik van Riel | 556adec | 2008-10-18 20:26:34 -0700 | [diff] [blame] | 880 | zone->zone_start_pfn, |
| 881 | zone->inactive_ratio); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 882 | seq_putc(m, '\n'); |
| 883 | } |
| 884 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 885 | /* |
| 886 | * Output information about zones in @pgdat. |
| 887 | */ |
| 888 | static int zoneinfo_show(struct seq_file *m, void *arg) |
| 889 | { |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 890 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 891 | walk_zones_in_node(m, pgdat, zoneinfo_show_print); |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 892 | return 0; |
| 893 | } |
| 894 | |
Alexey Dobriyan | 5c9fe62 | 2008-10-06 04:19:42 +0400 | [diff] [blame] | 895 | static const struct seq_operations zoneinfo_op = { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 896 | .start = frag_start, /* iterate over all zones. The same as in |
| 897 | * fragmentation. */ |
| 898 | .next = frag_next, |
| 899 | .stop = frag_stop, |
| 900 | .show = zoneinfo_show, |
| 901 | }; |
| 902 | |
Alexey Dobriyan | 5c9fe62 | 2008-10-06 04:19:42 +0400 | [diff] [blame] | 903 | static int zoneinfo_open(struct inode *inode, struct file *file) |
| 904 | { |
| 905 | return seq_open(file, &zoneinfo_op); |
| 906 | } |
| 907 | |
| 908 | static const struct file_operations proc_zoneinfo_file_operations = { |
| 909 | .open = zoneinfo_open, |
| 910 | .read = seq_read, |
| 911 | .llseek = seq_lseek, |
| 912 | .release = seq_release, |
| 913 | }; |
| 914 | |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 915 | enum writeback_stat_item { |
| 916 | NR_DIRTY_THRESHOLD, |
| 917 | NR_DIRTY_BG_THRESHOLD, |
| 918 | NR_VM_WRITEBACK_STAT_ITEMS, |
| 919 | }; |
| 920 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 921 | static void *vmstat_start(struct seq_file *m, loff_t *pos) |
| 922 | { |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 923 | unsigned long *v; |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 924 | int i, stat_items_size; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 925 | |
| 926 | if (*pos >= ARRAY_SIZE(vmstat_text)) |
| 927 | return NULL; |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 928 | stat_items_size = NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) + |
| 929 | NR_VM_WRITEBACK_STAT_ITEMS * sizeof(unsigned long); |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 930 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 931 | #ifdef CONFIG_VM_EVENT_COUNTERS |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 932 | stat_items_size += sizeof(struct vm_event_state); |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 933 | #endif |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 934 | |
| 935 | v = kmalloc(stat_items_size, GFP_KERNEL); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 936 | m->private = v; |
| 937 | if (!v) |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 938 | return ERR_PTR(-ENOMEM); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 939 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 940 | v[i] = global_page_state(i); |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 941 | v += NR_VM_ZONE_STAT_ITEMS; |
| 942 | |
| 943 | global_dirty_limits(v + NR_DIRTY_BG_THRESHOLD, |
| 944 | v + NR_DIRTY_THRESHOLD); |
| 945 | v += NR_VM_WRITEBACK_STAT_ITEMS; |
| 946 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 947 | #ifdef CONFIG_VM_EVENT_COUNTERS |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 948 | all_vm_events(v); |
| 949 | v[PGPGIN] /= 2; /* sectors -> kbytes */ |
| 950 | v[PGPGOUT] /= 2; |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 951 | #endif |
Wu Fengguang | ff8b16d | 2010-11-04 01:56:49 +0800 | [diff] [blame] | 952 | return (unsigned long *)m->private + *pos; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 953 | } |
| 954 | |
| 955 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) |
| 956 | { |
| 957 | (*pos)++; |
| 958 | if (*pos >= ARRAY_SIZE(vmstat_text)) |
| 959 | return NULL; |
| 960 | return (unsigned long *)m->private + *pos; |
| 961 | } |
| 962 | |
| 963 | static int vmstat_show(struct seq_file *m, void *arg) |
| 964 | { |
| 965 | unsigned long *l = arg; |
| 966 | unsigned long off = l - (unsigned long *)m->private; |
| 967 | |
| 968 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); |
| 969 | return 0; |
| 970 | } |
| 971 | |
| 972 | static void vmstat_stop(struct seq_file *m, void *arg) |
| 973 | { |
| 974 | kfree(m->private); |
| 975 | m->private = NULL; |
| 976 | } |
| 977 | |
Alexey Dobriyan | b6aa44a | 2008-10-06 04:17:48 +0400 | [diff] [blame] | 978 | static const struct seq_operations vmstat_op = { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 979 | .start = vmstat_start, |
| 980 | .next = vmstat_next, |
| 981 | .stop = vmstat_stop, |
| 982 | .show = vmstat_show, |
| 983 | }; |
| 984 | |
Alexey Dobriyan | b6aa44a | 2008-10-06 04:17:48 +0400 | [diff] [blame] | 985 | static int vmstat_open(struct inode *inode, struct file *file) |
| 986 | { |
| 987 | return seq_open(file, &vmstat_op); |
| 988 | } |
| 989 | |
| 990 | static const struct file_operations proc_vmstat_file_operations = { |
| 991 | .open = vmstat_open, |
| 992 | .read = seq_read, |
| 993 | .llseek = seq_lseek, |
| 994 | .release = seq_release, |
| 995 | }; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 996 | #endif /* CONFIG_PROC_FS */ |
| 997 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 998 | #ifdef CONFIG_SMP |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 999 | static DEFINE_PER_CPU(struct delayed_work, vmstat_work); |
Christoph Lameter | 77461ab | 2007-05-09 02:35:13 -0700 | [diff] [blame] | 1000 | int sysctl_stat_interval __read_mostly = HZ; |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1001 | |
| 1002 | static void vmstat_update(struct work_struct *w) |
| 1003 | { |
| 1004 | refresh_cpu_vm_stats(smp_processor_id()); |
Christoph Lameter | 77461ab | 2007-05-09 02:35:13 -0700 | [diff] [blame] | 1005 | schedule_delayed_work(&__get_cpu_var(vmstat_work), |
Anton Blanchard | 98f4ebb | 2009-04-02 16:56:39 -0700 | [diff] [blame] | 1006 | round_jiffies_relative(sysctl_stat_interval)); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1007 | } |
| 1008 | |
Randy Dunlap | 42614fc | 2007-11-14 17:00:12 -0800 | [diff] [blame] | 1009 | static void __cpuinit start_cpu_timer(int cpu) |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1010 | { |
Tejun Heo | 1871e52 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 1011 | struct delayed_work *work = &per_cpu(vmstat_work, cpu); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1012 | |
Tejun Heo | 1871e52 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 1013 | INIT_DELAYED_WORK_DEFERRABLE(work, vmstat_update); |
| 1014 | schedule_delayed_work_on(cpu, work, __round_jiffies_relative(HZ, cpu)); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1015 | } |
| 1016 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1017 | /* |
| 1018 | * Use the cpu notifier to insure that the thresholds are recalculated |
| 1019 | * when necessary. |
| 1020 | */ |
| 1021 | static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb, |
| 1022 | unsigned long action, |
| 1023 | void *hcpu) |
| 1024 | { |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1025 | long cpu = (long)hcpu; |
| 1026 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1027 | switch (action) { |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1028 | case CPU_ONLINE: |
| 1029 | case CPU_ONLINE_FROZEN: |
KAMEZAWA Hiroyuki | 5ee28a4 | 2010-09-09 16:38:14 -0700 | [diff] [blame] | 1030 | refresh_zone_stat_thresholds(); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1031 | start_cpu_timer(cpu); |
Christoph Lameter | ad59692 | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 1032 | node_set_state(cpu_to_node(cpu), N_CPU); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1033 | break; |
| 1034 | case CPU_DOWN_PREPARE: |
| 1035 | case CPU_DOWN_PREPARE_FROZEN: |
| 1036 | cancel_rearming_delayed_work(&per_cpu(vmstat_work, cpu)); |
| 1037 | per_cpu(vmstat_work, cpu).work.func = NULL; |
| 1038 | break; |
| 1039 | case CPU_DOWN_FAILED: |
| 1040 | case CPU_DOWN_FAILED_FROZEN: |
| 1041 | start_cpu_timer(cpu); |
| 1042 | break; |
Andy Whitcroft | ce421c7 | 2006-12-06 20:33:08 -0800 | [diff] [blame] | 1043 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1044 | case CPU_DEAD_FROZEN: |
Andy Whitcroft | ce421c7 | 2006-12-06 20:33:08 -0800 | [diff] [blame] | 1045 | refresh_zone_stat_thresholds(); |
| 1046 | break; |
| 1047 | default: |
| 1048 | break; |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1049 | } |
| 1050 | return NOTIFY_OK; |
| 1051 | } |
| 1052 | |
| 1053 | static struct notifier_block __cpuinitdata vmstat_notifier = |
| 1054 | { &vmstat_cpuup_callback, NULL, 0 }; |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 1055 | #endif |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1056 | |
Adrian Bunk | e2fc88d | 2007-10-16 01:26:27 -0700 | [diff] [blame] | 1057 | static int __init setup_vmstat(void) |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1058 | { |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 1059 | #ifdef CONFIG_SMP |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1060 | int cpu; |
| 1061 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1062 | refresh_zone_stat_thresholds(); |
| 1063 | register_cpu_notifier(&vmstat_notifier); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1064 | |
| 1065 | for_each_online_cpu(cpu) |
| 1066 | start_cpu_timer(cpu); |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 1067 | #endif |
| 1068 | #ifdef CONFIG_PROC_FS |
| 1069 | proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations); |
Alexey Dobriyan | 74e2e8e | 2008-10-06 04:15:36 +0400 | [diff] [blame] | 1070 | proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops); |
Alexey Dobriyan | b6aa44a | 2008-10-06 04:17:48 +0400 | [diff] [blame] | 1071 | proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations); |
Alexey Dobriyan | 5c9fe62 | 2008-10-06 04:19:42 +0400 | [diff] [blame] | 1072 | proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations); |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 1073 | #endif |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1074 | return 0; |
| 1075 | } |
| 1076 | module_init(setup_vmstat) |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 1077 | |
| 1078 | #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_COMPACTION) |
| 1079 | #include <linux/debugfs.h> |
| 1080 | |
| 1081 | static struct dentry *extfrag_debug_root; |
| 1082 | |
| 1083 | /* |
| 1084 | * Return an index indicating how much of the available free memory is |
| 1085 | * unusable for an allocation of the requested size. |
| 1086 | */ |
| 1087 | static int unusable_free_index(unsigned int order, |
| 1088 | struct contig_page_info *info) |
| 1089 | { |
| 1090 | /* No free memory is interpreted as all free memory is unusable */ |
| 1091 | if (info->free_pages == 0) |
| 1092 | return 1000; |
| 1093 | |
| 1094 | /* |
| 1095 | * Index should be a value between 0 and 1. Return a value to 3 |
| 1096 | * decimal places. |
| 1097 | * |
| 1098 | * 0 => no fragmentation |
| 1099 | * 1 => high fragmentation |
| 1100 | */ |
| 1101 | return div_u64((info->free_pages - (info->free_blocks_suitable << order)) * 1000ULL, info->free_pages); |
| 1102 | |
| 1103 | } |
| 1104 | |
| 1105 | static void unusable_show_print(struct seq_file *m, |
| 1106 | pg_data_t *pgdat, struct zone *zone) |
| 1107 | { |
| 1108 | unsigned int order; |
| 1109 | int index; |
| 1110 | struct contig_page_info info; |
| 1111 | |
| 1112 | seq_printf(m, "Node %d, zone %8s ", |
| 1113 | pgdat->node_id, |
| 1114 | zone->name); |
| 1115 | for (order = 0; order < MAX_ORDER; ++order) { |
| 1116 | fill_contig_page_info(zone, order, &info); |
| 1117 | index = unusable_free_index(order, &info); |
| 1118 | seq_printf(m, "%d.%03d ", index / 1000, index % 1000); |
| 1119 | } |
| 1120 | |
| 1121 | seq_putc(m, '\n'); |
| 1122 | } |
| 1123 | |
| 1124 | /* |
| 1125 | * Display unusable free space index |
| 1126 | * |
| 1127 | * The unusable free space index measures how much of the available free |
| 1128 | * memory cannot be used to satisfy an allocation of a given size and is a |
| 1129 | * value between 0 and 1. The higher the value, the more of free memory is |
| 1130 | * unusable and by implication, the worse the external fragmentation is. This |
| 1131 | * can be expressed as a percentage by multiplying by 100. |
| 1132 | */ |
| 1133 | static int unusable_show(struct seq_file *m, void *arg) |
| 1134 | { |
| 1135 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 1136 | |
| 1137 | /* check memoryless node */ |
| 1138 | if (!node_state(pgdat->node_id, N_HIGH_MEMORY)) |
| 1139 | return 0; |
| 1140 | |
| 1141 | walk_zones_in_node(m, pgdat, unusable_show_print); |
| 1142 | |
| 1143 | return 0; |
| 1144 | } |
| 1145 | |
| 1146 | static const struct seq_operations unusable_op = { |
| 1147 | .start = frag_start, |
| 1148 | .next = frag_next, |
| 1149 | .stop = frag_stop, |
| 1150 | .show = unusable_show, |
| 1151 | }; |
| 1152 | |
| 1153 | static int unusable_open(struct inode *inode, struct file *file) |
| 1154 | { |
| 1155 | return seq_open(file, &unusable_op); |
| 1156 | } |
| 1157 | |
| 1158 | static const struct file_operations unusable_file_ops = { |
| 1159 | .open = unusable_open, |
| 1160 | .read = seq_read, |
| 1161 | .llseek = seq_lseek, |
| 1162 | .release = seq_release, |
| 1163 | }; |
| 1164 | |
Mel Gorman | f1a5ab1 | 2010-05-24 14:32:26 -0700 | [diff] [blame] | 1165 | static void extfrag_show_print(struct seq_file *m, |
| 1166 | pg_data_t *pgdat, struct zone *zone) |
| 1167 | { |
| 1168 | unsigned int order; |
| 1169 | int index; |
| 1170 | |
| 1171 | /* Alloc on stack as interrupts are disabled for zone walk */ |
| 1172 | struct contig_page_info info; |
| 1173 | |
| 1174 | seq_printf(m, "Node %d, zone %8s ", |
| 1175 | pgdat->node_id, |
| 1176 | zone->name); |
| 1177 | for (order = 0; order < MAX_ORDER; ++order) { |
| 1178 | fill_contig_page_info(zone, order, &info); |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 1179 | index = __fragmentation_index(order, &info); |
Mel Gorman | f1a5ab1 | 2010-05-24 14:32:26 -0700 | [diff] [blame] | 1180 | seq_printf(m, "%d.%03d ", index / 1000, index % 1000); |
| 1181 | } |
| 1182 | |
| 1183 | seq_putc(m, '\n'); |
| 1184 | } |
| 1185 | |
| 1186 | /* |
| 1187 | * Display fragmentation index for orders that allocations would fail for |
| 1188 | */ |
| 1189 | static int extfrag_show(struct seq_file *m, void *arg) |
| 1190 | { |
| 1191 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 1192 | |
| 1193 | walk_zones_in_node(m, pgdat, extfrag_show_print); |
| 1194 | |
| 1195 | return 0; |
| 1196 | } |
| 1197 | |
| 1198 | static const struct seq_operations extfrag_op = { |
| 1199 | .start = frag_start, |
| 1200 | .next = frag_next, |
| 1201 | .stop = frag_stop, |
| 1202 | .show = extfrag_show, |
| 1203 | }; |
| 1204 | |
| 1205 | static int extfrag_open(struct inode *inode, struct file *file) |
| 1206 | { |
| 1207 | return seq_open(file, &extfrag_op); |
| 1208 | } |
| 1209 | |
| 1210 | static const struct file_operations extfrag_file_ops = { |
| 1211 | .open = extfrag_open, |
| 1212 | .read = seq_read, |
| 1213 | .llseek = seq_lseek, |
| 1214 | .release = seq_release, |
| 1215 | }; |
| 1216 | |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 1217 | static int __init extfrag_debug_init(void) |
| 1218 | { |
| 1219 | extfrag_debug_root = debugfs_create_dir("extfrag", NULL); |
| 1220 | if (!extfrag_debug_root) |
| 1221 | return -ENOMEM; |
| 1222 | |
| 1223 | if (!debugfs_create_file("unusable_index", 0444, |
| 1224 | extfrag_debug_root, NULL, &unusable_file_ops)) |
| 1225 | return -ENOMEM; |
| 1226 | |
Mel Gorman | f1a5ab1 | 2010-05-24 14:32:26 -0700 | [diff] [blame] | 1227 | if (!debugfs_create_file("extfrag_index", 0444, |
| 1228 | extfrag_debug_root, NULL, &extfrag_file_ops)) |
| 1229 | return -ENOMEM; |
| 1230 | |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 1231 | return 0; |
| 1232 | } |
| 1233 | |
| 1234 | module_init(extfrag_debug_init); |
| 1235 | #endif |