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> |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 15 | #include <linux/cpu.h> |
Adrian Bunk | c748e13 | 2008-07-23 21:27:03 -0700 | [diff] [blame] | 16 | #include <linux/vmstat.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 17 | #include <linux/sched.h> |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 18 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 19 | #ifdef CONFIG_VM_EVENT_COUNTERS |
| 20 | DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}}; |
| 21 | EXPORT_PER_CPU_SYMBOL(vm_event_states); |
| 22 | |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 23 | static void sum_vm_events(unsigned long *ret, const struct cpumask *cpumask) |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 24 | { |
Christoph Lameter | 9eccf2a | 2008-02-04 22:29:22 -0800 | [diff] [blame] | 25 | int cpu; |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 26 | int i; |
| 27 | |
| 28 | memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long)); |
| 29 | |
Rusty Russell | aa85ea5 | 2009-03-30 22:05:15 -0600 | [diff] [blame] | 30 | for_each_cpu(cpu, cpumask) { |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 31 | struct vm_event_state *this = &per_cpu(vm_event_states, cpu); |
| 32 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 33 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) |
| 34 | ret[i] += this->event[i]; |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | /* |
| 39 | * Accumulate the vm event counters across all CPUs. |
| 40 | * The result is unavoidably approximate - it can change |
| 41 | * during and after execution of this function. |
| 42 | */ |
| 43 | void all_vm_events(unsigned long *ret) |
| 44 | { |
KOSAKI Motohiro | b5be113 | 2008-05-12 14:02:06 -0700 | [diff] [blame] | 45 | get_online_cpus(); |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 46 | sum_vm_events(ret, cpu_online_mask); |
KOSAKI Motohiro | b5be113 | 2008-05-12 14:02:06 -0700 | [diff] [blame] | 47 | put_online_cpus(); |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 48 | } |
Heiko Carstens | 32dd66f | 2006-07-10 04:44:31 -0700 | [diff] [blame] | 49 | EXPORT_SYMBOL_GPL(all_vm_events); |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 50 | |
| 51 | #ifdef CONFIG_HOTPLUG |
| 52 | /* |
| 53 | * Fold the foreign cpu events into our own. |
| 54 | * |
| 55 | * This is adding to the events on one processor |
| 56 | * but keeps the global counts constant. |
| 57 | */ |
| 58 | void vm_events_fold_cpu(int cpu) |
| 59 | { |
| 60 | struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu); |
| 61 | int i; |
| 62 | |
| 63 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) { |
| 64 | count_vm_events(i, fold_state->event[i]); |
| 65 | fold_state->event[i] = 0; |
| 66 | } |
| 67 | } |
| 68 | #endif /* CONFIG_HOTPLUG */ |
| 69 | |
| 70 | #endif /* CONFIG_VM_EVENT_COUNTERS */ |
| 71 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 72 | /* |
| 73 | * Manage combined zone based / global counters |
| 74 | * |
| 75 | * vm_stat contains the global counters |
| 76 | */ |
| 77 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; |
| 78 | EXPORT_SYMBOL(vm_stat); |
| 79 | |
| 80 | #ifdef CONFIG_SMP |
| 81 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 82 | static int calculate_threshold(struct zone *zone) |
| 83 | { |
| 84 | int threshold; |
| 85 | int mem; /* memory in 128 MB units */ |
| 86 | |
| 87 | /* |
| 88 | * The threshold scales with the number of processors and the amount |
| 89 | * of memory per zone. More memory means that we can defer updates for |
| 90 | * longer, more processors could lead to more contention. |
| 91 | * fls() is used to have a cheap way of logarithmic scaling. |
| 92 | * |
| 93 | * Some sample thresholds: |
| 94 | * |
| 95 | * Threshold Processors (fls) Zonesize fls(mem+1) |
| 96 | * ------------------------------------------------------------------ |
| 97 | * 8 1 1 0.9-1 GB 4 |
| 98 | * 16 2 2 0.9-1 GB 4 |
| 99 | * 20 2 2 1-2 GB 5 |
| 100 | * 24 2 2 2-4 GB 6 |
| 101 | * 28 2 2 4-8 GB 7 |
| 102 | * 32 2 2 8-16 GB 8 |
| 103 | * 4 2 2 <128M 1 |
| 104 | * 30 4 3 2-4 GB 5 |
| 105 | * 48 4 3 8-16 GB 8 |
| 106 | * 32 8 4 1-2 GB 4 |
| 107 | * 32 8 4 0.9-1GB 4 |
| 108 | * 10 16 5 <128M 1 |
| 109 | * 40 16 5 900M 4 |
| 110 | * 70 64 7 2-4 GB 5 |
| 111 | * 84 64 7 4-8 GB 6 |
| 112 | * 108 512 9 4-8 GB 6 |
| 113 | * 125 1024 10 8-16 GB 8 |
| 114 | * 125 1024 10 16-32 GB 9 |
| 115 | */ |
| 116 | |
| 117 | mem = zone->present_pages >> (27 - PAGE_SHIFT); |
| 118 | |
| 119 | threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem)); |
| 120 | |
| 121 | /* |
| 122 | * Maximum threshold is 125 |
| 123 | */ |
| 124 | threshold = min(125, threshold); |
| 125 | |
| 126 | return threshold; |
| 127 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 128 | |
| 129 | /* |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 130 | * Refresh the thresholds for each zone. |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 131 | */ |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 132 | static void refresh_zone_stat_thresholds(void) |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 133 | { |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 134 | struct zone *zone; |
| 135 | int cpu; |
| 136 | int threshold; |
| 137 | |
KOSAKI Motohiro | ee99c71 | 2009-03-31 15:19:31 -0700 | [diff] [blame] | 138 | for_each_populated_zone(zone) { |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 139 | threshold = calculate_threshold(zone); |
| 140 | |
| 141 | for_each_online_cpu(cpu) |
| 142 | zone_pcp(zone, cpu)->stat_threshold = threshold; |
| 143 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | /* |
| 147 | * For use when we know that interrupts are disabled. |
| 148 | */ |
| 149 | void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, |
| 150 | int delta) |
| 151 | { |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 152 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
| 153 | s8 *p = pcp->vm_stat_diff + item; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 154 | long x; |
| 155 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 156 | x = delta + *p; |
| 157 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 158 | if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) { |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 159 | zone_page_state_add(x, zone, item); |
| 160 | x = 0; |
| 161 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 162 | *p = x; |
| 163 | } |
| 164 | EXPORT_SYMBOL(__mod_zone_page_state); |
| 165 | |
| 166 | /* |
| 167 | * For an unknown interrupt state |
| 168 | */ |
| 169 | void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, |
| 170 | int delta) |
| 171 | { |
| 172 | unsigned long flags; |
| 173 | |
| 174 | local_irq_save(flags); |
| 175 | __mod_zone_page_state(zone, item, delta); |
| 176 | local_irq_restore(flags); |
| 177 | } |
| 178 | EXPORT_SYMBOL(mod_zone_page_state); |
| 179 | |
| 180 | /* |
| 181 | * Optimized increment and decrement functions. |
| 182 | * |
| 183 | * These are only for a single page and therefore can take a struct page * |
| 184 | * argument instead of struct zone *. This allows the inclusion of the code |
| 185 | * generated for page_zone(page) into the optimized functions. |
| 186 | * |
| 187 | * No overflow check is necessary and therefore the differential can be |
| 188 | * incremented or decremented in place which may allow the compilers to |
| 189 | * generate better code. |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 190 | * The increment or decrement is known and therefore one boundary check can |
| 191 | * be omitted. |
| 192 | * |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 193 | * NOTE: These functions are very performance sensitive. Change only |
| 194 | * with care. |
| 195 | * |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 196 | * Some processors have inc/dec instructions that are atomic vs an interrupt. |
| 197 | * However, the code must first determine the differential location in a zone |
| 198 | * based on the processor number and then inc/dec the counter. There is no |
| 199 | * guarantee without disabling preemption that the processor will not change |
| 200 | * in between and therefore the atomicity vs. interrupt cannot be exploited |
| 201 | * in a useful way here. |
| 202 | */ |
Christoph Lameter | c878538 | 2007-02-10 01:43:01 -0800 | [diff] [blame] | 203 | void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 204 | { |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 205 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
| 206 | s8 *p = pcp->vm_stat_diff + item; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 207 | |
| 208 | (*p)++; |
| 209 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 210 | if (unlikely(*p > pcp->stat_threshold)) { |
| 211 | int overstep = pcp->stat_threshold / 2; |
| 212 | |
| 213 | zone_page_state_add(*p + overstep, zone, item); |
| 214 | *p = -overstep; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 215 | } |
| 216 | } |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 217 | |
| 218 | void __inc_zone_page_state(struct page *page, enum zone_stat_item item) |
| 219 | { |
| 220 | __inc_zone_state(page_zone(page), item); |
| 221 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 222 | EXPORT_SYMBOL(__inc_zone_page_state); |
| 223 | |
Christoph Lameter | c878538 | 2007-02-10 01:43:01 -0800 | [diff] [blame] | 224 | void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 225 | { |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 226 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
| 227 | s8 *p = pcp->vm_stat_diff + item; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 228 | |
| 229 | (*p)--; |
| 230 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 231 | if (unlikely(*p < - pcp->stat_threshold)) { |
| 232 | int overstep = pcp->stat_threshold / 2; |
| 233 | |
| 234 | zone_page_state_add(*p - overstep, zone, item); |
| 235 | *p = overstep; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 236 | } |
| 237 | } |
Christoph Lameter | c878538 | 2007-02-10 01:43:01 -0800 | [diff] [blame] | 238 | |
| 239 | void __dec_zone_page_state(struct page *page, enum zone_stat_item item) |
| 240 | { |
| 241 | __dec_zone_state(page_zone(page), item); |
| 242 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 243 | EXPORT_SYMBOL(__dec_zone_page_state); |
| 244 | |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 245 | void inc_zone_state(struct zone *zone, enum zone_stat_item item) |
| 246 | { |
| 247 | unsigned long flags; |
| 248 | |
| 249 | local_irq_save(flags); |
| 250 | __inc_zone_state(zone, item); |
| 251 | local_irq_restore(flags); |
| 252 | } |
| 253 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 254 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
| 255 | { |
| 256 | unsigned long flags; |
| 257 | struct zone *zone; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 258 | |
| 259 | zone = page_zone(page); |
| 260 | local_irq_save(flags); |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 261 | __inc_zone_state(zone, item); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 262 | local_irq_restore(flags); |
| 263 | } |
| 264 | EXPORT_SYMBOL(inc_zone_page_state); |
| 265 | |
| 266 | void dec_zone_page_state(struct page *page, enum zone_stat_item item) |
| 267 | { |
| 268 | unsigned long flags; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 269 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 270 | local_irq_save(flags); |
Christoph Lameter | a302eb4 | 2006-08-31 21:27:34 -0700 | [diff] [blame] | 271 | __dec_zone_page_state(page, item); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 272 | local_irq_restore(flags); |
| 273 | } |
| 274 | EXPORT_SYMBOL(dec_zone_page_state); |
| 275 | |
| 276 | /* |
| 277 | * Update the zone counters for one cpu. |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 278 | * |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 279 | * The cpu specified must be either the current cpu or a processor that |
| 280 | * is not online. If it is the current cpu then the execution thread must |
| 281 | * be pinned to the current cpu. |
| 282 | * |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 283 | * Note that refresh_cpu_vm_stats strives to only access |
| 284 | * node local memory. The per cpu pagesets on remote zones are placed |
| 285 | * in the memory local to the processor using that pageset. So the |
| 286 | * loop over all zones will access a series of cachelines local to |
| 287 | * the processor. |
| 288 | * |
| 289 | * The call to zone_page_state_add updates the cachelines with the |
| 290 | * statistics in the remote zone struct as well as the global cachelines |
| 291 | * with the global counters. These could cause remote node cache line |
| 292 | * bouncing and will have to be only done when necessary. |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 293 | */ |
| 294 | void refresh_cpu_vm_stats(int cpu) |
| 295 | { |
| 296 | struct zone *zone; |
| 297 | int i; |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 298 | int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, }; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 299 | |
KOSAKI Motohiro | ee99c71 | 2009-03-31 15:19:31 -0700 | [diff] [blame] | 300 | for_each_populated_zone(zone) { |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 301 | struct per_cpu_pageset *p; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 302 | |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 303 | p = zone_pcp(zone, cpu); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 304 | |
| 305 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 306 | if (p->vm_stat_diff[i]) { |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 307 | unsigned long flags; |
| 308 | int v; |
| 309 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 310 | local_irq_save(flags); |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 311 | v = p->vm_stat_diff[i]; |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 312 | p->vm_stat_diff[i] = 0; |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 313 | local_irq_restore(flags); |
| 314 | atomic_long_add(v, &zone->vm_stat[i]); |
| 315 | global_diff[i] += v; |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 316 | #ifdef CONFIG_NUMA |
| 317 | /* 3 seconds idle till flush */ |
| 318 | p->expire = 3; |
| 319 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 320 | } |
Dimitri Sivanich | 468fd62 | 2008-04-28 02:13:37 -0700 | [diff] [blame] | 321 | cond_resched(); |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 322 | #ifdef CONFIG_NUMA |
| 323 | /* |
| 324 | * Deal with draining the remote pageset of this |
| 325 | * processor |
| 326 | * |
| 327 | * Check if there are pages remaining in this pageset |
| 328 | * if not then there is nothing to expire. |
| 329 | */ |
Christoph Lameter | 3dfa572 | 2008-02-04 22:29:19 -0800 | [diff] [blame] | 330 | if (!p->expire || !p->pcp.count) |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 331 | continue; |
| 332 | |
| 333 | /* |
| 334 | * We never drain zones local to this processor. |
| 335 | */ |
| 336 | if (zone_to_nid(zone) == numa_node_id()) { |
| 337 | p->expire = 0; |
| 338 | continue; |
| 339 | } |
| 340 | |
| 341 | p->expire--; |
| 342 | if (p->expire) |
| 343 | continue; |
| 344 | |
Christoph Lameter | 3dfa572 | 2008-02-04 22:29:19 -0800 | [diff] [blame] | 345 | if (p->pcp.count) |
| 346 | drain_zone_pages(zone, &p->pcp); |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 347 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 348 | } |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 349 | |
| 350 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 351 | if (global_diff[i]) |
| 352 | atomic_long_add(global_diff[i], &vm_stat[i]); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 353 | } |
| 354 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 355 | #endif |
| 356 | |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 357 | #ifdef CONFIG_NUMA |
| 358 | /* |
| 359 | * zonelist = the list of zones passed to the allocator |
| 360 | * z = the zone from which the allocation occurred. |
| 361 | * |
| 362 | * Must be called with interrupts disabled. |
| 363 | */ |
Mel Gorman | 18ea7e7 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 364 | void zone_statistics(struct zone *preferred_zone, struct zone *z) |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 365 | { |
Mel Gorman | 18ea7e7 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 366 | if (z->zone_pgdat == preferred_zone->zone_pgdat) { |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 367 | __inc_zone_state(z, NUMA_HIT); |
| 368 | } else { |
| 369 | __inc_zone_state(z, NUMA_MISS); |
Mel Gorman | 18ea7e7 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 370 | __inc_zone_state(preferred_zone, NUMA_FOREIGN); |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 371 | } |
Christoph Lameter | 5d29234 | 2006-09-27 01:50:10 -0700 | [diff] [blame] | 372 | if (z->node == numa_node_id()) |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 373 | __inc_zone_state(z, NUMA_LOCAL); |
| 374 | else |
| 375 | __inc_zone_state(z, NUMA_OTHER); |
| 376 | } |
| 377 | #endif |
| 378 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 379 | #ifdef CONFIG_PROC_FS |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 380 | #include <linux/proc_fs.h> |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 381 | #include <linux/seq_file.h> |
| 382 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 383 | static char * const migratetype_names[MIGRATE_TYPES] = { |
| 384 | "Unmovable", |
| 385 | "Reclaimable", |
| 386 | "Movable", |
| 387 | "Reserve", |
KOSAKI Motohiro | 91446b0 | 2008-04-15 14:34:42 -0700 | [diff] [blame] | 388 | "Isolate", |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 389 | }; |
| 390 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 391 | static void *frag_start(struct seq_file *m, loff_t *pos) |
| 392 | { |
| 393 | pg_data_t *pgdat; |
| 394 | loff_t node = *pos; |
| 395 | for (pgdat = first_online_pgdat(); |
| 396 | pgdat && node; |
| 397 | pgdat = next_online_pgdat(pgdat)) |
| 398 | --node; |
| 399 | |
| 400 | return pgdat; |
| 401 | } |
| 402 | |
| 403 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) |
| 404 | { |
| 405 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 406 | |
| 407 | (*pos)++; |
| 408 | return next_online_pgdat(pgdat); |
| 409 | } |
| 410 | |
| 411 | static void frag_stop(struct seq_file *m, void *arg) |
| 412 | { |
| 413 | } |
| 414 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 415 | /* Walk all the zones in a node and print using a callback */ |
| 416 | static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat, |
| 417 | void (*print)(struct seq_file *m, pg_data_t *, struct zone *)) |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 418 | { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 419 | struct zone *zone; |
| 420 | struct zone *node_zones = pgdat->node_zones; |
| 421 | unsigned long flags; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 422 | |
| 423 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { |
| 424 | if (!populated_zone(zone)) |
| 425 | continue; |
| 426 | |
| 427 | spin_lock_irqsave(&zone->lock, flags); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 428 | print(m, pgdat, zone); |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 429 | spin_unlock_irqrestore(&zone->lock, flags); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 430 | } |
| 431 | } |
| 432 | |
| 433 | static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, |
| 434 | struct zone *zone) |
| 435 | { |
| 436 | int order; |
| 437 | |
| 438 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); |
| 439 | for (order = 0; order < MAX_ORDER; ++order) |
| 440 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); |
| 441 | seq_putc(m, '\n'); |
| 442 | } |
| 443 | |
| 444 | /* |
| 445 | * This walks the free areas for each zone. |
| 446 | */ |
| 447 | static int frag_show(struct seq_file *m, void *arg) |
| 448 | { |
| 449 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 450 | walk_zones_in_node(m, pgdat, frag_show_print); |
| 451 | return 0; |
| 452 | } |
| 453 | |
| 454 | static void pagetypeinfo_showfree_print(struct seq_file *m, |
| 455 | pg_data_t *pgdat, struct zone *zone) |
| 456 | { |
| 457 | int order, mtype; |
| 458 | |
| 459 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) { |
| 460 | seq_printf(m, "Node %4d, zone %8s, type %12s ", |
| 461 | pgdat->node_id, |
| 462 | zone->name, |
| 463 | migratetype_names[mtype]); |
| 464 | for (order = 0; order < MAX_ORDER; ++order) { |
| 465 | unsigned long freecount = 0; |
| 466 | struct free_area *area; |
| 467 | struct list_head *curr; |
| 468 | |
| 469 | area = &(zone->free_area[order]); |
| 470 | |
| 471 | list_for_each(curr, &area->free_list[mtype]) |
| 472 | freecount++; |
| 473 | seq_printf(m, "%6lu ", freecount); |
| 474 | } |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 475 | seq_putc(m, '\n'); |
| 476 | } |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 477 | } |
| 478 | |
| 479 | /* Print out the free pages at each order for each migatetype */ |
| 480 | static int pagetypeinfo_showfree(struct seq_file *m, void *arg) |
| 481 | { |
| 482 | int order; |
| 483 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 484 | |
| 485 | /* Print header */ |
| 486 | seq_printf(m, "%-43s ", "Free pages count per migrate type at order"); |
| 487 | for (order = 0; order < MAX_ORDER; ++order) |
| 488 | seq_printf(m, "%6d ", order); |
| 489 | seq_putc(m, '\n'); |
| 490 | |
| 491 | walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print); |
| 492 | |
| 493 | return 0; |
| 494 | } |
| 495 | |
| 496 | static void pagetypeinfo_showblockcount_print(struct seq_file *m, |
| 497 | pg_data_t *pgdat, struct zone *zone) |
| 498 | { |
| 499 | int mtype; |
| 500 | unsigned long pfn; |
| 501 | unsigned long start_pfn = zone->zone_start_pfn; |
| 502 | unsigned long end_pfn = start_pfn + zone->spanned_pages; |
| 503 | unsigned long count[MIGRATE_TYPES] = { 0, }; |
| 504 | |
| 505 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { |
| 506 | struct page *page; |
| 507 | |
| 508 | if (!pfn_valid(pfn)) |
| 509 | continue; |
| 510 | |
| 511 | page = pfn_to_page(pfn); |
Mel Gorman | eb33575 | 2009-05-13 17:34:48 +0100 | [diff] [blame] | 512 | |
| 513 | /* Watch for unexpected holes punched in the memmap */ |
| 514 | if (!memmap_valid_within(pfn, page, zone)) |
Mel Gorman | e80d6a2 | 2008-08-14 11:10:14 +0100 | [diff] [blame] | 515 | continue; |
Mel Gorman | eb33575 | 2009-05-13 17:34:48 +0100 | [diff] [blame] | 516 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 517 | mtype = get_pageblock_migratetype(page); |
| 518 | |
Mel Gorman | e80d6a2 | 2008-08-14 11:10:14 +0100 | [diff] [blame] | 519 | if (mtype < MIGRATE_TYPES) |
| 520 | count[mtype]++; |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 521 | } |
| 522 | |
| 523 | /* Print counts */ |
| 524 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); |
| 525 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) |
| 526 | seq_printf(m, "%12lu ", count[mtype]); |
| 527 | seq_putc(m, '\n'); |
| 528 | } |
| 529 | |
| 530 | /* Print out the free pages at each order for each migratetype */ |
| 531 | static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg) |
| 532 | { |
| 533 | int mtype; |
| 534 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 535 | |
| 536 | seq_printf(m, "\n%-23s", "Number of blocks type "); |
| 537 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) |
| 538 | seq_printf(m, "%12s ", migratetype_names[mtype]); |
| 539 | seq_putc(m, '\n'); |
| 540 | walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print); |
| 541 | |
| 542 | return 0; |
| 543 | } |
| 544 | |
| 545 | /* |
| 546 | * This prints out statistics in relation to grouping pages by mobility. |
| 547 | * It is expensive to collect so do not constantly read the file. |
| 548 | */ |
| 549 | static int pagetypeinfo_show(struct seq_file *m, void *arg) |
| 550 | { |
| 551 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 552 | |
KOSAKI Motohiro | 41b25a3 | 2008-04-30 00:52:13 -0700 | [diff] [blame] | 553 | /* check memoryless node */ |
| 554 | if (!node_state(pgdat->node_id, N_HIGH_MEMORY)) |
| 555 | return 0; |
| 556 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 557 | seq_printf(m, "Page block order: %d\n", pageblock_order); |
| 558 | seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages); |
| 559 | seq_putc(m, '\n'); |
| 560 | pagetypeinfo_showfree(m, pgdat); |
| 561 | pagetypeinfo_showblockcount(m, pgdat); |
| 562 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 563 | return 0; |
| 564 | } |
| 565 | |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 566 | static const struct seq_operations fragmentation_op = { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 567 | .start = frag_start, |
| 568 | .next = frag_next, |
| 569 | .stop = frag_stop, |
| 570 | .show = frag_show, |
| 571 | }; |
| 572 | |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 573 | static int fragmentation_open(struct inode *inode, struct file *file) |
| 574 | { |
| 575 | return seq_open(file, &fragmentation_op); |
| 576 | } |
| 577 | |
| 578 | static const struct file_operations fragmentation_file_operations = { |
| 579 | .open = fragmentation_open, |
| 580 | .read = seq_read, |
| 581 | .llseek = seq_lseek, |
| 582 | .release = seq_release, |
| 583 | }; |
| 584 | |
Alexey Dobriyan | 74e2e8e | 2008-10-06 04:15:36 +0400 | [diff] [blame] | 585 | static const struct seq_operations pagetypeinfo_op = { |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 586 | .start = frag_start, |
| 587 | .next = frag_next, |
| 588 | .stop = frag_stop, |
| 589 | .show = pagetypeinfo_show, |
| 590 | }; |
| 591 | |
Alexey Dobriyan | 74e2e8e | 2008-10-06 04:15:36 +0400 | [diff] [blame] | 592 | static int pagetypeinfo_open(struct inode *inode, struct file *file) |
| 593 | { |
| 594 | return seq_open(file, &pagetypeinfo_op); |
| 595 | } |
| 596 | |
| 597 | static const struct file_operations pagetypeinfo_file_ops = { |
| 598 | .open = pagetypeinfo_open, |
| 599 | .read = seq_read, |
| 600 | .llseek = seq_lseek, |
| 601 | .release = seq_release, |
| 602 | }; |
| 603 | |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 604 | #ifdef CONFIG_ZONE_DMA |
| 605 | #define TEXT_FOR_DMA(xx) xx "_dma", |
| 606 | #else |
| 607 | #define TEXT_FOR_DMA(xx) |
| 608 | #endif |
| 609 | |
Christoph Lameter | 27bf71c | 2006-09-25 23:31:15 -0700 | [diff] [blame] | 610 | #ifdef CONFIG_ZONE_DMA32 |
| 611 | #define TEXT_FOR_DMA32(xx) xx "_dma32", |
| 612 | #else |
| 613 | #define TEXT_FOR_DMA32(xx) |
| 614 | #endif |
| 615 | |
| 616 | #ifdef CONFIG_HIGHMEM |
| 617 | #define TEXT_FOR_HIGHMEM(xx) xx "_high", |
| 618 | #else |
| 619 | #define TEXT_FOR_HIGHMEM(xx) |
| 620 | #endif |
| 621 | |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 622 | #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] | 623 | TEXT_FOR_HIGHMEM(xx) xx "_movable", |
Christoph Lameter | 27bf71c | 2006-09-25 23:31:15 -0700 | [diff] [blame] | 624 | |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 625 | static const char * const vmstat_text[] = { |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 626 | /* Zoned VM counters */ |
Christoph Lameter | d23ad42 | 2007-02-10 01:43:02 -0800 | [diff] [blame] | 627 | "nr_free_pages", |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 628 | "nr_inactive_anon", |
| 629 | "nr_active_anon", |
| 630 | "nr_inactive_file", |
| 631 | "nr_active_file", |
Lee Schermerhorn | 7b85412 | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 632 | "nr_unevictable", |
Nick Piggin | 5344b7e | 2008-10-18 20:26:51 -0700 | [diff] [blame] | 633 | "nr_mlock", |
Christoph Lameter | f3dbd34 | 2006-06-30 01:55:36 -0700 | [diff] [blame] | 634 | "nr_anon_pages", |
Christoph Lameter | 65ba55f | 2006-06-30 01:55:34 -0700 | [diff] [blame] | 635 | "nr_mapped", |
Christoph Lameter | 347ce43 | 2006-06-30 01:55:35 -0700 | [diff] [blame] | 636 | "nr_file_pages", |
Christoph Lameter | 51ed449 | 2007-02-10 01:43:02 -0800 | [diff] [blame] | 637 | "nr_dirty", |
| 638 | "nr_writeback", |
Christoph Lameter | 972d1a7 | 2006-09-25 23:31:51 -0700 | [diff] [blame] | 639 | "nr_slab_reclaimable", |
| 640 | "nr_slab_unreclaimable", |
Christoph Lameter | df849a1 | 2006-06-30 01:55:38 -0700 | [diff] [blame] | 641 | "nr_page_table_pages", |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 642 | "nr_unstable", |
Christoph Lameter | d2c5e30 | 2006-06-30 01:55:41 -0700 | [diff] [blame] | 643 | "nr_bounce", |
Andrew Morton | e129b5c | 2006-09-27 01:50:00 -0700 | [diff] [blame] | 644 | "nr_vmscan_write", |
Miklos Szeredi | fc3ba69 | 2008-04-30 00:54:38 -0700 | [diff] [blame] | 645 | "nr_writeback_temp", |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 646 | |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 647 | #ifdef CONFIG_NUMA |
| 648 | "numa_hit", |
| 649 | "numa_miss", |
| 650 | "numa_foreign", |
| 651 | "numa_interleave", |
| 652 | "numa_local", |
| 653 | "numa_other", |
| 654 | #endif |
| 655 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 656 | #ifdef CONFIG_VM_EVENT_COUNTERS |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 657 | "pgpgin", |
| 658 | "pgpgout", |
| 659 | "pswpin", |
| 660 | "pswpout", |
| 661 | |
Christoph Lameter | 27bf71c | 2006-09-25 23:31:15 -0700 | [diff] [blame] | 662 | TEXTS_FOR_ZONES("pgalloc") |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 663 | |
| 664 | "pgfree", |
| 665 | "pgactivate", |
| 666 | "pgdeactivate", |
| 667 | |
| 668 | "pgfault", |
| 669 | "pgmajfault", |
| 670 | |
Christoph Lameter | 27bf71c | 2006-09-25 23:31:15 -0700 | [diff] [blame] | 671 | TEXTS_FOR_ZONES("pgrefill") |
| 672 | TEXTS_FOR_ZONES("pgsteal") |
| 673 | TEXTS_FOR_ZONES("pgscan_kswapd") |
| 674 | TEXTS_FOR_ZONES("pgscan_direct") |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 675 | |
| 676 | "pginodesteal", |
| 677 | "slabs_scanned", |
| 678 | "kswapd_steal", |
| 679 | "kswapd_inodesteal", |
| 680 | "pageoutrun", |
| 681 | "allocstall", |
| 682 | |
| 683 | "pgrotated", |
Adam Litke | 3b11630 | 2008-04-28 02:13:06 -0700 | [diff] [blame] | 684 | #ifdef CONFIG_HUGETLB_PAGE |
| 685 | "htlb_buddy_alloc_success", |
| 686 | "htlb_buddy_alloc_fail", |
| 687 | #endif |
Lee Schermerhorn | bbfd28e | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 688 | "unevictable_pgs_culled", |
| 689 | "unevictable_pgs_scanned", |
| 690 | "unevictable_pgs_rescued", |
Nick Piggin | 5344b7e | 2008-10-18 20:26:51 -0700 | [diff] [blame] | 691 | "unevictable_pgs_mlocked", |
| 692 | "unevictable_pgs_munlocked", |
| 693 | "unevictable_pgs_cleared", |
| 694 | "unevictable_pgs_stranded", |
Lee Schermerhorn | 985737c | 2008-10-18 20:26:53 -0700 | [diff] [blame] | 695 | "unevictable_pgs_mlockfreed", |
Lee Schermerhorn | bbfd28e | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 696 | #endif |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 697 | }; |
| 698 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 699 | static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, |
| 700 | struct zone *zone) |
| 701 | { |
| 702 | int i; |
| 703 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); |
| 704 | seq_printf(m, |
| 705 | "\n pages free %lu" |
| 706 | "\n min %lu" |
| 707 | "\n low %lu" |
| 708 | "\n high %lu" |
Wu Fengguang | 08d9ae7 | 2009-06-16 15:32:30 -0700 | [diff] [blame] | 709 | "\n scanned %lu" |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 710 | "\n spanned %lu" |
| 711 | "\n present %lu", |
| 712 | zone_page_state(zone, NR_FREE_PAGES), |
Mel Gorman | 4185896 | 2009-06-16 15:32:12 -0700 | [diff] [blame] | 713 | min_wmark_pages(zone), |
| 714 | low_wmark_pages(zone), |
| 715 | high_wmark_pages(zone), |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 716 | zone->pages_scanned, |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 717 | zone->spanned_pages, |
| 718 | zone->present_pages); |
| 719 | |
| 720 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 721 | seq_printf(m, "\n %-12s %lu", vmstat_text[i], |
| 722 | zone_page_state(zone, i)); |
| 723 | |
| 724 | seq_printf(m, |
| 725 | "\n protection: (%lu", |
| 726 | zone->lowmem_reserve[0]); |
| 727 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) |
| 728 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); |
| 729 | seq_printf(m, |
| 730 | ")" |
| 731 | "\n pagesets"); |
| 732 | for_each_online_cpu(i) { |
| 733 | struct per_cpu_pageset *pageset; |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 734 | |
| 735 | pageset = zone_pcp(zone, i); |
Christoph Lameter | 3dfa572 | 2008-02-04 22:29:19 -0800 | [diff] [blame] | 736 | seq_printf(m, |
| 737 | "\n cpu: %i" |
| 738 | "\n count: %i" |
| 739 | "\n high: %i" |
| 740 | "\n batch: %i", |
| 741 | i, |
| 742 | pageset->pcp.count, |
| 743 | pageset->pcp.high, |
| 744 | pageset->pcp.batch); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 745 | #ifdef CONFIG_SMP |
| 746 | seq_printf(m, "\n vm stats threshold: %d", |
| 747 | pageset->stat_threshold); |
| 748 | #endif |
| 749 | } |
| 750 | seq_printf(m, |
| 751 | "\n all_unreclaimable: %u" |
| 752 | "\n prev_priority: %i" |
Rik van Riel | 556adec | 2008-10-18 20:26:34 -0700 | [diff] [blame] | 753 | "\n start_pfn: %lu" |
| 754 | "\n inactive_ratio: %u", |
David Rientjes | e815af9 | 2007-10-16 23:25:54 -0700 | [diff] [blame] | 755 | zone_is_all_unreclaimable(zone), |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 756 | zone->prev_priority, |
Rik van Riel | 556adec | 2008-10-18 20:26:34 -0700 | [diff] [blame] | 757 | zone->zone_start_pfn, |
| 758 | zone->inactive_ratio); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 759 | seq_putc(m, '\n'); |
| 760 | } |
| 761 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 762 | /* |
| 763 | * Output information about zones in @pgdat. |
| 764 | */ |
| 765 | static int zoneinfo_show(struct seq_file *m, void *arg) |
| 766 | { |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 767 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 768 | walk_zones_in_node(m, pgdat, zoneinfo_show_print); |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 769 | return 0; |
| 770 | } |
| 771 | |
Alexey Dobriyan | 5c9fe62 | 2008-10-06 04:19:42 +0400 | [diff] [blame] | 772 | static const struct seq_operations zoneinfo_op = { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 773 | .start = frag_start, /* iterate over all zones. The same as in |
| 774 | * fragmentation. */ |
| 775 | .next = frag_next, |
| 776 | .stop = frag_stop, |
| 777 | .show = zoneinfo_show, |
| 778 | }; |
| 779 | |
Alexey Dobriyan | 5c9fe62 | 2008-10-06 04:19:42 +0400 | [diff] [blame] | 780 | static int zoneinfo_open(struct inode *inode, struct file *file) |
| 781 | { |
| 782 | return seq_open(file, &zoneinfo_op); |
| 783 | } |
| 784 | |
| 785 | static const struct file_operations proc_zoneinfo_file_operations = { |
| 786 | .open = zoneinfo_open, |
| 787 | .read = seq_read, |
| 788 | .llseek = seq_lseek, |
| 789 | .release = seq_release, |
| 790 | }; |
| 791 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 792 | static void *vmstat_start(struct seq_file *m, loff_t *pos) |
| 793 | { |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 794 | unsigned long *v; |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 795 | #ifdef CONFIG_VM_EVENT_COUNTERS |
| 796 | unsigned long *e; |
| 797 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 798 | int i; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 799 | |
| 800 | if (*pos >= ARRAY_SIZE(vmstat_text)) |
| 801 | return NULL; |
| 802 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 803 | #ifdef CONFIG_VM_EVENT_COUNTERS |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 804 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 805 | + sizeof(struct vm_event_state), GFP_KERNEL); |
| 806 | #else |
| 807 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long), |
| 808 | GFP_KERNEL); |
| 809 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 810 | m->private = v; |
| 811 | if (!v) |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 812 | return ERR_PTR(-ENOMEM); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 813 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 814 | v[i] = global_page_state(i); |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 815 | #ifdef CONFIG_VM_EVENT_COUNTERS |
| 816 | e = v + NR_VM_ZONE_STAT_ITEMS; |
| 817 | all_vm_events(e); |
| 818 | e[PGPGIN] /= 2; /* sectors -> kbytes */ |
| 819 | e[PGPGOUT] /= 2; |
| 820 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 821 | return v + *pos; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 822 | } |
| 823 | |
| 824 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) |
| 825 | { |
| 826 | (*pos)++; |
| 827 | if (*pos >= ARRAY_SIZE(vmstat_text)) |
| 828 | return NULL; |
| 829 | return (unsigned long *)m->private + *pos; |
| 830 | } |
| 831 | |
| 832 | static int vmstat_show(struct seq_file *m, void *arg) |
| 833 | { |
| 834 | unsigned long *l = arg; |
| 835 | unsigned long off = l - (unsigned long *)m->private; |
| 836 | |
| 837 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); |
| 838 | return 0; |
| 839 | } |
| 840 | |
| 841 | static void vmstat_stop(struct seq_file *m, void *arg) |
| 842 | { |
| 843 | kfree(m->private); |
| 844 | m->private = NULL; |
| 845 | } |
| 846 | |
Alexey Dobriyan | b6aa44a | 2008-10-06 04:17:48 +0400 | [diff] [blame] | 847 | static const struct seq_operations vmstat_op = { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 848 | .start = vmstat_start, |
| 849 | .next = vmstat_next, |
| 850 | .stop = vmstat_stop, |
| 851 | .show = vmstat_show, |
| 852 | }; |
| 853 | |
Alexey Dobriyan | b6aa44a | 2008-10-06 04:17:48 +0400 | [diff] [blame] | 854 | static int vmstat_open(struct inode *inode, struct file *file) |
| 855 | { |
| 856 | return seq_open(file, &vmstat_op); |
| 857 | } |
| 858 | |
| 859 | static const struct file_operations proc_vmstat_file_operations = { |
| 860 | .open = vmstat_open, |
| 861 | .read = seq_read, |
| 862 | .llseek = seq_lseek, |
| 863 | .release = seq_release, |
| 864 | }; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 865 | #endif /* CONFIG_PROC_FS */ |
| 866 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 867 | #ifdef CONFIG_SMP |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 868 | static DEFINE_PER_CPU(struct delayed_work, vmstat_work); |
Christoph Lameter | 77461ab | 2007-05-09 02:35:13 -0700 | [diff] [blame] | 869 | int sysctl_stat_interval __read_mostly = HZ; |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 870 | |
| 871 | static void vmstat_update(struct work_struct *w) |
| 872 | { |
| 873 | refresh_cpu_vm_stats(smp_processor_id()); |
Christoph Lameter | 77461ab | 2007-05-09 02:35:13 -0700 | [diff] [blame] | 874 | schedule_delayed_work(&__get_cpu_var(vmstat_work), |
Anton Blanchard | 98f4ebb | 2009-04-02 16:56:39 -0700 | [diff] [blame] | 875 | round_jiffies_relative(sysctl_stat_interval)); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 876 | } |
| 877 | |
Randy Dunlap | 42614fc | 2007-11-14 17:00:12 -0800 | [diff] [blame] | 878 | static void __cpuinit start_cpu_timer(int cpu) |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 879 | { |
| 880 | struct delayed_work *vmstat_work = &per_cpu(vmstat_work, cpu); |
| 881 | |
Christoph Lameter | 39bf627 | 2007-05-10 22:22:21 -0700 | [diff] [blame] | 882 | INIT_DELAYED_WORK_DEFERRABLE(vmstat_work, vmstat_update); |
Anton Blanchard | 98f4ebb | 2009-04-02 16:56:39 -0700 | [diff] [blame] | 883 | schedule_delayed_work_on(cpu, vmstat_work, |
| 884 | __round_jiffies_relative(HZ, cpu)); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 885 | } |
| 886 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 887 | /* |
| 888 | * Use the cpu notifier to insure that the thresholds are recalculated |
| 889 | * when necessary. |
| 890 | */ |
| 891 | static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb, |
| 892 | unsigned long action, |
| 893 | void *hcpu) |
| 894 | { |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 895 | long cpu = (long)hcpu; |
| 896 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 897 | switch (action) { |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 898 | case CPU_ONLINE: |
| 899 | case CPU_ONLINE_FROZEN: |
| 900 | start_cpu_timer(cpu); |
| 901 | break; |
| 902 | case CPU_DOWN_PREPARE: |
| 903 | case CPU_DOWN_PREPARE_FROZEN: |
| 904 | cancel_rearming_delayed_work(&per_cpu(vmstat_work, cpu)); |
| 905 | per_cpu(vmstat_work, cpu).work.func = NULL; |
| 906 | break; |
| 907 | case CPU_DOWN_FAILED: |
| 908 | case CPU_DOWN_FAILED_FROZEN: |
| 909 | start_cpu_timer(cpu); |
| 910 | break; |
Andy Whitcroft | ce421c7 | 2006-12-06 20:33:08 -0800 | [diff] [blame] | 911 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 912 | case CPU_DEAD_FROZEN: |
Andy Whitcroft | ce421c7 | 2006-12-06 20:33:08 -0800 | [diff] [blame] | 913 | refresh_zone_stat_thresholds(); |
| 914 | break; |
| 915 | default: |
| 916 | break; |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 917 | } |
| 918 | return NOTIFY_OK; |
| 919 | } |
| 920 | |
| 921 | static struct notifier_block __cpuinitdata vmstat_notifier = |
| 922 | { &vmstat_cpuup_callback, NULL, 0 }; |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 923 | #endif |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 924 | |
Adrian Bunk | e2fc88d | 2007-10-16 01:26:27 -0700 | [diff] [blame] | 925 | static int __init setup_vmstat(void) |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 926 | { |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 927 | #ifdef CONFIG_SMP |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 928 | int cpu; |
| 929 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 930 | refresh_zone_stat_thresholds(); |
| 931 | register_cpu_notifier(&vmstat_notifier); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 932 | |
| 933 | for_each_online_cpu(cpu) |
| 934 | start_cpu_timer(cpu); |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 935 | #endif |
| 936 | #ifdef CONFIG_PROC_FS |
| 937 | proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations); |
Alexey Dobriyan | 74e2e8e | 2008-10-06 04:15:36 +0400 | [diff] [blame] | 938 | proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops); |
Alexey Dobriyan | b6aa44a | 2008-10-06 04:17:48 +0400 | [diff] [blame] | 939 | proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations); |
Alexey Dobriyan | 5c9fe62 | 2008-10-06 04:19:42 +0400 | [diff] [blame] | 940 | proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations); |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 941 | #endif |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 942 | return 0; |
| 943 | } |
| 944 | module_init(setup_vmstat) |