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 | */ |
| 11 | |
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 | |
| 23 | static void sum_vm_events(unsigned long *ret, cpumask_t *cpumask) |
| 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 | |
Mike Travis | 6d6a436 | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 30 | for_each_cpu_mask_nr(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(); |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 46 | sum_vm_events(ret, &cpu_online_map); |
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 | |
| 138 | for_each_zone(zone) { |
| 139 | |
| 140 | if (!zone->present_pages) |
| 141 | continue; |
| 142 | |
| 143 | threshold = calculate_threshold(zone); |
| 144 | |
| 145 | for_each_online_cpu(cpu) |
| 146 | zone_pcp(zone, cpu)->stat_threshold = threshold; |
| 147 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | /* |
| 151 | * For use when we know that interrupts are disabled. |
| 152 | */ |
| 153 | void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, |
| 154 | int delta) |
| 155 | { |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 156 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
| 157 | s8 *p = pcp->vm_stat_diff + item; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 158 | long x; |
| 159 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 160 | x = delta + *p; |
| 161 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 162 | if (unlikely(x > pcp->stat_threshold || x < -pcp->stat_threshold)) { |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 163 | zone_page_state_add(x, zone, item); |
| 164 | x = 0; |
| 165 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 166 | *p = x; |
| 167 | } |
| 168 | EXPORT_SYMBOL(__mod_zone_page_state); |
| 169 | |
| 170 | /* |
| 171 | * For an unknown interrupt state |
| 172 | */ |
| 173 | void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, |
| 174 | int delta) |
| 175 | { |
| 176 | unsigned long flags; |
| 177 | |
| 178 | local_irq_save(flags); |
| 179 | __mod_zone_page_state(zone, item, delta); |
| 180 | local_irq_restore(flags); |
| 181 | } |
| 182 | EXPORT_SYMBOL(mod_zone_page_state); |
| 183 | |
| 184 | /* |
| 185 | * Optimized increment and decrement functions. |
| 186 | * |
| 187 | * These are only for a single page and therefore can take a struct page * |
| 188 | * argument instead of struct zone *. This allows the inclusion of the code |
| 189 | * generated for page_zone(page) into the optimized functions. |
| 190 | * |
| 191 | * No overflow check is necessary and therefore the differential can be |
| 192 | * incremented or decremented in place which may allow the compilers to |
| 193 | * generate better code. |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 194 | * The increment or decrement is known and therefore one boundary check can |
| 195 | * be omitted. |
| 196 | * |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 197 | * NOTE: These functions are very performance sensitive. Change only |
| 198 | * with care. |
| 199 | * |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 200 | * Some processors have inc/dec instructions that are atomic vs an interrupt. |
| 201 | * However, the code must first determine the differential location in a zone |
| 202 | * based on the processor number and then inc/dec the counter. There is no |
| 203 | * guarantee without disabling preemption that the processor will not change |
| 204 | * in between and therefore the atomicity vs. interrupt cannot be exploited |
| 205 | * in a useful way here. |
| 206 | */ |
Christoph Lameter | c878538 | 2007-02-10 01:43:01 -0800 | [diff] [blame] | 207 | void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 208 | { |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 209 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
| 210 | s8 *p = pcp->vm_stat_diff + item; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 211 | |
| 212 | (*p)++; |
| 213 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 214 | if (unlikely(*p > pcp->stat_threshold)) { |
| 215 | int overstep = pcp->stat_threshold / 2; |
| 216 | |
| 217 | zone_page_state_add(*p + overstep, zone, item); |
| 218 | *p = -overstep; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 219 | } |
| 220 | } |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 221 | |
| 222 | void __inc_zone_page_state(struct page *page, enum zone_stat_item item) |
| 223 | { |
| 224 | __inc_zone_state(page_zone(page), item); |
| 225 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 226 | EXPORT_SYMBOL(__inc_zone_page_state); |
| 227 | |
Christoph Lameter | c878538 | 2007-02-10 01:43:01 -0800 | [diff] [blame] | 228 | void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 229 | { |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 230 | struct per_cpu_pageset *pcp = zone_pcp(zone, smp_processor_id()); |
| 231 | s8 *p = pcp->vm_stat_diff + item; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 232 | |
| 233 | (*p)--; |
| 234 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 235 | if (unlikely(*p < - pcp->stat_threshold)) { |
| 236 | int overstep = pcp->stat_threshold / 2; |
| 237 | |
| 238 | zone_page_state_add(*p - overstep, zone, item); |
| 239 | *p = overstep; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 240 | } |
| 241 | } |
Christoph Lameter | c878538 | 2007-02-10 01:43:01 -0800 | [diff] [blame] | 242 | |
| 243 | void __dec_zone_page_state(struct page *page, enum zone_stat_item item) |
| 244 | { |
| 245 | __dec_zone_state(page_zone(page), item); |
| 246 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 247 | EXPORT_SYMBOL(__dec_zone_page_state); |
| 248 | |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 249 | void inc_zone_state(struct zone *zone, enum zone_stat_item item) |
| 250 | { |
| 251 | unsigned long flags; |
| 252 | |
| 253 | local_irq_save(flags); |
| 254 | __inc_zone_state(zone, item); |
| 255 | local_irq_restore(flags); |
| 256 | } |
| 257 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 258 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
| 259 | { |
| 260 | unsigned long flags; |
| 261 | struct zone *zone; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 262 | |
| 263 | zone = page_zone(page); |
| 264 | local_irq_save(flags); |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 265 | __inc_zone_state(zone, item); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 266 | local_irq_restore(flags); |
| 267 | } |
| 268 | EXPORT_SYMBOL(inc_zone_page_state); |
| 269 | |
| 270 | void dec_zone_page_state(struct page *page, enum zone_stat_item item) |
| 271 | { |
| 272 | unsigned long flags; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 273 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 274 | local_irq_save(flags); |
Christoph Lameter | a302eb4 | 2006-08-31 21:27:34 -0700 | [diff] [blame] | 275 | __dec_zone_page_state(page, item); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 276 | local_irq_restore(flags); |
| 277 | } |
| 278 | EXPORT_SYMBOL(dec_zone_page_state); |
| 279 | |
| 280 | /* |
| 281 | * Update the zone counters for one cpu. |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 282 | * |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 283 | * The cpu specified must be either the current cpu or a processor that |
| 284 | * is not online. If it is the current cpu then the execution thread must |
| 285 | * be pinned to the current cpu. |
| 286 | * |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 287 | * Note that refresh_cpu_vm_stats strives to only access |
| 288 | * node local memory. The per cpu pagesets on remote zones are placed |
| 289 | * in the memory local to the processor using that pageset. So the |
| 290 | * loop over all zones will access a series of cachelines local to |
| 291 | * the processor. |
| 292 | * |
| 293 | * The call to zone_page_state_add updates the cachelines with the |
| 294 | * statistics in the remote zone struct as well as the global cachelines |
| 295 | * with the global counters. These could cause remote node cache line |
| 296 | * bouncing and will have to be only done when necessary. |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 297 | */ |
| 298 | void refresh_cpu_vm_stats(int cpu) |
| 299 | { |
| 300 | struct zone *zone; |
| 301 | int i; |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 302 | int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, }; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 303 | |
| 304 | for_each_zone(zone) { |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 305 | struct per_cpu_pageset *p; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 306 | |
Christoph Lameter | 39bbcb8 | 2006-09-25 23:31:49 -0700 | [diff] [blame] | 307 | if (!populated_zone(zone)) |
| 308 | continue; |
| 309 | |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 310 | p = zone_pcp(zone, cpu); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 311 | |
| 312 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 313 | if (p->vm_stat_diff[i]) { |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 314 | unsigned long flags; |
| 315 | int v; |
| 316 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 317 | local_irq_save(flags); |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 318 | v = p->vm_stat_diff[i]; |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 319 | p->vm_stat_diff[i] = 0; |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 320 | local_irq_restore(flags); |
| 321 | atomic_long_add(v, &zone->vm_stat[i]); |
| 322 | global_diff[i] += v; |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 323 | #ifdef CONFIG_NUMA |
| 324 | /* 3 seconds idle till flush */ |
| 325 | p->expire = 3; |
| 326 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 327 | } |
Dimitri Sivanich | 468fd62 | 2008-04-28 02:13:37 -0700 | [diff] [blame] | 328 | cond_resched(); |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 329 | #ifdef CONFIG_NUMA |
| 330 | /* |
| 331 | * Deal with draining the remote pageset of this |
| 332 | * processor |
| 333 | * |
| 334 | * Check if there are pages remaining in this pageset |
| 335 | * if not then there is nothing to expire. |
| 336 | */ |
Christoph Lameter | 3dfa572 | 2008-02-04 22:29:19 -0800 | [diff] [blame] | 337 | if (!p->expire || !p->pcp.count) |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 338 | continue; |
| 339 | |
| 340 | /* |
| 341 | * We never drain zones local to this processor. |
| 342 | */ |
| 343 | if (zone_to_nid(zone) == numa_node_id()) { |
| 344 | p->expire = 0; |
| 345 | continue; |
| 346 | } |
| 347 | |
| 348 | p->expire--; |
| 349 | if (p->expire) |
| 350 | continue; |
| 351 | |
Christoph Lameter | 3dfa572 | 2008-02-04 22:29:19 -0800 | [diff] [blame] | 352 | if (p->pcp.count) |
| 353 | drain_zone_pages(zone, &p->pcp); |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 354 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 355 | } |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 356 | |
| 357 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 358 | if (global_diff[i]) |
| 359 | atomic_long_add(global_diff[i], &vm_stat[i]); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 360 | } |
| 361 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 362 | #endif |
| 363 | |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 364 | #ifdef CONFIG_NUMA |
| 365 | /* |
| 366 | * zonelist = the list of zones passed to the allocator |
| 367 | * z = the zone from which the allocation occurred. |
| 368 | * |
| 369 | * Must be called with interrupts disabled. |
| 370 | */ |
Mel Gorman | 18ea7e7 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 371 | void zone_statistics(struct zone *preferred_zone, struct zone *z) |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 372 | { |
Mel Gorman | 18ea7e7 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 373 | if (z->zone_pgdat == preferred_zone->zone_pgdat) { |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 374 | __inc_zone_state(z, NUMA_HIT); |
| 375 | } else { |
| 376 | __inc_zone_state(z, NUMA_MISS); |
Mel Gorman | 18ea7e7 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 377 | __inc_zone_state(preferred_zone, NUMA_FOREIGN); |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 378 | } |
Christoph Lameter | 5d29234 | 2006-09-27 01:50:10 -0700 | [diff] [blame] | 379 | if (z->node == numa_node_id()) |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 380 | __inc_zone_state(z, NUMA_LOCAL); |
| 381 | else |
| 382 | __inc_zone_state(z, NUMA_OTHER); |
| 383 | } |
| 384 | #endif |
| 385 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 386 | #ifdef CONFIG_PROC_FS |
| 387 | |
| 388 | #include <linux/seq_file.h> |
| 389 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 390 | static char * const migratetype_names[MIGRATE_TYPES] = { |
| 391 | "Unmovable", |
| 392 | "Reclaimable", |
| 393 | "Movable", |
| 394 | "Reserve", |
KOSAKI Motohiro | 91446b0 | 2008-04-15 14:34:42 -0700 | [diff] [blame] | 395 | "Isolate", |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 396 | }; |
| 397 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 398 | static void *frag_start(struct seq_file *m, loff_t *pos) |
| 399 | { |
| 400 | pg_data_t *pgdat; |
| 401 | loff_t node = *pos; |
| 402 | for (pgdat = first_online_pgdat(); |
| 403 | pgdat && node; |
| 404 | pgdat = next_online_pgdat(pgdat)) |
| 405 | --node; |
| 406 | |
| 407 | return pgdat; |
| 408 | } |
| 409 | |
| 410 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) |
| 411 | { |
| 412 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 413 | |
| 414 | (*pos)++; |
| 415 | return next_online_pgdat(pgdat); |
| 416 | } |
| 417 | |
| 418 | static void frag_stop(struct seq_file *m, void *arg) |
| 419 | { |
| 420 | } |
| 421 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 422 | /* Walk all the zones in a node and print using a callback */ |
| 423 | static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat, |
| 424 | void (*print)(struct seq_file *m, pg_data_t *, struct zone *)) |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 425 | { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 426 | struct zone *zone; |
| 427 | struct zone *node_zones = pgdat->node_zones; |
| 428 | unsigned long flags; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 429 | |
| 430 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { |
| 431 | if (!populated_zone(zone)) |
| 432 | continue; |
| 433 | |
| 434 | spin_lock_irqsave(&zone->lock, flags); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 435 | print(m, pgdat, zone); |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 436 | spin_unlock_irqrestore(&zone->lock, flags); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 437 | } |
| 438 | } |
| 439 | |
| 440 | static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, |
| 441 | struct zone *zone) |
| 442 | { |
| 443 | int order; |
| 444 | |
| 445 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); |
| 446 | for (order = 0; order < MAX_ORDER; ++order) |
| 447 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); |
| 448 | seq_putc(m, '\n'); |
| 449 | } |
| 450 | |
| 451 | /* |
| 452 | * This walks the free areas for each zone. |
| 453 | */ |
| 454 | static int frag_show(struct seq_file *m, void *arg) |
| 455 | { |
| 456 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 457 | walk_zones_in_node(m, pgdat, frag_show_print); |
| 458 | return 0; |
| 459 | } |
| 460 | |
| 461 | static void pagetypeinfo_showfree_print(struct seq_file *m, |
| 462 | pg_data_t *pgdat, struct zone *zone) |
| 463 | { |
| 464 | int order, mtype; |
| 465 | |
| 466 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) { |
| 467 | seq_printf(m, "Node %4d, zone %8s, type %12s ", |
| 468 | pgdat->node_id, |
| 469 | zone->name, |
| 470 | migratetype_names[mtype]); |
| 471 | for (order = 0; order < MAX_ORDER; ++order) { |
| 472 | unsigned long freecount = 0; |
| 473 | struct free_area *area; |
| 474 | struct list_head *curr; |
| 475 | |
| 476 | area = &(zone->free_area[order]); |
| 477 | |
| 478 | list_for_each(curr, &area->free_list[mtype]) |
| 479 | freecount++; |
| 480 | seq_printf(m, "%6lu ", freecount); |
| 481 | } |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 482 | seq_putc(m, '\n'); |
| 483 | } |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 484 | } |
| 485 | |
| 486 | /* Print out the free pages at each order for each migatetype */ |
| 487 | static int pagetypeinfo_showfree(struct seq_file *m, void *arg) |
| 488 | { |
| 489 | int order; |
| 490 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 491 | |
| 492 | /* Print header */ |
| 493 | seq_printf(m, "%-43s ", "Free pages count per migrate type at order"); |
| 494 | for (order = 0; order < MAX_ORDER; ++order) |
| 495 | seq_printf(m, "%6d ", order); |
| 496 | seq_putc(m, '\n'); |
| 497 | |
| 498 | walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print); |
| 499 | |
| 500 | return 0; |
| 501 | } |
| 502 | |
| 503 | static void pagetypeinfo_showblockcount_print(struct seq_file *m, |
| 504 | pg_data_t *pgdat, struct zone *zone) |
| 505 | { |
| 506 | int mtype; |
| 507 | unsigned long pfn; |
| 508 | unsigned long start_pfn = zone->zone_start_pfn; |
| 509 | unsigned long end_pfn = start_pfn + zone->spanned_pages; |
| 510 | unsigned long count[MIGRATE_TYPES] = { 0, }; |
| 511 | |
| 512 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { |
| 513 | struct page *page; |
| 514 | |
| 515 | if (!pfn_valid(pfn)) |
| 516 | continue; |
| 517 | |
| 518 | page = pfn_to_page(pfn); |
Mel Gorman | e80d6a2 | 2008-08-14 11:10:14 +0100 | [diff] [blame] | 519 | #ifdef CONFIG_ARCH_FLATMEM_HAS_HOLES |
| 520 | /* |
| 521 | * Ordinarily, memory holes in flatmem still have a valid |
| 522 | * memmap for the PFN range. However, an architecture for |
| 523 | * embedded systems (e.g. ARM) can free up the memmap backing |
| 524 | * holes to save memory on the assumption the memmap is |
| 525 | * never used. The page_zone linkages are then broken even |
| 526 | * though pfn_valid() returns true. Skip the page if the |
| 527 | * linkages are broken. Even if this test passed, the impact |
| 528 | * is that the counters for the movable type are off but |
| 529 | * fragmentation monitoring is likely meaningless on small |
| 530 | * systems. |
| 531 | */ |
| 532 | if (page_zone(page) != zone) |
| 533 | continue; |
| 534 | #endif |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 535 | mtype = get_pageblock_migratetype(page); |
| 536 | |
Mel Gorman | e80d6a2 | 2008-08-14 11:10:14 +0100 | [diff] [blame] | 537 | if (mtype < MIGRATE_TYPES) |
| 538 | count[mtype]++; |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 539 | } |
| 540 | |
| 541 | /* Print counts */ |
| 542 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); |
| 543 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) |
| 544 | seq_printf(m, "%12lu ", count[mtype]); |
| 545 | seq_putc(m, '\n'); |
| 546 | } |
| 547 | |
| 548 | /* Print out the free pages at each order for each migratetype */ |
| 549 | static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg) |
| 550 | { |
| 551 | int mtype; |
| 552 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 553 | |
| 554 | seq_printf(m, "\n%-23s", "Number of blocks type "); |
| 555 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) |
| 556 | seq_printf(m, "%12s ", migratetype_names[mtype]); |
| 557 | seq_putc(m, '\n'); |
| 558 | walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print); |
| 559 | |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | /* |
| 564 | * This prints out statistics in relation to grouping pages by mobility. |
| 565 | * It is expensive to collect so do not constantly read the file. |
| 566 | */ |
| 567 | static int pagetypeinfo_show(struct seq_file *m, void *arg) |
| 568 | { |
| 569 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 570 | |
KOSAKI Motohiro | 41b25a3 | 2008-04-30 00:52:13 -0700 | [diff] [blame] | 571 | /* check memoryless node */ |
| 572 | if (!node_state(pgdat->node_id, N_HIGH_MEMORY)) |
| 573 | return 0; |
| 574 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 575 | seq_printf(m, "Page block order: %d\n", pageblock_order); |
| 576 | seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages); |
| 577 | seq_putc(m, '\n'); |
| 578 | pagetypeinfo_showfree(m, pgdat); |
| 579 | pagetypeinfo_showblockcount(m, pgdat); |
| 580 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 581 | return 0; |
| 582 | } |
| 583 | |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 584 | const struct seq_operations fragmentation_op = { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 585 | .start = frag_start, |
| 586 | .next = frag_next, |
| 587 | .stop = frag_stop, |
| 588 | .show = frag_show, |
| 589 | }; |
| 590 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 591 | const struct seq_operations pagetypeinfo_op = { |
| 592 | .start = frag_start, |
| 593 | .next = frag_next, |
| 594 | .stop = frag_stop, |
| 595 | .show = pagetypeinfo_show, |
| 596 | }; |
| 597 | |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 598 | #ifdef CONFIG_ZONE_DMA |
| 599 | #define TEXT_FOR_DMA(xx) xx "_dma", |
| 600 | #else |
| 601 | #define TEXT_FOR_DMA(xx) |
| 602 | #endif |
| 603 | |
Christoph Lameter | 27bf71c | 2006-09-25 23:31:15 -0700 | [diff] [blame] | 604 | #ifdef CONFIG_ZONE_DMA32 |
| 605 | #define TEXT_FOR_DMA32(xx) xx "_dma32", |
| 606 | #else |
| 607 | #define TEXT_FOR_DMA32(xx) |
| 608 | #endif |
| 609 | |
| 610 | #ifdef CONFIG_HIGHMEM |
| 611 | #define TEXT_FOR_HIGHMEM(xx) xx "_high", |
| 612 | #else |
| 613 | #define TEXT_FOR_HIGHMEM(xx) |
| 614 | #endif |
| 615 | |
Christoph Lameter | 4b51d66 | 2007-02-10 01:43:10 -0800 | [diff] [blame] | 616 | #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] | 617 | TEXT_FOR_HIGHMEM(xx) xx "_movable", |
Christoph Lameter | 27bf71c | 2006-09-25 23:31:15 -0700 | [diff] [blame] | 618 | |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 619 | static const char * const vmstat_text[] = { |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 620 | /* Zoned VM counters */ |
Christoph Lameter | d23ad42 | 2007-02-10 01:43:02 -0800 | [diff] [blame] | 621 | "nr_free_pages", |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 622 | "nr_inactive_anon", |
| 623 | "nr_active_anon", |
| 624 | "nr_inactive_file", |
| 625 | "nr_active_file", |
Lee Schermerhorn | 7b85412 | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 626 | #ifdef CONFIG_UNEVICTABLE_LRU |
| 627 | "nr_unevictable", |
| 628 | #endif |
Christoph Lameter | f3dbd34 | 2006-06-30 01:55:36 -0700 | [diff] [blame] | 629 | "nr_anon_pages", |
Christoph Lameter | 65ba55f | 2006-06-30 01:55:34 -0700 | [diff] [blame] | 630 | "nr_mapped", |
Christoph Lameter | 347ce43 | 2006-06-30 01:55:35 -0700 | [diff] [blame] | 631 | "nr_file_pages", |
Christoph Lameter | 51ed449 | 2007-02-10 01:43:02 -0800 | [diff] [blame] | 632 | "nr_dirty", |
| 633 | "nr_writeback", |
Christoph Lameter | 972d1a7 | 2006-09-25 23:31:51 -0700 | [diff] [blame] | 634 | "nr_slab_reclaimable", |
| 635 | "nr_slab_unreclaimable", |
Christoph Lameter | df849a1 | 2006-06-30 01:55:38 -0700 | [diff] [blame] | 636 | "nr_page_table_pages", |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 637 | "nr_unstable", |
Christoph Lameter | d2c5e30 | 2006-06-30 01:55:41 -0700 | [diff] [blame] | 638 | "nr_bounce", |
Andrew Morton | e129b5c | 2006-09-27 01:50:00 -0700 | [diff] [blame] | 639 | "nr_vmscan_write", |
Miklos Szeredi | fc3ba69 | 2008-04-30 00:54:38 -0700 | [diff] [blame] | 640 | "nr_writeback_temp", |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 641 | |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 642 | #ifdef CONFIG_NUMA |
| 643 | "numa_hit", |
| 644 | "numa_miss", |
| 645 | "numa_foreign", |
| 646 | "numa_interleave", |
| 647 | "numa_local", |
| 648 | "numa_other", |
| 649 | #endif |
| 650 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 651 | #ifdef CONFIG_VM_EVENT_COUNTERS |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 652 | "pgpgin", |
| 653 | "pgpgout", |
| 654 | "pswpin", |
| 655 | "pswpout", |
| 656 | |
Christoph Lameter | 27bf71c | 2006-09-25 23:31:15 -0700 | [diff] [blame] | 657 | TEXTS_FOR_ZONES("pgalloc") |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 658 | |
| 659 | "pgfree", |
| 660 | "pgactivate", |
| 661 | "pgdeactivate", |
| 662 | |
| 663 | "pgfault", |
| 664 | "pgmajfault", |
| 665 | |
Christoph Lameter | 27bf71c | 2006-09-25 23:31:15 -0700 | [diff] [blame] | 666 | TEXTS_FOR_ZONES("pgrefill") |
| 667 | TEXTS_FOR_ZONES("pgsteal") |
| 668 | TEXTS_FOR_ZONES("pgscan_kswapd") |
| 669 | TEXTS_FOR_ZONES("pgscan_direct") |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 670 | |
| 671 | "pginodesteal", |
| 672 | "slabs_scanned", |
| 673 | "kswapd_steal", |
| 674 | "kswapd_inodesteal", |
| 675 | "pageoutrun", |
| 676 | "allocstall", |
| 677 | |
| 678 | "pgrotated", |
Adam Litke | 3b11630 | 2008-04-28 02:13:06 -0700 | [diff] [blame] | 679 | #ifdef CONFIG_HUGETLB_PAGE |
| 680 | "htlb_buddy_alloc_success", |
| 681 | "htlb_buddy_alloc_fail", |
| 682 | #endif |
Lee Schermerhorn | bbfd28e | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 683 | #ifdef CONFIG_UNEVICTABLE_LRU |
| 684 | "unevictable_pgs_culled", |
| 685 | "unevictable_pgs_scanned", |
| 686 | "unevictable_pgs_rescued", |
| 687 | #endif |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 688 | #endif |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 689 | }; |
| 690 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 691 | static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, |
| 692 | struct zone *zone) |
| 693 | { |
| 694 | int i; |
| 695 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); |
| 696 | seq_printf(m, |
| 697 | "\n pages free %lu" |
| 698 | "\n min %lu" |
| 699 | "\n low %lu" |
| 700 | "\n high %lu" |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 701 | "\n scanned %lu (aa: %lu ia: %lu af: %lu if: %lu)" |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 702 | "\n spanned %lu" |
| 703 | "\n present %lu", |
| 704 | zone_page_state(zone, NR_FREE_PAGES), |
| 705 | zone->pages_min, |
| 706 | zone->pages_low, |
| 707 | zone->pages_high, |
| 708 | zone->pages_scanned, |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 709 | zone->lru[LRU_ACTIVE_ANON].nr_scan, |
| 710 | zone->lru[LRU_INACTIVE_ANON].nr_scan, |
| 711 | zone->lru[LRU_ACTIVE_FILE].nr_scan, |
| 712 | zone->lru[LRU_INACTIVE_FILE].nr_scan, |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 713 | zone->spanned_pages, |
| 714 | zone->present_pages); |
| 715 | |
| 716 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 717 | seq_printf(m, "\n %-12s %lu", vmstat_text[i], |
| 718 | zone_page_state(zone, i)); |
| 719 | |
| 720 | seq_printf(m, |
| 721 | "\n protection: (%lu", |
| 722 | zone->lowmem_reserve[0]); |
| 723 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) |
| 724 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); |
| 725 | seq_printf(m, |
| 726 | ")" |
| 727 | "\n pagesets"); |
| 728 | for_each_online_cpu(i) { |
| 729 | struct per_cpu_pageset *pageset; |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 730 | |
| 731 | pageset = zone_pcp(zone, i); |
Christoph Lameter | 3dfa572 | 2008-02-04 22:29:19 -0800 | [diff] [blame] | 732 | seq_printf(m, |
| 733 | "\n cpu: %i" |
| 734 | "\n count: %i" |
| 735 | "\n high: %i" |
| 736 | "\n batch: %i", |
| 737 | i, |
| 738 | pageset->pcp.count, |
| 739 | pageset->pcp.high, |
| 740 | pageset->pcp.batch); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 741 | #ifdef CONFIG_SMP |
| 742 | seq_printf(m, "\n vm stats threshold: %d", |
| 743 | pageset->stat_threshold); |
| 744 | #endif |
| 745 | } |
| 746 | seq_printf(m, |
| 747 | "\n all_unreclaimable: %u" |
| 748 | "\n prev_priority: %i" |
Rik van Riel | 556adec | 2008-10-18 20:26:34 -0700 | [diff] [blame] | 749 | "\n start_pfn: %lu" |
| 750 | "\n inactive_ratio: %u", |
David Rientjes | e815af9 | 2007-10-16 23:25:54 -0700 | [diff] [blame] | 751 | zone_is_all_unreclaimable(zone), |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 752 | zone->prev_priority, |
Rik van Riel | 556adec | 2008-10-18 20:26:34 -0700 | [diff] [blame] | 753 | zone->zone_start_pfn, |
| 754 | zone->inactive_ratio); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 755 | seq_putc(m, '\n'); |
| 756 | } |
| 757 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 758 | /* |
| 759 | * Output information about zones in @pgdat. |
| 760 | */ |
| 761 | static int zoneinfo_show(struct seq_file *m, void *arg) |
| 762 | { |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 763 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 764 | walk_zones_in_node(m, pgdat, zoneinfo_show_print); |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 765 | return 0; |
| 766 | } |
| 767 | |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 768 | const struct seq_operations zoneinfo_op = { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 769 | .start = frag_start, /* iterate over all zones. The same as in |
| 770 | * fragmentation. */ |
| 771 | .next = frag_next, |
| 772 | .stop = frag_stop, |
| 773 | .show = zoneinfo_show, |
| 774 | }; |
| 775 | |
| 776 | static void *vmstat_start(struct seq_file *m, loff_t *pos) |
| 777 | { |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 778 | unsigned long *v; |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 779 | #ifdef CONFIG_VM_EVENT_COUNTERS |
| 780 | unsigned long *e; |
| 781 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 782 | int i; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 783 | |
| 784 | if (*pos >= ARRAY_SIZE(vmstat_text)) |
| 785 | return NULL; |
| 786 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 787 | #ifdef CONFIG_VM_EVENT_COUNTERS |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 788 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 789 | + sizeof(struct vm_event_state), GFP_KERNEL); |
| 790 | #else |
| 791 | v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long), |
| 792 | GFP_KERNEL); |
| 793 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 794 | m->private = v; |
| 795 | if (!v) |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 796 | return ERR_PTR(-ENOMEM); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 797 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 798 | v[i] = global_page_state(i); |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 799 | #ifdef CONFIG_VM_EVENT_COUNTERS |
| 800 | e = v + NR_VM_ZONE_STAT_ITEMS; |
| 801 | all_vm_events(e); |
| 802 | e[PGPGIN] /= 2; /* sectors -> kbytes */ |
| 803 | e[PGPGOUT] /= 2; |
| 804 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 805 | return v + *pos; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 806 | } |
| 807 | |
| 808 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) |
| 809 | { |
| 810 | (*pos)++; |
| 811 | if (*pos >= ARRAY_SIZE(vmstat_text)) |
| 812 | return NULL; |
| 813 | return (unsigned long *)m->private + *pos; |
| 814 | } |
| 815 | |
| 816 | static int vmstat_show(struct seq_file *m, void *arg) |
| 817 | { |
| 818 | unsigned long *l = arg; |
| 819 | unsigned long off = l - (unsigned long *)m->private; |
| 820 | |
| 821 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); |
| 822 | return 0; |
| 823 | } |
| 824 | |
| 825 | static void vmstat_stop(struct seq_file *m, void *arg) |
| 826 | { |
| 827 | kfree(m->private); |
| 828 | m->private = NULL; |
| 829 | } |
| 830 | |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 831 | const struct seq_operations vmstat_op = { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 832 | .start = vmstat_start, |
| 833 | .next = vmstat_next, |
| 834 | .stop = vmstat_stop, |
| 835 | .show = vmstat_show, |
| 836 | }; |
| 837 | |
| 838 | #endif /* CONFIG_PROC_FS */ |
| 839 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 840 | #ifdef CONFIG_SMP |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 841 | static DEFINE_PER_CPU(struct delayed_work, vmstat_work); |
Christoph Lameter | 77461ab | 2007-05-09 02:35:13 -0700 | [diff] [blame] | 842 | int sysctl_stat_interval __read_mostly = HZ; |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 843 | |
| 844 | static void vmstat_update(struct work_struct *w) |
| 845 | { |
| 846 | refresh_cpu_vm_stats(smp_processor_id()); |
Christoph Lameter | 77461ab | 2007-05-09 02:35:13 -0700 | [diff] [blame] | 847 | schedule_delayed_work(&__get_cpu_var(vmstat_work), |
| 848 | sysctl_stat_interval); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 849 | } |
| 850 | |
Randy Dunlap | 42614fc | 2007-11-14 17:00:12 -0800 | [diff] [blame] | 851 | static void __cpuinit start_cpu_timer(int cpu) |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 852 | { |
| 853 | struct delayed_work *vmstat_work = &per_cpu(vmstat_work, cpu); |
| 854 | |
Christoph Lameter | 39bf627 | 2007-05-10 22:22:21 -0700 | [diff] [blame] | 855 | INIT_DELAYED_WORK_DEFERRABLE(vmstat_work, vmstat_update); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 856 | schedule_delayed_work_on(cpu, vmstat_work, HZ + cpu); |
| 857 | } |
| 858 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 859 | /* |
| 860 | * Use the cpu notifier to insure that the thresholds are recalculated |
| 861 | * when necessary. |
| 862 | */ |
| 863 | static int __cpuinit vmstat_cpuup_callback(struct notifier_block *nfb, |
| 864 | unsigned long action, |
| 865 | void *hcpu) |
| 866 | { |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 867 | long cpu = (long)hcpu; |
| 868 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 869 | switch (action) { |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 870 | case CPU_ONLINE: |
| 871 | case CPU_ONLINE_FROZEN: |
| 872 | start_cpu_timer(cpu); |
| 873 | break; |
| 874 | case CPU_DOWN_PREPARE: |
| 875 | case CPU_DOWN_PREPARE_FROZEN: |
| 876 | cancel_rearming_delayed_work(&per_cpu(vmstat_work, cpu)); |
| 877 | per_cpu(vmstat_work, cpu).work.func = NULL; |
| 878 | break; |
| 879 | case CPU_DOWN_FAILED: |
| 880 | case CPU_DOWN_FAILED_FROZEN: |
| 881 | start_cpu_timer(cpu); |
| 882 | break; |
Andy Whitcroft | ce421c7 | 2006-12-06 20:33:08 -0800 | [diff] [blame] | 883 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 884 | case CPU_DEAD_FROZEN: |
Andy Whitcroft | ce421c7 | 2006-12-06 20:33:08 -0800 | [diff] [blame] | 885 | refresh_zone_stat_thresholds(); |
| 886 | break; |
| 887 | default: |
| 888 | break; |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 889 | } |
| 890 | return NOTIFY_OK; |
| 891 | } |
| 892 | |
| 893 | static struct notifier_block __cpuinitdata vmstat_notifier = |
| 894 | { &vmstat_cpuup_callback, NULL, 0 }; |
| 895 | |
Adrian Bunk | e2fc88d | 2007-10-16 01:26:27 -0700 | [diff] [blame] | 896 | static int __init setup_vmstat(void) |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 897 | { |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 898 | int cpu; |
| 899 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 900 | refresh_zone_stat_thresholds(); |
| 901 | register_cpu_notifier(&vmstat_notifier); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 902 | |
| 903 | for_each_online_cpu(cpu) |
| 904 | start_cpu_timer(cpu); |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 905 | return 0; |
| 906 | } |
| 907 | module_init(setup_vmstat) |
| 908 | #endif |