Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/mm/vmstat.c |
| 3 | * |
| 4 | * Manages VM statistics |
| 5 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 6 | * |
| 7 | * zoned VM statistics |
| 8 | * Copyright (C) 2006 Silicon Graphics, Inc., |
| 9 | * Christoph Lameter <christoph@lameter.com> |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 10 | */ |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 11 | #include <linux/fs.h> |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 12 | #include <linux/mm.h> |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 13 | #include <linux/err.h> |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 14 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 15 | #include <linux/slab.h> |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 16 | #include <linux/cpu.h> |
Adrian Bunk | c748e13 | 2008-07-23 21:27:03 -0700 | [diff] [blame] | 17 | #include <linux/vmstat.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 18 | #include <linux/sched.h> |
Mel Gorman | f1a5ab1 | 2010-05-24 14:32:26 -0700 | [diff] [blame] | 19 | #include <linux/math64.h> |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 20 | #include <linux/writeback.h> |
Namhyung Kim | 36deb0b | 2010-10-26 14:22:04 -0700 | [diff] [blame] | 21 | #include <linux/compaction.h> |
Lisa Du | 6e543d5 | 2013-09-11 14:22:36 -0700 | [diff] [blame] | 22 | #include <linux/mm_inline.h> |
| 23 | |
| 24 | #include "internal.h" |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 25 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 26 | #ifdef CONFIG_VM_EVENT_COUNTERS |
| 27 | DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}}; |
| 28 | EXPORT_PER_CPU_SYMBOL(vm_event_states); |
| 29 | |
Minchan Kim | 31f961a | 2010-08-09 17:18:59 -0700 | [diff] [blame] | 30 | static void sum_vm_events(unsigned long *ret) |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 31 | { |
Christoph Lameter | 9eccf2a | 2008-02-04 22:29:22 -0800 | [diff] [blame] | 32 | int cpu; |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 33 | int i; |
| 34 | |
| 35 | memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long)); |
| 36 | |
Minchan Kim | 31f961a | 2010-08-09 17:18:59 -0700 | [diff] [blame] | 37 | for_each_online_cpu(cpu) { |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 38 | struct vm_event_state *this = &per_cpu(vm_event_states, cpu); |
| 39 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 40 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) |
| 41 | ret[i] += this->event[i]; |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | /* |
| 46 | * Accumulate the vm event counters across all CPUs. |
| 47 | * The result is unavoidably approximate - it can change |
| 48 | * during and after execution of this function. |
| 49 | */ |
| 50 | void all_vm_events(unsigned long *ret) |
| 51 | { |
KOSAKI Motohiro | b5be113 | 2008-05-12 14:02:06 -0700 | [diff] [blame] | 52 | get_online_cpus(); |
Minchan Kim | 31f961a | 2010-08-09 17:18:59 -0700 | [diff] [blame] | 53 | sum_vm_events(ret); |
KOSAKI Motohiro | b5be113 | 2008-05-12 14:02:06 -0700 | [diff] [blame] | 54 | put_online_cpus(); |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 55 | } |
Heiko Carstens | 32dd66f | 2006-07-10 04:44:31 -0700 | [diff] [blame] | 56 | EXPORT_SYMBOL_GPL(all_vm_events); |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 57 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 58 | /* |
| 59 | * Fold the foreign cpu events into our own. |
| 60 | * |
| 61 | * This is adding to the events on one processor |
| 62 | * but keeps the global counts constant. |
| 63 | */ |
| 64 | void vm_events_fold_cpu(int cpu) |
| 65 | { |
| 66 | struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu); |
| 67 | int i; |
| 68 | |
| 69 | for (i = 0; i < NR_VM_EVENT_ITEMS; i++) { |
| 70 | count_vm_events(i, fold_state->event[i]); |
| 71 | fold_state->event[i] = 0; |
| 72 | } |
| 73 | } |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 74 | |
| 75 | #endif /* CONFIG_VM_EVENT_COUNTERS */ |
| 76 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 77 | /* |
| 78 | * Manage combined zone based / global counters |
| 79 | * |
| 80 | * vm_stat contains the global counters |
| 81 | */ |
Dimitri Sivanich | a1cb2c6 | 2011-10-31 17:09:46 -0700 | [diff] [blame] | 82 | atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS] __cacheline_aligned_in_smp; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 83 | EXPORT_SYMBOL(vm_stat); |
| 84 | |
| 85 | #ifdef CONFIG_SMP |
| 86 | |
Mel Gorman | b44129b | 2011-01-13 15:45:43 -0800 | [diff] [blame] | 87 | int calculate_pressure_threshold(struct zone *zone) |
Mel Gorman | 88f5acf | 2011-01-13 15:45:41 -0800 | [diff] [blame] | 88 | { |
| 89 | int threshold; |
| 90 | int watermark_distance; |
| 91 | |
| 92 | /* |
| 93 | * As vmstats are not up to date, there is drift between the estimated |
| 94 | * and real values. For high thresholds and a high number of CPUs, it |
| 95 | * is possible for the min watermark to be breached while the estimated |
| 96 | * value looks fine. The pressure threshold is a reduced value such |
| 97 | * that even the maximum amount of drift will not accidentally breach |
| 98 | * the min watermark |
| 99 | */ |
| 100 | watermark_distance = low_wmark_pages(zone) - min_wmark_pages(zone); |
| 101 | threshold = max(1, (int)(watermark_distance / num_online_cpus())); |
| 102 | |
| 103 | /* |
| 104 | * Maximum threshold is 125 |
| 105 | */ |
| 106 | threshold = min(125, threshold); |
| 107 | |
| 108 | return threshold; |
| 109 | } |
| 110 | |
Mel Gorman | b44129b | 2011-01-13 15:45:43 -0800 | [diff] [blame] | 111 | int calculate_normal_threshold(struct zone *zone) |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 112 | { |
| 113 | int threshold; |
| 114 | int mem; /* memory in 128 MB units */ |
| 115 | |
| 116 | /* |
| 117 | * The threshold scales with the number of processors and the amount |
| 118 | * of memory per zone. More memory means that we can defer updates for |
| 119 | * longer, more processors could lead to more contention. |
| 120 | * fls() is used to have a cheap way of logarithmic scaling. |
| 121 | * |
| 122 | * Some sample thresholds: |
| 123 | * |
| 124 | * Threshold Processors (fls) Zonesize fls(mem+1) |
| 125 | * ------------------------------------------------------------------ |
| 126 | * 8 1 1 0.9-1 GB 4 |
| 127 | * 16 2 2 0.9-1 GB 4 |
| 128 | * 20 2 2 1-2 GB 5 |
| 129 | * 24 2 2 2-4 GB 6 |
| 130 | * 28 2 2 4-8 GB 7 |
| 131 | * 32 2 2 8-16 GB 8 |
| 132 | * 4 2 2 <128M 1 |
| 133 | * 30 4 3 2-4 GB 5 |
| 134 | * 48 4 3 8-16 GB 8 |
| 135 | * 32 8 4 1-2 GB 4 |
| 136 | * 32 8 4 0.9-1GB 4 |
| 137 | * 10 16 5 <128M 1 |
| 138 | * 40 16 5 900M 4 |
| 139 | * 70 64 7 2-4 GB 5 |
| 140 | * 84 64 7 4-8 GB 6 |
| 141 | * 108 512 9 4-8 GB 6 |
| 142 | * 125 1024 10 8-16 GB 8 |
| 143 | * 125 1024 10 16-32 GB 9 |
| 144 | */ |
| 145 | |
Jiang Liu | b40da04 | 2013-02-22 16:33:52 -0800 | [diff] [blame] | 146 | mem = zone->managed_pages >> (27 - PAGE_SHIFT); |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 147 | |
| 148 | threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem)); |
| 149 | |
| 150 | /* |
| 151 | * Maximum threshold is 125 |
| 152 | */ |
| 153 | threshold = min(125, threshold); |
| 154 | |
| 155 | return threshold; |
| 156 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 157 | |
| 158 | /* |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 159 | * Refresh the thresholds for each zone. |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 160 | */ |
KOSAKI Motohiro | a6cccdc | 2011-05-24 17:11:33 -0700 | [diff] [blame] | 161 | void refresh_zone_stat_thresholds(void) |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 162 | { |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 163 | struct zone *zone; |
| 164 | int cpu; |
| 165 | int threshold; |
| 166 | |
KOSAKI Motohiro | ee99c71 | 2009-03-31 15:19:31 -0700 | [diff] [blame] | 167 | for_each_populated_zone(zone) { |
Christoph Lameter | aa45484 | 2010-09-09 16:38:17 -0700 | [diff] [blame] | 168 | unsigned long max_drift, tolerate_drift; |
| 169 | |
Mel Gorman | b44129b | 2011-01-13 15:45:43 -0800 | [diff] [blame] | 170 | threshold = calculate_normal_threshold(zone); |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 171 | |
| 172 | for_each_online_cpu(cpu) |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 173 | per_cpu_ptr(zone->pageset, cpu)->stat_threshold |
| 174 | = threshold; |
Christoph Lameter | aa45484 | 2010-09-09 16:38:17 -0700 | [diff] [blame] | 175 | |
| 176 | /* |
| 177 | * Only set percpu_drift_mark if there is a danger that |
| 178 | * NR_FREE_PAGES reports the low watermark is ok when in fact |
| 179 | * the min watermark could be breached by an allocation |
| 180 | */ |
| 181 | tolerate_drift = low_wmark_pages(zone) - min_wmark_pages(zone); |
| 182 | max_drift = num_online_cpus() * threshold; |
| 183 | if (max_drift > tolerate_drift) |
| 184 | zone->percpu_drift_mark = high_wmark_pages(zone) + |
| 185 | max_drift; |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 186 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 187 | } |
| 188 | |
Mel Gorman | b44129b | 2011-01-13 15:45:43 -0800 | [diff] [blame] | 189 | void set_pgdat_percpu_threshold(pg_data_t *pgdat, |
| 190 | int (*calculate_pressure)(struct zone *)) |
Mel Gorman | 88f5acf | 2011-01-13 15:45:41 -0800 | [diff] [blame] | 191 | { |
| 192 | struct zone *zone; |
| 193 | int cpu; |
| 194 | int threshold; |
| 195 | int i; |
| 196 | |
Mel Gorman | 88f5acf | 2011-01-13 15:45:41 -0800 | [diff] [blame] | 197 | for (i = 0; i < pgdat->nr_zones; i++) { |
| 198 | zone = &pgdat->node_zones[i]; |
| 199 | if (!zone->percpu_drift_mark) |
| 200 | continue; |
| 201 | |
Mel Gorman | b44129b | 2011-01-13 15:45:43 -0800 | [diff] [blame] | 202 | threshold = (*calculate_pressure)(zone); |
| 203 | for_each_possible_cpu(cpu) |
Mel Gorman | 88f5acf | 2011-01-13 15:45:41 -0800 | [diff] [blame] | 204 | per_cpu_ptr(zone->pageset, cpu)->stat_threshold |
| 205 | = threshold; |
| 206 | } |
Mel Gorman | 88f5acf | 2011-01-13 15:45:41 -0800 | [diff] [blame] | 207 | } |
| 208 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 209 | /* |
| 210 | * For use when we know that interrupts are disabled. |
| 211 | */ |
| 212 | void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item, |
| 213 | int delta) |
| 214 | { |
Christoph Lameter | 12938a9 | 2010-12-06 11:16:20 -0600 | [diff] [blame] | 215 | struct per_cpu_pageset __percpu *pcp = zone->pageset; |
| 216 | s8 __percpu *p = pcp->vm_stat_diff + item; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 217 | long x; |
Christoph Lameter | 12938a9 | 2010-12-06 11:16:20 -0600 | [diff] [blame] | 218 | long t; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 219 | |
Christoph Lameter | 12938a9 | 2010-12-06 11:16:20 -0600 | [diff] [blame] | 220 | x = delta + __this_cpu_read(*p); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 221 | |
Christoph Lameter | 12938a9 | 2010-12-06 11:16:20 -0600 | [diff] [blame] | 222 | t = __this_cpu_read(pcp->stat_threshold); |
| 223 | |
| 224 | if (unlikely(x > t || x < -t)) { |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 225 | zone_page_state_add(x, zone, item); |
| 226 | x = 0; |
| 227 | } |
Christoph Lameter | 12938a9 | 2010-12-06 11:16:20 -0600 | [diff] [blame] | 228 | __this_cpu_write(*p, x); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 229 | } |
| 230 | EXPORT_SYMBOL(__mod_zone_page_state); |
| 231 | |
| 232 | /* |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 233 | * Optimized increment and decrement functions. |
| 234 | * |
| 235 | * These are only for a single page and therefore can take a struct page * |
| 236 | * argument instead of struct zone *. This allows the inclusion of the code |
| 237 | * generated for page_zone(page) into the optimized functions. |
| 238 | * |
| 239 | * No overflow check is necessary and therefore the differential can be |
| 240 | * incremented or decremented in place which may allow the compilers to |
| 241 | * generate better code. |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 242 | * The increment or decrement is known and therefore one boundary check can |
| 243 | * be omitted. |
| 244 | * |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 245 | * NOTE: These functions are very performance sensitive. Change only |
| 246 | * with care. |
| 247 | * |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 248 | * Some processors have inc/dec instructions that are atomic vs an interrupt. |
| 249 | * However, the code must first determine the differential location in a zone |
| 250 | * based on the processor number and then inc/dec the counter. There is no |
| 251 | * guarantee without disabling preemption that the processor will not change |
| 252 | * in between and therefore the atomicity vs. interrupt cannot be exploited |
| 253 | * in a useful way here. |
| 254 | */ |
Christoph Lameter | c878538 | 2007-02-10 01:43:01 -0800 | [diff] [blame] | 255 | void __inc_zone_state(struct zone *zone, enum zone_stat_item item) |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 256 | { |
Christoph Lameter | 12938a9 | 2010-12-06 11:16:20 -0600 | [diff] [blame] | 257 | struct per_cpu_pageset __percpu *pcp = zone->pageset; |
| 258 | s8 __percpu *p = pcp->vm_stat_diff + item; |
| 259 | s8 v, t; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 260 | |
Christoph Lameter | 908ee0f | 2010-12-06 11:40:02 -0600 | [diff] [blame] | 261 | v = __this_cpu_inc_return(*p); |
Christoph Lameter | 12938a9 | 2010-12-06 11:16:20 -0600 | [diff] [blame] | 262 | t = __this_cpu_read(pcp->stat_threshold); |
| 263 | if (unlikely(v > t)) { |
| 264 | s8 overstep = t >> 1; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 265 | |
Christoph Lameter | 12938a9 | 2010-12-06 11:16:20 -0600 | [diff] [blame] | 266 | zone_page_state_add(v + overstep, zone, item); |
| 267 | __this_cpu_write(*p, -overstep); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 268 | } |
| 269 | } |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 270 | |
| 271 | void __inc_zone_page_state(struct page *page, enum zone_stat_item item) |
| 272 | { |
| 273 | __inc_zone_state(page_zone(page), item); |
| 274 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 275 | EXPORT_SYMBOL(__inc_zone_page_state); |
| 276 | |
Christoph Lameter | c878538 | 2007-02-10 01:43:01 -0800 | [diff] [blame] | 277 | void __dec_zone_state(struct zone *zone, enum zone_stat_item item) |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 278 | { |
Christoph Lameter | 12938a9 | 2010-12-06 11:16:20 -0600 | [diff] [blame] | 279 | struct per_cpu_pageset __percpu *pcp = zone->pageset; |
| 280 | s8 __percpu *p = pcp->vm_stat_diff + item; |
| 281 | s8 v, t; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 282 | |
Christoph Lameter | 908ee0f | 2010-12-06 11:40:02 -0600 | [diff] [blame] | 283 | v = __this_cpu_dec_return(*p); |
Christoph Lameter | 12938a9 | 2010-12-06 11:16:20 -0600 | [diff] [blame] | 284 | t = __this_cpu_read(pcp->stat_threshold); |
| 285 | if (unlikely(v < - t)) { |
| 286 | s8 overstep = t >> 1; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 287 | |
Christoph Lameter | 12938a9 | 2010-12-06 11:16:20 -0600 | [diff] [blame] | 288 | zone_page_state_add(v - overstep, zone, item); |
| 289 | __this_cpu_write(*p, overstep); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 290 | } |
| 291 | } |
Christoph Lameter | c878538 | 2007-02-10 01:43:01 -0800 | [diff] [blame] | 292 | |
| 293 | void __dec_zone_page_state(struct page *page, enum zone_stat_item item) |
| 294 | { |
| 295 | __dec_zone_state(page_zone(page), item); |
| 296 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 297 | EXPORT_SYMBOL(__dec_zone_page_state); |
| 298 | |
Heiko Carstens | 4156153 | 2012-01-12 17:17:30 -0800 | [diff] [blame] | 299 | #ifdef CONFIG_HAVE_CMPXCHG_LOCAL |
Christoph Lameter | 7c83912 | 2010-12-14 10:28:46 -0600 | [diff] [blame] | 300 | /* |
| 301 | * If we have cmpxchg_local support then we do not need to incur the overhead |
| 302 | * that comes with local_irq_save/restore if we use this_cpu_cmpxchg. |
| 303 | * |
| 304 | * mod_state() modifies the zone counter state through atomic per cpu |
| 305 | * operations. |
| 306 | * |
| 307 | * Overstep mode specifies how overstep should handled: |
| 308 | * 0 No overstepping |
| 309 | * 1 Overstepping half of threshold |
| 310 | * -1 Overstepping minus half of threshold |
| 311 | */ |
| 312 | static inline void mod_state(struct zone *zone, |
| 313 | enum zone_stat_item item, int delta, int overstep_mode) |
| 314 | { |
| 315 | struct per_cpu_pageset __percpu *pcp = zone->pageset; |
| 316 | s8 __percpu *p = pcp->vm_stat_diff + item; |
| 317 | long o, n, t, z; |
| 318 | |
| 319 | do { |
| 320 | z = 0; /* overflow to zone counters */ |
| 321 | |
| 322 | /* |
| 323 | * The fetching of the stat_threshold is racy. We may apply |
| 324 | * a counter threshold to the wrong the cpu if we get |
Christoph Lameter | d3bc236 | 2011-04-14 15:21:58 -0700 | [diff] [blame] | 325 | * rescheduled while executing here. However, the next |
| 326 | * counter update will apply the threshold again and |
| 327 | * therefore bring the counter under the threshold again. |
| 328 | * |
| 329 | * Most of the time the thresholds are the same anyways |
| 330 | * for all cpus in a zone. |
Christoph Lameter | 7c83912 | 2010-12-14 10:28:46 -0600 | [diff] [blame] | 331 | */ |
| 332 | t = this_cpu_read(pcp->stat_threshold); |
| 333 | |
| 334 | o = this_cpu_read(*p); |
| 335 | n = delta + o; |
| 336 | |
| 337 | if (n > t || n < -t) { |
| 338 | int os = overstep_mode * (t >> 1) ; |
| 339 | |
| 340 | /* Overflow must be added to zone counters */ |
| 341 | z = n + os; |
| 342 | n = -os; |
| 343 | } |
| 344 | } while (this_cpu_cmpxchg(*p, o, n) != o); |
| 345 | |
| 346 | if (z) |
| 347 | zone_page_state_add(z, zone, item); |
| 348 | } |
| 349 | |
| 350 | void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, |
| 351 | int delta) |
| 352 | { |
| 353 | mod_state(zone, item, delta, 0); |
| 354 | } |
| 355 | EXPORT_SYMBOL(mod_zone_page_state); |
| 356 | |
| 357 | void inc_zone_state(struct zone *zone, enum zone_stat_item item) |
| 358 | { |
| 359 | mod_state(zone, item, 1, 1); |
| 360 | } |
| 361 | |
| 362 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
| 363 | { |
| 364 | mod_state(page_zone(page), item, 1, 1); |
| 365 | } |
| 366 | EXPORT_SYMBOL(inc_zone_page_state); |
| 367 | |
| 368 | void dec_zone_page_state(struct page *page, enum zone_stat_item item) |
| 369 | { |
| 370 | mod_state(page_zone(page), item, -1, -1); |
| 371 | } |
| 372 | EXPORT_SYMBOL(dec_zone_page_state); |
| 373 | #else |
| 374 | /* |
| 375 | * Use interrupt disable to serialize counter updates |
| 376 | */ |
| 377 | void mod_zone_page_state(struct zone *zone, enum zone_stat_item item, |
| 378 | int delta) |
| 379 | { |
| 380 | unsigned long flags; |
| 381 | |
| 382 | local_irq_save(flags); |
| 383 | __mod_zone_page_state(zone, item, delta); |
| 384 | local_irq_restore(flags); |
| 385 | } |
| 386 | EXPORT_SYMBOL(mod_zone_page_state); |
| 387 | |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 388 | void inc_zone_state(struct zone *zone, enum zone_stat_item item) |
| 389 | { |
| 390 | unsigned long flags; |
| 391 | |
| 392 | local_irq_save(flags); |
| 393 | __inc_zone_state(zone, item); |
| 394 | local_irq_restore(flags); |
| 395 | } |
| 396 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 397 | void inc_zone_page_state(struct page *page, enum zone_stat_item item) |
| 398 | { |
| 399 | unsigned long flags; |
| 400 | struct zone *zone; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 401 | |
| 402 | zone = page_zone(page); |
| 403 | local_irq_save(flags); |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 404 | __inc_zone_state(zone, item); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 405 | local_irq_restore(flags); |
| 406 | } |
| 407 | EXPORT_SYMBOL(inc_zone_page_state); |
| 408 | |
| 409 | void dec_zone_page_state(struct page *page, enum zone_stat_item item) |
| 410 | { |
| 411 | unsigned long flags; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 412 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 413 | local_irq_save(flags); |
Christoph Lameter | a302eb4 | 2006-08-31 21:27:34 -0700 | [diff] [blame] | 414 | __dec_zone_page_state(page, item); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 415 | local_irq_restore(flags); |
| 416 | } |
| 417 | EXPORT_SYMBOL(dec_zone_page_state); |
Christoph Lameter | 7c83912 | 2010-12-14 10:28:46 -0600 | [diff] [blame] | 418 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 419 | |
Christoph Lameter | 4edb074 | 2013-09-11 14:21:31 -0700 | [diff] [blame] | 420 | static inline void fold_diff(int *diff) |
| 421 | { |
| 422 | int i; |
| 423 | |
| 424 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 425 | if (diff[i]) |
| 426 | atomic_long_add(diff[i], &vm_stat[i]); |
| 427 | } |
| 428 | |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 429 | /* |
Christoph Lameter | 2bb921e | 2013-09-11 14:21:30 -0700 | [diff] [blame] | 430 | * Update the zone counters for the current cpu. |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 431 | * |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 432 | * Note that refresh_cpu_vm_stats strives to only access |
| 433 | * node local memory. The per cpu pagesets on remote zones are placed |
| 434 | * in the memory local to the processor using that pageset. So the |
| 435 | * loop over all zones will access a series of cachelines local to |
| 436 | * the processor. |
| 437 | * |
| 438 | * The call to zone_page_state_add updates the cachelines with the |
| 439 | * statistics in the remote zone struct as well as the global cachelines |
| 440 | * with the global counters. These could cause remote node cache line |
| 441 | * bouncing and will have to be only done when necessary. |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 442 | */ |
Christoph Lameter | fbc2edb | 2013-09-11 14:21:32 -0700 | [diff] [blame] | 443 | static void refresh_cpu_vm_stats(void) |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 444 | { |
| 445 | struct zone *zone; |
| 446 | int i; |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 447 | int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, }; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 448 | |
KOSAKI Motohiro | ee99c71 | 2009-03-31 15:19:31 -0700 | [diff] [blame] | 449 | for_each_populated_zone(zone) { |
Christoph Lameter | fbc2edb | 2013-09-11 14:21:32 -0700 | [diff] [blame] | 450 | struct per_cpu_pageset __percpu *p = zone->pageset; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 451 | |
Christoph Lameter | fbc2edb | 2013-09-11 14:21:32 -0700 | [diff] [blame] | 452 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) { |
| 453 | int v; |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 454 | |
Christoph Lameter | fbc2edb | 2013-09-11 14:21:32 -0700 | [diff] [blame] | 455 | v = this_cpu_xchg(p->vm_stat_diff[i], 0); |
| 456 | if (v) { |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 457 | |
Christoph Lameter | a7f75e2 | 2008-02-04 22:29:16 -0800 | [diff] [blame] | 458 | atomic_long_add(v, &zone->vm_stat[i]); |
| 459 | global_diff[i] += v; |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 460 | #ifdef CONFIG_NUMA |
| 461 | /* 3 seconds idle till flush */ |
Christoph Lameter | fbc2edb | 2013-09-11 14:21:32 -0700 | [diff] [blame] | 462 | __this_cpu_write(p->expire, 3); |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 463 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 464 | } |
Christoph Lameter | fbc2edb | 2013-09-11 14:21:32 -0700 | [diff] [blame] | 465 | } |
Dimitri Sivanich | 468fd62 | 2008-04-28 02:13:37 -0700 | [diff] [blame] | 466 | cond_resched(); |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 467 | #ifdef CONFIG_NUMA |
| 468 | /* |
| 469 | * Deal with draining the remote pageset of this |
| 470 | * processor |
| 471 | * |
| 472 | * Check if there are pages remaining in this pageset |
| 473 | * if not then there is nothing to expire. |
| 474 | */ |
Christoph Lameter | fbc2edb | 2013-09-11 14:21:32 -0700 | [diff] [blame] | 475 | if (!__this_cpu_read(p->expire) || |
| 476 | !__this_cpu_read(p->pcp.count)) |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 477 | continue; |
| 478 | |
| 479 | /* |
| 480 | * We never drain zones local to this processor. |
| 481 | */ |
| 482 | if (zone_to_nid(zone) == numa_node_id()) { |
Christoph Lameter | fbc2edb | 2013-09-11 14:21:32 -0700 | [diff] [blame] | 483 | __this_cpu_write(p->expire, 0); |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 484 | continue; |
| 485 | } |
| 486 | |
Christoph Lameter | fbc2edb | 2013-09-11 14:21:32 -0700 | [diff] [blame] | 487 | |
| 488 | if (__this_cpu_dec_return(p->expire)) |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 489 | continue; |
| 490 | |
Christoph Lameter | fbc2edb | 2013-09-11 14:21:32 -0700 | [diff] [blame] | 491 | if (__this_cpu_read(p->pcp.count)) |
| 492 | drain_zone_pages(zone, __this_cpu_ptr(&p->pcp)); |
Christoph Lameter | 4037d45 | 2007-05-09 02:35:14 -0700 | [diff] [blame] | 493 | #endif |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 494 | } |
Christoph Lameter | 4edb074 | 2013-09-11 14:21:31 -0700 | [diff] [blame] | 495 | fold_diff(global_diff); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 496 | } |
| 497 | |
Cody P Schafer | 40f4b1e | 2013-04-29 15:08:38 -0700 | [diff] [blame] | 498 | /* |
Christoph Lameter | 2bb921e | 2013-09-11 14:21:30 -0700 | [diff] [blame] | 499 | * Fold the data for an offline cpu into the global array. |
| 500 | * There cannot be any access by the offline cpu and therefore |
| 501 | * synchronization is simplified. |
| 502 | */ |
| 503 | void cpu_vm_stats_fold(int cpu) |
| 504 | { |
| 505 | struct zone *zone; |
| 506 | int i; |
| 507 | int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, }; |
| 508 | |
| 509 | for_each_populated_zone(zone) { |
| 510 | struct per_cpu_pageset *p; |
| 511 | |
| 512 | p = per_cpu_ptr(zone->pageset, cpu); |
| 513 | |
| 514 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 515 | if (p->vm_stat_diff[i]) { |
| 516 | int v; |
| 517 | |
| 518 | v = p->vm_stat_diff[i]; |
| 519 | p->vm_stat_diff[i] = 0; |
| 520 | atomic_long_add(v, &zone->vm_stat[i]); |
| 521 | global_diff[i] += v; |
| 522 | } |
| 523 | } |
| 524 | |
Christoph Lameter | 4edb074 | 2013-09-11 14:21:31 -0700 | [diff] [blame] | 525 | fold_diff(global_diff); |
Christoph Lameter | 2bb921e | 2013-09-11 14:21:30 -0700 | [diff] [blame] | 526 | } |
| 527 | |
| 528 | /* |
Cody P Schafer | 40f4b1e | 2013-04-29 15:08:38 -0700 | [diff] [blame] | 529 | * this is only called if !populated_zone(zone), which implies no other users of |
| 530 | * pset->vm_stat_diff[] exsist. |
| 531 | */ |
Minchan Kim | 5a88381 | 2012-10-08 16:33:39 -0700 | [diff] [blame] | 532 | void drain_zonestat(struct zone *zone, struct per_cpu_pageset *pset) |
| 533 | { |
| 534 | int i; |
| 535 | |
| 536 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 537 | if (pset->vm_stat_diff[i]) { |
| 538 | int v = pset->vm_stat_diff[i]; |
| 539 | pset->vm_stat_diff[i] = 0; |
| 540 | atomic_long_add(v, &zone->vm_stat[i]); |
| 541 | atomic_long_add(v, &vm_stat[i]); |
| 542 | } |
| 543 | } |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 544 | #endif |
| 545 | |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 546 | #ifdef CONFIG_NUMA |
| 547 | /* |
| 548 | * zonelist = the list of zones passed to the allocator |
| 549 | * z = the zone from which the allocation occurred. |
| 550 | * |
| 551 | * Must be called with interrupts disabled. |
Andi Kleen | 78afd56 | 2011-03-22 16:33:12 -0700 | [diff] [blame] | 552 | * |
| 553 | * When __GFP_OTHER_NODE is set assume the node of the preferred |
| 554 | * zone is the local node. This is useful for daemons who allocate |
| 555 | * memory on behalf of other processes. |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 556 | */ |
Andi Kleen | 78afd56 | 2011-03-22 16:33:12 -0700 | [diff] [blame] | 557 | void zone_statistics(struct zone *preferred_zone, struct zone *z, gfp_t flags) |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 558 | { |
Mel Gorman | 18ea7e7 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 559 | if (z->zone_pgdat == preferred_zone->zone_pgdat) { |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 560 | __inc_zone_state(z, NUMA_HIT); |
| 561 | } else { |
| 562 | __inc_zone_state(z, NUMA_MISS); |
Mel Gorman | 18ea7e7 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 563 | __inc_zone_state(preferred_zone, NUMA_FOREIGN); |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 564 | } |
Andi Kleen | 78afd56 | 2011-03-22 16:33:12 -0700 | [diff] [blame] | 565 | if (z->node == ((flags & __GFP_OTHER_NODE) ? |
| 566 | preferred_zone->node : numa_node_id())) |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 567 | __inc_zone_state(z, NUMA_LOCAL); |
| 568 | else |
| 569 | __inc_zone_state(z, NUMA_OTHER); |
| 570 | } |
| 571 | #endif |
| 572 | |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 573 | #ifdef CONFIG_COMPACTION |
Namhyung Kim | 36deb0b | 2010-10-26 14:22:04 -0700 | [diff] [blame] | 574 | |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 575 | struct contig_page_info { |
| 576 | unsigned long free_pages; |
| 577 | unsigned long free_blocks_total; |
| 578 | unsigned long free_blocks_suitable; |
| 579 | }; |
| 580 | |
| 581 | /* |
| 582 | * Calculate the number of free pages in a zone, how many contiguous |
| 583 | * pages are free and how many are large enough to satisfy an allocation of |
| 584 | * the target size. Note that this function makes no attempt to estimate |
| 585 | * how many suitable free blocks there *might* be if MOVABLE pages were |
| 586 | * migrated. Calculating that is possible, but expensive and can be |
| 587 | * figured out from userspace |
| 588 | */ |
| 589 | static void fill_contig_page_info(struct zone *zone, |
| 590 | unsigned int suitable_order, |
| 591 | struct contig_page_info *info) |
| 592 | { |
| 593 | unsigned int order; |
| 594 | |
| 595 | info->free_pages = 0; |
| 596 | info->free_blocks_total = 0; |
| 597 | info->free_blocks_suitable = 0; |
| 598 | |
| 599 | for (order = 0; order < MAX_ORDER; order++) { |
| 600 | unsigned long blocks; |
| 601 | |
| 602 | /* Count number of free blocks */ |
| 603 | blocks = zone->free_area[order].nr_free; |
| 604 | info->free_blocks_total += blocks; |
| 605 | |
| 606 | /* Count free base pages */ |
| 607 | info->free_pages += blocks << order; |
| 608 | |
| 609 | /* Count the suitable free blocks */ |
| 610 | if (order >= suitable_order) |
| 611 | info->free_blocks_suitable += blocks << |
| 612 | (order - suitable_order); |
| 613 | } |
| 614 | } |
Mel Gorman | f1a5ab1 | 2010-05-24 14:32:26 -0700 | [diff] [blame] | 615 | |
| 616 | /* |
| 617 | * A fragmentation index only makes sense if an allocation of a requested |
| 618 | * size would fail. If that is true, the fragmentation index indicates |
| 619 | * whether external fragmentation or a lack of memory was the problem. |
| 620 | * The value can be used to determine if page reclaim or compaction |
| 621 | * should be used |
| 622 | */ |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 623 | static int __fragmentation_index(unsigned int order, struct contig_page_info *info) |
Mel Gorman | f1a5ab1 | 2010-05-24 14:32:26 -0700 | [diff] [blame] | 624 | { |
| 625 | unsigned long requested = 1UL << order; |
| 626 | |
| 627 | if (!info->free_blocks_total) |
| 628 | return 0; |
| 629 | |
| 630 | /* Fragmentation index only makes sense when a request would fail */ |
| 631 | if (info->free_blocks_suitable) |
| 632 | return -1000; |
| 633 | |
| 634 | /* |
| 635 | * Index is between 0 and 1 so return within 3 decimal places |
| 636 | * |
| 637 | * 0 => allocation would fail due to lack of memory |
| 638 | * 1 => allocation would fail due to fragmentation |
| 639 | */ |
| 640 | return 1000 - div_u64( (1000+(div_u64(info->free_pages * 1000ULL, requested))), info->free_blocks_total); |
| 641 | } |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 642 | |
| 643 | /* Same as __fragmentation index but allocs contig_page_info on stack */ |
| 644 | int fragmentation_index(struct zone *zone, unsigned int order) |
| 645 | { |
| 646 | struct contig_page_info info; |
| 647 | |
| 648 | fill_contig_page_info(zone, order, &info); |
| 649 | return __fragmentation_index(order, &info); |
| 650 | } |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 651 | #endif |
| 652 | |
| 653 | #if defined(CONFIG_PROC_FS) || defined(CONFIG_COMPACTION) |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 654 | #include <linux/proc_fs.h> |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 655 | #include <linux/seq_file.h> |
| 656 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 657 | static char * const migratetype_names[MIGRATE_TYPES] = { |
| 658 | "Unmovable", |
| 659 | "Reclaimable", |
| 660 | "Movable", |
| 661 | "Reserve", |
Michal Nazarewicz | 47118af | 2011-12-29 13:09:50 +0100 | [diff] [blame] | 662 | #ifdef CONFIG_CMA |
| 663 | "CMA", |
| 664 | #endif |
Minchan Kim | 194159f | 2013-02-22 16:33:58 -0800 | [diff] [blame] | 665 | #ifdef CONFIG_MEMORY_ISOLATION |
KOSAKI Motohiro | 91446b0 | 2008-04-15 14:34:42 -0700 | [diff] [blame] | 666 | "Isolate", |
Minchan Kim | 194159f | 2013-02-22 16:33:58 -0800 | [diff] [blame] | 667 | #endif |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 668 | }; |
| 669 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 670 | static void *frag_start(struct seq_file *m, loff_t *pos) |
| 671 | { |
| 672 | pg_data_t *pgdat; |
| 673 | loff_t node = *pos; |
| 674 | for (pgdat = first_online_pgdat(); |
| 675 | pgdat && node; |
| 676 | pgdat = next_online_pgdat(pgdat)) |
| 677 | --node; |
| 678 | |
| 679 | return pgdat; |
| 680 | } |
| 681 | |
| 682 | static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) |
| 683 | { |
| 684 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 685 | |
| 686 | (*pos)++; |
| 687 | return next_online_pgdat(pgdat); |
| 688 | } |
| 689 | |
| 690 | static void frag_stop(struct seq_file *m, void *arg) |
| 691 | { |
| 692 | } |
| 693 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 694 | /* Walk all the zones in a node and print using a callback */ |
| 695 | static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat, |
| 696 | void (*print)(struct seq_file *m, pg_data_t *, struct zone *)) |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 697 | { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 698 | struct zone *zone; |
| 699 | struct zone *node_zones = pgdat->node_zones; |
| 700 | unsigned long flags; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 701 | |
| 702 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { |
| 703 | if (!populated_zone(zone)) |
| 704 | continue; |
| 705 | |
| 706 | spin_lock_irqsave(&zone->lock, flags); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 707 | print(m, pgdat, zone); |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 708 | spin_unlock_irqrestore(&zone->lock, flags); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 709 | } |
| 710 | } |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 711 | #endif |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 712 | |
David Rientjes | 0d6617c | 2011-09-14 16:21:05 -0700 | [diff] [blame] | 713 | #if defined(CONFIG_PROC_FS) || defined(CONFIG_SYSFS) || defined(CONFIG_NUMA) |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 714 | #ifdef CONFIG_ZONE_DMA |
| 715 | #define TEXT_FOR_DMA(xx) xx "_dma", |
| 716 | #else |
| 717 | #define TEXT_FOR_DMA(xx) |
| 718 | #endif |
| 719 | |
| 720 | #ifdef CONFIG_ZONE_DMA32 |
| 721 | #define TEXT_FOR_DMA32(xx) xx "_dma32", |
| 722 | #else |
| 723 | #define TEXT_FOR_DMA32(xx) |
| 724 | #endif |
| 725 | |
| 726 | #ifdef CONFIG_HIGHMEM |
| 727 | #define TEXT_FOR_HIGHMEM(xx) xx "_high", |
| 728 | #else |
| 729 | #define TEXT_FOR_HIGHMEM(xx) |
| 730 | #endif |
| 731 | |
| 732 | #define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \ |
| 733 | TEXT_FOR_HIGHMEM(xx) xx "_movable", |
| 734 | |
| 735 | const char * const vmstat_text[] = { |
| 736 | /* Zoned VM counters */ |
| 737 | "nr_free_pages", |
Johannes Weiner | 81c0a2b | 2013-09-11 14:20:47 -0700 | [diff] [blame] | 738 | "nr_alloc_batch", |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 739 | "nr_inactive_anon", |
| 740 | "nr_active_anon", |
| 741 | "nr_inactive_file", |
| 742 | "nr_active_file", |
| 743 | "nr_unevictable", |
| 744 | "nr_mlock", |
| 745 | "nr_anon_pages", |
| 746 | "nr_mapped", |
| 747 | "nr_file_pages", |
| 748 | "nr_dirty", |
| 749 | "nr_writeback", |
| 750 | "nr_slab_reclaimable", |
| 751 | "nr_slab_unreclaimable", |
| 752 | "nr_page_table_pages", |
| 753 | "nr_kernel_stack", |
| 754 | "nr_unstable", |
| 755 | "nr_bounce", |
| 756 | "nr_vmscan_write", |
Mel Gorman | 49ea7eb | 2011-10-31 17:07:59 -0700 | [diff] [blame] | 757 | "nr_vmscan_immediate_reclaim", |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 758 | "nr_writeback_temp", |
| 759 | "nr_isolated_anon", |
| 760 | "nr_isolated_file", |
| 761 | "nr_shmem", |
| 762 | "nr_dirtied", |
| 763 | "nr_written", |
| 764 | |
| 765 | #ifdef CONFIG_NUMA |
| 766 | "numa_hit", |
| 767 | "numa_miss", |
| 768 | "numa_foreign", |
| 769 | "numa_interleave", |
| 770 | "numa_local", |
| 771 | "numa_other", |
| 772 | #endif |
Johannes Weiner | a528910 | 2014-04-03 14:47:51 -0700 | [diff] [blame] | 773 | "workingset_refault", |
| 774 | "workingset_activate", |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 775 | "nr_anon_transparent_hugepages", |
Bartlomiej Zolnierkiewicz | d1ce749 | 2012-10-08 16:32:02 -0700 | [diff] [blame] | 776 | "nr_free_cma", |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 777 | "nr_dirty_threshold", |
| 778 | "nr_dirty_background_threshold", |
| 779 | |
| 780 | #ifdef CONFIG_VM_EVENT_COUNTERS |
| 781 | "pgpgin", |
| 782 | "pgpgout", |
| 783 | "pswpin", |
| 784 | "pswpout", |
| 785 | |
| 786 | TEXTS_FOR_ZONES("pgalloc") |
| 787 | |
| 788 | "pgfree", |
| 789 | "pgactivate", |
| 790 | "pgdeactivate", |
| 791 | |
| 792 | "pgfault", |
| 793 | "pgmajfault", |
| 794 | |
| 795 | TEXTS_FOR_ZONES("pgrefill") |
Ying Han | 904249a | 2012-04-25 16:01:48 -0700 | [diff] [blame] | 796 | TEXTS_FOR_ZONES("pgsteal_kswapd") |
| 797 | TEXTS_FOR_ZONES("pgsteal_direct") |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 798 | TEXTS_FOR_ZONES("pgscan_kswapd") |
| 799 | TEXTS_FOR_ZONES("pgscan_direct") |
Mel Gorman | 68243e7 | 2012-07-31 16:44:39 -0700 | [diff] [blame] | 800 | "pgscan_direct_throttle", |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 801 | |
| 802 | #ifdef CONFIG_NUMA |
| 803 | "zone_reclaim_failed", |
| 804 | #endif |
| 805 | "pginodesteal", |
| 806 | "slabs_scanned", |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 807 | "kswapd_inodesteal", |
| 808 | "kswapd_low_wmark_hit_quickly", |
| 809 | "kswapd_high_wmark_hit_quickly", |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 810 | "pageoutrun", |
| 811 | "allocstall", |
| 812 | |
| 813 | "pgrotated", |
| 814 | |
Mel Gorman | 03c5a6e | 2012-11-02 14:52:48 +0000 | [diff] [blame] | 815 | #ifdef CONFIG_NUMA_BALANCING |
| 816 | "numa_pte_updates", |
Mel Gorman | 72403b4 | 2013-11-12 15:08:32 -0800 | [diff] [blame] | 817 | "numa_huge_pte_updates", |
Mel Gorman | 03c5a6e | 2012-11-02 14:52:48 +0000 | [diff] [blame] | 818 | "numa_hint_faults", |
| 819 | "numa_hint_faults_local", |
| 820 | "numa_pages_migrated", |
| 821 | #endif |
Mel Gorman | 5647bc2 | 2012-10-19 10:46:20 +0100 | [diff] [blame] | 822 | #ifdef CONFIG_MIGRATION |
| 823 | "pgmigrate_success", |
| 824 | "pgmigrate_fail", |
| 825 | #endif |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 826 | #ifdef CONFIG_COMPACTION |
Mel Gorman | 397487d | 2012-10-19 12:00:10 +0100 | [diff] [blame] | 827 | "compact_migrate_scanned", |
| 828 | "compact_free_scanned", |
| 829 | "compact_isolated", |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 830 | "compact_stall", |
| 831 | "compact_fail", |
| 832 | "compact_success", |
| 833 | #endif |
| 834 | |
| 835 | #ifdef CONFIG_HUGETLB_PAGE |
| 836 | "htlb_buddy_alloc_success", |
| 837 | "htlb_buddy_alloc_fail", |
| 838 | #endif |
| 839 | "unevictable_pgs_culled", |
| 840 | "unevictable_pgs_scanned", |
| 841 | "unevictable_pgs_rescued", |
| 842 | "unevictable_pgs_mlocked", |
| 843 | "unevictable_pgs_munlocked", |
| 844 | "unevictable_pgs_cleared", |
| 845 | "unevictable_pgs_stranded", |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 846 | |
| 847 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 848 | "thp_fault_alloc", |
| 849 | "thp_fault_fallback", |
| 850 | "thp_collapse_alloc", |
| 851 | "thp_collapse_alloc_failed", |
| 852 | "thp_split", |
Kirill A. Shutemov | d8a8e1f | 2012-12-12 13:51:09 -0800 | [diff] [blame] | 853 | "thp_zero_page_alloc", |
| 854 | "thp_zero_page_alloc_failed", |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 855 | #endif |
Mel Gorman | ec65993 | 2014-01-21 14:33:16 -0800 | [diff] [blame] | 856 | #ifdef CONFIG_DEBUG_TLBFLUSH |
Dave Hansen | 6df4686 | 2013-09-11 14:20:24 -0700 | [diff] [blame] | 857 | #ifdef CONFIG_SMP |
Dave Hansen | 9824cf9 | 2013-09-11 14:20:23 -0700 | [diff] [blame] | 858 | "nr_tlb_remote_flush", |
| 859 | "nr_tlb_remote_flush_received", |
Mel Gorman | ec65993 | 2014-01-21 14:33:16 -0800 | [diff] [blame] | 860 | #endif /* CONFIG_SMP */ |
Dave Hansen | 9824cf9 | 2013-09-11 14:20:23 -0700 | [diff] [blame] | 861 | "nr_tlb_local_flush_all", |
| 862 | "nr_tlb_local_flush_one", |
Mel Gorman | ec65993 | 2014-01-21 14:33:16 -0800 | [diff] [blame] | 863 | #endif /* CONFIG_DEBUG_TLBFLUSH */ |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 864 | |
| 865 | #endif /* CONFIG_VM_EVENTS_COUNTERS */ |
| 866 | }; |
David Rientjes | 0d6617c | 2011-09-14 16:21:05 -0700 | [diff] [blame] | 867 | #endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA */ |
KOSAKI Motohiro | fa25c50 | 2011-05-24 17:11:28 -0700 | [diff] [blame] | 868 | |
| 869 | |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 870 | #ifdef CONFIG_PROC_FS |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 871 | static void frag_show_print(struct seq_file *m, pg_data_t *pgdat, |
| 872 | struct zone *zone) |
| 873 | { |
| 874 | int order; |
| 875 | |
| 876 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); |
| 877 | for (order = 0; order < MAX_ORDER; ++order) |
| 878 | seq_printf(m, "%6lu ", zone->free_area[order].nr_free); |
| 879 | seq_putc(m, '\n'); |
| 880 | } |
| 881 | |
| 882 | /* |
| 883 | * This walks the free areas for each zone. |
| 884 | */ |
| 885 | static int frag_show(struct seq_file *m, void *arg) |
| 886 | { |
| 887 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 888 | walk_zones_in_node(m, pgdat, frag_show_print); |
| 889 | return 0; |
| 890 | } |
| 891 | |
| 892 | static void pagetypeinfo_showfree_print(struct seq_file *m, |
| 893 | pg_data_t *pgdat, struct zone *zone) |
| 894 | { |
| 895 | int order, mtype; |
| 896 | |
| 897 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) { |
| 898 | seq_printf(m, "Node %4d, zone %8s, type %12s ", |
| 899 | pgdat->node_id, |
| 900 | zone->name, |
| 901 | migratetype_names[mtype]); |
| 902 | for (order = 0; order < MAX_ORDER; ++order) { |
| 903 | unsigned long freecount = 0; |
| 904 | struct free_area *area; |
| 905 | struct list_head *curr; |
| 906 | |
| 907 | area = &(zone->free_area[order]); |
| 908 | |
| 909 | list_for_each(curr, &area->free_list[mtype]) |
| 910 | freecount++; |
| 911 | seq_printf(m, "%6lu ", freecount); |
| 912 | } |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 913 | seq_putc(m, '\n'); |
| 914 | } |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 915 | } |
| 916 | |
| 917 | /* Print out the free pages at each order for each migatetype */ |
| 918 | static int pagetypeinfo_showfree(struct seq_file *m, void *arg) |
| 919 | { |
| 920 | int order; |
| 921 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 922 | |
| 923 | /* Print header */ |
| 924 | seq_printf(m, "%-43s ", "Free pages count per migrate type at order"); |
| 925 | for (order = 0; order < MAX_ORDER; ++order) |
| 926 | seq_printf(m, "%6d ", order); |
| 927 | seq_putc(m, '\n'); |
| 928 | |
| 929 | walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print); |
| 930 | |
| 931 | return 0; |
| 932 | } |
| 933 | |
| 934 | static void pagetypeinfo_showblockcount_print(struct seq_file *m, |
| 935 | pg_data_t *pgdat, struct zone *zone) |
| 936 | { |
| 937 | int mtype; |
| 938 | unsigned long pfn; |
| 939 | unsigned long start_pfn = zone->zone_start_pfn; |
Cody P Schafer | 108bcc9 | 2013-02-22 16:35:23 -0800 | [diff] [blame] | 940 | unsigned long end_pfn = zone_end_pfn(zone); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 941 | unsigned long count[MIGRATE_TYPES] = { 0, }; |
| 942 | |
| 943 | for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) { |
| 944 | struct page *page; |
| 945 | |
| 946 | if (!pfn_valid(pfn)) |
| 947 | continue; |
| 948 | |
| 949 | page = pfn_to_page(pfn); |
Mel Gorman | eb33575 | 2009-05-13 17:34:48 +0100 | [diff] [blame] | 950 | |
| 951 | /* Watch for unexpected holes punched in the memmap */ |
| 952 | if (!memmap_valid_within(pfn, page, zone)) |
Mel Gorman | e80d6a2 | 2008-08-14 11:10:14 +0100 | [diff] [blame] | 953 | continue; |
Mel Gorman | eb33575 | 2009-05-13 17:34:48 +0100 | [diff] [blame] | 954 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 955 | mtype = get_pageblock_migratetype(page); |
| 956 | |
Mel Gorman | e80d6a2 | 2008-08-14 11:10:14 +0100 | [diff] [blame] | 957 | if (mtype < MIGRATE_TYPES) |
| 958 | count[mtype]++; |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 959 | } |
| 960 | |
| 961 | /* Print counts */ |
| 962 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); |
| 963 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) |
| 964 | seq_printf(m, "%12lu ", count[mtype]); |
| 965 | seq_putc(m, '\n'); |
| 966 | } |
| 967 | |
| 968 | /* Print out the free pages at each order for each migratetype */ |
| 969 | static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg) |
| 970 | { |
| 971 | int mtype; |
| 972 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 973 | |
| 974 | seq_printf(m, "\n%-23s", "Number of blocks type "); |
| 975 | for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) |
| 976 | seq_printf(m, "%12s ", migratetype_names[mtype]); |
| 977 | seq_putc(m, '\n'); |
| 978 | walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print); |
| 979 | |
| 980 | return 0; |
| 981 | } |
| 982 | |
| 983 | /* |
| 984 | * This prints out statistics in relation to grouping pages by mobility. |
| 985 | * It is expensive to collect so do not constantly read the file. |
| 986 | */ |
| 987 | static int pagetypeinfo_show(struct seq_file *m, void *arg) |
| 988 | { |
| 989 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 990 | |
KOSAKI Motohiro | 41b25a3 | 2008-04-30 00:52:13 -0700 | [diff] [blame] | 991 | /* check memoryless node */ |
Lai Jiangshan | a47b53c | 2012-12-12 13:51:37 -0800 | [diff] [blame] | 992 | if (!node_state(pgdat->node_id, N_MEMORY)) |
KOSAKI Motohiro | 41b25a3 | 2008-04-30 00:52:13 -0700 | [diff] [blame] | 993 | return 0; |
| 994 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 995 | seq_printf(m, "Page block order: %d\n", pageblock_order); |
| 996 | seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages); |
| 997 | seq_putc(m, '\n'); |
| 998 | pagetypeinfo_showfree(m, pgdat); |
| 999 | pagetypeinfo_showblockcount(m, pgdat); |
| 1000 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1001 | return 0; |
| 1002 | } |
| 1003 | |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 1004 | static const struct seq_operations fragmentation_op = { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1005 | .start = frag_start, |
| 1006 | .next = frag_next, |
| 1007 | .stop = frag_stop, |
| 1008 | .show = frag_show, |
| 1009 | }; |
| 1010 | |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 1011 | static int fragmentation_open(struct inode *inode, struct file *file) |
| 1012 | { |
| 1013 | return seq_open(file, &fragmentation_op); |
| 1014 | } |
| 1015 | |
| 1016 | static const struct file_operations fragmentation_file_operations = { |
| 1017 | .open = fragmentation_open, |
| 1018 | .read = seq_read, |
| 1019 | .llseek = seq_lseek, |
| 1020 | .release = seq_release, |
| 1021 | }; |
| 1022 | |
Alexey Dobriyan | 74e2e8e | 2008-10-06 04:15:36 +0400 | [diff] [blame] | 1023 | static const struct seq_operations pagetypeinfo_op = { |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 1024 | .start = frag_start, |
| 1025 | .next = frag_next, |
| 1026 | .stop = frag_stop, |
| 1027 | .show = pagetypeinfo_show, |
| 1028 | }; |
| 1029 | |
Alexey Dobriyan | 74e2e8e | 2008-10-06 04:15:36 +0400 | [diff] [blame] | 1030 | static int pagetypeinfo_open(struct inode *inode, struct file *file) |
| 1031 | { |
| 1032 | return seq_open(file, &pagetypeinfo_op); |
| 1033 | } |
| 1034 | |
| 1035 | static const struct file_operations pagetypeinfo_file_ops = { |
| 1036 | .open = pagetypeinfo_open, |
| 1037 | .read = seq_read, |
| 1038 | .llseek = seq_lseek, |
| 1039 | .release = seq_release, |
| 1040 | }; |
| 1041 | |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 1042 | static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, |
| 1043 | struct zone *zone) |
| 1044 | { |
| 1045 | int i; |
| 1046 | seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name); |
| 1047 | seq_printf(m, |
| 1048 | "\n pages free %lu" |
| 1049 | "\n min %lu" |
| 1050 | "\n low %lu" |
| 1051 | "\n high %lu" |
Wu Fengguang | 08d9ae7 | 2009-06-16 15:32:30 -0700 | [diff] [blame] | 1052 | "\n scanned %lu" |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 1053 | "\n spanned %lu" |
Jiang Liu | 9feedc9 | 2012-12-12 13:52:12 -0800 | [diff] [blame] | 1054 | "\n present %lu" |
| 1055 | "\n managed %lu", |
Mel Gorman | 88f5acf | 2011-01-13 15:45:41 -0800 | [diff] [blame] | 1056 | zone_page_state(zone, NR_FREE_PAGES), |
Mel Gorman | 4185896 | 2009-06-16 15:32:12 -0700 | [diff] [blame] | 1057 | min_wmark_pages(zone), |
| 1058 | low_wmark_pages(zone), |
| 1059 | high_wmark_pages(zone), |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 1060 | zone->pages_scanned, |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 1061 | zone->spanned_pages, |
Jiang Liu | 9feedc9 | 2012-12-12 13:52:12 -0800 | [diff] [blame] | 1062 | zone->present_pages, |
| 1063 | zone->managed_pages); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 1064 | |
| 1065 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 1066 | seq_printf(m, "\n %-12s %lu", vmstat_text[i], |
| 1067 | zone_page_state(zone, i)); |
| 1068 | |
| 1069 | seq_printf(m, |
| 1070 | "\n protection: (%lu", |
| 1071 | zone->lowmem_reserve[0]); |
| 1072 | for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++) |
| 1073 | seq_printf(m, ", %lu", zone->lowmem_reserve[i]); |
| 1074 | seq_printf(m, |
| 1075 | ")" |
| 1076 | "\n pagesets"); |
| 1077 | for_each_online_cpu(i) { |
| 1078 | struct per_cpu_pageset *pageset; |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 1079 | |
Christoph Lameter | 99dcc3e | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 1080 | pageset = per_cpu_ptr(zone->pageset, i); |
Christoph Lameter | 3dfa572 | 2008-02-04 22:29:19 -0800 | [diff] [blame] | 1081 | seq_printf(m, |
| 1082 | "\n cpu: %i" |
| 1083 | "\n count: %i" |
| 1084 | "\n high: %i" |
| 1085 | "\n batch: %i", |
| 1086 | i, |
| 1087 | pageset->pcp.count, |
| 1088 | pageset->pcp.high, |
| 1089 | pageset->pcp.batch); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 1090 | #ifdef CONFIG_SMP |
| 1091 | seq_printf(m, "\n vm stats threshold: %d", |
| 1092 | pageset->stat_threshold); |
| 1093 | #endif |
| 1094 | } |
| 1095 | seq_printf(m, |
| 1096 | "\n all_unreclaimable: %u" |
Rik van Riel | 556adec | 2008-10-18 20:26:34 -0700 | [diff] [blame] | 1097 | "\n start_pfn: %lu" |
| 1098 | "\n inactive_ratio: %u", |
Lisa Du | 6e543d5 | 2013-09-11 14:22:36 -0700 | [diff] [blame] | 1099 | !zone_reclaimable(zone), |
Rik van Riel | 556adec | 2008-10-18 20:26:34 -0700 | [diff] [blame] | 1100 | zone->zone_start_pfn, |
| 1101 | zone->inactive_ratio); |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 1102 | seq_putc(m, '\n'); |
| 1103 | } |
| 1104 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1105 | /* |
| 1106 | * Output information about zones in @pgdat. |
| 1107 | */ |
| 1108 | static int zoneinfo_show(struct seq_file *m, void *arg) |
| 1109 | { |
Mel Gorman | 467c996 | 2007-10-16 01:26:02 -0700 | [diff] [blame] | 1110 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 1111 | walk_zones_in_node(m, pgdat, zoneinfo_show_print); |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1112 | return 0; |
| 1113 | } |
| 1114 | |
Alexey Dobriyan | 5c9fe62 | 2008-10-06 04:19:42 +0400 | [diff] [blame] | 1115 | static const struct seq_operations zoneinfo_op = { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1116 | .start = frag_start, /* iterate over all zones. The same as in |
| 1117 | * fragmentation. */ |
| 1118 | .next = frag_next, |
| 1119 | .stop = frag_stop, |
| 1120 | .show = zoneinfo_show, |
| 1121 | }; |
| 1122 | |
Alexey Dobriyan | 5c9fe62 | 2008-10-06 04:19:42 +0400 | [diff] [blame] | 1123 | static int zoneinfo_open(struct inode *inode, struct file *file) |
| 1124 | { |
| 1125 | return seq_open(file, &zoneinfo_op); |
| 1126 | } |
| 1127 | |
| 1128 | static const struct file_operations proc_zoneinfo_file_operations = { |
| 1129 | .open = zoneinfo_open, |
| 1130 | .read = seq_read, |
| 1131 | .llseek = seq_lseek, |
| 1132 | .release = seq_release, |
| 1133 | }; |
| 1134 | |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 1135 | enum writeback_stat_item { |
| 1136 | NR_DIRTY_THRESHOLD, |
| 1137 | NR_DIRTY_BG_THRESHOLD, |
| 1138 | NR_VM_WRITEBACK_STAT_ITEMS, |
| 1139 | }; |
| 1140 | |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1141 | static void *vmstat_start(struct seq_file *m, loff_t *pos) |
| 1142 | { |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 1143 | unsigned long *v; |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 1144 | int i, stat_items_size; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1145 | |
| 1146 | if (*pos >= ARRAY_SIZE(vmstat_text)) |
| 1147 | return NULL; |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 1148 | stat_items_size = NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) + |
| 1149 | NR_VM_WRITEBACK_STAT_ITEMS * sizeof(unsigned long); |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1150 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 1151 | #ifdef CONFIG_VM_EVENT_COUNTERS |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 1152 | stat_items_size += sizeof(struct vm_event_state); |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 1153 | #endif |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 1154 | |
| 1155 | v = kmalloc(stat_items_size, GFP_KERNEL); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 1156 | m->private = v; |
| 1157 | if (!v) |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1158 | return ERR_PTR(-ENOMEM); |
Christoph Lameter | 2244b95 | 2006-06-30 01:55:33 -0700 | [diff] [blame] | 1159 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 1160 | v[i] = global_page_state(i); |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 1161 | v += NR_VM_ZONE_STAT_ITEMS; |
| 1162 | |
| 1163 | global_dirty_limits(v + NR_DIRTY_BG_THRESHOLD, |
| 1164 | v + NR_DIRTY_THRESHOLD); |
| 1165 | v += NR_VM_WRITEBACK_STAT_ITEMS; |
| 1166 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 1167 | #ifdef CONFIG_VM_EVENT_COUNTERS |
Michael Rubin | 79da826 | 2010-10-26 14:21:36 -0700 | [diff] [blame] | 1168 | all_vm_events(v); |
| 1169 | v[PGPGIN] /= 2; /* sectors -> kbytes */ |
| 1170 | v[PGPGOUT] /= 2; |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 1171 | #endif |
Wu Fengguang | ff8b16d | 2010-11-04 01:56:49 +0800 | [diff] [blame] | 1172 | return (unsigned long *)m->private + *pos; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1173 | } |
| 1174 | |
| 1175 | static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) |
| 1176 | { |
| 1177 | (*pos)++; |
| 1178 | if (*pos >= ARRAY_SIZE(vmstat_text)) |
| 1179 | return NULL; |
| 1180 | return (unsigned long *)m->private + *pos; |
| 1181 | } |
| 1182 | |
| 1183 | static int vmstat_show(struct seq_file *m, void *arg) |
| 1184 | { |
| 1185 | unsigned long *l = arg; |
| 1186 | unsigned long off = l - (unsigned long *)m->private; |
| 1187 | |
| 1188 | seq_printf(m, "%s %lu\n", vmstat_text[off], *l); |
| 1189 | return 0; |
| 1190 | } |
| 1191 | |
| 1192 | static void vmstat_stop(struct seq_file *m, void *arg) |
| 1193 | { |
| 1194 | kfree(m->private); |
| 1195 | m->private = NULL; |
| 1196 | } |
| 1197 | |
Alexey Dobriyan | b6aa44a | 2008-10-06 04:17:48 +0400 | [diff] [blame] | 1198 | static const struct seq_operations vmstat_op = { |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1199 | .start = vmstat_start, |
| 1200 | .next = vmstat_next, |
| 1201 | .stop = vmstat_stop, |
| 1202 | .show = vmstat_show, |
| 1203 | }; |
| 1204 | |
Alexey Dobriyan | b6aa44a | 2008-10-06 04:17:48 +0400 | [diff] [blame] | 1205 | static int vmstat_open(struct inode *inode, struct file *file) |
| 1206 | { |
| 1207 | return seq_open(file, &vmstat_op); |
| 1208 | } |
| 1209 | |
| 1210 | static const struct file_operations proc_vmstat_file_operations = { |
| 1211 | .open = vmstat_open, |
| 1212 | .read = seq_read, |
| 1213 | .llseek = seq_lseek, |
| 1214 | .release = seq_release, |
| 1215 | }; |
Christoph Lameter | f6ac235 | 2006-06-30 01:55:32 -0700 | [diff] [blame] | 1216 | #endif /* CONFIG_PROC_FS */ |
| 1217 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1218 | #ifdef CONFIG_SMP |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1219 | static DEFINE_PER_CPU(struct delayed_work, vmstat_work); |
Christoph Lameter | 77461ab | 2007-05-09 02:35:13 -0700 | [diff] [blame] | 1220 | int sysctl_stat_interval __read_mostly = HZ; |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1221 | |
| 1222 | static void vmstat_update(struct work_struct *w) |
| 1223 | { |
Christoph Lameter | fbc2edb | 2013-09-11 14:21:32 -0700 | [diff] [blame] | 1224 | refresh_cpu_vm_stats(); |
Christoph Lameter | 77461ab | 2007-05-09 02:35:13 -0700 | [diff] [blame] | 1225 | schedule_delayed_work(&__get_cpu_var(vmstat_work), |
Anton Blanchard | 98f4ebb | 2009-04-02 16:56:39 -0700 | [diff] [blame] | 1226 | round_jiffies_relative(sysctl_stat_interval)); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1227 | } |
| 1228 | |
Paul Gortmaker | 0db0628 | 2013-06-19 14:53:51 -0400 | [diff] [blame] | 1229 | static void start_cpu_timer(int cpu) |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1230 | { |
Tejun Heo | 1871e52 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 1231 | struct delayed_work *work = &per_cpu(vmstat_work, cpu); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1232 | |
Tejun Heo | 203b42f | 2012-08-21 13:18:23 -0700 | [diff] [blame] | 1233 | INIT_DEFERRABLE_WORK(work, vmstat_update); |
Tejun Heo | 1871e52 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 1234 | schedule_delayed_work_on(cpu, work, __round_jiffies_relative(HZ, cpu)); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1235 | } |
| 1236 | |
Toshi Kani | 807a1bd | 2013-11-12 15:08:13 -0800 | [diff] [blame] | 1237 | static void vmstat_cpu_dead(int node) |
| 1238 | { |
| 1239 | int cpu; |
| 1240 | |
| 1241 | get_online_cpus(); |
| 1242 | for_each_online_cpu(cpu) |
| 1243 | if (cpu_to_node(cpu) == node) |
| 1244 | goto end; |
| 1245 | |
| 1246 | node_clear_state(node, N_CPU); |
| 1247 | end: |
| 1248 | put_online_cpus(); |
| 1249 | } |
| 1250 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1251 | /* |
| 1252 | * Use the cpu notifier to insure that the thresholds are recalculated |
| 1253 | * when necessary. |
| 1254 | */ |
Paul Gortmaker | 0db0628 | 2013-06-19 14:53:51 -0400 | [diff] [blame] | 1255 | static int vmstat_cpuup_callback(struct notifier_block *nfb, |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1256 | unsigned long action, |
| 1257 | void *hcpu) |
| 1258 | { |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1259 | long cpu = (long)hcpu; |
| 1260 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1261 | switch (action) { |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1262 | case CPU_ONLINE: |
| 1263 | case CPU_ONLINE_FROZEN: |
KAMEZAWA Hiroyuki | 5ee28a4 | 2010-09-09 16:38:14 -0700 | [diff] [blame] | 1264 | refresh_zone_stat_thresholds(); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1265 | start_cpu_timer(cpu); |
Christoph Lameter | ad59692 | 2010-01-05 15:34:51 +0900 | [diff] [blame] | 1266 | node_set_state(cpu_to_node(cpu), N_CPU); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1267 | break; |
| 1268 | case CPU_DOWN_PREPARE: |
| 1269 | case CPU_DOWN_PREPARE_FROZEN: |
Tejun Heo | afe2c51 | 2010-12-14 16:21:17 +0100 | [diff] [blame] | 1270 | cancel_delayed_work_sync(&per_cpu(vmstat_work, cpu)); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1271 | per_cpu(vmstat_work, cpu).work.func = NULL; |
| 1272 | break; |
| 1273 | case CPU_DOWN_FAILED: |
| 1274 | case CPU_DOWN_FAILED_FROZEN: |
| 1275 | start_cpu_timer(cpu); |
| 1276 | break; |
Andy Whitcroft | ce421c7 | 2006-12-06 20:33:08 -0800 | [diff] [blame] | 1277 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1278 | case CPU_DEAD_FROZEN: |
Andy Whitcroft | ce421c7 | 2006-12-06 20:33:08 -0800 | [diff] [blame] | 1279 | refresh_zone_stat_thresholds(); |
Toshi Kani | 807a1bd | 2013-11-12 15:08:13 -0800 | [diff] [blame] | 1280 | vmstat_cpu_dead(cpu_to_node(cpu)); |
Andy Whitcroft | ce421c7 | 2006-12-06 20:33:08 -0800 | [diff] [blame] | 1281 | break; |
| 1282 | default: |
| 1283 | break; |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1284 | } |
| 1285 | return NOTIFY_OK; |
| 1286 | } |
| 1287 | |
Paul Gortmaker | 0db0628 | 2013-06-19 14:53:51 -0400 | [diff] [blame] | 1288 | static struct notifier_block vmstat_notifier = |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1289 | { &vmstat_cpuup_callback, NULL, 0 }; |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 1290 | #endif |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1291 | |
Adrian Bunk | e2fc88d | 2007-10-16 01:26:27 -0700 | [diff] [blame] | 1292 | static int __init setup_vmstat(void) |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1293 | { |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 1294 | #ifdef CONFIG_SMP |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1295 | int cpu; |
| 1296 | |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1297 | register_cpu_notifier(&vmstat_notifier); |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1298 | |
Toshi Kani | d7e0b37 | 2013-11-12 15:08:12 -0800 | [diff] [blame] | 1299 | get_online_cpus(); |
| 1300 | for_each_online_cpu(cpu) { |
Christoph Lameter | d1187ed | 2007-05-09 02:35:12 -0700 | [diff] [blame] | 1301 | start_cpu_timer(cpu); |
Toshi Kani | d7e0b37 | 2013-11-12 15:08:12 -0800 | [diff] [blame] | 1302 | node_set_state(cpu_to_node(cpu), N_CPU); |
| 1303 | } |
| 1304 | put_online_cpus(); |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 1305 | #endif |
| 1306 | #ifdef CONFIG_PROC_FS |
| 1307 | proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations); |
Alexey Dobriyan | 74e2e8e | 2008-10-06 04:15:36 +0400 | [diff] [blame] | 1308 | proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops); |
Alexey Dobriyan | b6aa44a | 2008-10-06 04:17:48 +0400 | [diff] [blame] | 1309 | proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations); |
Alexey Dobriyan | 5c9fe62 | 2008-10-06 04:19:42 +0400 | [diff] [blame] | 1310 | proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations); |
Alexey Dobriyan | 8f32f7e | 2008-10-06 04:13:52 +0400 | [diff] [blame] | 1311 | #endif |
Christoph Lameter | df9ecab | 2006-08-31 21:27:35 -0700 | [diff] [blame] | 1312 | return 0; |
| 1313 | } |
| 1314 | module_init(setup_vmstat) |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 1315 | |
| 1316 | #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_COMPACTION) |
| 1317 | #include <linux/debugfs.h> |
| 1318 | |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 1319 | |
| 1320 | /* |
| 1321 | * Return an index indicating how much of the available free memory is |
| 1322 | * unusable for an allocation of the requested size. |
| 1323 | */ |
| 1324 | static int unusable_free_index(unsigned int order, |
| 1325 | struct contig_page_info *info) |
| 1326 | { |
| 1327 | /* No free memory is interpreted as all free memory is unusable */ |
| 1328 | if (info->free_pages == 0) |
| 1329 | return 1000; |
| 1330 | |
| 1331 | /* |
| 1332 | * Index should be a value between 0 and 1. Return a value to 3 |
| 1333 | * decimal places. |
| 1334 | * |
| 1335 | * 0 => no fragmentation |
| 1336 | * 1 => high fragmentation |
| 1337 | */ |
| 1338 | return div_u64((info->free_pages - (info->free_blocks_suitable << order)) * 1000ULL, info->free_pages); |
| 1339 | |
| 1340 | } |
| 1341 | |
| 1342 | static void unusable_show_print(struct seq_file *m, |
| 1343 | pg_data_t *pgdat, struct zone *zone) |
| 1344 | { |
| 1345 | unsigned int order; |
| 1346 | int index; |
| 1347 | struct contig_page_info info; |
| 1348 | |
| 1349 | seq_printf(m, "Node %d, zone %8s ", |
| 1350 | pgdat->node_id, |
| 1351 | zone->name); |
| 1352 | for (order = 0; order < MAX_ORDER; ++order) { |
| 1353 | fill_contig_page_info(zone, order, &info); |
| 1354 | index = unusable_free_index(order, &info); |
| 1355 | seq_printf(m, "%d.%03d ", index / 1000, index % 1000); |
| 1356 | } |
| 1357 | |
| 1358 | seq_putc(m, '\n'); |
| 1359 | } |
| 1360 | |
| 1361 | /* |
| 1362 | * Display unusable free space index |
| 1363 | * |
| 1364 | * The unusable free space index measures how much of the available free |
| 1365 | * memory cannot be used to satisfy an allocation of a given size and is a |
| 1366 | * value between 0 and 1. The higher the value, the more of free memory is |
| 1367 | * unusable and by implication, the worse the external fragmentation is. This |
| 1368 | * can be expressed as a percentage by multiplying by 100. |
| 1369 | */ |
| 1370 | static int unusable_show(struct seq_file *m, void *arg) |
| 1371 | { |
| 1372 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 1373 | |
| 1374 | /* check memoryless node */ |
Lai Jiangshan | a47b53c | 2012-12-12 13:51:37 -0800 | [diff] [blame] | 1375 | if (!node_state(pgdat->node_id, N_MEMORY)) |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 1376 | return 0; |
| 1377 | |
| 1378 | walk_zones_in_node(m, pgdat, unusable_show_print); |
| 1379 | |
| 1380 | return 0; |
| 1381 | } |
| 1382 | |
| 1383 | static const struct seq_operations unusable_op = { |
| 1384 | .start = frag_start, |
| 1385 | .next = frag_next, |
| 1386 | .stop = frag_stop, |
| 1387 | .show = unusable_show, |
| 1388 | }; |
| 1389 | |
| 1390 | static int unusable_open(struct inode *inode, struct file *file) |
| 1391 | { |
| 1392 | return seq_open(file, &unusable_op); |
| 1393 | } |
| 1394 | |
| 1395 | static const struct file_operations unusable_file_ops = { |
| 1396 | .open = unusable_open, |
| 1397 | .read = seq_read, |
| 1398 | .llseek = seq_lseek, |
| 1399 | .release = seq_release, |
| 1400 | }; |
| 1401 | |
Mel Gorman | f1a5ab1 | 2010-05-24 14:32:26 -0700 | [diff] [blame] | 1402 | static void extfrag_show_print(struct seq_file *m, |
| 1403 | pg_data_t *pgdat, struct zone *zone) |
| 1404 | { |
| 1405 | unsigned int order; |
| 1406 | int index; |
| 1407 | |
| 1408 | /* Alloc on stack as interrupts are disabled for zone walk */ |
| 1409 | struct contig_page_info info; |
| 1410 | |
| 1411 | seq_printf(m, "Node %d, zone %8s ", |
| 1412 | pgdat->node_id, |
| 1413 | zone->name); |
| 1414 | for (order = 0; order < MAX_ORDER; ++order) { |
| 1415 | fill_contig_page_info(zone, order, &info); |
Mel Gorman | 56de726 | 2010-05-24 14:32:30 -0700 | [diff] [blame] | 1416 | index = __fragmentation_index(order, &info); |
Mel Gorman | f1a5ab1 | 2010-05-24 14:32:26 -0700 | [diff] [blame] | 1417 | seq_printf(m, "%d.%03d ", index / 1000, index % 1000); |
| 1418 | } |
| 1419 | |
| 1420 | seq_putc(m, '\n'); |
| 1421 | } |
| 1422 | |
| 1423 | /* |
| 1424 | * Display fragmentation index for orders that allocations would fail for |
| 1425 | */ |
| 1426 | static int extfrag_show(struct seq_file *m, void *arg) |
| 1427 | { |
| 1428 | pg_data_t *pgdat = (pg_data_t *)arg; |
| 1429 | |
| 1430 | walk_zones_in_node(m, pgdat, extfrag_show_print); |
| 1431 | |
| 1432 | return 0; |
| 1433 | } |
| 1434 | |
| 1435 | static const struct seq_operations extfrag_op = { |
| 1436 | .start = frag_start, |
| 1437 | .next = frag_next, |
| 1438 | .stop = frag_stop, |
| 1439 | .show = extfrag_show, |
| 1440 | }; |
| 1441 | |
| 1442 | static int extfrag_open(struct inode *inode, struct file *file) |
| 1443 | { |
| 1444 | return seq_open(file, &extfrag_op); |
| 1445 | } |
| 1446 | |
| 1447 | static const struct file_operations extfrag_file_ops = { |
| 1448 | .open = extfrag_open, |
| 1449 | .read = seq_read, |
| 1450 | .llseek = seq_lseek, |
| 1451 | .release = seq_release, |
| 1452 | }; |
| 1453 | |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 1454 | static int __init extfrag_debug_init(void) |
| 1455 | { |
Sasikantha babu | bde8bd8 | 2012-05-29 15:06:22 -0700 | [diff] [blame] | 1456 | struct dentry *extfrag_debug_root; |
| 1457 | |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 1458 | extfrag_debug_root = debugfs_create_dir("extfrag", NULL); |
| 1459 | if (!extfrag_debug_root) |
| 1460 | return -ENOMEM; |
| 1461 | |
| 1462 | if (!debugfs_create_file("unusable_index", 0444, |
| 1463 | extfrag_debug_root, NULL, &unusable_file_ops)) |
Sasikantha babu | bde8bd8 | 2012-05-29 15:06:22 -0700 | [diff] [blame] | 1464 | goto fail; |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 1465 | |
Mel Gorman | f1a5ab1 | 2010-05-24 14:32:26 -0700 | [diff] [blame] | 1466 | if (!debugfs_create_file("extfrag_index", 0444, |
| 1467 | extfrag_debug_root, NULL, &extfrag_file_ops)) |
Sasikantha babu | bde8bd8 | 2012-05-29 15:06:22 -0700 | [diff] [blame] | 1468 | goto fail; |
Mel Gorman | f1a5ab1 | 2010-05-24 14:32:26 -0700 | [diff] [blame] | 1469 | |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 1470 | return 0; |
Sasikantha babu | bde8bd8 | 2012-05-29 15:06:22 -0700 | [diff] [blame] | 1471 | fail: |
| 1472 | debugfs_remove_recursive(extfrag_debug_root); |
| 1473 | return -ENOMEM; |
Mel Gorman | d7a5752 | 2010-05-24 14:32:25 -0700 | [diff] [blame] | 1474 | } |
| 1475 | |
| 1476 | module_init(extfrag_debug_init); |
| 1477 | #endif |