mm/show_mem.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Generic show_mem() implementation
   4  *
   5  * Copyright (C) 2008 Johannes Weiner <hannes@saeurebad.de>
   6  */
   7
   8 #include <linux/blkdev.h>
   9 #include <linux/cma.h>
  10 #include <linux/cpuset.h>
  11 #include <linux/highmem.h>
  12 #include <linux/hugetlb.h>
  13 #include <linux/mm.h>
  14 #include <linux/mmzone.h>
  15 #include <linux/swap.h>
  16 #include <linux/vmstat.h>
  17
  18 #include "internal.h"
  19 #include "swap.h"
  20
  21 atomic_long_t _totalram_pages __read_mostly;
  22 EXPORT_SYMBOL(_totalram_pages);
  23 unsigned long totalreserve_pages __read_mostly;
  24 unsigned long totalcma_pages __read_mostly;
  25
  26 static inline void show_node(struct zone *zone)
  27 {
  28         if (IS_ENABLED(CONFIG_NUMA))
  29                 printk("Node %d ", zone_to_nid(zone));
  30 }
  31
  32 long si_mem_available(void)
  33 {
  34         long available;
  35         unsigned long pagecache;
  36         unsigned long wmark_low = 0;
  37         unsigned long reclaimable;
  38         struct zone *zone;
  39
  40         for_each_zone(zone)
  41                 wmark_low += low_wmark_pages(zone);
  42
  43         /*
  44          * Estimate the amount of memory available for userspace allocations,
  45          * without causing swapping or OOM.
  46          */
  47         available = global_zone_page_state(NR_FREE_PAGES) - totalreserve_pages;
  48
  49         /*
  50          * Not all the page cache can be freed, otherwise the system will
  51          * start swapping or thrashing. Assume at least half of the page
  52          * cache, or the low watermark worth of cache, needs to stay.
  53          */
  54         pagecache = global_node_page_state(NR_ACTIVE_FILE) +
  55                 global_node_page_state(NR_INACTIVE_FILE);
  56         pagecache -= min(pagecache / 2, wmark_low);
  57         available += pagecache;
  58
  59         /*
  60          * Part of the reclaimable slab and other kernel memory consists of
  61          * items that are in use, and cannot be freed. Cap this estimate at the
  62          * low watermark.
  63          */
  64         reclaimable = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B) +
  65                 global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE);
  66         reclaimable -= min(reclaimable / 2, wmark_low);
  67         available += reclaimable;
  68
  69         if (available < 0)
  70                 available = 0;
  71         return available;
  72 }
  73 EXPORT_SYMBOL_GPL(si_mem_available);
  74
  75 void si_meminfo(struct sysinfo *val)
  76 {
  77         val->totalram = totalram_pages();
  78         val->sharedram = global_node_page_state(NR_SHMEM);
  79         val->freeram = global_zone_page_state(NR_FREE_PAGES);
  80         val->bufferram = nr_blockdev_pages();
  81         val->totalhigh = totalhigh_pages();
  82         val->freehigh = nr_free_highpages();
  83         val->mem_unit = PAGE_SIZE;
  84 }
  85
  86 EXPORT_SYMBOL(si_meminfo);
  87
  88 #ifdef CONFIG_NUMA
  89 void si_meminfo_node(struct sysinfo *val, int nid)
  90 {
  91         int zone_type;          /* needs to be signed */
  92         unsigned long managed_pages = 0;
  93         unsigned long managed_highpages = 0;
  94         unsigned long free_highpages = 0;
  95         pg_data_t *pgdat = NODE_DATA(nid);
  96
  97         for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++)
  98                 managed_pages += zone_managed_pages(&pgdat->node_zones[zone_type]);
  99         val->totalram = managed_pages;
 100         val->sharedram = node_page_state(pgdat, NR_SHMEM);
 101         val->freeram = sum_zone_node_page_state(nid, NR_FREE_PAGES);
 102 #ifdef CONFIG_HIGHMEM
 103         for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) {
 104                 struct zone *zone = &pgdat->node_zones[zone_type];
 105
 106                 if (is_highmem(zone)) {
 107                         managed_highpages += zone_managed_pages(zone);
 108                         free_highpages += zone_page_state(zone, NR_FREE_PAGES);
 109                 }
 110         }
 111         val->totalhigh = managed_highpages;
 112         val->freehigh = free_highpages;
 113 #else
 114         val->totalhigh = managed_highpages;
 115         val->freehigh = free_highpages;
 116 #endif
 117         val->mem_unit = PAGE_SIZE;
 118 }
 119 #endif
 120
 121 /*
 122  * Determine whether the node should be displayed or not, depending on whether
 123  * SHOW_MEM_FILTER_NODES was passed to show_free_areas().
 124  */
 125 static bool show_mem_node_skip(unsigned int flags, int nid, nodemask_t *nodemask)
 126 {
 127         if (!(flags & SHOW_MEM_FILTER_NODES))
 128                 return false;
 129
 130         /*
 131          * no node mask - aka implicit memory numa policy. Do not bother with
 132          * the synchronization - read_mems_allowed_begin - because we do not
 133          * have to be precise here.
 134          */
 135         if (!nodemask)
 136                 nodemask = &cpuset_current_mems_allowed;
 137
 138         return !node_isset(nid, *nodemask);
 139 }
 140
 141 static void show_migration_types(unsigned char type)
 142 {
 143         static const char types[MIGRATE_TYPES] = {
 144                 [MIGRATE_UNMOVABLE]     = 'U',
 145                 [MIGRATE_MOVABLE]       = 'M',
 146                 [MIGRATE_RECLAIMABLE]   = 'E',
 147                 [MIGRATE_HIGHATOMIC]    = 'H',
 148 #ifdef CONFIG_CMA
 149                 [MIGRATE_CMA]           = 'C',
 150 #endif
 151 #ifdef CONFIG_MEMORY_ISOLATION
 152                 [MIGRATE_ISOLATE]       = 'I',
 153 #endif
 154         };
 155         char tmp[MIGRATE_TYPES + 1];
 156         char *p = tmp;
 157         int i;
 158
 159         for (i = 0; i < MIGRATE_TYPES; i++) {
 160                 if (type & (1 << i))
 161                         *p++ = types[i];
 162         }
 163
 164         *p = '\0';
 165         printk(KERN_CONT "(%s) ", tmp);
 166 }
 167
 168 static bool node_has_managed_zones(pg_data_t *pgdat, int max_zone_idx)
 169 {
 170         int zone_idx;
 171         for (zone_idx = 0; zone_idx <= max_zone_idx; zone_idx++)
 172                 if (zone_managed_pages(pgdat->node_zones + zone_idx))
 173                         return true;
 174         return false;
 175 }
 176
 177 /*
 178  * Show free area list (used inside shift_scroll-lock stuff)
 179  * We also calculate the percentage fragmentation. We do this by counting the
 180  * memory on each free list with the exception of the first item on the list.
 181  *
 182  * Bits in @filter:
 183  * SHOW_MEM_FILTER_NODES: suppress nodes that are not allowed by current's
 184  *   cpuset.
 185  */
 186 static void show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_zone_idx)
 187 {
 188         unsigned long free_pcp = 0;
 189         int cpu, nid;
 190         struct zone *zone;
 191         pg_data_t *pgdat;
 192
 193         for_each_populated_zone(zone) {
 194                 if (zone_idx(zone) > max_zone_idx)
 195                         continue;
 196                 if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask))
 197                         continue;
 198
 199                 for_each_online_cpu(cpu)
 200                         free_pcp += per_cpu_ptr(zone->per_cpu_pageset, cpu)->count;
 201         }
 202
 203         printk("active_anon:%lu inactive_anon:%lu isolated_anon:%lu\n"
 204                 " active_file:%lu inactive_file:%lu isolated_file:%lu\n"
 205                 " unevictable:%lu dirty:%lu writeback:%lu\n"
 206                 " slab_reclaimable:%lu slab_unreclaimable:%lu\n"
 207                 " mapped:%lu shmem:%lu pagetables:%lu\n"
 208                 " sec_pagetables:%lu bounce:%lu\n"
 209                 " kernel_misc_reclaimable:%lu\n"
 210                 " free:%lu free_pcp:%lu free_cma:%lu\n",
 211                 global_node_page_state(NR_ACTIVE_ANON),
 212                 global_node_page_state(NR_INACTIVE_ANON),
 213                 global_node_page_state(NR_ISOLATED_ANON),
 214                 global_node_page_state(NR_ACTIVE_FILE),
 215                 global_node_page_state(NR_INACTIVE_FILE),
 216                 global_node_page_state(NR_ISOLATED_FILE),
 217                 global_node_page_state(NR_UNEVICTABLE),
 218                 global_node_page_state(NR_FILE_DIRTY),
 219                 global_node_page_state(NR_WRITEBACK),
 220                 global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B),
 221                 global_node_page_state_pages(NR_SLAB_UNRECLAIMABLE_B),
 222                 global_node_page_state(NR_FILE_MAPPED),
 223                 global_node_page_state(NR_SHMEM),
 224                 global_node_page_state(NR_PAGETABLE),
 225                 global_node_page_state(NR_SECONDARY_PAGETABLE),
 226                 global_zone_page_state(NR_BOUNCE),
 227                 global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE),
 228                 global_zone_page_state(NR_FREE_PAGES),
 229                 free_pcp,
 230                 global_zone_page_state(NR_FREE_CMA_PAGES));
 231
 232         for_each_online_pgdat(pgdat) {
 233                 if (show_mem_node_skip(filter, pgdat->node_id, nodemask))
 234                         continue;
 235                 if (!node_has_managed_zones(pgdat, max_zone_idx))
 236                         continue;
 237
 238                 printk("Node %d"
 239                         " active_anon:%lukB"
 240                         " inactive_anon:%lukB"
 241                         " active_file:%lukB"
 242                         " inactive_file:%lukB"
 243                         " unevictable:%lukB"
 244                         " isolated(anon):%lukB"
 245                         " isolated(file):%lukB"
 246                         " mapped:%lukB"
 247                         " dirty:%lukB"
 248                         " writeback:%lukB"
 249                         " shmem:%lukB"
 250 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 251                         " shmem_thp:%lukB"
 252                         " shmem_pmdmapped:%lukB"
 253                         " anon_thp:%lukB"
 254 #endif
 255                         " writeback_tmp:%lukB"
 256                         " kernel_stack:%lukB"
 257 #ifdef CONFIG_SHADOW_CALL_STACK
 258                         " shadow_call_stack:%lukB"
 259 #endif
 260                         " pagetables:%lukB"
 261                         " sec_pagetables:%lukB"
 262                         " all_unreclaimable? %s"
 263                         "\n",
 264                         pgdat->node_id,
 265                         K(node_page_state(pgdat, NR_ACTIVE_ANON)),
 266                         K(node_page_state(pgdat, NR_INACTIVE_ANON)),
 267                         K(node_page_state(pgdat, NR_ACTIVE_FILE)),
 268                         K(node_page_state(pgdat, NR_INACTIVE_FILE)),
 269                         K(node_page_state(pgdat, NR_UNEVICTABLE)),
 270                         K(node_page_state(pgdat, NR_ISOLATED_ANON)),
 271                         K(node_page_state(pgdat, NR_ISOLATED_FILE)),
 272                         K(node_page_state(pgdat, NR_FILE_MAPPED)),
 273                         K(node_page_state(pgdat, NR_FILE_DIRTY)),
 274                         K(node_page_state(pgdat, NR_WRITEBACK)),
 275                         K(node_page_state(pgdat, NR_SHMEM)),
 276 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 277                         K(node_page_state(pgdat, NR_SHMEM_THPS)),
 278                         K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED)),
 279                         K(node_page_state(pgdat, NR_ANON_THPS)),
 280 #endif
 281                         K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
 282                         node_page_state(pgdat, NR_KERNEL_STACK_KB),
 283 #ifdef CONFIG_SHADOW_CALL_STACK
 284                         node_page_state(pgdat, NR_KERNEL_SCS_KB),
 285 #endif
 286                         K(node_page_state(pgdat, NR_PAGETABLE)),
 287                         K(node_page_state(pgdat, NR_SECONDARY_PAGETABLE)),
 288                         pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES ?
 289                                 "yes" : "no");
 290         }
 291
 292         for_each_populated_zone(zone) {
 293                 int i;
 294
 295                 if (zone_idx(zone) > max_zone_idx)
 296                         continue;
 297                 if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask))
 298                         continue;
 299
 300                 free_pcp = 0;
 301                 for_each_online_cpu(cpu)
 302                         free_pcp += per_cpu_ptr(zone->per_cpu_pageset, cpu)->count;
 303
 304                 show_node(zone);
 305                 printk(KERN_CONT
 306                         "%s"
 307                         " free:%lukB"
 308                         " boost:%lukB"
 309                         " min:%lukB"
 310                         " low:%lukB"
 311                         " high:%lukB"
 312                         " reserved_highatomic:%luKB"
 313                         " active_anon:%lukB"
 314                         " inactive_anon:%lukB"
 315                         " active_file:%lukB"
 316                         " inactive_file:%lukB"
 317                         " unevictable:%lukB"
 318                         " writepending:%lukB"
 319                         " present:%lukB"
 320                         " managed:%lukB"
 321                         " mlocked:%lukB"
 322                         " bounce:%lukB"
 323                         " free_pcp:%lukB"
 324                         " local_pcp:%ukB"
 325                         " free_cma:%lukB"
 326                         "\n",
 327                         zone->name,
 328                         K(zone_page_state(zone, NR_FREE_PAGES)),
 329                         K(zone->watermark_boost),
 330                         K(min_wmark_pages(zone)),
 331                         K(low_wmark_pages(zone)),
 332                         K(high_wmark_pages(zone)),
 333                         K(zone->nr_reserved_highatomic),
 334                         K(zone_page_state(zone, NR_ZONE_ACTIVE_ANON)),
 335                         K(zone_page_state(zone, NR_ZONE_INACTIVE_ANON)),
 336                         K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE)),
 337                         K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE)),
 338                         K(zone_page_state(zone, NR_ZONE_UNEVICTABLE)),
 339                         K(zone_page_state(zone, NR_ZONE_WRITE_PENDING)),
 340                         K(zone->present_pages),
 341                         K(zone_managed_pages(zone)),
 342                         K(zone_page_state(zone, NR_MLOCK)),
 343                         K(zone_page_state(zone, NR_BOUNCE)),
 344                         K(free_pcp),
 345                         K(this_cpu_read(zone->per_cpu_pageset->count)),
 346                         K(zone_page_state(zone, NR_FREE_CMA_PAGES)));
 347                 printk("lowmem_reserve[]:");
 348                 for (i = 0; i < MAX_NR_ZONES; i++)
 349                         printk(KERN_CONT " %ld", zone->lowmem_reserve[i]);
 350                 printk(KERN_CONT "\n");
 351         }
 352
 353         for_each_populated_zone(zone) {
 354                 unsigned int order;
 355                 unsigned long nr[MAX_ORDER + 1], flags, total = 0;
 356                 unsigned char types[MAX_ORDER + 1];
 357
 358                 if (zone_idx(zone) > max_zone_idx)
 359                         continue;
 360                 if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask))
 361                         continue;
 362                 show_node(zone);
 363                 printk(KERN_CONT "%s: ", zone->name);
 364
 365                 spin_lock_irqsave(&zone->lock, flags);
 366                 for (order = 0; order <= MAX_ORDER; order++) {
 367                         struct free_area *area = &zone->free_area[order];
 368                         int type;
 369
 370                         nr[order] = area->nr_free;
 371                         total += nr[order] << order;
 372
 373                         types[order] = 0;
 374                         for (type = 0; type < MIGRATE_TYPES; type++) {
 375                                 if (!free_area_empty(area, type))
 376                                         types[order] |= 1 << type;
 377                         }
 378                 }
 379                 spin_unlock_irqrestore(&zone->lock, flags);
 380                 for (order = 0; order <= MAX_ORDER; order++) {
 381                         printk(KERN_CONT "%lu*%lukB ",
 382                                nr[order], K(1UL) << order);
 383                         if (nr[order])
 384                                 show_migration_types(types[order]);
 385                 }
 386                 printk(KERN_CONT "= %lukB\n", K(total));
 387         }
 388
 389         for_each_online_node(nid) {
 390                 if (show_mem_node_skip(filter, nid, nodemask))
 391                         continue;
 392                 hugetlb_show_meminfo_node(nid);
 393         }
 394
 395         printk("%ld total pagecache pages\n", global_node_page_state(NR_FILE_PAGES));
 396
 397         show_swap_cache_info();
 398 }
 399
 400 void __show_mem(unsigned int filter, nodemask_t *nodemask, int max_zone_idx)
 401 {
 402         unsigned long total = 0, reserved = 0, highmem = 0;
 403         struct zone *zone;
 404
 405         printk("Mem-Info:\n");
 406         show_free_areas(filter, nodemask, max_zone_idx);
 407
 408         for_each_populated_zone(zone) {
 409
 410                 total += zone->present_pages;
 411                 reserved += zone->present_pages - zone_managed_pages(zone);
 412
 413                 if (is_highmem(zone))
 414                         highmem += zone->present_pages;
 415         }
 416
 417         printk("%lu pages RAM\n", total);
 418         printk("%lu pages HighMem/MovableOnly\n", highmem);
 419         printk("%lu pages reserved\n", reserved);
 420 #ifdef CONFIG_CMA
 421         printk("%lu pages cma reserved\n", totalcma_pages);
 422 #endif
 423 #ifdef CONFIG_MEMORY_FAILURE
 424         printk("%lu pages hwpoisoned\n", atomic_long_read(&num_poisoned_pages));
 425 #endif
 426 }