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 pages[NR_LRU_LISTS]; 38 unsigned long reclaimable; 39 struct zone *zone; 40 int lru; 41 42 for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++) 43 pages[lru] = global_node_page_state(NR_LRU_BASE + lru); 44 45 for_each_zone(zone) 46 wmark_low += low_wmark_pages(zone); 47 48 /* 49 * Estimate the amount of memory available for userspace allocations, 50 * without causing swapping or OOM. 51 */ 52 available = global_zone_page_state(NR_FREE_PAGES) - totalreserve_pages; 53 54 /* 55 * Not all the page cache can be freed, otherwise the system will 56 * start swapping or thrashing. Assume at least half of the page 57 * cache, or the low watermark worth of cache, needs to stay. 58 */ 59 pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE]; 60 pagecache -= min(pagecache / 2, wmark_low); 61 available += pagecache; 62 63 /* 64 * Part of the reclaimable slab and other kernel memory consists of 65 * items that are in use, and cannot be freed. Cap this estimate at the 66 * low watermark. 67 */ 68 reclaimable = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B) + 69 global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE); 70 available += reclaimable - min(reclaimable / 2, wmark_low); 71 72 if (available < 0) 73 available = 0; 74 return available; 75 } 76 EXPORT_SYMBOL_GPL(si_mem_available); 77 78 void si_meminfo(struct sysinfo *val) 79 { 80 val->totalram = totalram_pages(); 81 val->sharedram = global_node_page_state(NR_SHMEM); 82 val->freeram = global_zone_page_state(NR_FREE_PAGES); 83 val->bufferram = nr_blockdev_pages(); 84 val->totalhigh = totalhigh_pages(); 85 val->freehigh = nr_free_highpages(); 86 val->mem_unit = PAGE_SIZE; 87 } 88 89 EXPORT_SYMBOL(si_meminfo); 90 91 #ifdef CONFIG_NUMA 92 void si_meminfo_node(struct sysinfo *val, int nid) 93 { 94 int zone_type; /* needs to be signed */ 95 unsigned long managed_pages = 0; 96 unsigned long managed_highpages = 0; 97 unsigned long free_highpages = 0; 98 pg_data_t *pgdat = NODE_DATA(nid); 99 100 for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) 101 managed_pages += zone_managed_pages(&pgdat->node_zones[zone_type]); 102 val->totalram = managed_pages; 103 val->sharedram = node_page_state(pgdat, NR_SHMEM); 104 val->freeram = sum_zone_node_page_state(nid, NR_FREE_PAGES); 105 #ifdef CONFIG_HIGHMEM 106 for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) { 107 struct zone *zone = &pgdat->node_zones[zone_type]; 108 109 if (is_highmem(zone)) { 110 managed_highpages += zone_managed_pages(zone); 111 free_highpages += zone_page_state(zone, NR_FREE_PAGES); 112 } 113 } 114 val->totalhigh = managed_highpages; 115 val->freehigh = free_highpages; 116 #else 117 val->totalhigh = managed_highpages; 118 val->freehigh = free_highpages; 119 #endif 120 val->mem_unit = PAGE_SIZE; 121 } 122 #endif 123 124 /* 125 * Determine whether the node should be displayed or not, depending on whether 126 * SHOW_MEM_FILTER_NODES was passed to show_free_areas(). 127 */ 128 static bool show_mem_node_skip(unsigned int flags, int nid, nodemask_t *nodemask) 129 { 130 if (!(flags & SHOW_MEM_FILTER_NODES)) 131 return false; 132 133 /* 134 * no node mask - aka implicit memory numa policy. Do not bother with 135 * the synchronization - read_mems_allowed_begin - because we do not 136 * have to be precise here. 137 */ 138 if (!nodemask) 139 nodemask = &cpuset_current_mems_allowed; 140 141 return !node_isset(nid, *nodemask); 142 } 143 144 static void show_migration_types(unsigned char type) 145 { 146 static const char types[MIGRATE_TYPES] = { 147 [MIGRATE_UNMOVABLE] = 'U', 148 [MIGRATE_MOVABLE] = 'M', 149 [MIGRATE_RECLAIMABLE] = 'E', 150 [MIGRATE_HIGHATOMIC] = 'H', 151 #ifdef CONFIG_CMA 152 [MIGRATE_CMA] = 'C', 153 #endif 154 #ifdef CONFIG_MEMORY_ISOLATION 155 [MIGRATE_ISOLATE] = 'I', 156 #endif 157 }; 158 char tmp[MIGRATE_TYPES + 1]; 159 char *p = tmp; 160 int i; 161 162 for (i = 0; i < MIGRATE_TYPES; i++) { 163 if (type & (1 << i)) 164 *p++ = types[i]; 165 } 166 167 *p = '\0'; 168 printk(KERN_CONT "(%s) ", tmp); 169 } 170 171 static bool node_has_managed_zones(pg_data_t *pgdat, int max_zone_idx) 172 { 173 int zone_idx; 174 for (zone_idx = 0; zone_idx <= max_zone_idx; zone_idx++) 175 if (zone_managed_pages(pgdat->node_zones + zone_idx)) 176 return true; 177 return false; 178 } 179 180 /* 181 * Show free area list (used inside shift_scroll-lock stuff) 182 * We also calculate the percentage fragmentation. We do this by counting the 183 * memory on each free list with the exception of the first item on the list. 184 * 185 * Bits in @filter: 186 * SHOW_MEM_FILTER_NODES: suppress nodes that are not allowed by current's 187 * cpuset. 188 */ 189 void __show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_zone_idx) 190 { 191 unsigned long free_pcp = 0; 192 int cpu, nid; 193 struct zone *zone; 194 pg_data_t *pgdat; 195 196 for_each_populated_zone(zone) { 197 if (zone_idx(zone) > max_zone_idx) 198 continue; 199 if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask)) 200 continue; 201 202 for_each_online_cpu(cpu) 203 free_pcp += per_cpu_ptr(zone->per_cpu_pageset, cpu)->count; 204 } 205 206 printk("active_anon:%lu inactive_anon:%lu isolated_anon:%lu\n" 207 " active_file:%lu inactive_file:%lu isolated_file:%lu\n" 208 " unevictable:%lu dirty:%lu writeback:%lu\n" 209 " slab_reclaimable:%lu slab_unreclaimable:%lu\n" 210 " mapped:%lu shmem:%lu pagetables:%lu\n" 211 " sec_pagetables:%lu bounce:%lu\n" 212 " kernel_misc_reclaimable:%lu\n" 213 " free:%lu free_pcp:%lu free_cma:%lu\n", 214 global_node_page_state(NR_ACTIVE_ANON), 215 global_node_page_state(NR_INACTIVE_ANON), 216 global_node_page_state(NR_ISOLATED_ANON), 217 global_node_page_state(NR_ACTIVE_FILE), 218 global_node_page_state(NR_INACTIVE_FILE), 219 global_node_page_state(NR_ISOLATED_FILE), 220 global_node_page_state(NR_UNEVICTABLE), 221 global_node_page_state(NR_FILE_DIRTY), 222 global_node_page_state(NR_WRITEBACK), 223 global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B), 224 global_node_page_state_pages(NR_SLAB_UNRECLAIMABLE_B), 225 global_node_page_state(NR_FILE_MAPPED), 226 global_node_page_state(NR_SHMEM), 227 global_node_page_state(NR_PAGETABLE), 228 global_node_page_state(NR_SECONDARY_PAGETABLE), 229 global_zone_page_state(NR_BOUNCE), 230 global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE), 231 global_zone_page_state(NR_FREE_PAGES), 232 free_pcp, 233 global_zone_page_state(NR_FREE_CMA_PAGES)); 234 235 for_each_online_pgdat(pgdat) { 236 if (show_mem_node_skip(filter, pgdat->node_id, nodemask)) 237 continue; 238 if (!node_has_managed_zones(pgdat, max_zone_idx)) 239 continue; 240 241 printk("Node %d" 242 " active_anon:%lukB" 243 " inactive_anon:%lukB" 244 " active_file:%lukB" 245 " inactive_file:%lukB" 246 " unevictable:%lukB" 247 " isolated(anon):%lukB" 248 " isolated(file):%lukB" 249 " mapped:%lukB" 250 " dirty:%lukB" 251 " writeback:%lukB" 252 " shmem:%lukB" 253 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 254 " shmem_thp: %lukB" 255 " shmem_pmdmapped: %lukB" 256 " anon_thp: %lukB" 257 #endif 258 " writeback_tmp:%lukB" 259 " kernel_stack:%lukB" 260 #ifdef CONFIG_SHADOW_CALL_STACK 261 " shadow_call_stack:%lukB" 262 #endif 263 " pagetables:%lukB" 264 " sec_pagetables:%lukB" 265 " all_unreclaimable? %s" 266 "\n", 267 pgdat->node_id, 268 K(node_page_state(pgdat, NR_ACTIVE_ANON)), 269 K(node_page_state(pgdat, NR_INACTIVE_ANON)), 270 K(node_page_state(pgdat, NR_ACTIVE_FILE)), 271 K(node_page_state(pgdat, NR_INACTIVE_FILE)), 272 K(node_page_state(pgdat, NR_UNEVICTABLE)), 273 K(node_page_state(pgdat, NR_ISOLATED_ANON)), 274 K(node_page_state(pgdat, NR_ISOLATED_FILE)), 275 K(node_page_state(pgdat, NR_FILE_MAPPED)), 276 K(node_page_state(pgdat, NR_FILE_DIRTY)), 277 K(node_page_state(pgdat, NR_WRITEBACK)), 278 K(node_page_state(pgdat, NR_SHMEM)), 279 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 280 K(node_page_state(pgdat, NR_SHMEM_THPS)), 281 K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED)), 282 K(node_page_state(pgdat, NR_ANON_THPS)), 283 #endif 284 K(node_page_state(pgdat, NR_WRITEBACK_TEMP)), 285 node_page_state(pgdat, NR_KERNEL_STACK_KB), 286 #ifdef CONFIG_SHADOW_CALL_STACK 287 node_page_state(pgdat, NR_KERNEL_SCS_KB), 288 #endif 289 K(node_page_state(pgdat, NR_PAGETABLE)), 290 K(node_page_state(pgdat, NR_SECONDARY_PAGETABLE)), 291 pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES ? 292 "yes" : "no"); 293 } 294 295 for_each_populated_zone(zone) { 296 int i; 297 298 if (zone_idx(zone) > max_zone_idx) 299 continue; 300 if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask)) 301 continue; 302 303 free_pcp = 0; 304 for_each_online_cpu(cpu) 305 free_pcp += per_cpu_ptr(zone->per_cpu_pageset, cpu)->count; 306 307 show_node(zone); 308 printk(KERN_CONT 309 "%s" 310 " free:%lukB" 311 " boost:%lukB" 312 " min:%lukB" 313 " low:%lukB" 314 " high:%lukB" 315 " reserved_highatomic:%luKB" 316 " active_anon:%lukB" 317 " inactive_anon:%lukB" 318 " active_file:%lukB" 319 " inactive_file:%lukB" 320 " unevictable:%lukB" 321 " writepending:%lukB" 322 " present:%lukB" 323 " managed:%lukB" 324 " mlocked:%lukB" 325 " bounce:%lukB" 326 " free_pcp:%lukB" 327 " local_pcp:%ukB" 328 " free_cma:%lukB" 329 "\n", 330 zone->name, 331 K(zone_page_state(zone, NR_FREE_PAGES)), 332 K(zone->watermark_boost), 333 K(min_wmark_pages(zone)), 334 K(low_wmark_pages(zone)), 335 K(high_wmark_pages(zone)), 336 K(zone->nr_reserved_highatomic), 337 K(zone_page_state(zone, NR_ZONE_ACTIVE_ANON)), 338 K(zone_page_state(zone, NR_ZONE_INACTIVE_ANON)), 339 K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE)), 340 K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE)), 341 K(zone_page_state(zone, NR_ZONE_UNEVICTABLE)), 342 K(zone_page_state(zone, NR_ZONE_WRITE_PENDING)), 343 K(zone->present_pages), 344 K(zone_managed_pages(zone)), 345 K(zone_page_state(zone, NR_MLOCK)), 346 K(zone_page_state(zone, NR_BOUNCE)), 347 K(free_pcp), 348 K(this_cpu_read(zone->per_cpu_pageset->count)), 349 K(zone_page_state(zone, NR_FREE_CMA_PAGES))); 350 printk("lowmem_reserve[]:"); 351 for (i = 0; i < MAX_NR_ZONES; i++) 352 printk(KERN_CONT " %ld", zone->lowmem_reserve[i]); 353 printk(KERN_CONT "\n"); 354 } 355 356 for_each_populated_zone(zone) { 357 unsigned int order; 358 unsigned long nr[MAX_ORDER + 1], flags, total = 0; 359 unsigned char types[MAX_ORDER + 1]; 360 361 if (zone_idx(zone) > max_zone_idx) 362 continue; 363 if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask)) 364 continue; 365 show_node(zone); 366 printk(KERN_CONT "%s: ", zone->name); 367 368 spin_lock_irqsave(&zone->lock, flags); 369 for (order = 0; order <= MAX_ORDER; order++) { 370 struct free_area *area = &zone->free_area[order]; 371 int type; 372 373 nr[order] = area->nr_free; 374 total += nr[order] << order; 375 376 types[order] = 0; 377 for (type = 0; type < MIGRATE_TYPES; type++) { 378 if (!free_area_empty(area, type)) 379 types[order] |= 1 << type; 380 } 381 } 382 spin_unlock_irqrestore(&zone->lock, flags); 383 for (order = 0; order <= MAX_ORDER; order++) { 384 printk(KERN_CONT "%lu*%lukB ", 385 nr[order], K(1UL) << order); 386 if (nr[order]) 387 show_migration_types(types[order]); 388 } 389 printk(KERN_CONT "= %lukB\n", K(total)); 390 } 391 392 for_each_online_node(nid) { 393 if (show_mem_node_skip(filter, nid, nodemask)) 394 continue; 395 hugetlb_show_meminfo_node(nid); 396 } 397 398 printk("%ld total pagecache pages\n", global_node_page_state(NR_FILE_PAGES)); 399 400 show_swap_cache_info(); 401 } 402 403 void __show_mem(unsigned int filter, nodemask_t *nodemask, int max_zone_idx) 404 { 405 unsigned long total = 0, reserved = 0, highmem = 0; 406 struct zone *zone; 407 408 printk("Mem-Info:\n"); 409 __show_free_areas(filter, nodemask, max_zone_idx); 410 411 for_each_populated_zone(zone) { 412 413 total += zone->present_pages; 414 reserved += zone->present_pages - zone_managed_pages(zone); 415 416 if (is_highmem(zone)) 417 highmem += zone->present_pages; 418 } 419 420 printk("%lu pages RAM\n", total); 421 printk("%lu pages HighMem/MovableOnly\n", highmem); 422 printk("%lu pages reserved\n", reserved); 423 #ifdef CONFIG_CMA 424 printk("%lu pages cma reserved\n", totalcma_pages); 425 #endif 426 #ifdef CONFIG_MEMORY_FAILURE 427 printk("%lu pages hwpoisoned\n", atomic_long_read(&num_poisoned_pages)); 428 #endif 429 } 430