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[NR_PAGE_ORDERS], flags, total = 0; 356 unsigned char types[NR_PAGE_ORDERS]; 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 < NR_PAGE_ORDERS; 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 < NR_PAGE_ORDERS; 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 #ifdef CONFIG_MEM_ALLOC_PROFILING 427 { 428 struct codetag_bytes tags[10]; 429 size_t i, nr; 430 431 nr = alloc_tag_top_users(tags, ARRAY_SIZE(tags), false); 432 if (nr) { 433 pr_notice("Memory allocations:\n"); 434 for (i = 0; i < nr; i++) { 435 struct codetag *ct = tags[i].ct; 436 struct alloc_tag *tag = ct_to_alloc_tag(ct); 437 struct alloc_tag_counters counter = alloc_tag_read(tag); 438 439 /* Same as alloc_tag_to_text() but w/o intermediate buffer */ 440 if (ct->modname) 441 pr_notice("%12lli %8llu %s:%u [%s] func:%s\n", 442 counter.bytes, counter.calls, ct->filename, 443 ct->lineno, ct->modname, ct->function); 444 else 445 pr_notice("%12lli %8llu %s:%u func:%s\n", 446 counter.bytes, counter.calls, ct->filename, 447 ct->lineno, ct->function); 448 } 449 } 450 } 451 #endif 452 } 453