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
show_node(struct zone * zone)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
si_mem_available(void)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
si_meminfo(struct sysinfo * val)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
si_meminfo_node(struct sysinfo * val,int nid)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 */
show_mem_node_skip(unsigned int flags,int nid,nodemask_t * nodemask)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
show_migration_types(unsigned char type)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
node_has_managed_zones(pg_data_t * pgdat,int max_zone_idx)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 */
show_free_areas(unsigned int filter,nodemask_t * nodemask,int max_zone_idx)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
__show_mem(unsigned int filter,nodemask_t * nodemask,int max_zone_idx)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 }
427