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(item: 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(item: NR_ACTIVE_FILE) + |
55 | global_node_page_state(item: 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(item: NR_SLAB_RECLAIMABLE_B) + |
65 | global_node_page_state(item: 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(item: NR_SHMEM); |
79 | val->freeram = global_zone_page_state(item: 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(zone: &pgdat->node_zones[zone_type]); |
99 | val->totalram = managed_pages; |
100 | val->sharedram = node_page_state(pgdat, item: NR_SHMEM); |
101 | val->freeram = sum_zone_node_page_state(node: nid, item: 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(zone: 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(flags: filter, nid: 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(flags: filter, nid: 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(flags: filter, nid: 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(flags: filter, nid: 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, migratetype: type)) |
376 | types[order] |= 1 << type; |
377 | } |
378 | } |
379 | spin_unlock_irqrestore(lock: &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(type: 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(flags: 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 | } |
427 | |