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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/fs.h>
3#include <linux/init.h>
4#include <linux/kernel.h>
5#include <linux/mm.h>
6#include <linux/hugetlb.h>
7#include <linux/mman.h>
8#include <linux/mmzone.h>
9#include <linux/proc_fs.h>
10#include <linux/percpu.h>
11#include <linux/seq_file.h>
12#include <linux/swap.h>
13#include <linux/vmstat.h>
14#include <linux/atomic.h>
15#include <linux/vmalloc.h>
16#ifdef CONFIG_CMA
17#include <linux/cma.h>
18#endif
19#include <asm/page.h>
20#include "internal.h"
21
22void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
23{
24}
25
26static void show_val_kb(struct seq_file *m, const char *s, unsigned long num)
27{
28 seq_put_decimal_ull_width(m, s, num << (PAGE_SHIFT - 10), 8);
29 seq_write(m, " kB\n", 4);
30}
31
32static int meminfo_proc_show(struct seq_file *m, void *v)
33{
34 struct sysinfo i;
35 unsigned long committed;
36 long cached;
37 long available;
38 unsigned long pages[NR_LRU_LISTS];
39 unsigned long sreclaimable, sunreclaim;
40 int lru;
41
42 si_meminfo(&i);
43 si_swapinfo(&i);
44 committed = vm_memory_committed();
45
46 cached = global_node_page_state(NR_FILE_PAGES) -
47 total_swapcache_pages() - i.bufferram;
48 if (cached < 0)
49 cached = 0;
50
51 for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
52 pages[lru] = global_node_page_state(NR_LRU_BASE + lru);
53
54 available = si_mem_available();
55 sreclaimable = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B);
56 sunreclaim = global_node_page_state_pages(NR_SLAB_UNRECLAIMABLE_B);
57
58 show_val_kb(m, "MemTotal: ", i.totalram);
59 show_val_kb(m, "MemFree: ", i.freeram);
60 show_val_kb(m, "MemAvailable: ", available);
61 show_val_kb(m, "Buffers: ", i.bufferram);
62 show_val_kb(m, "Cached: ", cached);
63 show_val_kb(m, "SwapCached: ", total_swapcache_pages());
64 show_val_kb(m, "Active: ", pages[LRU_ACTIVE_ANON] +
65 pages[LRU_ACTIVE_FILE]);
66 show_val_kb(m, "Inactive: ", pages[LRU_INACTIVE_ANON] +
67 pages[LRU_INACTIVE_FILE]);
68 show_val_kb(m, "Active(anon): ", pages[LRU_ACTIVE_ANON]);
69 show_val_kb(m, "Inactive(anon): ", pages[LRU_INACTIVE_ANON]);
70 show_val_kb(m, "Active(file): ", pages[LRU_ACTIVE_FILE]);
71 show_val_kb(m, "Inactive(file): ", pages[LRU_INACTIVE_FILE]);
72 show_val_kb(m, "Unevictable: ", pages[LRU_UNEVICTABLE]);
73 show_val_kb(m, "Mlocked: ", global_zone_page_state(NR_MLOCK));
74
75#ifdef CONFIG_HIGHMEM
76 show_val_kb(m, "HighTotal: ", i.totalhigh);
77 show_val_kb(m, "HighFree: ", i.freehigh);
78 show_val_kb(m, "LowTotal: ", i.totalram - i.totalhigh);
79 show_val_kb(m, "LowFree: ", i.freeram - i.freehigh);
80#endif
81
82#ifndef CONFIG_MMU
83 show_val_kb(m, "MmapCopy: ",
84 (unsigned long)atomic_long_read(&mmap_pages_allocated));
85#endif
86
87 show_val_kb(m, "SwapTotal: ", i.totalswap);
88 show_val_kb(m, "SwapFree: ", i.freeswap);
89#ifdef CONFIG_ZSWAP
90 seq_printf(m, "Zswap: %8lu kB\n",
91 (unsigned long)(zswap_pool_total_size >> 10));
92 seq_printf(m, "Zswapped: %8lu kB\n",
93 (unsigned long)atomic_read(&zswap_stored_pages) <<
94 (PAGE_SHIFT - 10));
95#endif
96 show_val_kb(m, "Dirty: ",
97 global_node_page_state(NR_FILE_DIRTY));
98 show_val_kb(m, "Writeback: ",
99 global_node_page_state(NR_WRITEBACK));
100 show_val_kb(m, "AnonPages: ",
101 global_node_page_state(NR_ANON_MAPPED));
102 show_val_kb(m, "Mapped: ",
103 global_node_page_state(NR_FILE_MAPPED));
104 show_val_kb(m, "Shmem: ", i.sharedram);
105 show_val_kb(m, "KReclaimable: ", sreclaimable +
106 global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE));
107 show_val_kb(m, "Slab: ", sreclaimable + sunreclaim);
108 show_val_kb(m, "SReclaimable: ", sreclaimable);
109 show_val_kb(m, "SUnreclaim: ", sunreclaim);
110 seq_printf(m, "KernelStack: %8lu kB\n",
111 global_node_page_state(NR_KERNEL_STACK_KB));
112#ifdef CONFIG_SHADOW_CALL_STACK
113 seq_printf(m, "ShadowCallStack:%8lu kB\n",
114 global_node_page_state(NR_KERNEL_SCS_KB));
115#endif
116 show_val_kb(m, "PageTables: ",
117 global_node_page_state(NR_PAGETABLE));
118 show_val_kb(m, "SecPageTables: ",
119 global_node_page_state(NR_SECONDARY_PAGETABLE));
120
121 show_val_kb(m, "NFS_Unstable: ", 0);
122 show_val_kb(m, "Bounce: ",
123 global_zone_page_state(NR_BOUNCE));
124 show_val_kb(m, "WritebackTmp: ",
125 global_node_page_state(NR_WRITEBACK_TEMP));
126 show_val_kb(m, "CommitLimit: ", vm_commit_limit());
127 show_val_kb(m, "Committed_AS: ", committed);
128 seq_printf(m, "VmallocTotal: %8lu kB\n",
129 (unsigned long)VMALLOC_TOTAL >> 10);
130 show_val_kb(m, "VmallocUsed: ", vmalloc_nr_pages());
131 show_val_kb(m, "VmallocChunk: ", 0ul);
132 show_val_kb(m, "Percpu: ", pcpu_nr_pages());
133
134#ifdef CONFIG_MEMORY_FAILURE
135 seq_printf(m, "HardwareCorrupted: %5lu kB\n",
136 atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10));
137#endif
138
139#ifdef CONFIG_TRANSPARENT_HUGEPAGE
140 show_val_kb(m, "AnonHugePages: ",
141 global_node_page_state(NR_ANON_THPS));
142 show_val_kb(m, "ShmemHugePages: ",
143 global_node_page_state(NR_SHMEM_THPS));
144 show_val_kb(m, "ShmemPmdMapped: ",
145 global_node_page_state(NR_SHMEM_PMDMAPPED));
146 show_val_kb(m, "FileHugePages: ",
147 global_node_page_state(NR_FILE_THPS));
148 show_val_kb(m, "FilePmdMapped: ",
149 global_node_page_state(NR_FILE_PMDMAPPED));
150#endif
151
152#ifdef CONFIG_CMA
153 show_val_kb(m, "CmaTotal: ", totalcma_pages);
154 show_val_kb(m, "CmaFree: ",
155 global_zone_page_state(NR_FREE_CMA_PAGES));
156#endif
157
158 hugetlb_report_meminfo(m);
159
160 arch_report_meminfo(m);
161
162 return 0;
163}
164
165static int __init proc_meminfo_init(void)
166{
167 struct proc_dir_entry *pde;
168
169 pde = proc_create_single("meminfo", 0, NULL, meminfo_proc_show);
170 pde_make_permanent(pde);
171 return 0;
172}
173fs_initcall(proc_meminfo_init);
1#include <linux/fs.h>
2#include <linux/init.h>
3#include <linux/kernel.h>
4#include <linux/mm.h>
5#include <linux/hugetlb.h>
6#include <linux/mman.h>
7#include <linux/mmzone.h>
8#include <linux/proc_fs.h>
9#include <linux/quicklist.h>
10#include <linux/seq_file.h>
11#include <linux/swap.h>
12#include <linux/vmstat.h>
13#include <linux/atomic.h>
14#include <linux/vmalloc.h>
15#include <asm/page.h>
16#include <asm/pgtable.h>
17#include "internal.h"
18
19void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
20{
21}
22
23static int meminfo_proc_show(struct seq_file *m, void *v)
24{
25 struct sysinfo i;
26 unsigned long committed;
27 struct vmalloc_info vmi;
28 long cached;
29 long available;
30 unsigned long pagecache;
31 unsigned long wmark_low = 0;
32 unsigned long pages[NR_LRU_LISTS];
33 struct zone *zone;
34 int lru;
35
36/*
37 * display in kilobytes.
38 */
39#define K(x) ((x) << (PAGE_SHIFT - 10))
40 si_meminfo(&i);
41 si_swapinfo(&i);
42 committed = percpu_counter_read_positive(&vm_committed_as);
43
44 cached = global_page_state(NR_FILE_PAGES) -
45 total_swapcache_pages() - i.bufferram;
46 if (cached < 0)
47 cached = 0;
48
49 get_vmalloc_info(&vmi);
50
51 for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
52 pages[lru] = global_page_state(NR_LRU_BASE + lru);
53
54 for_each_zone(zone)
55 wmark_low += zone->watermark[WMARK_LOW];
56
57 /*
58 * Estimate the amount of memory available for userspace allocations,
59 * without causing swapping.
60 *
61 * Free memory cannot be taken below the low watermark, before the
62 * system starts swapping.
63 */
64 available = i.freeram - wmark_low;
65
66 /*
67 * Not all the page cache can be freed, otherwise the system will
68 * start swapping. Assume at least half of the page cache, or the
69 * low watermark worth of cache, needs to stay.
70 */
71 pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE];
72 pagecache -= min(pagecache / 2, wmark_low);
73 available += pagecache;
74
75 /*
76 * Part of the reclaimable slab consists of items that are in use,
77 * and cannot be freed. Cap this estimate at the low watermark.
78 */
79 available += global_page_state(NR_SLAB_RECLAIMABLE) -
80 min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low);
81
82 if (available < 0)
83 available = 0;
84
85 /*
86 * Tagged format, for easy grepping and expansion.
87 */
88 seq_printf(m,
89 "MemTotal: %8lu kB\n"
90 "MemFree: %8lu kB\n"
91 "MemAvailable: %8lu kB\n"
92 "Buffers: %8lu kB\n"
93 "Cached: %8lu kB\n"
94 "SwapCached: %8lu kB\n"
95 "Active: %8lu kB\n"
96 "Inactive: %8lu kB\n"
97 "Active(anon): %8lu kB\n"
98 "Inactive(anon): %8lu kB\n"
99 "Active(file): %8lu kB\n"
100 "Inactive(file): %8lu kB\n"
101 "Unevictable: %8lu kB\n"
102 "Mlocked: %8lu kB\n"
103#ifdef CONFIG_HIGHMEM
104 "HighTotal: %8lu kB\n"
105 "HighFree: %8lu kB\n"
106 "LowTotal: %8lu kB\n"
107 "LowFree: %8lu kB\n"
108#endif
109#ifndef CONFIG_MMU
110 "MmapCopy: %8lu kB\n"
111#endif
112 "SwapTotal: %8lu kB\n"
113 "SwapFree: %8lu kB\n"
114 "Dirty: %8lu kB\n"
115 "Writeback: %8lu kB\n"
116 "AnonPages: %8lu kB\n"
117 "Mapped: %8lu kB\n"
118 "Shmem: %8lu kB\n"
119 "Slab: %8lu kB\n"
120 "SReclaimable: %8lu kB\n"
121 "SUnreclaim: %8lu kB\n"
122 "KernelStack: %8lu kB\n"
123 "PageTables: %8lu kB\n"
124#ifdef CONFIG_QUICKLIST
125 "Quicklists: %8lu kB\n"
126#endif
127 "NFS_Unstable: %8lu kB\n"
128 "Bounce: %8lu kB\n"
129 "WritebackTmp: %8lu kB\n"
130 "CommitLimit: %8lu kB\n"
131 "Committed_AS: %8lu kB\n"
132 "VmallocTotal: %8lu kB\n"
133 "VmallocUsed: %8lu kB\n"
134 "VmallocChunk: %8lu kB\n"
135#ifdef CONFIG_MEMORY_FAILURE
136 "HardwareCorrupted: %5lu kB\n"
137#endif
138#ifdef CONFIG_TRANSPARENT_HUGEPAGE
139 "AnonHugePages: %8lu kB\n"
140#endif
141 ,
142 K(i.totalram),
143 K(i.freeram),
144 K(available),
145 K(i.bufferram),
146 K(cached),
147 K(total_swapcache_pages()),
148 K(pages[LRU_ACTIVE_ANON] + pages[LRU_ACTIVE_FILE]),
149 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
150 K(pages[LRU_ACTIVE_ANON]),
151 K(pages[LRU_INACTIVE_ANON]),
152 K(pages[LRU_ACTIVE_FILE]),
153 K(pages[LRU_INACTIVE_FILE]),
154 K(pages[LRU_UNEVICTABLE]),
155 K(global_page_state(NR_MLOCK)),
156#ifdef CONFIG_HIGHMEM
157 K(i.totalhigh),
158 K(i.freehigh),
159 K(i.totalram-i.totalhigh),
160 K(i.freeram-i.freehigh),
161#endif
162#ifndef CONFIG_MMU
163 K((unsigned long) atomic_long_read(&mmap_pages_allocated)),
164#endif
165 K(i.totalswap),
166 K(i.freeswap),
167 K(global_page_state(NR_FILE_DIRTY)),
168 K(global_page_state(NR_WRITEBACK)),
169 K(global_page_state(NR_ANON_PAGES)),
170 K(global_page_state(NR_FILE_MAPPED)),
171 K(global_page_state(NR_SHMEM)),
172 K(global_page_state(NR_SLAB_RECLAIMABLE) +
173 global_page_state(NR_SLAB_UNRECLAIMABLE)),
174 K(global_page_state(NR_SLAB_RECLAIMABLE)),
175 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
176 global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024,
177 K(global_page_state(NR_PAGETABLE)),
178#ifdef CONFIG_QUICKLIST
179 K(quicklist_total_size()),
180#endif
181 K(global_page_state(NR_UNSTABLE_NFS)),
182 K(global_page_state(NR_BOUNCE)),
183 K(global_page_state(NR_WRITEBACK_TEMP)),
184 K(vm_commit_limit()),
185 K(committed),
186 (unsigned long)VMALLOC_TOTAL >> 10,
187 vmi.used >> 10,
188 vmi.largest_chunk >> 10
189#ifdef CONFIG_MEMORY_FAILURE
190 ,atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10)
191#endif
192#ifdef CONFIG_TRANSPARENT_HUGEPAGE
193 ,K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
194 HPAGE_PMD_NR)
195#endif
196 );
197
198 hugetlb_report_meminfo(m);
199
200 arch_report_meminfo(m);
201
202 return 0;
203#undef K
204}
205
206static int meminfo_proc_open(struct inode *inode, struct file *file)
207{
208 return single_open(file, meminfo_proc_show, NULL);
209}
210
211static const struct file_operations meminfo_proc_fops = {
212 .open = meminfo_proc_open,
213 .read = seq_read,
214 .llseek = seq_lseek,
215 .release = single_release,
216};
217
218static int __init proc_meminfo_init(void)
219{
220 proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
221 return 0;
222}
223fs_initcall(proc_meminfo_init);