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/memblock.h>
10#include <linux/proc_fs.h>
11#include <linux/percpu.h>
12#include <linux/seq_file.h>
13#include <linux/swap.h>
14#include <linux/vmstat.h>
15#include <linux/atomic.h>
16#include <linux/vmalloc.h>
17#ifdef CONFIG_CMA
18#include <linux/cma.h>
19#endif
20#include <linux/zswap.h>
21#include <asm/page.h>
22#include "internal.h"
23
24void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
25{
26}
27
28static void show_val_kb(struct seq_file *m, const char *s, unsigned long num)
29{
30 seq_put_decimal_ull_width(m, delimiter: s, num: num << (PAGE_SHIFT - 10), width: 8);
31 seq_write(seq: m, data: " kB\n", len: 4);
32}
33
34static int meminfo_proc_show(struct seq_file *m, void *v)
35{
36 struct sysinfo i;
37 unsigned long committed;
38 long cached;
39 long available;
40 unsigned long pages[NR_LRU_LISTS];
41 unsigned long sreclaimable, sunreclaim;
42 int lru;
43
44 si_meminfo(val: &i);
45 si_swapinfo(&i);
46 committed = vm_memory_committed();
47
48 cached = global_node_page_state(item: NR_FILE_PAGES) -
49 total_swapcache_pages() - i.bufferram;
50 if (cached < 0)
51 cached = 0;
52
53 for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
54 pages[lru] = global_node_page_state(item: NR_LRU_BASE + lru);
55
56 available = si_mem_available();
57 sreclaimable = global_node_page_state_pages(item: NR_SLAB_RECLAIMABLE_B);
58 sunreclaim = global_node_page_state_pages(item: NR_SLAB_UNRECLAIMABLE_B);
59
60 show_val_kb(m, s: "MemTotal: ", num: i.totalram);
61 show_val_kb(m, s: "MemFree: ", num: i.freeram);
62 show_val_kb(m, s: "MemAvailable: ", num: available);
63 show_val_kb(m, s: "Buffers: ", num: i.bufferram);
64 show_val_kb(m, s: "Cached: ", num: cached);
65 show_val_kb(m, s: "SwapCached: ", num: total_swapcache_pages());
66 show_val_kb(m, s: "Active: ", num: pages[LRU_ACTIVE_ANON] +
67 pages[LRU_ACTIVE_FILE]);
68 show_val_kb(m, s: "Inactive: ", num: pages[LRU_INACTIVE_ANON] +
69 pages[LRU_INACTIVE_FILE]);
70 show_val_kb(m, s: "Active(anon): ", num: pages[LRU_ACTIVE_ANON]);
71 show_val_kb(m, s: "Inactive(anon): ", num: pages[LRU_INACTIVE_ANON]);
72 show_val_kb(m, s: "Active(file): ", num: pages[LRU_ACTIVE_FILE]);
73 show_val_kb(m, s: "Inactive(file): ", num: pages[LRU_INACTIVE_FILE]);
74 show_val_kb(m, s: "Unevictable: ", num: pages[LRU_UNEVICTABLE]);
75 show_val_kb(m, s: "Mlocked: ", num: global_zone_page_state(item: NR_MLOCK));
76
77#ifdef CONFIG_HIGHMEM
78 show_val_kb(m, "HighTotal: ", i.totalhigh);
79 show_val_kb(m, "HighFree: ", i.freehigh);
80 show_val_kb(m, "LowTotal: ", i.totalram - i.totalhigh);
81 show_val_kb(m, "LowFree: ", i.freeram - i.freehigh);
82#endif
83
84#ifndef CONFIG_MMU
85 show_val_kb(m, "MmapCopy: ",
86 (unsigned long)atomic_long_read(&mmap_pages_allocated));
87#endif
88
89 show_val_kb(m, s: "SwapTotal: ", num: i.totalswap);
90 show_val_kb(m, s: "SwapFree: ", num: i.freeswap);
91#ifdef CONFIG_ZSWAP
92 show_val_kb(m, s: "Zswap: ", num: zswap_total_pages());
93 seq_printf(m, fmt: "Zswapped: %8lu kB\n",
94 (unsigned long)atomic_long_read(v: &zswap_stored_pages) <<
95 (PAGE_SHIFT - 10));
96#endif
97 show_val_kb(m, s: "Dirty: ",
98 num: global_node_page_state(item: NR_FILE_DIRTY));
99 show_val_kb(m, s: "Writeback: ",
100 num: global_node_page_state(item: NR_WRITEBACK));
101 show_val_kb(m, s: "AnonPages: ",
102 num: global_node_page_state(item: NR_ANON_MAPPED));
103 show_val_kb(m, s: "Mapped: ",
104 num: global_node_page_state(item: NR_FILE_MAPPED));
105 show_val_kb(m, s: "Shmem: ", num: i.sharedram);
106 show_val_kb(m, s: "KReclaimable: ", num: sreclaimable +
107 global_node_page_state(item: NR_KERNEL_MISC_RECLAIMABLE));
108 show_val_kb(m, s: "Slab: ", num: sreclaimable + sunreclaim);
109 show_val_kb(m, s: "SReclaimable: ", num: sreclaimable);
110 show_val_kb(m, s: "SUnreclaim: ", num: sunreclaim);
111 seq_printf(m, fmt: "KernelStack: %8lu kB\n",
112 global_node_page_state(item: NR_KERNEL_STACK_KB));
113#ifdef CONFIG_SHADOW_CALL_STACK
114 seq_printf(m, "ShadowCallStack:%8lu kB\n",
115 global_node_page_state(NR_KERNEL_SCS_KB));
116#endif
117 show_val_kb(m, s: "PageTables: ",
118 num: global_node_page_state(item: NR_PAGETABLE));
119 show_val_kb(m, s: "SecPageTables: ",
120 num: global_node_page_state(item: NR_SECONDARY_PAGETABLE));
121
122 show_val_kb(m, s: "NFS_Unstable: ", num: 0);
123 show_val_kb(m, s: "Bounce: ", num: 0);
124 show_val_kb(m, s: "WritebackTmp: ",
125 num: global_node_page_state(item: NR_WRITEBACK_TEMP));
126 show_val_kb(m, s: "CommitLimit: ", num: vm_commit_limit());
127 show_val_kb(m, s: "Committed_AS: ", num: committed);
128 seq_printf(m, fmt: "VmallocTotal: %8lu kB\n",
129 (unsigned long)VMALLOC_TOTAL >> 10);
130 show_val_kb(m, s: "VmallocUsed: ", num: vmalloc_nr_pages());
131 show_val_kb(m, s: "VmallocChunk: ", num: 0ul);
132 show_val_kb(m, s: "Percpu: ", num: pcpu_nr_pages());
133
134 memtest_report_meminfo(m);
135
136#ifdef CONFIG_MEMORY_FAILURE
137 seq_printf(m, fmt: "HardwareCorrupted: %5lu kB\n",
138 atomic_long_read(v: &num_poisoned_pages) << (PAGE_SHIFT - 10));
139#endif
140
141#ifdef CONFIG_TRANSPARENT_HUGEPAGE
142 show_val_kb(m, s: "AnonHugePages: ",
143 num: global_node_page_state(item: NR_ANON_THPS));
144 show_val_kb(m, s: "ShmemHugePages: ",
145 num: global_node_page_state(item: NR_SHMEM_THPS));
146 show_val_kb(m, s: "ShmemPmdMapped: ",
147 num: global_node_page_state(item: NR_SHMEM_PMDMAPPED));
148 show_val_kb(m, s: "FileHugePages: ",
149 num: global_node_page_state(item: NR_FILE_THPS));
150 show_val_kb(m, s: "FilePmdMapped: ",
151 num: global_node_page_state(item: NR_FILE_PMDMAPPED));
152#endif
153
154#ifdef CONFIG_CMA
155 show_val_kb(m, s: "CmaTotal: ", num: totalcma_pages);
156 show_val_kb(m, s: "CmaFree: ",
157 num: global_zone_page_state(item: NR_FREE_CMA_PAGES));
158#endif
159
160#ifdef CONFIG_UNACCEPTED_MEMORY
161 show_val_kb(m, s: "Unaccepted: ",
162 num: global_zone_page_state(item: NR_UNACCEPTED));
163#endif
164 show_val_kb(m, s: "Balloon: ",
165 num: global_node_page_state(item: NR_BALLOON_PAGES));
166
167 hugetlb_report_meminfo(m);
168
169 arch_report_meminfo(m);
170
171 return 0;
172}
173
174static int __init proc_meminfo_init(void)
175{
176 struct proc_dir_entry *pde;
177
178 pde = proc_create_single("meminfo", 0, NULL, meminfo_proc_show);
179 pde_make_permanent(pde);
180 return 0;
181}
182fs_initcall(proc_meminfo_init);
183

source code of linux/fs/proc/meminfo.c