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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/quicklist.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 <asm/pgtable.h>
21#include "internal.h"
22
23void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
24{
25}
26
27static void show_val_kb(struct seq_file *m, const char *s, unsigned long num)
28{
29 seq_put_decimal_ull_width(m, s, num << (PAGE_SHIFT - 10), 8);
30 seq_write(m, " kB\n", 4);
31}
32
33static int meminfo_proc_show(struct seq_file *m, void *v)
34{
35 struct sysinfo i;
36 unsigned long committed;
37 long cached;
38 long available;
39 unsigned long pages[NR_LRU_LISTS];
40 int lru;
41
42 si_meminfo(&i);
43 si_swapinfo(&i);
44 committed = percpu_counter_read_positive(&vm_committed_as);
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
56 show_val_kb(m, "MemTotal: ", i.totalram);
57 show_val_kb(m, "MemFree: ", i.freeram);
58 show_val_kb(m, "MemAvailable: ", available);
59 show_val_kb(m, "Buffers: ", i.bufferram);
60 show_val_kb(m, "Cached: ", cached);
61 show_val_kb(m, "SwapCached: ", total_swapcache_pages());
62 show_val_kb(m, "Active: ", pages[LRU_ACTIVE_ANON] +
63 pages[LRU_ACTIVE_FILE]);
64 show_val_kb(m, "Inactive: ", pages[LRU_INACTIVE_ANON] +
65 pages[LRU_INACTIVE_FILE]);
66 show_val_kb(m, "Active(anon): ", pages[LRU_ACTIVE_ANON]);
67 show_val_kb(m, "Inactive(anon): ", pages[LRU_INACTIVE_ANON]);
68 show_val_kb(m, "Active(file): ", pages[LRU_ACTIVE_FILE]);
69 show_val_kb(m, "Inactive(file): ", pages[LRU_INACTIVE_FILE]);
70 show_val_kb(m, "Unevictable: ", pages[LRU_UNEVICTABLE]);
71 show_val_kb(m, "Mlocked: ", global_zone_page_state(NR_MLOCK));
72
73#ifdef CONFIG_HIGHMEM
74 show_val_kb(m, "HighTotal: ", i.totalhigh);
75 show_val_kb(m, "HighFree: ", i.freehigh);
76 show_val_kb(m, "LowTotal: ", i.totalram - i.totalhigh);
77 show_val_kb(m, "LowFree: ", i.freeram - i.freehigh);
78#endif
79
80#ifndef CONFIG_MMU
81 show_val_kb(m, "MmapCopy: ",
82 (unsigned long)atomic_long_read(&mmap_pages_allocated));
83#endif
84
85 show_val_kb(m, "SwapTotal: ", i.totalswap);
86 show_val_kb(m, "SwapFree: ", i.freeswap);
87 show_val_kb(m, "Dirty: ",
88 global_node_page_state(NR_FILE_DIRTY));
89 show_val_kb(m, "Writeback: ",
90 global_node_page_state(NR_WRITEBACK));
91 show_val_kb(m, "AnonPages: ",
92 global_node_page_state(NR_ANON_MAPPED));
93 show_val_kb(m, "Mapped: ",
94 global_node_page_state(NR_FILE_MAPPED));
95 show_val_kb(m, "Shmem: ", i.sharedram);
96 show_val_kb(m, "Slab: ",
97 global_node_page_state(NR_SLAB_RECLAIMABLE) +
98 global_node_page_state(NR_SLAB_UNRECLAIMABLE));
99
100 show_val_kb(m, "SReclaimable: ",
101 global_node_page_state(NR_SLAB_RECLAIMABLE));
102 show_val_kb(m, "SUnreclaim: ",
103 global_node_page_state(NR_SLAB_UNRECLAIMABLE));
104 seq_printf(m, "KernelStack: %8lu kB\n",
105 global_zone_page_state(NR_KERNEL_STACK_KB));
106 show_val_kb(m, "PageTables: ",
107 global_zone_page_state(NR_PAGETABLE));
108#ifdef CONFIG_QUICKLIST
109 show_val_kb(m, "Quicklists: ", quicklist_total_size());
110#endif
111
112 show_val_kb(m, "NFS_Unstable: ",
113 global_node_page_state(NR_UNSTABLE_NFS));
114 show_val_kb(m, "Bounce: ",
115 global_zone_page_state(NR_BOUNCE));
116 show_val_kb(m, "WritebackTmp: ",
117 global_node_page_state(NR_WRITEBACK_TEMP));
118 show_val_kb(m, "CommitLimit: ", vm_commit_limit());
119 show_val_kb(m, "Committed_AS: ", committed);
120 seq_printf(m, "VmallocTotal: %8lu kB\n",
121 (unsigned long)VMALLOC_TOTAL >> 10);
122 show_val_kb(m, "VmallocUsed: ", 0ul);
123 show_val_kb(m, "VmallocChunk: ", 0ul);
124
125#ifdef CONFIG_MEMORY_FAILURE
126 seq_printf(m, "HardwareCorrupted: %5lu kB\n",
127 atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10));
128#endif
129
130#ifdef CONFIG_TRANSPARENT_HUGEPAGE
131 show_val_kb(m, "AnonHugePages: ",
132 global_node_page_state(NR_ANON_THPS) * HPAGE_PMD_NR);
133 show_val_kb(m, "ShmemHugePages: ",
134 global_node_page_state(NR_SHMEM_THPS) * HPAGE_PMD_NR);
135 show_val_kb(m, "ShmemPmdMapped: ",
136 global_node_page_state(NR_SHMEM_PMDMAPPED) * HPAGE_PMD_NR);
137#endif
138
139#ifdef CONFIG_CMA
140 show_val_kb(m, "CmaTotal: ", totalcma_pages);
141 show_val_kb(m, "CmaFree: ",
142 global_zone_page_state(NR_FREE_CMA_PAGES));
143#endif
144
145 hugetlb_report_meminfo(m);
146
147 arch_report_meminfo(m);
148
149 return 0;
150}
151
152static int meminfo_proc_open(struct inode *inode, struct file *file)
153{
154 return single_open(file, meminfo_proc_show, NULL);
155}
156
157static const struct file_operations meminfo_proc_fops = {
158 .open = meminfo_proc_open,
159 .read = seq_read,
160 .llseek = seq_lseek,
161 .release = single_release,
162};
163
164static int __init proc_meminfo_init(void)
165{
166 proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
167 return 0;
168}
169fs_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);