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Alexey Dobriyane1759c22008-10-15 23:50:22 +04001#include <linux/fs.h>
Alexey Dobriyane1759c22008-10-15 23:50:22 +04002#include <linux/init.h>
3#include <linux/kernel.h>
4#include <linux/mm.h>
Kirill A. Shutemovcb900f42013-11-14 14:31:02 -08005#include <linux/hugetlb.h>
Alexey Dobriyane1759c22008-10-15 23:50:22 +04006#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>
Arun Sharma600634972011-07-26 16:09:06 -070013#include <linux/atomic.h>
Joonsoo Kimdb3808c2013-04-29 15:07:28 -070014#include <linux/vmalloc.h>
Alexey Dobriyane1759c22008-10-15 23:50:22 +040015#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;
Alexey Dobriyane1759c22008-10-15 23:50:22 +040027 struct vmalloc_info vmi;
28 long cached;
Rik van Riel34e431b2014-01-21 15:49:05 -080029 long available;
30 unsigned long pagecache;
31 unsigned long wmark_low = 0;
Alexey Dobriyane1759c22008-10-15 23:50:22 +040032 unsigned long pages[NR_LRU_LISTS];
Rik van Riel34e431b2014-01-21 15:49:05 -080033 struct zone *zone;
Alexey Dobriyane1759c22008-10-15 23:50:22 +040034 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);
KOSAKI Motohiro00a62ce2009-04-30 15:08:51 -070042 committed = percpu_counter_read_positive(&vm_committed_as);
Alexey Dobriyane1759c22008-10-15 23:50:22 +040043
44 cached = global_page_state(NR_FILE_PAGES) -
Shaohua Li33806f02013-02-22 16:34:37 -080045 total_swapcache_pages() - i.bufferram;
Alexey Dobriyane1759c22008-10-15 23:50:22 +040046 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
Rik van Riel34e431b2014-01-21 15:49:05 -080054 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 /*
Luiz Capitulinof0b56642014-04-07 15:38:32 -070076 * Part of the reclaimable slab consists of items that are in use,
Rik van Riel34e431b2014-01-21 15:49:05 -080077 * 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
Alexey Dobriyane1759c22008-10-15 23:50:22 +040085 /*
86 * Tagged format, for easy grepping and expansion.
87 */
88 seq_printf(m,
89 "MemTotal: %8lu kB\n"
90 "MemFree: %8lu kB\n"
Rik van Riel34e431b2014-01-21 15:49:05 -080091 "MemAvailable: %8lu kB\n"
Alexey Dobriyane1759c22008-10-15 23:50:22 +040092 "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"
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400101 "Unevictable: %8lu kB\n"
102 "Mlocked: %8lu kB\n"
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400103#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
David Howells8feae132009-01-08 12:04:47 +0000109#ifndef CONFIG_MMU
110 "MmapCopy: %8lu kB\n"
111#endif
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400112 "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"
KOSAKI Motohiro4b021082009-09-21 17:01:33 -0700118 "Shmem: %8lu kB\n"
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400119 "Slab: %8lu kB\n"
120 "SReclaimable: %8lu kB\n"
121 "SUnreclaim: %8lu kB\n"
KOSAKI Motohiroc6a7f572009-09-21 17:01:32 -0700122 "KernelStack: %8lu kB\n"
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400123 "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"
Andi Kleen6a460792009-09-16 11:50:15 +0200134 "VmallocChunk: %8lu kB\n"
135#ifdef CONFIG_MEMORY_FAILURE
Hugh Dickins370c28d2009-10-26 16:49:32 -0700136 "HardwareCorrupted: %5lu kB\n"
Andi Kleen6a460792009-09-16 11:50:15 +0200137#endif
Andrea Arcangeli79134172011-01-13 15:46:58 -0800138#ifdef CONFIG_TRANSPARENT_HUGEPAGE
139 "AnonHugePages: %8lu kB\n"
140#endif
Andi Kleen6a460792009-09-16 11:50:15 +0200141 ,
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400142 K(i.totalram),
143 K(i.freeram),
Rik van Riel34e431b2014-01-21 15:49:05 -0800144 K(available),
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400145 K(i.bufferram),
146 K(cached),
Shaohua Li33806f02013-02-22 16:34:37 -0800147 K(total_swapcache_pages()),
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400148 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]),
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400154 K(pages[LRU_UNEVICTABLE]),
155 K(global_page_state(NR_MLOCK)),
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400156#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
David Howells8feae132009-01-08 12:04:47 +0000162#ifndef CONFIG_MMU
David Howells33e5d7692009-04-02 16:56:32 -0700163 K((unsigned long) atomic_long_read(&mmap_pages_allocated)),
David Howells8feae132009-01-08 12:04:47 +0000164#endif
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400165 K(i.totalswap),
166 K(i.freeswap),
167 K(global_page_state(NR_FILE_DIRTY)),
168 K(global_page_state(NR_WRITEBACK)),
Claudio Scordinob53fc7c2011-12-08 14:33:56 -0800169 K(global_page_state(NR_ANON_PAGES)),
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400170 K(global_page_state(NR_FILE_MAPPED)),
KOSAKI Motohiro4b021082009-09-21 17:01:33 -0700171 K(global_page_state(NR_SHMEM)),
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400172 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)),
KOSAKI Motohiroc6a7f572009-09-21 17:01:32 -0700176 global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024,
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400177 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)),
Jerome Marchand00619bc2013-11-12 15:08:31 -0800184 K(vm_commit_limit()),
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400185 K(committed),
186 (unsigned long)VMALLOC_TOTAL >> 10,
187 vmi.used >> 10,
188 vmi.largest_chunk >> 10
Andi Kleen6a460792009-09-16 11:50:15 +0200189#ifdef CONFIG_MEMORY_FAILURE
Xishi Qiu293c07e2013-02-22 16:34:02 -0800190 ,atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10)
Andi Kleen6a460792009-09-16 11:50:15 +0200191#endif
Andrea Arcangeli79134172011-01-13 15:46:58 -0800192#ifdef CONFIG_TRANSPARENT_HUGEPAGE
193 ,K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
194 HPAGE_PMD_NR)
195#endif
Alexey Dobriyane1759c22008-10-15 23:50:22 +0400196 );
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}
Paul Gortmakerabaf3782014-01-23 15:55:45 -0800223fs_initcall(proc_meminfo_init);