2 #include <linux/init.h>
3 #include <linux/kernel.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>
16 #include <linux/cma.h>
19 #include <asm/pgtable.h>
22 void __attribute__((weak
)) arch_report_meminfo(struct seq_file
*m
)
26 static int meminfo_proc_show(struct seq_file
*m
, void *v
)
29 unsigned long committed
;
32 unsigned long pagecache
;
33 unsigned long wmark_low
= 0;
34 unsigned long pages
[NR_LRU_LISTS
];
39 * display in kilobytes.
41 #define K(x) ((x) << (PAGE_SHIFT - 10))
44 committed
= percpu_counter_read_positive(&vm_committed_as
);
46 cached
= global_page_state(NR_FILE_PAGES
) -
47 total_swapcache_pages() - i
.bufferram
;
51 for (lru
= LRU_BASE
; lru
< NR_LRU_LISTS
; lru
++)
52 pages
[lru
] = global_page_state(NR_LRU_BASE
+ lru
);
55 wmark_low
+= zone
->watermark
[WMARK_LOW
];
58 * Estimate the amount of memory available for userspace allocations,
59 * without causing swapping.
61 available
= i
.freeram
- totalreserve_pages
;
64 * Not all the page cache can be freed, otherwise the system will
65 * start swapping. Assume at least half of the page cache, or the
66 * low watermark worth of cache, needs to stay.
68 pagecache
= pages
[LRU_ACTIVE_FILE
] + pages
[LRU_INACTIVE_FILE
];
69 pagecache
-= min(pagecache
/ 2, wmark_low
);
70 available
+= pagecache
;
73 * Part of the reclaimable slab consists of items that are in use,
74 * and cannot be freed. Cap this estimate at the low watermark.
76 available
+= global_page_state(NR_SLAB_RECLAIMABLE
) -
77 min(global_page_state(NR_SLAB_RECLAIMABLE
) / 2, wmark_low
);
83 * Tagged format, for easy grepping and expansion.
88 "MemAvailable: %8lu kB\n"
91 "SwapCached: %8lu kB\n"
94 "Active(anon): %8lu kB\n"
95 "Inactive(anon): %8lu kB\n"
96 "Active(file): %8lu kB\n"
97 "Inactive(file): %8lu kB\n"
98 "Unevictable: %8lu kB\n"
100 #ifdef CONFIG_HIGHMEM
101 "HighTotal: %8lu kB\n"
102 "HighFree: %8lu kB\n"
103 "LowTotal: %8lu kB\n"
107 "MmapCopy: %8lu kB\n"
109 "SwapTotal: %8lu kB\n"
110 "SwapFree: %8lu kB\n"
112 "Writeback: %8lu kB\n"
113 "AnonPages: %8lu kB\n"
117 "SReclaimable: %8lu kB\n"
118 "SUnreclaim: %8lu kB\n"
119 "KernelStack: %8lu kB\n"
120 "PageTables: %8lu kB\n"
121 #ifdef CONFIG_QUICKLIST
122 "Quicklists: %8lu kB\n"
124 "NFS_Unstable: %8lu kB\n"
126 "WritebackTmp: %8lu kB\n"
127 "CommitLimit: %8lu kB\n"
128 "Committed_AS: %8lu kB\n"
129 "VmallocTotal: %8lu kB\n"
130 "VmallocUsed: %8lu kB\n"
131 "VmallocChunk: %8lu kB\n"
132 #ifdef CONFIG_MEMORY_FAILURE
133 "HardwareCorrupted: %5lu kB\n"
135 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
136 "AnonHugePages: %8lu kB\n"
139 "CmaTotal: %8lu kB\n"
148 K(total_swapcache_pages()),
149 K(pages
[LRU_ACTIVE_ANON
] + pages
[LRU_ACTIVE_FILE
]),
150 K(pages
[LRU_INACTIVE_ANON
] + pages
[LRU_INACTIVE_FILE
]),
151 K(pages
[LRU_ACTIVE_ANON
]),
152 K(pages
[LRU_INACTIVE_ANON
]),
153 K(pages
[LRU_ACTIVE_FILE
]),
154 K(pages
[LRU_INACTIVE_FILE
]),
155 K(pages
[LRU_UNEVICTABLE
]),
156 K(global_page_state(NR_MLOCK
)),
157 #ifdef CONFIG_HIGHMEM
160 K(i
.totalram
-i
.totalhigh
),
161 K(i
.freeram
-i
.freehigh
),
164 K((unsigned long) atomic_long_read(&mmap_pages_allocated
)),
168 K(global_page_state(NR_FILE_DIRTY
)),
169 K(global_page_state(NR_WRITEBACK
)),
170 K(global_page_state(NR_ANON_PAGES
)),
171 K(global_page_state(NR_FILE_MAPPED
)),
173 K(global_page_state(NR_SLAB_RECLAIMABLE
) +
174 global_page_state(NR_SLAB_UNRECLAIMABLE
)),
175 K(global_page_state(NR_SLAB_RECLAIMABLE
)),
176 K(global_page_state(NR_SLAB_UNRECLAIMABLE
)),
177 global_page_state(NR_KERNEL_STACK
) * THREAD_SIZE
/ 1024,
178 K(global_page_state(NR_PAGETABLE
)),
179 #ifdef CONFIG_QUICKLIST
180 K(quicklist_total_size()),
182 K(global_page_state(NR_UNSTABLE_NFS
)),
183 K(global_page_state(NR_BOUNCE
)),
184 K(global_page_state(NR_WRITEBACK_TEMP
)),
185 K(vm_commit_limit()),
187 (unsigned long)VMALLOC_TOTAL
>> 10,
188 0ul, // used to be vmalloc 'used'
189 0ul // used to be vmalloc 'largest_chunk'
190 #ifdef CONFIG_MEMORY_FAILURE
191 , atomic_long_read(&num_poisoned_pages
) << (PAGE_SHIFT
- 10)
193 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
194 , K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES
) *
199 , K(global_page_state(NR_FREE_CMA_PAGES
))
203 hugetlb_report_meminfo(m
);
205 arch_report_meminfo(m
);
211 static int meminfo_proc_open(struct inode
*inode
, struct file
*file
)
213 return single_open(file
, meminfo_proc_show
, NULL
);
216 static const struct file_operations meminfo_proc_fops
= {
217 .open
= meminfo_proc_open
,
220 .release
= single_release
,
223 static int __init
proc_meminfo_init(void)
225 proc_create("meminfo", 0, NULL
, &meminfo_proc_fops
);
228 fs_initcall(proc_meminfo_init
);