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 <asm/pgtable.h>
19 void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
23 static int meminfo_proc_show(struct seq_file *m, void *v)
26 unsigned long committed;
27 struct vmalloc_info vmi;
30 unsigned long pagecache;
31 unsigned long wmark_low = 0;
32 unsigned long pages[NR_LRU_LISTS];
37 * display in kilobytes.
39 #define K(x) ((x) << (PAGE_SHIFT - 10))
42 committed = percpu_counter_read_positive(&vm_committed_as);
44 cached = global_page_state(NR_FILE_PAGES) -
45 total_swapcache_pages() - i.bufferram;
49 get_vmalloc_info(&vmi);
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 * Free memory cannot be taken below the low watermark, before the
62 * system starts swapping.
64 available = i.freeram - wmark_low;
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.
71 pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE];
72 pagecache -= min(pagecache / 2, wmark_low);
73 available += pagecache;
76 * Part of the reclaimable swap consists of items that are in use,
77 * and cannot be freed. Cap this estimate at the low watermark.
79 available += global_page_state(NR_SLAB_RECLAIMABLE) -
80 min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low);
86 * Tagged format, for easy grepping and expansion.
91 "MemAvailable: %8lu kB\n"
94 "SwapCached: %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"
103 #ifdef CONFIG_HIGHMEM
104 "HighTotal: %8lu kB\n"
105 "HighFree: %8lu kB\n"
106 "LowTotal: %8lu kB\n"
110 "MmapCopy: %8lu kB\n"
112 "SwapTotal: %8lu kB\n"
113 "SwapFree: %8lu kB\n"
115 "Writeback: %8lu kB\n"
116 "AnonPages: %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"
127 "NFS_Unstable: %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"
138 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
139 "AnonHugePages: %8lu kB\n"
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
159 K(i.totalram-i.totalhigh),
160 K(i.freeram-i.freehigh),
163 K((unsigned long) atomic_long_read(&mmap_pages_allocated)),
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()),
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()),
186 (unsigned long)VMALLOC_TOTAL >> 10,
188 vmi.largest_chunk >> 10
189 #ifdef CONFIG_MEMORY_FAILURE
190 ,atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10)
192 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
193 ,K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
198 hugetlb_report_meminfo(m);
200 arch_report_meminfo(m);
206 static int meminfo_proc_open(struct inode *inode, struct file *file)
208 return single_open(file, meminfo_proc_show, NULL);
211 static const struct file_operations meminfo_proc_fops = {
212 .open = meminfo_proc_open,
215 .release = single_release,
218 static int __init proc_meminfo_init(void)
220 proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
223 fs_initcall(proc_meminfo_init);