fs/proc/meminfo.c

   1 #include <linux/fs.h>
   2 #include <linux/hugetlb.h>
   3 #include <linux/init.h>
   4 #include <linux/kernel.h>
   5 #include <linux/mm.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 <asm/atomic.h>
  14 #include <asm/page.h>
  15 #include <asm/pgtable.h>
  16 #include "internal.h"
  17
  18 void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
  19 {
  20 }
  21
  22 static int meminfo_proc_show(struct seq_file *m, void *v)
  23 {
  24         struct sysinfo i;
  25         unsigned long committed;
  26         unsigned long allowed;
  27         struct vmalloc_info vmi;
  28         long cached;
  29         unsigned long pages[NR_LRU_LISTS];
  30         int lru;
  31
  32 /*
  33  * display in kilobytes.
  34  */
  35 #define K(x) ((x) << (PAGE_SHIFT - 10))
  36         si_meminfo(&i);
  37         si_swapinfo(&i);
  38         committed = percpu_counter_read_positive(&vm_committed_as);
  39         allowed = ((totalram_pages - hugetlb_total_pages())
  40                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
  41
  42         cached = global_page_state(NR_FILE_PAGES) -
  43                         total_swapcache_pages - i.bufferram;
  44         if (cached < 0)
  45                 cached = 0;
  46
  47         get_vmalloc_info(&vmi);
  48
  49         for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
  50                 pages[lru] = global_page_state(NR_LRU_BASE + lru);
  51
  52         /*
  53          * Tagged format, for easy grepping and expansion.
  54          */
  55         seq_printf(m,
  56                 "MemTotal:       %8lu kB\n"
  57                 "MemFree:        %8lu kB\n"
  58                 "Buffers:        %8lu kB\n"
  59                 "Cached:         %8lu kB\n"
  60                 "SwapCached:     %8lu kB\n"
  61                 "Active:         %8lu kB\n"
  62                 "Inactive:       %8lu kB\n"
  63                 "Active(anon):   %8lu kB\n"
  64                 "Inactive(anon): %8lu kB\n"
  65                 "Active(file):   %8lu kB\n"
  66                 "Inactive(file): %8lu kB\n"
  67 #ifdef CONFIG_UNEVICTABLE_LRU
  68                 "Unevictable:    %8lu kB\n"
  69                 "Mlocked:        %8lu kB\n"
  70 #endif
  71 #ifdef CONFIG_HIGHMEM
  72                 "HighTotal:      %8lu kB\n"
  73                 "HighFree:       %8lu kB\n"
  74                 "LowTotal:       %8lu kB\n"
  75                 "LowFree:        %8lu kB\n"
  76 #endif
  77 #ifndef CONFIG_MMU
  78                 "MmapCopy:       %8lu kB\n"
  79 #endif
  80                 "SwapTotal:      %8lu kB\n"
  81                 "SwapFree:       %8lu kB\n"
  82                 "Dirty:          %8lu kB\n"
  83                 "Writeback:      %8lu kB\n"
  84                 "AnonPages:      %8lu kB\n"
  85                 "Mapped:         %8lu kB\n"
  86                 "Slab:           %8lu kB\n"
  87                 "SReclaimable:   %8lu kB\n"
  88                 "SUnreclaim:     %8lu kB\n"
  89                 "PageTables:     %8lu kB\n"
  90 #ifdef CONFIG_QUICKLIST
  91                 "Quicklists:     %8lu kB\n"
  92 #endif
  93                 "NFS_Unstable:   %8lu kB\n"
  94                 "Bounce:         %8lu kB\n"
  95                 "WritebackTmp:   %8lu kB\n"
  96                 "CommitLimit:    %8lu kB\n"
  97                 "Committed_AS:   %8lu kB\n"
  98                 "VmallocTotal:   %8lu kB\n"
  99                 "VmallocUsed:    %8lu kB\n"
 100                 "VmallocChunk:   %8lu kB\n",
 101                 K(i.totalram),
 102                 K(i.freeram),
 103                 K(i.bufferram),
 104                 K(cached),
 105                 K(total_swapcache_pages),
 106                 K(pages[LRU_ACTIVE_ANON]   + pages[LRU_ACTIVE_FILE]),
 107                 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
 108                 K(pages[LRU_ACTIVE_ANON]),
 109                 K(pages[LRU_INACTIVE_ANON]),
 110                 K(pages[LRU_ACTIVE_FILE]),
 111                 K(pages[LRU_INACTIVE_FILE]),
 112 #ifdef CONFIG_UNEVICTABLE_LRU
 113                 K(pages[LRU_UNEVICTABLE]),
 114                 K(global_page_state(NR_MLOCK)),
 115 #endif
 116 #ifdef CONFIG_HIGHMEM
 117                 K(i.totalhigh),
 118                 K(i.freehigh),
 119                 K(i.totalram-i.totalhigh),
 120                 K(i.freeram-i.freehigh),
 121 #endif
 122 #ifndef CONFIG_MMU
 123                 K((unsigned long) atomic_read(&mmap_pages_allocated)),
 124 #endif
 125                 K(i.totalswap),
 126                 K(i.freeswap),
 127                 K(global_page_state(NR_FILE_DIRTY)),
 128                 K(global_page_state(NR_WRITEBACK)),
 129                 K(global_page_state(NR_ANON_PAGES)),
 130                 K(global_page_state(NR_FILE_MAPPED)),
 131                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 132                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 133                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 134                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 135                 K(global_page_state(NR_PAGETABLE)),
 136 #ifdef CONFIG_QUICKLIST
 137                 K(quicklist_total_size()),
 138 #endif
 139                 K(global_page_state(NR_UNSTABLE_NFS)),
 140                 K(global_page_state(NR_BOUNCE)),
 141                 K(global_page_state(NR_WRITEBACK_TEMP)),
 142                 K(allowed),
 143                 K(committed),
 144                 (unsigned long)VMALLOC_TOTAL >> 10,
 145                 vmi.used >> 10,
 146                 vmi.largest_chunk >> 10
 147                 );
 148
 149         hugetlb_report_meminfo(m);
 150
 151         arch_report_meminfo(m);
 152
 153         return 0;
 154 #undef K
 155 }
 156
 157 static int meminfo_proc_open(struct inode *inode, struct file *file)
 158 {
 159         return single_open(file, meminfo_proc_show, NULL);
 160 }
 161
 162 static const struct file_operations meminfo_proc_fops = {
 163         .open           = meminfo_proc_open,
 164         .read           = seq_read,
 165         .llseek         = seq_lseek,
 166         .release        = single_release,
 167 };
 168
 169 static int __init proc_meminfo_init(void)
 170 {
 171         proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
 172         return 0;
 173 }
 174 module_init(proc_meminfo_init);