fs/proc/meminfo.c

   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 #ifdef CONFIG_CMA
  16 #include <linux/cma.h>
  17 #endif
  18 #include <asm/page.h>
  19 #include <asm/pgtable.h>
  20 #include "internal.h"
  21
  22 void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
  23 {
  24 }
  25
  26 static int meminfo_proc_show(struct seq_file *m, void *v)
  27 {
  28         struct sysinfo i;
  29         unsigned long committed;
  30         long cached;
  31         long available;
  32         unsigned long pages[NR_LRU_LISTS];
  33         int lru;
  34
  35 /*
  36  * display in kilobytes.
  37  */
  38 #define K(x) ((x) << (PAGE_SHIFT - 10))
  39         si_meminfo(&i);
  40         si_swapinfo(&i);
  41         committed = percpu_counter_read_positive(&vm_committed_as);
  42
  43         cached = global_node_page_state(NR_FILE_PAGES) -
  44                         total_swapcache_pages() - i.bufferram;
  45         if (cached < 0)
  46                 cached = 0;
  47
  48         for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
  49                 pages[lru] = global_page_state(NR_LRU_BASE + lru);
  50
  51         available = si_mem_available();
  52
  53         /*
  54          * Tagged format, for easy grepping and expansion.
  55          */
  56         seq_printf(m,
  57                 "MemTotal:       %8lu kB\n"
  58                 "MemFree:        %8lu kB\n"
  59                 "MemAvailable:   %8lu kB\n"
  60                 "Buffers:        %8lu kB\n"
  61                 "Cached:         %8lu kB\n"
  62                 "SwapCached:     %8lu kB\n"
  63                 "Active:         %8lu kB\n"
  64                 "Inactive:       %8lu kB\n"
  65                 "Active(anon):   %8lu kB\n"
  66                 "Inactive(anon): %8lu kB\n"
  67                 "Active(file):   %8lu kB\n"
  68                 "Inactive(file): %8lu kB\n"
  69                 "Unevictable:    %8lu kB\n"
  70                 "Mlocked:        %8lu kB\n"
  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                 "Shmem:          %8lu kB\n"
  87                 "Slab:           %8lu kB\n"
  88                 "SReclaimable:   %8lu kB\n"
  89                 "SUnreclaim:     %8lu kB\n"
  90                 "KernelStack:    %8lu kB\n"
  91                 "PageTables:     %8lu kB\n"
  92 #ifdef CONFIG_QUICKLIST
  93                 "Quicklists:     %8lu kB\n"
  94 #endif
  95                 "NFS_Unstable:   %8lu kB\n"
  96                 "Bounce:         %8lu kB\n"
  97                 "WritebackTmp:   %8lu kB\n"
  98                 "CommitLimit:    %8lu kB\n"
  99                 "Committed_AS:   %8lu kB\n"
 100                 "VmallocTotal:   %8lu kB\n"
 101                 "VmallocUsed:    %8lu kB\n"
 102                 "VmallocChunk:   %8lu kB\n"
 103 #ifdef CONFIG_MEMORY_FAILURE
 104                 "HardwareCorrupted: %5lu kB\n"
 105 #endif
 106 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 107                 "AnonHugePages:  %8lu kB\n"
 108                 "ShmemHugePages: %8lu kB\n"
 109                 "ShmemPmdMapped: %8lu kB\n"
 110 #endif
 111 #ifdef CONFIG_CMA
 112                 "CmaTotal:       %8lu kB\n"
 113                 "CmaFree:        %8lu kB\n"
 114 #endif
 115                 ,
 116                 K(i.totalram),
 117                 K(i.freeram),
 118                 K(available),
 119                 K(i.bufferram),
 120                 K(cached),
 121                 K(total_swapcache_pages()),
 122                 K(pages[LRU_ACTIVE_ANON]   + pages[LRU_ACTIVE_FILE]),
 123                 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
 124                 K(pages[LRU_ACTIVE_ANON]),
 125                 K(pages[LRU_INACTIVE_ANON]),
 126                 K(pages[LRU_ACTIVE_FILE]),
 127                 K(pages[LRU_INACTIVE_FILE]),
 128                 K(pages[LRU_UNEVICTABLE]),
 129                 K(global_page_state(NR_MLOCK)),
 130 #ifdef CONFIG_HIGHMEM
 131                 K(i.totalhigh),
 132                 K(i.freehigh),
 133                 K(i.totalram-i.totalhigh),
 134                 K(i.freeram-i.freehigh),
 135 #endif
 136 #ifndef CONFIG_MMU
 137                 K((unsigned long) atomic_long_read(&mmap_pages_allocated)),
 138 #endif
 139                 K(i.totalswap),
 140                 K(i.freeswap),
 141                 K(global_node_page_state(NR_FILE_DIRTY)),
 142                 K(global_node_page_state(NR_WRITEBACK)),
 143                 K(global_node_page_state(NR_ANON_MAPPED)),
 144                 K(global_node_page_state(NR_FILE_MAPPED)),
 145                 K(i.sharedram),
 146                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 147                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 148                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 149                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 150                 global_page_state(NR_KERNEL_STACK_KB),
 151                 K(global_page_state(NR_PAGETABLE)),
 152 #ifdef CONFIG_QUICKLIST
 153                 K(quicklist_total_size()),
 154 #endif
 155                 K(global_node_page_state(NR_UNSTABLE_NFS)),
 156                 K(global_page_state(NR_BOUNCE)),
 157                 K(global_node_page_state(NR_WRITEBACK_TEMP)),
 158                 K(vm_commit_limit()),
 159                 K(committed),
 160                 (unsigned long)VMALLOC_TOTAL >> 10,
 161                 0ul, // used to be vmalloc 'used'
 162                 0ul  // used to be vmalloc 'largest_chunk'
 163 #ifdef CONFIG_MEMORY_FAILURE
 164                 , atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10)
 165 #endif
 166 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 167                 , K(global_node_page_state(NR_ANON_THPS) * HPAGE_PMD_NR)
 168                 , K(global_node_page_state(NR_SHMEM_THPS) * HPAGE_PMD_NR)
 169                 , K(global_node_page_state(NR_SHMEM_PMDMAPPED) * HPAGE_PMD_NR)
 170 #endif
 171 #ifdef CONFIG_CMA
 172                 , K(totalcma_pages)
 173                 , K(global_page_state(NR_FREE_CMA_PAGES))
 174 #endif
 175                 );
 176
 177         hugetlb_report_meminfo(m);
 178
 179         arch_report_meminfo(m);
 180
 181         return 0;
 182 #undef K
 183 }
 184
 185 static int meminfo_proc_open(struct inode *inode, struct file *file)
 186 {
 187         return single_open(file, meminfo_proc_show, NULL);
 188 }
 189
 190 static const struct file_operations meminfo_proc_fops = {
 191         .open           = meminfo_proc_open,
 192         .read           = seq_read,
 193         .llseek         = seq_lseek,
 194         .release        = single_release,
 195 };
 196
 197 static int __init proc_meminfo_init(void)
 198 {
 199         proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
 200         return 0;
 201 }
 202 fs_initcall(proc_meminfo_init);