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 pagecache;
  33         unsigned long wmark_low = 0;
  34         unsigned long pages[NR_LRU_LISTS];
  35         struct zone *zone;
  36         int lru;
  37
  38 /*
  39  * display in kilobytes.
  40  */
  41 #define K(x) ((x) << (PAGE_SHIFT - 10))
  42         si_meminfo(&i);
  43         si_swapinfo(&i);
  44         committed = percpu_counter_read_positive(&vm_committed_as);
  45
  46         cached = global_page_state(NR_FILE_PAGES) -
  47                         total_swapcache_pages() - i.bufferram;
  48         if (cached < 0)
  49                 cached = 0;
  50
  51         for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
  52                 pages[lru] = global_page_state(NR_LRU_BASE + lru);
  53
  54         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         available = i.freeram - totalreserve_pages;
  62
  63         /*
  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.
  67          */
  68         pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE];
  69         pagecache -= min(pagecache / 2, wmark_low);
  70         available += pagecache;
  71
  72         /*
  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.
  75          */
  76         available += global_page_state(NR_SLAB_RECLAIMABLE) -
  77                      min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low);
  78
  79         if (available < 0)
  80                 available = 0;
  81
  82         /*
  83          * Tagged format, for easy grepping and expansion.
  84          */
  85         seq_printf(m,
  86                 "MemTotal:       %8lu kB\n"
  87                 "MemFree:        %8lu kB\n"
  88                 "MemAvailable:   %8lu kB\n"
  89                 "Buffers:        %8lu kB\n"
  90                 "Cached:         %8lu kB\n"
  91                 "SwapCached:     %8lu kB\n"
  92                 "Active:         %8lu kB\n"
  93                 "Inactive:       %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"
  99                 "Mlocked:        %8lu kB\n"
 100 #ifdef CONFIG_HIGHMEM
 101                 "HighTotal:      %8lu kB\n"
 102                 "HighFree:       %8lu kB\n"
 103                 "LowTotal:       %8lu kB\n"
 104                 "LowFree:        %8lu kB\n"
 105 #endif
 106 #ifndef CONFIG_MMU
 107                 "MmapCopy:       %8lu kB\n"
 108 #endif
 109                 "SwapTotal:      %8lu kB\n"
 110                 "SwapFree:       %8lu kB\n"
 111                 "Dirty:          %8lu kB\n"
 112                 "Writeback:      %8lu kB\n"
 113                 "AnonPages:      %8lu kB\n"
 114                 "Mapped:         %8lu kB\n"
 115                 "Shmem:          %8lu kB\n"
 116                 "Slab:           %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"
 123 #endif
 124                 "NFS_Unstable:   %8lu kB\n"
 125                 "Bounce:         %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"
 134 #endif
 135 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 136                 "AnonHugePages:  %8lu kB\n"
 137 #endif
 138 #ifdef CONFIG_CMA
 139                 "CmaTotal:       %8lu kB\n"
 140                 "CmaFree:        %8lu kB\n"
 141 #endif
 142                 ,
 143                 K(i.totalram),
 144                 K(i.freeram),
 145                 K(available),
 146                 K(i.bufferram),
 147                 K(cached),
 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
 158                 K(i.totalhigh),
 159                 K(i.freehigh),
 160                 K(i.totalram-i.totalhigh),
 161                 K(i.freeram-i.freehigh),
 162 #endif
 163 #ifndef CONFIG_MMU
 164                 K((unsigned long) atomic_long_read(&mmap_pages_allocated)),
 165 #endif
 166                 K(i.totalswap),
 167                 K(i.freeswap),
 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)),
 172                 K(i.sharedram),
 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()),
 181 #endif
 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()),
 186                 K(committed),
 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)
 192 #endif
 193 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 194                 , K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
 195                    HPAGE_PMD_NR)
 196 #endif
 197 #ifdef CONFIG_CMA
 198                 , K(totalcma_pages)
 199                 , K(global_page_state(NR_FREE_CMA_PAGES))
 200 #endif
 201                 );
 202
 203         hugetlb_report_meminfo(m);
 204
 205         arch_report_meminfo(m);
 206
 207         return 0;
 208 #undef K
 209 }
 210
 211 static int meminfo_proc_open(struct inode *inode, struct file *file)
 212 {
 213         return single_open(file, meminfo_proc_show, NULL);
 214 }
 215
 216 static const struct file_operations meminfo_proc_fops = {
 217         .open           = meminfo_proc_open,
 218         .read           = seq_read,
 219         .llseek         = seq_lseek,
 220         .release        = single_release,
 221 };
 222
 223 static int __init proc_meminfo_init(void)
 224 {
 225         proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
 226         return 0;
 227 }
 228 fs_initcall(proc_meminfo_init);