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          * Free memory cannot be taken below the low watermark, before the
  62          * system starts swapping.
  63          */
  64         available = i.freeram - wmark_low;
  65
  66         /*
  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.
  70          */
  71         pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE];
  72         pagecache -= min(pagecache / 2, wmark_low);
  73         available += pagecache;
  74
  75         /*
  76          * Part of the reclaimable slab consists of items that are in use,
  77          * and cannot be freed. Cap this estimate at the low watermark.
  78          */
  79         available += global_page_state(NR_SLAB_RECLAIMABLE) -
  80                      min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low);
  81
  82         if (available < 0)
  83                 available = 0;
  84
  85         /*
  86          * Tagged format, for easy grepping and expansion.
  87          */
  88         seq_printf(m,
  89                 "MemTotal:       %8lu kB\n"
  90                 "MemFree:        %8lu kB\n"
  91                 "MemAvailable:   %8lu kB\n"
  92                 "Buffers:        %8lu kB\n"
  93                 "Cached:         %8lu kB\n"
  94                 "SwapCached:     %8lu kB\n"
  95                 "Active:         %8lu kB\n"
  96                 "Inactive:       %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"
 102                 "Mlocked:        %8lu kB\n"
 103 #ifdef CONFIG_HIGHMEM
 104                 "HighTotal:      %8lu kB\n"
 105                 "HighFree:       %8lu kB\n"
 106                 "LowTotal:       %8lu kB\n"
 107                 "LowFree:        %8lu kB\n"
 108 #endif
 109 #ifndef CONFIG_MMU
 110                 "MmapCopy:       %8lu kB\n"
 111 #endif
 112                 "SwapTotal:      %8lu kB\n"
 113                 "SwapFree:       %8lu kB\n"
 114                 "Dirty:          %8lu kB\n"
 115                 "Writeback:      %8lu kB\n"
 116                 "AnonPages:      %8lu kB\n"
 117                 "Mapped:         %8lu kB\n"
 118                 "Shmem:          %8lu kB\n"
 119                 "Slab:           %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"
 126 #endif
 127                 "NFS_Unstable:   %8lu kB\n"
 128                 "Bounce:         %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"
 137 #endif
 138 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 139                 "AnonHugePages:  %8lu kB\n"
 140 #endif
 141 #ifdef CONFIG_CMA
 142                 "CmaTotal:       %8lu kB\n"
 143                 "CmaFree:        %8lu kB\n"
 144 #endif
 145                 ,
 146                 K(i.totalram),
 147                 K(i.freeram),
 148                 K(available),
 149                 K(i.bufferram),
 150                 K(cached),
 151                 K(total_swapcache_pages()),
 152                 K(pages[LRU_ACTIVE_ANON]   + pages[LRU_ACTIVE_FILE]),
 153                 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
 154                 K(pages[LRU_ACTIVE_ANON]),
 155                 K(pages[LRU_INACTIVE_ANON]),
 156                 K(pages[LRU_ACTIVE_FILE]),
 157                 K(pages[LRU_INACTIVE_FILE]),
 158                 K(pages[LRU_UNEVICTABLE]),
 159                 K(global_page_state(NR_MLOCK)),
 160 #ifdef CONFIG_HIGHMEM
 161                 K(i.totalhigh),
 162                 K(i.freehigh),
 163                 K(i.totalram-i.totalhigh),
 164                 K(i.freeram-i.freehigh),
 165 #endif
 166 #ifndef CONFIG_MMU
 167                 K((unsigned long) atomic_long_read(&mmap_pages_allocated)),
 168 #endif
 169                 K(i.totalswap),
 170                 K(i.freeswap),
 171                 K(global_page_state(NR_FILE_DIRTY)),
 172                 K(global_page_state(NR_WRITEBACK)),
 173                 K(global_page_state(NR_ANON_PAGES)),
 174                 K(global_page_state(NR_FILE_MAPPED)),
 175                 K(i.sharedram),
 176                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 177                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 178                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 179                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 180                 global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024,
 181                 K(global_page_state(NR_PAGETABLE)),
 182 #ifdef CONFIG_QUICKLIST
 183                 K(quicklist_total_size()),
 184 #endif
 185                 K(global_page_state(NR_UNSTABLE_NFS)),
 186                 K(global_page_state(NR_BOUNCE)),
 187                 K(global_page_state(NR_WRITEBACK_TEMP)),
 188                 K(vm_commit_limit()),
 189                 K(committed),
 190                 (unsigned long)VMALLOC_TOTAL >> 10,
 191                 0ul, // used to be vmalloc 'used'
 192                 0ul  // used to be vmalloc 'largest_chunk'
 193 #ifdef CONFIG_MEMORY_FAILURE
 194                 , atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10)
 195 #endif
 196 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 197                 , K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
 198                    HPAGE_PMD_NR)
 199 #endif
 200 #ifdef CONFIG_CMA
 201                 , K(totalcma_pages)
 202                 , K(global_page_state(NR_FREE_CMA_PAGES))
 203 #endif
 204                 );
 205
 206         hugetlb_report_meminfo(m);
 207
 208         arch_report_meminfo(m);
 209
 210         return 0;
 211 #undef K
 212 }
 213
 214 static int meminfo_proc_open(struct inode *inode, struct file *file)
 215 {
 216         return single_open(file, meminfo_proc_show, NULL);
 217 }
 218
 219 static const struct file_operations meminfo_proc_fops = {
 220         .open           = meminfo_proc_open,
 221         .read           = seq_read,
 222         .llseek         = seq_lseek,
 223         .release        = single_release,
 224 };
 225
 226 static int __init proc_meminfo_init(void)
 227 {
 228         proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
 229         return 0;
 230 }
 231 fs_initcall(proc_meminfo_init);