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         struct vmalloc_info vmi;
  31         long cached;
  32         long available;
  33         unsigned long pagecache;
  34         unsigned long wmark_low = 0;
  35         unsigned long pages[NR_LRU_LISTS];
  36         struct zone *zone;
  37         int lru;
  38
  39 /*
  40  * display in kilobytes.
  41  */
  42 #define K(x) ((x) << (PAGE_SHIFT - 10))
  43         si_meminfo(&i);
  44         si_swapinfo(&i);
  45         committed = percpu_counter_read_positive(&vm_committed_as);
  46
  47         cached = global_page_state(NR_FILE_PAGES) -
  48                         total_swapcache_pages() - i.bufferram;
  49         if (cached < 0)
  50                 cached = 0;
  51
  52         get_vmalloc_info(&vmi);
  53
  54         for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
  55                 pages[lru] = global_page_state(NR_LRU_BASE + lru);
  56
  57         for_each_zone(zone)
  58                 wmark_low += zone->watermark[WMARK_LOW];
  59
  60         /*
  61          * Estimate the amount of memory available for userspace allocations,
  62          * without causing swapping.
  63          *
  64          * Free memory cannot be taken below the low watermark, before the
  65          * system starts swapping.
  66          */
  67         available = i.freeram - wmark_low;
  68
  69         /*
  70          * Not all the page cache can be freed, otherwise the system will
  71          * start swapping. Assume at least half of the page cache, or the
  72          * low watermark worth of cache, needs to stay.
  73          */
  74         pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE];
  75         pagecache -= min(pagecache / 2, wmark_low);
  76         available += pagecache;
  77
  78         /*
  79          * Part of the reclaimable slab consists of items that are in use,
  80          * and cannot be freed. Cap this estimate at the low watermark.
  81          */
  82         available += global_page_state(NR_SLAB_RECLAIMABLE) -
  83                      min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low);
  84
  85         if (available < 0)
  86                 available = 0;
  87
  88         /*
  89          * Tagged format, for easy grepping and expansion.
  90          */
  91         seq_printf(m,
  92                 "MemTotal:       %8lu kB\n"
  93                 "MemFree:        %8lu kB\n"
  94                 "MemAvailable:   %8lu kB\n"
  95                 "Buffers:        %8lu kB\n"
  96                 "Cached:         %8lu kB\n"
  97                 "SwapCached:     %8lu kB\n"
  98                 "Active:         %8lu kB\n"
  99                 "Inactive:       %8lu kB\n"
 100                 "Active(anon):   %8lu kB\n"
 101                 "Inactive(anon): %8lu kB\n"
 102                 "Active(file):   %8lu kB\n"
 103                 "Inactive(file): %8lu kB\n"
 104                 "Unevictable:    %8lu kB\n"
 105                 "Mlocked:        %8lu kB\n"
 106 #ifdef CONFIG_HIGHMEM
 107                 "HighTotal:      %8lu kB\n"
 108                 "HighFree:       %8lu kB\n"
 109                 "LowTotal:       %8lu kB\n"
 110                 "LowFree:        %8lu kB\n"
 111 #endif
 112 #ifndef CONFIG_MMU
 113                 "MmapCopy:       %8lu kB\n"
 114 #endif
 115                 "SwapTotal:      %8lu kB\n"
 116                 "SwapFree:       %8lu kB\n"
 117                 "Dirty:          %8lu kB\n"
 118                 "Writeback:      %8lu kB\n"
 119                 "AnonPages:      %8lu kB\n"
 120                 "Mapped:         %8lu kB\n"
 121                 "Shmem:          %8lu kB\n"
 122                 "Slab:           %8lu kB\n"
 123                 "SReclaimable:   %8lu kB\n"
 124                 "SUnreclaim:     %8lu kB\n"
 125                 "KernelStack:    %8lu kB\n"
 126                 "PageTables:     %8lu kB\n"
 127 #ifdef CONFIG_QUICKLIST
 128                 "Quicklists:     %8lu kB\n"
 129 #endif
 130                 "NFS_Unstable:   %8lu kB\n"
 131                 "Bounce:         %8lu kB\n"
 132                 "WritebackTmp:   %8lu kB\n"
 133                 "CommitLimit:    %8lu kB\n"
 134                 "Committed_AS:   %8lu kB\n"
 135                 "VmallocTotal:   %8lu kB\n"
 136                 "VmallocUsed:    %8lu kB\n"
 137                 "VmallocChunk:   %8lu kB\n"
 138 #ifdef CONFIG_MEMORY_FAILURE
 139                 "HardwareCorrupted: %5lu kB\n"
 140 #endif
 141 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 142                 "AnonHugePages:  %8lu kB\n"
 143 #endif
 144 #ifdef CONFIG_CMA
 145                 "CmaTotal:       %8lu kB\n"
 146                 "CmaFree:        %8lu kB\n"
 147 #endif
 148                 ,
 149                 K(i.totalram),
 150                 K(i.freeram),
 151                 K(available),
 152                 K(i.bufferram),
 153                 K(cached),
 154                 K(total_swapcache_pages()),
 155                 K(pages[LRU_ACTIVE_ANON]   + pages[LRU_ACTIVE_FILE]),
 156                 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
 157                 K(pages[LRU_ACTIVE_ANON]),
 158                 K(pages[LRU_INACTIVE_ANON]),
 159                 K(pages[LRU_ACTIVE_FILE]),
 160                 K(pages[LRU_INACTIVE_FILE]),
 161                 K(pages[LRU_UNEVICTABLE]),
 162                 K(global_page_state(NR_MLOCK)),
 163 #ifdef CONFIG_HIGHMEM
 164                 K(i.totalhigh),
 165                 K(i.freehigh),
 166                 K(i.totalram-i.totalhigh),
 167                 K(i.freeram-i.freehigh),
 168 #endif
 169 #ifndef CONFIG_MMU
 170                 K((unsigned long) atomic_long_read(&mmap_pages_allocated)),
 171 #endif
 172                 K(i.totalswap),
 173                 K(i.freeswap),
 174                 K(global_page_state(NR_FILE_DIRTY)),
 175                 K(global_page_state(NR_WRITEBACK)),
 176                 K(global_page_state(NR_ANON_PAGES)),
 177                 K(global_page_state(NR_FILE_MAPPED)),
 178                 K(i.sharedram),
 179                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
 180                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
 181                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
 182                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
 183                 global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024,
 184                 K(global_page_state(NR_PAGETABLE)),
 185 #ifdef CONFIG_QUICKLIST
 186                 K(quicklist_total_size()),
 187 #endif
 188                 K(global_page_state(NR_UNSTABLE_NFS)),
 189                 K(global_page_state(NR_BOUNCE)),
 190                 K(global_page_state(NR_WRITEBACK_TEMP)),
 191                 K(vm_commit_limit()),
 192                 K(committed),
 193                 (unsigned long)VMALLOC_TOTAL >> 10,
 194                 vmi.used >> 10,
 195                 vmi.largest_chunk >> 10
 196 #ifdef CONFIG_MEMORY_FAILURE
 197                 , atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10)
 198 #endif
 199 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 200                 , K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
 201                    HPAGE_PMD_NR)
 202 #endif
 203 #ifdef CONFIG_CMA
 204                 , K(totalcma_pages)
 205                 , K(global_page_state(NR_FREE_CMA_PAGES))
 206 #endif
 207                 );
 208
 209         hugetlb_report_meminfo(m);
 210
 211         arch_report_meminfo(m);
 212
 213         return 0;
 214 #undef K
 215 }
 216
 217 static int meminfo_proc_open(struct inode *inode, struct file *file)
 218 {
 219         return single_open(file, meminfo_proc_show, NULL);
 220 }
 221
 222 static const struct file_operations meminfo_proc_fops = {
 223         .open           = meminfo_proc_open,
 224         .read           = seq_read,
 225         .llseek         = seq_lseek,
 226         .release        = single_release,
 227 };
 228
 229 static int __init proc_meminfo_init(void)
 230 {
 231         proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
 232         return 0;
 233 }
 234 fs_initcall(proc_meminfo_init);