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 void show_val_kb(struct seq_file *m, const char *s, unsigned long num)
  27 {
  28         char v[32];
  29         static const char blanks[7] = {' ', ' ', ' ', ' ',' ', ' ', ' '};
  30         int len;
  31
  32         len = num_to_str(v, sizeof(v), num << (PAGE_SHIFT - 10));
  33
  34         seq_write(m, s, 16);
  35
  36         if (len > 0) {
  37                 if (len < 8)
  38                         seq_write(m, blanks, 8 - len);
  39
  40                 seq_write(m, v, len);
  41         }
  42         seq_write(m, " kB\n", 4);
  43 }
  44
  45 static int meminfo_proc_show(struct seq_file *m, void *v)
  46 {
  47         struct sysinfo i;
  48         unsigned long committed;
  49         long cached;
  50         long available;
  51         unsigned long pages[NR_LRU_LISTS];
  52         int lru;
  53
  54         si_meminfo(&i);
  55         si_swapinfo(&i);
  56         committed = percpu_counter_read_positive(&vm_committed_as);
  57
  58         cached = global_node_page_state(NR_FILE_PAGES) -
  59                         total_swapcache_pages() - i.bufferram;
  60         if (cached < 0)
  61                 cached = 0;
  62
  63         for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
  64                 pages[lru] = global_node_page_state(NR_LRU_BASE + lru);
  65
  66         available = si_mem_available();
  67
  68         show_val_kb(m, "MemTotal:       ", i.totalram);
  69         show_val_kb(m, "MemFree:        ", i.freeram);
  70         show_val_kb(m, "MemAvailable:   ", available);
  71         show_val_kb(m, "Buffers:        ", i.bufferram);
  72         show_val_kb(m, "Cached:         ", cached);
  73         show_val_kb(m, "SwapCached:     ", total_swapcache_pages());
  74         show_val_kb(m, "Active:         ", pages[LRU_ACTIVE_ANON] +
  75                                            pages[LRU_ACTIVE_FILE]);
  76         show_val_kb(m, "Inactive:       ", pages[LRU_INACTIVE_ANON] +
  77                                            pages[LRU_INACTIVE_FILE]);
  78         show_val_kb(m, "Active(anon):   ", pages[LRU_ACTIVE_ANON]);
  79         show_val_kb(m, "Inactive(anon): ", pages[LRU_INACTIVE_ANON]);
  80         show_val_kb(m, "Active(file):   ", pages[LRU_ACTIVE_FILE]);
  81         show_val_kb(m, "Inactive(file): ", pages[LRU_INACTIVE_FILE]);
  82         show_val_kb(m, "Unevictable:    ", pages[LRU_UNEVICTABLE]);
  83         show_val_kb(m, "Mlocked:        ", global_page_state(NR_MLOCK));
  84
  85 #ifdef CONFIG_HIGHMEM
  86         show_val_kb(m, "HighTotal:      ", i.totalhigh);
  87         show_val_kb(m, "HighFree:       ", i.freehigh);
  88         show_val_kb(m, "LowTotal:       ", i.totalram - i.totalhigh);
  89         show_val_kb(m, "LowFree:        ", i.freeram - i.freehigh);
  90 #endif
  91
  92 #ifndef CONFIG_MMU
  93         show_val_kb(m, "MmapCopy:       ",
  94                     (unsigned long)atomic_long_read(&mmap_pages_allocated));
  95 #endif
  96
  97         show_val_kb(m, "SwapTotal:      ", i.totalswap);
  98         show_val_kb(m, "SwapFree:       ", i.freeswap);
  99         show_val_kb(m, "Dirty:          ",
 100                     global_node_page_state(NR_FILE_DIRTY));
 101         show_val_kb(m, "Writeback:      ",
 102                     global_node_page_state(NR_WRITEBACK));
 103         show_val_kb(m, "AnonPages:      ",
 104                     global_node_page_state(NR_ANON_MAPPED));
 105         show_val_kb(m, "Mapped:         ",
 106                     global_node_page_state(NR_FILE_MAPPED));
 107         show_val_kb(m, "Shmem:          ", i.sharedram);
 108         show_val_kb(m, "Slab:           ",
 109                     global_page_state(NR_SLAB_RECLAIMABLE) +
 110                     global_page_state(NR_SLAB_UNRECLAIMABLE));
 111
 112         show_val_kb(m, "SReclaimable:   ",
 113                     global_page_state(NR_SLAB_RECLAIMABLE));
 114         show_val_kb(m, "SUnreclaim:     ",
 115                     global_page_state(NR_SLAB_UNRECLAIMABLE));
 116         seq_printf(m, "KernelStack:    %8lu kB\n",
 117                    global_page_state(NR_KERNEL_STACK_KB));
 118         show_val_kb(m, "PageTables:     ",
 119                     global_page_state(NR_PAGETABLE));
 120 #ifdef CONFIG_QUICKLIST
 121         show_val_kb(m, "Quicklists:     ", quicklist_total_size());
 122 #endif
 123
 124         show_val_kb(m, "NFS_Unstable:   ",
 125                     global_node_page_state(NR_UNSTABLE_NFS));
 126         show_val_kb(m, "Bounce:         ",
 127                     global_page_state(NR_BOUNCE));
 128         show_val_kb(m, "WritebackTmp:   ",
 129                     global_node_page_state(NR_WRITEBACK_TEMP));
 130         show_val_kb(m, "CommitLimit:    ", vm_commit_limit());
 131         show_val_kb(m, "Committed_AS:   ", committed);
 132         seq_printf(m, "VmallocTotal:   %8lu kB\n",
 133                    (unsigned long)VMALLOC_TOTAL >> 10);
 134         show_val_kb(m, "VmallocUsed:    ", 0ul);
 135         show_val_kb(m, "VmallocChunk:   ", 0ul);
 136
 137 #ifdef CONFIG_MEMORY_FAILURE
 138         seq_printf(m, "HardwareCorrupted: %5lu kB\n",
 139                    atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10));
 140 #endif
 141
 142 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 143         show_val_kb(m, "AnonHugePages:  ",
 144                     global_node_page_state(NR_ANON_THPS) * HPAGE_PMD_NR);
 145         show_val_kb(m, "ShmemHugePages: ",
 146                     global_node_page_state(NR_SHMEM_THPS) * HPAGE_PMD_NR);
 147         show_val_kb(m, "ShmemPmdMapped: ",
 148                     global_node_page_state(NR_SHMEM_PMDMAPPED) * HPAGE_PMD_NR);
 149 #endif
 150
 151 #ifdef CONFIG_CMA
 152         show_val_kb(m, "CmaTotal:       ", totalcma_pages);
 153         show_val_kb(m, "CmaFree:        ",
 154                     global_page_state(NR_FREE_CMA_PAGES));
 155 #endif
 156
 157         hugetlb_report_meminfo(m);
 158
 159         arch_report_meminfo(m);
 160
 161         return 0;
 162 }
 163
 164 static int meminfo_proc_open(struct inode *inode, struct file *file)
 165 {
 166         return single_open(file, meminfo_proc_show, NULL);
 167 }
 168
 169 static const struct file_operations meminfo_proc_fops = {
 170         .open           = meminfo_proc_open,
 171         .read           = seq_read,
 172         .llseek         = seq_lseek,
 173         .release        = single_release,
 174 };
 175
 176 static int __init proc_meminfo_init(void)
 177 {
 178         proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
 179         return 0;
 180 }
 181 fs_initcall(proc_meminfo_init);