fs/proc/meminfo.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/fs.h>
   3 #include <linux/init.h>
   4 #include <linux/kernel.h>
   5 #include <linux/mm.h>
   6 #include <linux/hugetlb.h>
   7 #include <linux/mman.h>
   8 #include <linux/mmzone.h>
   9 #include <linux/proc_fs.h>
  10 #include <linux/percpu.h>
  11 #include <linux/seq_file.h>
  12 #include <linux/swap.h>
  13 #include <linux/vmstat.h>
  14 #include <linux/atomic.h>
  15 #include <linux/vmalloc.h>
  16 #ifdef CONFIG_CMA
  17 #include <linux/cma.h>
  18 #endif
  19 #include <asm/page.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         seq_put_decimal_ull_width(m, s, num << (PAGE_SHIFT - 10), 8);
  29         seq_write(m, " kB\n", 4);
  30 }
  31
  32 static int meminfo_proc_show(struct seq_file *m, void *v)
  33 {
  34         struct sysinfo i;
  35         unsigned long committed;
  36         long cached;
  37         long available;
  38         unsigned long pages[NR_LRU_LISTS];
  39         unsigned long sreclaimable, sunreclaim;
  40         int lru;
  41
  42         si_meminfo(&i);
  43         si_swapinfo(&i);
  44         committed = vm_memory_committed();
  45
  46         cached = global_node_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_node_page_state(NR_LRU_BASE + lru);
  53
  54         available = si_mem_available();
  55         sreclaimable = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B);
  56         sunreclaim = global_node_page_state_pages(NR_SLAB_UNRECLAIMABLE_B);
  57
  58         show_val_kb(m, "MemTotal:       ", i.totalram);
  59         show_val_kb(m, "MemFree:        ", i.freeram);
  60         show_val_kb(m, "MemAvailable:   ", available);
  61         show_val_kb(m, "Buffers:        ", i.bufferram);
  62         show_val_kb(m, "Cached:         ", cached);
  63         show_val_kb(m, "SwapCached:     ", total_swapcache_pages());
  64         show_val_kb(m, "Active:         ", pages[LRU_ACTIVE_ANON] +
  65                                            pages[LRU_ACTIVE_FILE]);
  66         show_val_kb(m, "Inactive:       ", pages[LRU_INACTIVE_ANON] +
  67                                            pages[LRU_INACTIVE_FILE]);
  68         show_val_kb(m, "Active(anon):   ", pages[LRU_ACTIVE_ANON]);
  69         show_val_kb(m, "Inactive(anon): ", pages[LRU_INACTIVE_ANON]);
  70         show_val_kb(m, "Active(file):   ", pages[LRU_ACTIVE_FILE]);
  71         show_val_kb(m, "Inactive(file): ", pages[LRU_INACTIVE_FILE]);
  72         show_val_kb(m, "Unevictable:    ", pages[LRU_UNEVICTABLE]);
  73         show_val_kb(m, "Mlocked:        ", global_zone_page_state(NR_MLOCK));
  74
  75 #ifdef CONFIG_HIGHMEM
  76         show_val_kb(m, "HighTotal:      ", i.totalhigh);
  77         show_val_kb(m, "HighFree:       ", i.freehigh);
  78         show_val_kb(m, "LowTotal:       ", i.totalram - i.totalhigh);
  79         show_val_kb(m, "LowFree:        ", i.freeram - i.freehigh);
  80 #endif
  81
  82 #ifndef CONFIG_MMU
  83         show_val_kb(m, "MmapCopy:       ",
  84                     (unsigned long)atomic_long_read(&mmap_pages_allocated));
  85 #endif
  86
  87         show_val_kb(m, "SwapTotal:      ", i.totalswap);
  88         show_val_kb(m, "SwapFree:       ", i.freeswap);
  89         show_val_kb(m, "Dirty:          ",
  90                     global_node_page_state(NR_FILE_DIRTY));
  91         show_val_kb(m, "Writeback:      ",
  92                     global_node_page_state(NR_WRITEBACK));
  93         show_val_kb(m, "AnonPages:      ",
  94                     global_node_page_state(NR_ANON_MAPPED));
  95         show_val_kb(m, "Mapped:         ",
  96                     global_node_page_state(NR_FILE_MAPPED));
  97         show_val_kb(m, "Shmem:          ", i.sharedram);
  98         show_val_kb(m, "KReclaimable:   ", sreclaimable +
  99                     global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE));
 100         show_val_kb(m, "Slab:           ", sreclaimable + sunreclaim);
 101         show_val_kb(m, "SReclaimable:   ", sreclaimable);
 102         show_val_kb(m, "SUnreclaim:     ", sunreclaim);
 103         seq_printf(m, "KernelStack:    %8lu kB\n",
 104                    global_node_page_state(NR_KERNEL_STACK_KB));
 105 #ifdef CONFIG_SHADOW_CALL_STACK
 106         seq_printf(m, "ShadowCallStack:%8lu kB\n",
 107                    global_node_page_state(NR_KERNEL_SCS_KB));
 108 #endif
 109         show_val_kb(m, "PageTables:     ",
 110                     global_node_page_state(NR_PAGETABLE));
 111
 112         show_val_kb(m, "NFS_Unstable:   ", 0);
 113         show_val_kb(m, "Bounce:         ",
 114                     global_zone_page_state(NR_BOUNCE));
 115         show_val_kb(m, "WritebackTmp:   ",
 116                     global_node_page_state(NR_WRITEBACK_TEMP));
 117         show_val_kb(m, "CommitLimit:    ", vm_commit_limit());
 118         show_val_kb(m, "Committed_AS:   ", committed);
 119         seq_printf(m, "VmallocTotal:   %8lu kB\n",
 120                    (unsigned long)VMALLOC_TOTAL >> 10);
 121         show_val_kb(m, "VmallocUsed:    ", vmalloc_nr_pages());
 122         show_val_kb(m, "VmallocChunk:   ", 0ul);
 123         show_val_kb(m, "Percpu:         ", pcpu_nr_pages());
 124
 125 #ifdef CONFIG_MEMORY_FAILURE
 126         seq_printf(m, "HardwareCorrupted: %5lu kB\n",
 127                    atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10));
 128 #endif
 129
 130 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 131         show_val_kb(m, "AnonHugePages:  ",
 132                     global_node_page_state(NR_ANON_THPS));
 133         show_val_kb(m, "ShmemHugePages: ",
 134                     global_node_page_state(NR_SHMEM_THPS));
 135         show_val_kb(m, "ShmemPmdMapped: ",
 136                     global_node_page_state(NR_SHMEM_PMDMAPPED));
 137         show_val_kb(m, "FileHugePages:  ",
 138                     global_node_page_state(NR_FILE_THPS));
 139         show_val_kb(m, "FilePmdMapped:  ",
 140                     global_node_page_state(NR_FILE_PMDMAPPED));
 141 #endif
 142
 143 #ifdef CONFIG_CMA
 144         show_val_kb(m, "CmaTotal:       ", totalcma_pages);
 145         show_val_kb(m, "CmaFree:        ",
 146                     global_zone_page_state(NR_FREE_CMA_PAGES));
 147 #endif
 148
 149         hugetlb_report_meminfo(m);
 150
 151         arch_report_meminfo(m);
 152
 153         return 0;
 154 }
 155
 156 static int __init proc_meminfo_init(void)
 157 {
 158         proc_create_single("meminfo", 0, NULL, meminfo_proc_show);
 159         return 0;
 160 }
 161 fs_initcall(proc_meminfo_init);