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/quicklist.h>
  12 #include <linux/seq_file.h>
  13 #include <linux/swap.h>
  14 #include <linux/vmstat.h>
  15 #include <linux/atomic.h>
  16 #include <linux/vmalloc.h>
  17 #ifdef CONFIG_CMA
  18 #include <linux/cma.h>
  19 #endif
  20 #include <asm/page.h>
  21 #include <asm/pgtable.h>
  22 #include "internal.h"
  23
  24 void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
  25 {
  26 }
  27
  28 static void show_val_kb(struct seq_file *m, const char *s, unsigned long num)
  29 {
  30         seq_put_decimal_ull_width(m, s, num << (PAGE_SHIFT - 10), 8);
  31         seq_write(m, " kB\n", 4);
  32 }
  33
  34 static int meminfo_proc_show(struct seq_file *m, void *v)
  35 {
  36         struct sysinfo i;
  37         unsigned long committed;
  38         long cached;
  39         long available;
  40         unsigned long pages[NR_LRU_LISTS];
  41         unsigned long sreclaimable, sunreclaim;
  42         int lru;
  43
  44         si_meminfo(&i);
  45         si_swapinfo(&i);
  46         committed = percpu_counter_read_positive(&vm_committed_as);
  47
  48         cached = global_node_page_state(NR_FILE_PAGES) -
  49                         total_swapcache_pages() - i.bufferram;
  50         if (cached < 0)
  51                 cached = 0;
  52
  53         for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
  54                 pages[lru] = global_node_page_state(NR_LRU_BASE + lru);
  55
  56         available = si_mem_available();
  57         sreclaimable = global_node_page_state(NR_SLAB_RECLAIMABLE);
  58         sunreclaim = global_node_page_state(NR_SLAB_UNRECLAIMABLE);
  59
  60         show_val_kb(m, "MemTotal:       ", i.totalram);
  61         show_val_kb(m, "MemFree:        ", i.freeram);
  62         show_val_kb(m, "MemAvailable:   ", available);
  63         show_val_kb(m, "Buffers:        ", i.bufferram);
  64         show_val_kb(m, "Cached:         ", cached);
  65         show_val_kb(m, "SwapCached:     ", total_swapcache_pages());
  66         show_val_kb(m, "Active:         ", pages[LRU_ACTIVE_ANON] +
  67                                            pages[LRU_ACTIVE_FILE]);
  68         show_val_kb(m, "Inactive:       ", pages[LRU_INACTIVE_ANON] +
  69                                            pages[LRU_INACTIVE_FILE]);
  70         show_val_kb(m, "Active(anon):   ", pages[LRU_ACTIVE_ANON]);
  71         show_val_kb(m, "Inactive(anon): ", pages[LRU_INACTIVE_ANON]);
  72         show_val_kb(m, "Active(file):   ", pages[LRU_ACTIVE_FILE]);
  73         show_val_kb(m, "Inactive(file): ", pages[LRU_INACTIVE_FILE]);
  74         show_val_kb(m, "Unevictable:    ", pages[LRU_UNEVICTABLE]);
  75         show_val_kb(m, "Mlocked:        ", global_zone_page_state(NR_MLOCK));
  76
  77 #ifdef CONFIG_HIGHMEM
  78         show_val_kb(m, "HighTotal:      ", i.totalhigh);
  79         show_val_kb(m, "HighFree:       ", i.freehigh);
  80         show_val_kb(m, "LowTotal:       ", i.totalram - i.totalhigh);
  81         show_val_kb(m, "LowFree:        ", i.freeram - i.freehigh);
  82 #endif
  83
  84 #ifndef CONFIG_MMU
  85         show_val_kb(m, "MmapCopy:       ",
  86                     (unsigned long)atomic_long_read(&mmap_pages_allocated));
  87 #endif
  88
  89         show_val_kb(m, "SwapTotal:      ", i.totalswap);
  90         show_val_kb(m, "SwapFree:       ", i.freeswap);
  91         show_val_kb(m, "Dirty:          ",
  92                     global_node_page_state(NR_FILE_DIRTY));
  93         show_val_kb(m, "Writeback:      ",
  94                     global_node_page_state(NR_WRITEBACK));
  95         show_val_kb(m, "AnonPages:      ",
  96                     global_node_page_state(NR_ANON_MAPPED));
  97         show_val_kb(m, "Mapped:         ",
  98                     global_node_page_state(NR_FILE_MAPPED));
  99         show_val_kb(m, "Shmem:          ", i.sharedram);
 100         show_val_kb(m, "KReclaimable:   ", sreclaimable +
 101                     global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE));
 102         show_val_kb(m, "Slab:           ", sreclaimable + sunreclaim);
 103         show_val_kb(m, "SReclaimable:   ", sreclaimable);
 104         show_val_kb(m, "SUnreclaim:     ", sunreclaim);
 105         seq_printf(m, "KernelStack:    %8lu kB\n",
 106                    global_zone_page_state(NR_KERNEL_STACK_KB));
 107         show_val_kb(m, "PageTables:     ",
 108                     global_zone_page_state(NR_PAGETABLE));
 109 #ifdef CONFIG_QUICKLIST
 110         show_val_kb(m, "Quicklists:     ", quicklist_total_size());
 111 #endif
 112
 113         show_val_kb(m, "NFS_Unstable:   ",
 114                     global_node_page_state(NR_UNSTABLE_NFS));
 115         show_val_kb(m, "Bounce:         ",
 116                     global_zone_page_state(NR_BOUNCE));
 117         show_val_kb(m, "WritebackTmp:   ",
 118                     global_node_page_state(NR_WRITEBACK_TEMP));
 119         show_val_kb(m, "CommitLimit:    ", vm_commit_limit());
 120         show_val_kb(m, "Committed_AS:   ", committed);
 121         seq_printf(m, "VmallocTotal:   %8lu kB\n",
 122                    (unsigned long)VMALLOC_TOTAL >> 10);
 123         show_val_kb(m, "VmallocUsed:    ", 0ul);
 124         show_val_kb(m, "VmallocChunk:   ", 0ul);
 125         show_val_kb(m, "Percpu:         ", pcpu_nr_pages());
 126
 127 #ifdef CONFIG_MEMORY_FAILURE
 128         seq_printf(m, "HardwareCorrupted: %5lu kB\n",
 129                    atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10));
 130 #endif
 131
 132 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 133         show_val_kb(m, "AnonHugePages:  ",
 134                     global_node_page_state(NR_ANON_THPS) * HPAGE_PMD_NR);
 135         show_val_kb(m, "ShmemHugePages: ",
 136                     global_node_page_state(NR_SHMEM_THPS) * HPAGE_PMD_NR);
 137         show_val_kb(m, "ShmemPmdMapped: ",
 138                     global_node_page_state(NR_SHMEM_PMDMAPPED) * HPAGE_PMD_NR);
 139 #endif
 140
 141 #ifdef CONFIG_CMA
 142         show_val_kb(m, "CmaTotal:       ", totalcma_pages);
 143         show_val_kb(m, "CmaFree:        ",
 144                     global_zone_page_state(NR_FREE_CMA_PAGES));
 145 #endif
 146
 147         hugetlb_report_meminfo(m);
 148
 149         arch_report_meminfo(m);
 150
 151         return 0;
 152 }
 153
 154 static int __init proc_meminfo_init(void)
 155 {
 156         proc_create_single("meminfo", 0, NULL, meminfo_proc_show);
 157         return 0;
 158 }
 159 fs_initcall(proc_meminfo_init);