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