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/quicklist.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         int lru;
  41
  42         si_meminfo(&i);
  43         si_swapinfo(&i);
  44         committed = percpu_counter_read_positive(&vm_committed_as);
  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
  56         show_val_kb(m, "MemTotal:       ", i.totalram);
  57         show_val_kb(m, "MemFree:        ", i.freeram);
  58         show_val_kb(m, "MemAvailable:   ", available);
  59         show_val_kb(m, "Buffers:        ", i.bufferram);
  60         show_val_kb(m, "Cached:         ", cached);
  61         show_val_kb(m, "SwapCached:     ", total_swapcache_pages());
  62         show_val_kb(m, "Active:         ", pages[LRU_ACTIVE_ANON] +
  63                                            pages[LRU_ACTIVE_FILE]);
  64         show_val_kb(m, "Inactive:       ", pages[LRU_INACTIVE_ANON] +
  65                                            pages[LRU_INACTIVE_FILE]);
  66         show_val_kb(m, "Active(anon):   ", pages[LRU_ACTIVE_ANON]);
  67         show_val_kb(m, "Inactive(anon): ", pages[LRU_INACTIVE_ANON]);
  68         show_val_kb(m, "Active(file):   ", pages[LRU_ACTIVE_FILE]);
  69         show_val_kb(m, "Inactive(file): ", pages[LRU_INACTIVE_FILE]);
  70         show_val_kb(m, "Unevictable:    ", pages[LRU_UNEVICTABLE]);
  71         show_val_kb(m, "Mlocked:        ", global_zone_page_state(NR_MLOCK));
  72
  73 #ifdef CONFIG_HIGHMEM
  74         show_val_kb(m, "HighTotal:      ", i.totalhigh);
  75         show_val_kb(m, "HighFree:       ", i.freehigh);
  76         show_val_kb(m, "LowTotal:       ", i.totalram - i.totalhigh);
  77         show_val_kb(m, "LowFree:        ", i.freeram - i.freehigh);
  78 #endif
  79
  80 #ifndef CONFIG_MMU
  81         show_val_kb(m, "MmapCopy:       ",
  82                     (unsigned long)atomic_long_read(&mmap_pages_allocated));
  83 #endif
  84
  85         show_val_kb(m, "SwapTotal:      ", i.totalswap);
  86         show_val_kb(m, "SwapFree:       ", i.freeswap);
  87         show_val_kb(m, "Dirty:          ",
  88                     global_node_page_state(NR_FILE_DIRTY));
  89         show_val_kb(m, "Writeback:      ",
  90                     global_node_page_state(NR_WRITEBACK));
  91         show_val_kb(m, "AnonPages:      ",
  92                     global_node_page_state(NR_ANON_MAPPED));
  93         show_val_kb(m, "Mapped:         ",
  94                     global_node_page_state(NR_FILE_MAPPED));
  95         show_val_kb(m, "Shmem:          ", i.sharedram);
  96         show_val_kb(m, "Slab:           ",
  97                     global_node_page_state(NR_SLAB_RECLAIMABLE) +
  98                     global_node_page_state(NR_SLAB_UNRECLAIMABLE));
  99
 100         show_val_kb(m, "SReclaimable:   ",
 101                     global_node_page_state(NR_SLAB_RECLAIMABLE));
 102         show_val_kb(m, "SUnreclaim:     ",
 103                     global_node_page_state(NR_SLAB_UNRECLAIMABLE));
 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 #ifdef CONFIG_QUICKLIST
 109         show_val_kb(m, "Quicklists:     ", quicklist_total_size());
 110 #endif
 111
 112         show_val_kb(m, "NFS_Unstable:   ",
 113                     global_node_page_state(NR_UNSTABLE_NFS));
 114         show_val_kb(m, "Bounce:         ",
 115                     global_zone_page_state(NR_BOUNCE));
 116         show_val_kb(m, "WritebackTmp:   ",
 117                     global_node_page_state(NR_WRITEBACK_TEMP));
 118         show_val_kb(m, "CommitLimit:    ", vm_commit_limit());
 119         show_val_kb(m, "Committed_AS:   ", committed);
 120         seq_printf(m, "VmallocTotal:   %8lu kB\n",
 121                    (unsigned long)VMALLOC_TOTAL >> 10);
 122         show_val_kb(m, "VmallocUsed:    ", 0ul);
 123         show_val_kb(m, "VmallocChunk:   ", 0ul);
 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) * HPAGE_PMD_NR);
 133         show_val_kb(m, "ShmemHugePages: ",
 134                     global_node_page_state(NR_SHMEM_THPS) * HPAGE_PMD_NR);
 135         show_val_kb(m, "ShmemPmdMapped: ",
 136                     global_node_page_state(NR_SHMEM_PMDMAPPED) * HPAGE_PMD_NR);
 137 #endif
 138
 139 #ifdef CONFIG_CMA
 140         show_val_kb(m, "CmaTotal:       ", totalcma_pages);
 141         show_val_kb(m, "CmaFree:        ",
 142                     global_zone_page_state(NR_FREE_CMA_PAGES));
 143 #endif
 144
 145         hugetlb_report_meminfo(m);
 146
 147         arch_report_meminfo(m);
 148
 149         return 0;
 150 }
 151
 152 static int meminfo_proc_open(struct inode *inode, struct file *file)
 153 {
 154         return single_open(file, meminfo_proc_show, NULL);
 155 }
 156
 157 static const struct file_operations meminfo_proc_fops = {
 158         .open           = meminfo_proc_open,
 159         .read           = seq_read,
 160         .llseek         = seq_lseek,
 161         .release        = single_release,
 162 };
 163
 164 static int __init proc_meminfo_init(void)
 165 {
 166         proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
 167         return 0;
 168 }
 169 fs_initcall(proc_meminfo_init);