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