1#include <linux/fs.h> 2#include <linux/init.h> 3#include <linux/kernel.h> 4#include <linux/mm.h> 5#include <linux/hugetlb.h> 6#include <linux/mman.h> 7#include <linux/mmzone.h> 8#include <linux/proc_fs.h> 9#include <linux/quicklist.h> 10#include <linux/seq_file.h> 11#include <linux/swap.h> 12#include <linux/vmstat.h> 13#include <linux/atomic.h> 14#include <linux/vmalloc.h> 15#include <asm/page.h> 16#include <asm/pgtable.h> 17#include "internal.h" 18 19void __attribute__((weak)) arch_report_meminfo(struct seq_file *m) 20{ 21} 22 23static int meminfo_proc_show(struct seq_file *m, void *v) 24{ 25 struct sysinfo i; 26 unsigned long committed; 27 struct vmalloc_info vmi; 28 long cached; 29 long available; 30 unsigned long pagecache; 31 unsigned long wmark_low = 0; 32 unsigned long pages[NR_LRU_LISTS]; 33 struct zone *zone; 34 int lru; 35 36/* 37 * display in kilobytes. 38 */ 39#define K(x) ((x) << (PAGE_SHIFT - 10)) 40 si_meminfo(&i); 41 si_swapinfo(&i); 42 committed = percpu_counter_read_positive(&vm_committed_as); 43 44 cached = global_page_state(NR_FILE_PAGES) - 45 total_swapcache_pages() - i.bufferram; 46 if (cached < 0) 47 cached = 0; 48 49 get_vmalloc_info(&vmi); 50 51 for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++) 52 pages[lru] = global_page_state(NR_LRU_BASE + lru); 53 54 for_each_zone(zone) 55 wmark_low += zone->watermark[WMARK_LOW]; 56 57 /* 58 * Estimate the amount of memory available for userspace allocations, 59 * without causing swapping. 60 * 61 * Free memory cannot be taken below the low watermark, before the 62 * system starts swapping. 63 */ 64 available = i.freeram - wmark_low; 65 66 /* 67 * Not all the page cache can be freed, otherwise the system will 68 * start swapping. Assume at least half of the page cache, or the 69 * low watermark worth of cache, needs to stay. 70 */ 71 pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE]; 72 pagecache -= min(pagecache / 2, wmark_low); 73 available += pagecache; 74 75 /* 76 * Part of the reclaimable slab consists of items that are in use, 77 * and cannot be freed. Cap this estimate at the low watermark. 78 */ 79 available += global_page_state(NR_SLAB_RECLAIMABLE) - 80 min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low); 81 82 if (available < 0) 83 available = 0; 84 85 /* 86 * Tagged format, for easy grepping and expansion. 87 */ 88 seq_printf(m, 89 "MemTotal: %8lu kB\n" 90 "MemFree: %8lu kB\n" 91 "MemAvailable: %8lu kB\n" 92 "Buffers: %8lu kB\n" 93 "Cached: %8lu kB\n" 94 "SwapCached: %8lu kB\n" 95 "Active: %8lu kB\n" 96 "Inactive: %8lu kB\n" 97 "Active(anon): %8lu kB\n" 98 "Inactive(anon): %8lu kB\n" 99 "Active(file): %8lu kB\n" 100 "Inactive(file): %8lu kB\n" 101 "Unevictable: %8lu kB\n" 102 "Mlocked: %8lu kB\n" 103#ifdef CONFIG_HIGHMEM 104 "HighTotal: %8lu kB\n" 105 "HighFree: %8lu kB\n" 106 "LowTotal: %8lu kB\n" 107 "LowFree: %8lu kB\n" 108#endif 109#ifndef CONFIG_MMU 110 "MmapCopy: %8lu kB\n" 111#endif 112 "SwapTotal: %8lu kB\n" 113 "SwapFree: %8lu kB\n" 114 "Dirty: %8lu kB\n" 115 "Writeback: %8lu kB\n" 116 "AnonPages: %8lu kB\n" 117 "Mapped: %8lu kB\n" 118 "Shmem: %8lu kB\n" 119 "Slab: %8lu kB\n" 120 "SReclaimable: %8lu kB\n" 121 "SUnreclaim: %8lu kB\n" 122 "KernelStack: %8lu kB\n" 123 "PageTables: %8lu kB\n" 124#ifdef CONFIG_QUICKLIST 125 "Quicklists: %8lu kB\n" 126#endif 127 "NFS_Unstable: %8lu kB\n" 128 "Bounce: %8lu kB\n" 129 "WritebackTmp: %8lu kB\n" 130 "CommitLimit: %8lu kB\n" 131 "Committed_AS: %8lu kB\n" 132 "VmallocTotal: %8lu kB\n" 133 "VmallocUsed: %8lu kB\n" 134 "VmallocChunk: %8lu kB\n" 135#ifdef CONFIG_MEMORY_FAILURE 136 "HardwareCorrupted: %5lu kB\n" 137#endif 138#ifdef CONFIG_TRANSPARENT_HUGEPAGE 139 "AnonHugePages: %8lu kB\n" 140#endif 141 , 142 K(i.totalram), 143 K(i.freeram), 144 K(available), 145 K(i.bufferram), 146 K(cached), 147 K(total_swapcache_pages()), 148 K(pages[LRU_ACTIVE_ANON] + pages[LRU_ACTIVE_FILE]), 149 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]), 150 K(pages[LRU_ACTIVE_ANON]), 151 K(pages[LRU_INACTIVE_ANON]), 152 K(pages[LRU_ACTIVE_FILE]), 153 K(pages[LRU_INACTIVE_FILE]), 154 K(pages[LRU_UNEVICTABLE]), 155 K(global_page_state(NR_MLOCK)), 156#ifdef CONFIG_HIGHMEM 157 K(i.totalhigh), 158 K(i.freehigh), 159 K(i.totalram-i.totalhigh), 160 K(i.freeram-i.freehigh), 161#endif 162#ifndef CONFIG_MMU 163 K((unsigned long) atomic_long_read(&mmap_pages_allocated)), 164#endif 165 K(i.totalswap), 166 K(i.freeswap), 167 K(global_page_state(NR_FILE_DIRTY)), 168 K(global_page_state(NR_WRITEBACK)), 169 K(global_page_state(NR_ANON_PAGES)), 170 K(global_page_state(NR_FILE_MAPPED)), 171 K(i.sharedram), 172 K(global_page_state(NR_SLAB_RECLAIMABLE) + 173 global_page_state(NR_SLAB_UNRECLAIMABLE)), 174 K(global_page_state(NR_SLAB_RECLAIMABLE)), 175 K(global_page_state(NR_SLAB_UNRECLAIMABLE)), 176 global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024, 177 K(global_page_state(NR_PAGETABLE)), 178#ifdef CONFIG_QUICKLIST 179 K(quicklist_total_size()), 180#endif 181 K(global_page_state(NR_UNSTABLE_NFS)), 182 K(global_page_state(NR_BOUNCE)), 183 K(global_page_state(NR_WRITEBACK_TEMP)), 184 K(vm_commit_limit()), 185 K(committed), 186 (unsigned long)VMALLOC_TOTAL >> 10, 187 vmi.used >> 10, 188 vmi.largest_chunk >> 10 189#ifdef CONFIG_MEMORY_FAILURE 190 ,atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10) 191#endif 192#ifdef CONFIG_TRANSPARENT_HUGEPAGE 193 ,K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) * 194 HPAGE_PMD_NR) 195#endif 196 ); 197 198 hugetlb_report_meminfo(m); 199 200 arch_report_meminfo(m); 201 202 return 0; 203#undef K 204} 205 206static int meminfo_proc_open(struct inode *inode, struct file *file) 207{ 208 return single_open(file, meminfo_proc_show, NULL); 209} 210 211static const struct file_operations meminfo_proc_fops = { 212 .open = meminfo_proc_open, 213 .read = seq_read, 214 .llseek = seq_lseek, 215 .release = single_release, 216}; 217 218static int __init proc_meminfo_init(void) 219{ 220 proc_create("meminfo", 0, NULL, &meminfo_proc_fops); 221 return 0; 222} 223fs_initcall(proc_meminfo_init); 224