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 #ifdef CONFIG_CMA 16 #include <linux/cma.h> 17 #endif 18 #include <asm/page.h> 19 #include <asm/pgtable.h> 20 #include "internal.h" 21 22 void __attribute__((weak)) arch_report_meminfo(struct seq_file *m) 23 { 24 } 25 26 static int meminfo_proc_show(struct seq_file *m, void *v) 27 { 28 struct sysinfo i; 29 unsigned long committed; 30 long cached; 31 long available; 32 unsigned long pagecache; 33 unsigned long wmark_low = 0; 34 unsigned long pages[NR_LRU_LISTS]; 35 struct zone *zone; 36 int lru; 37 38 /* 39 * display in kilobytes. 40 */ 41 #define K(x) ((x) << (PAGE_SHIFT - 10)) 42 si_meminfo(&i); 43 si_swapinfo(&i); 44 committed = percpu_counter_read_positive(&vm_committed_as); 45 46 cached = global_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_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 #ifdef CONFIG_CMA 142 "CmaTotal: %8lu kB\n" 143 "CmaFree: %8lu kB\n" 144 #endif 145 , 146 K(i.totalram), 147 K(i.freeram), 148 K(available), 149 K(i.bufferram), 150 K(cached), 151 K(total_swapcache_pages()), 152 K(pages[LRU_ACTIVE_ANON] + pages[LRU_ACTIVE_FILE]), 153 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]), 154 K(pages[LRU_ACTIVE_ANON]), 155 K(pages[LRU_INACTIVE_ANON]), 156 K(pages[LRU_ACTIVE_FILE]), 157 K(pages[LRU_INACTIVE_FILE]), 158 K(pages[LRU_UNEVICTABLE]), 159 K(global_page_state(NR_MLOCK)), 160 #ifdef CONFIG_HIGHMEM 161 K(i.totalhigh), 162 K(i.freehigh), 163 K(i.totalram-i.totalhigh), 164 K(i.freeram-i.freehigh), 165 #endif 166 #ifndef CONFIG_MMU 167 K((unsigned long) atomic_long_read(&mmap_pages_allocated)), 168 #endif 169 K(i.totalswap), 170 K(i.freeswap), 171 K(global_page_state(NR_FILE_DIRTY)), 172 K(global_page_state(NR_WRITEBACK)), 173 K(global_page_state(NR_ANON_PAGES)), 174 K(global_page_state(NR_FILE_MAPPED)), 175 K(i.sharedram), 176 K(global_page_state(NR_SLAB_RECLAIMABLE) + 177 global_page_state(NR_SLAB_UNRECLAIMABLE)), 178 K(global_page_state(NR_SLAB_RECLAIMABLE)), 179 K(global_page_state(NR_SLAB_UNRECLAIMABLE)), 180 global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024, 181 K(global_page_state(NR_PAGETABLE)), 182 #ifdef CONFIG_QUICKLIST 183 K(quicklist_total_size()), 184 #endif 185 K(global_page_state(NR_UNSTABLE_NFS)), 186 K(global_page_state(NR_BOUNCE)), 187 K(global_page_state(NR_WRITEBACK_TEMP)), 188 K(vm_commit_limit()), 189 K(committed), 190 (unsigned long)VMALLOC_TOTAL >> 10, 191 0ul, // used to be vmalloc 'used' 192 0ul // used to be vmalloc 'largest_chunk' 193 #ifdef CONFIG_MEMORY_FAILURE 194 , atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10) 195 #endif 196 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 197 , K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) * 198 HPAGE_PMD_NR) 199 #endif 200 #ifdef CONFIG_CMA 201 , K(totalcma_pages) 202 , K(global_page_state(NR_FREE_CMA_PAGES)) 203 #endif 204 ); 205 206 hugetlb_report_meminfo(m); 207 208 arch_report_meminfo(m); 209 210 return 0; 211 #undef K 212 } 213 214 static int meminfo_proc_open(struct inode *inode, struct file *file) 215 { 216 return single_open(file, meminfo_proc_show, NULL); 217 } 218 219 static const struct file_operations meminfo_proc_fops = { 220 .open = meminfo_proc_open, 221 .read = seq_read, 222 .llseek = seq_lseek, 223 .release = single_release, 224 }; 225 226 static int __init proc_meminfo_init(void) 227 { 228 proc_create("meminfo", 0, NULL, &meminfo_proc_fops); 229 return 0; 230 } 231 fs_initcall(proc_meminfo_init); 232