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 available = i.freeram - totalreserve_pages; 62 63 /* 64 * Not all the page cache can be freed, otherwise the system will 65 * start swapping. Assume at least half of the page cache, or the 66 * low watermark worth of cache, needs to stay. 67 */ 68 pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE]; 69 pagecache -= min(pagecache / 2, wmark_low); 70 available += pagecache; 71 72 /* 73 * Part of the reclaimable slab consists of items that are in use, 74 * and cannot be freed. Cap this estimate at the low watermark. 75 */ 76 available += global_page_state(NR_SLAB_RECLAIMABLE) - 77 min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low); 78 79 if (available < 0) 80 available = 0; 81 82 /* 83 * Tagged format, for easy grepping and expansion. 84 */ 85 seq_printf(m, 86 "MemTotal: %8lu kB\n" 87 "MemFree: %8lu kB\n" 88 "MemAvailable: %8lu kB\n" 89 "Buffers: %8lu kB\n" 90 "Cached: %8lu kB\n" 91 "SwapCached: %8lu kB\n" 92 "Active: %8lu kB\n" 93 "Inactive: %8lu kB\n" 94 "Active(anon): %8lu kB\n" 95 "Inactive(anon): %8lu kB\n" 96 "Active(file): %8lu kB\n" 97 "Inactive(file): %8lu kB\n" 98 "Unevictable: %8lu kB\n" 99 "Mlocked: %8lu kB\n" 100 #ifdef CONFIG_HIGHMEM 101 "HighTotal: %8lu kB\n" 102 "HighFree: %8lu kB\n" 103 "LowTotal: %8lu kB\n" 104 "LowFree: %8lu kB\n" 105 #endif 106 #ifndef CONFIG_MMU 107 "MmapCopy: %8lu kB\n" 108 #endif 109 "SwapTotal: %8lu kB\n" 110 "SwapFree: %8lu kB\n" 111 "Dirty: %8lu kB\n" 112 "Writeback: %8lu kB\n" 113 "AnonPages: %8lu kB\n" 114 "Mapped: %8lu kB\n" 115 "Shmem: %8lu kB\n" 116 "Slab: %8lu kB\n" 117 "SReclaimable: %8lu kB\n" 118 "SUnreclaim: %8lu kB\n" 119 "KernelStack: %8lu kB\n" 120 "PageTables: %8lu kB\n" 121 #ifdef CONFIG_QUICKLIST 122 "Quicklists: %8lu kB\n" 123 #endif 124 "NFS_Unstable: %8lu kB\n" 125 "Bounce: %8lu kB\n" 126 "WritebackTmp: %8lu kB\n" 127 "CommitLimit: %8lu kB\n" 128 "Committed_AS: %8lu kB\n" 129 "VmallocTotal: %8lu kB\n" 130 "VmallocUsed: %8lu kB\n" 131 "VmallocChunk: %8lu kB\n" 132 #ifdef CONFIG_MEMORY_FAILURE 133 "HardwareCorrupted: %5lu kB\n" 134 #endif 135 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 136 "AnonHugePages: %8lu kB\n" 137 #endif 138 #ifdef CONFIG_CMA 139 "CmaTotal: %8lu kB\n" 140 "CmaFree: %8lu kB\n" 141 #endif 142 , 143 K(i.totalram), 144 K(i.freeram), 145 K(available), 146 K(i.bufferram), 147 K(cached), 148 K(total_swapcache_pages()), 149 K(pages[LRU_ACTIVE_ANON] + pages[LRU_ACTIVE_FILE]), 150 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]), 151 K(pages[LRU_ACTIVE_ANON]), 152 K(pages[LRU_INACTIVE_ANON]), 153 K(pages[LRU_ACTIVE_FILE]), 154 K(pages[LRU_INACTIVE_FILE]), 155 K(pages[LRU_UNEVICTABLE]), 156 K(global_page_state(NR_MLOCK)), 157 #ifdef CONFIG_HIGHMEM 158 K(i.totalhigh), 159 K(i.freehigh), 160 K(i.totalram-i.totalhigh), 161 K(i.freeram-i.freehigh), 162 #endif 163 #ifndef CONFIG_MMU 164 K((unsigned long) atomic_long_read(&mmap_pages_allocated)), 165 #endif 166 K(i.totalswap), 167 K(i.freeswap), 168 K(global_page_state(NR_FILE_DIRTY)), 169 K(global_page_state(NR_WRITEBACK)), 170 K(global_page_state(NR_ANON_PAGES)), 171 K(global_page_state(NR_FILE_MAPPED)), 172 K(i.sharedram), 173 K(global_page_state(NR_SLAB_RECLAIMABLE) + 174 global_page_state(NR_SLAB_UNRECLAIMABLE)), 175 K(global_page_state(NR_SLAB_RECLAIMABLE)), 176 K(global_page_state(NR_SLAB_UNRECLAIMABLE)), 177 global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024, 178 K(global_page_state(NR_PAGETABLE)), 179 #ifdef CONFIG_QUICKLIST 180 K(quicklist_total_size()), 181 #endif 182 K(global_page_state(NR_UNSTABLE_NFS)), 183 K(global_page_state(NR_BOUNCE)), 184 K(global_page_state(NR_WRITEBACK_TEMP)), 185 K(vm_commit_limit()), 186 K(committed), 187 (unsigned long)VMALLOC_TOTAL >> 10, 188 0ul, // used to be vmalloc 'used' 189 0ul // used to be vmalloc 'largest_chunk' 190 #ifdef CONFIG_MEMORY_FAILURE 191 , atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10) 192 #endif 193 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 194 , K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) * 195 HPAGE_PMD_NR) 196 #endif 197 #ifdef CONFIG_CMA 198 , K(totalcma_pages) 199 , K(global_page_state(NR_FREE_CMA_PAGES)) 200 #endif 201 ); 202 203 hugetlb_report_meminfo(m); 204 205 arch_report_meminfo(m); 206 207 return 0; 208 #undef K 209 } 210 211 static int meminfo_proc_open(struct inode *inode, struct file *file) 212 { 213 return single_open(file, meminfo_proc_show, NULL); 214 } 215 216 static const struct file_operations meminfo_proc_fops = { 217 .open = meminfo_proc_open, 218 .read = seq_read, 219 .llseek = seq_lseek, 220 .release = single_release, 221 }; 222 223 static int __init proc_meminfo_init(void) 224 { 225 proc_create("meminfo", 0, NULL, &meminfo_proc_fops); 226 return 0; 227 } 228 fs_initcall(proc_meminfo_init); 229