2 #include <linux/init.h>
3 #include <linux/kernel.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>
16 #include <linux/cma.h>
19 #include <asm/pgtable.h>
22 void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
26 static int meminfo_proc_show(struct seq_file *m, void *v)
29 unsigned long committed;
32 unsigned long pagecache;
33 unsigned long wmark_low = 0;
34 unsigned long pages[NR_LRU_LISTS];
39 * display in kilobytes.
41 #define K(x) ((x) << (PAGE_SHIFT - 10))
44 committed = percpu_counter_read_positive(&vm_committed_as);
46 cached = global_page_state(NR_FILE_PAGES) -
47 total_swapcache_pages() - i.bufferram;
51 for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
52 pages[lru] = global_page_state(NR_LRU_BASE + lru);
55 wmark_low += zone->watermark[WMARK_LOW];
58 * Estimate the amount of memory available for userspace allocations,
59 * without causing swapping.
61 available = i.freeram - totalreserve_pages;
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.
68 pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE];
69 pagecache -= min(pagecache / 2, wmark_low);
70 available += pagecache;
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.
76 available += global_page_state(NR_SLAB_RECLAIMABLE) -
77 min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low);
83 * Tagged format, for easy grepping and expansion.
88 "MemAvailable: %8lu kB\n"
91 "SwapCached: %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"
100 #ifdef CONFIG_HIGHMEM
101 "HighTotal: %8lu kB\n"
102 "HighFree: %8lu kB\n"
103 "LowTotal: %8lu kB\n"
107 "MmapCopy: %8lu kB\n"
109 "SwapTotal: %8lu kB\n"
110 "SwapFree: %8lu kB\n"
112 "Writeback: %8lu kB\n"
113 "AnonPages: %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"
124 "NFS_Unstable: %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"
135 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
136 "AnonHugePages: %8lu kB\n"
139 "CmaTotal: %8lu kB\n"
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
160 K(i.totalram-i.totalhigh),
161 K(i.freeram-i.freehigh),
164 K((unsigned long) atomic_long_read(&mmap_pages_allocated)),
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)),
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()),
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()),
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)
193 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
194 , K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
199 , K(global_page_state(NR_FREE_CMA_PAGES))
203 hugetlb_report_meminfo(m);
205 arch_report_meminfo(m);
211 static int meminfo_proc_open(struct inode *inode, struct file *file)
213 return single_open(file, meminfo_proc_show, NULL);
216 static const struct file_operations meminfo_proc_fops = {
217 .open = meminfo_proc_open,
220 .release = single_release,
223 static int __init proc_meminfo_init(void)
225 proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
228 fs_initcall(proc_meminfo_init);