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Linux/fs/proc/meminfo.c

  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 pages[NR_LRU_LISTS];
 33         int lru;
 34 
 35 /*
 36  * display in kilobytes.
 37  */
 38 #define K(x) ((x) << (PAGE_SHIFT - 10))
 39         si_meminfo(&i);
 40         si_swapinfo(&i);
 41         committed = percpu_counter_read_positive(&vm_committed_as);
 42 
 43         cached = global_page_state(NR_FILE_PAGES) -
 44                         total_swapcache_pages() - i.bufferram;
 45         if (cached < 0)
 46                 cached = 0;
 47 
 48         for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
 49                 pages[lru] = global_page_state(NR_LRU_BASE + lru);
 50 
 51         available = si_mem_available();
 52 
 53         /*
 54          * Tagged format, for easy grepping and expansion.
 55          */
 56         seq_printf(m,
 57                 "MemTotal:       %8lu kB\n"
 58                 "MemFree:        %8lu kB\n"
 59                 "MemAvailable:   %8lu kB\n"
 60                 "Buffers:        %8lu kB\n"
 61                 "Cached:         %8lu kB\n"
 62                 "SwapCached:     %8lu kB\n"
 63                 "Active:         %8lu kB\n"
 64                 "Inactive:       %8lu kB\n"
 65                 "Active(anon):   %8lu kB\n"
 66                 "Inactive(anon): %8lu kB\n"
 67                 "Active(file):   %8lu kB\n"
 68                 "Inactive(file): %8lu kB\n"
 69                 "Unevictable:    %8lu kB\n"
 70                 "Mlocked:        %8lu kB\n"
 71 #ifdef CONFIG_HIGHMEM
 72                 "HighTotal:      %8lu kB\n"
 73                 "HighFree:       %8lu kB\n"
 74                 "LowTotal:       %8lu kB\n"
 75                 "LowFree:        %8lu kB\n"
 76 #endif
 77 #ifndef CONFIG_MMU
 78                 "MmapCopy:       %8lu kB\n"
 79 #endif
 80                 "SwapTotal:      %8lu kB\n"
 81                 "SwapFree:       %8lu kB\n"
 82                 "Dirty:          %8lu kB\n"
 83                 "Writeback:      %8lu kB\n"
 84                 "AnonPages:      %8lu kB\n"
 85                 "Mapped:         %8lu kB\n"
 86                 "Shmem:          %8lu kB\n"
 87                 "Slab:           %8lu kB\n"
 88                 "SReclaimable:   %8lu kB\n"
 89                 "SUnreclaim:     %8lu kB\n"
 90                 "KernelStack:    %8lu kB\n"
 91                 "PageTables:     %8lu kB\n"
 92 #ifdef CONFIG_QUICKLIST
 93                 "Quicklists:     %8lu kB\n"
 94 #endif
 95                 "NFS_Unstable:   %8lu kB\n"
 96                 "Bounce:         %8lu kB\n"
 97                 "WritebackTmp:   %8lu kB\n"
 98                 "CommitLimit:    %8lu kB\n"
 99                 "Committed_AS:   %8lu kB\n"
100                 "VmallocTotal:   %8lu kB\n"
101                 "VmallocUsed:    %8lu kB\n"
102                 "VmallocChunk:   %8lu kB\n"
103 #ifdef CONFIG_MEMORY_FAILURE
104                 "HardwareCorrupted: %5lu kB\n"
105 #endif
106 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
107                 "AnonHugePages:  %8lu kB\n"
108 #endif
109 #ifdef CONFIG_CMA
110                 "CmaTotal:       %8lu kB\n"
111                 "CmaFree:        %8lu kB\n"
112 #endif
113                 ,
114                 K(i.totalram),
115                 K(i.freeram),
116                 K(available),
117                 K(i.bufferram),
118                 K(cached),
119                 K(total_swapcache_pages()),
120                 K(pages[LRU_ACTIVE_ANON]   + pages[LRU_ACTIVE_FILE]),
121                 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
122                 K(pages[LRU_ACTIVE_ANON]),
123                 K(pages[LRU_INACTIVE_ANON]),
124                 K(pages[LRU_ACTIVE_FILE]),
125                 K(pages[LRU_INACTIVE_FILE]),
126                 K(pages[LRU_UNEVICTABLE]),
127                 K(global_page_state(NR_MLOCK)),
128 #ifdef CONFIG_HIGHMEM
129                 K(i.totalhigh),
130                 K(i.freehigh),
131                 K(i.totalram-i.totalhigh),
132                 K(i.freeram-i.freehigh),
133 #endif
134 #ifndef CONFIG_MMU
135                 K((unsigned long) atomic_long_read(&mmap_pages_allocated)),
136 #endif
137                 K(i.totalswap),
138                 K(i.freeswap),
139                 K(global_page_state(NR_FILE_DIRTY)),
140                 K(global_page_state(NR_WRITEBACK)),
141                 K(global_page_state(NR_ANON_PAGES)),
142                 K(global_page_state(NR_FILE_MAPPED)),
143                 K(i.sharedram),
144                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
145                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
146                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
147                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
148                 global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024,
149                 K(global_page_state(NR_PAGETABLE)),
150 #ifdef CONFIG_QUICKLIST
151                 K(quicklist_total_size()),
152 #endif
153                 K(global_page_state(NR_UNSTABLE_NFS)),
154                 K(global_page_state(NR_BOUNCE)),
155                 K(global_page_state(NR_WRITEBACK_TEMP)),
156                 K(vm_commit_limit()),
157                 K(committed),
158                 (unsigned long)VMALLOC_TOTAL >> 10,
159                 0ul, // used to be vmalloc 'used'
160                 0ul  // used to be vmalloc 'largest_chunk'
161 #ifdef CONFIG_MEMORY_FAILURE
162                 , atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10)
163 #endif
164 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
165                 , K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
166                    HPAGE_PMD_NR)
167 #endif
168 #ifdef CONFIG_CMA
169                 , K(totalcma_pages)
170                 , K(global_page_state(NR_FREE_CMA_PAGES))
171 #endif
172                 );
173 
174         hugetlb_report_meminfo(m);
175 
176         arch_report_meminfo(m);
177 
178         return 0;
179 #undef K
180 }
181 
182 static int meminfo_proc_open(struct inode *inode, struct file *file)
183 {
184         return single_open(file, meminfo_proc_show, NULL);
185 }
186 
187 static const struct file_operations meminfo_proc_fops = {
188         .open           = meminfo_proc_open,
189         .read           = seq_read,
190         .llseek         = seq_lseek,
191         .release        = single_release,
192 };
193 
194 static int __init proc_meminfo_init(void)
195 {
196         proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
197         return 0;
198 }
199 fs_initcall(proc_meminfo_init);
200 

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