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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 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 

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