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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 #include <asm/page.h>
 16 #include <asm/pgtable.h>
 17 #include "internal.h"
 18 
 19 void __attribute__((weak)) arch_report_meminfo(struct seq_file *m)
 20 {
 21 }
 22 
 23 static int meminfo_proc_show(struct seq_file *m, void *v)
 24 {
 25         struct sysinfo i;
 26         unsigned long committed;
 27         struct vmalloc_info vmi;
 28         long cached;
 29         long available;
 30         unsigned long pagecache;
 31         unsigned long wmark_low = 0;
 32         unsigned long pages[NR_LRU_LISTS];
 33         struct zone *zone;
 34         int lru;
 35 
 36 /*
 37  * display in kilobytes.
 38  */
 39 #define K(x) ((x) << (PAGE_SHIFT - 10))
 40         si_meminfo(&i);
 41         si_swapinfo(&i);
 42         committed = percpu_counter_read_positive(&vm_committed_as);
 43 
 44         cached = global_page_state(NR_FILE_PAGES) -
 45                         total_swapcache_pages() - i.bufferram;
 46         if (cached < 0)
 47                 cached = 0;
 48 
 49         get_vmalloc_info(&vmi);
 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                 ,
142                 K(i.totalram),
143                 K(i.freeram),
144                 K(available),
145                 K(i.bufferram),
146                 K(cached),
147                 K(total_swapcache_pages()),
148                 K(pages[LRU_ACTIVE_ANON]   + pages[LRU_ACTIVE_FILE]),
149                 K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE]),
150                 K(pages[LRU_ACTIVE_ANON]),
151                 K(pages[LRU_INACTIVE_ANON]),
152                 K(pages[LRU_ACTIVE_FILE]),
153                 K(pages[LRU_INACTIVE_FILE]),
154                 K(pages[LRU_UNEVICTABLE]),
155                 K(global_page_state(NR_MLOCK)),
156 #ifdef CONFIG_HIGHMEM
157                 K(i.totalhigh),
158                 K(i.freehigh),
159                 K(i.totalram-i.totalhigh),
160                 K(i.freeram-i.freehigh),
161 #endif
162 #ifndef CONFIG_MMU
163                 K((unsigned long) atomic_long_read(&mmap_pages_allocated)),
164 #endif
165                 K(i.totalswap),
166                 K(i.freeswap),
167                 K(global_page_state(NR_FILE_DIRTY)),
168                 K(global_page_state(NR_WRITEBACK)),
169                 K(global_page_state(NR_ANON_PAGES)),
170                 K(global_page_state(NR_FILE_MAPPED)),
171                 K(i.sharedram),
172                 K(global_page_state(NR_SLAB_RECLAIMABLE) +
173                                 global_page_state(NR_SLAB_UNRECLAIMABLE)),
174                 K(global_page_state(NR_SLAB_RECLAIMABLE)),
175                 K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
176                 global_page_state(NR_KERNEL_STACK) * THREAD_SIZE / 1024,
177                 K(global_page_state(NR_PAGETABLE)),
178 #ifdef CONFIG_QUICKLIST
179                 K(quicklist_total_size()),
180 #endif
181                 K(global_page_state(NR_UNSTABLE_NFS)),
182                 K(global_page_state(NR_BOUNCE)),
183                 K(global_page_state(NR_WRITEBACK_TEMP)),
184                 K(vm_commit_limit()),
185                 K(committed),
186                 (unsigned long)VMALLOC_TOTAL >> 10,
187                 vmi.used >> 10,
188                 vmi.largest_chunk >> 10
189 #ifdef CONFIG_MEMORY_FAILURE
190                 ,atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10)
191 #endif
192 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
193                 ,K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
194                    HPAGE_PMD_NR)
195 #endif
196                 );
197 
198         hugetlb_report_meminfo(m);
199 
200         arch_report_meminfo(m);
201 
202         return 0;
203 #undef K
204 }
205 
206 static int meminfo_proc_open(struct inode *inode, struct file *file)
207 {
208         return single_open(file, meminfo_proc_show, NULL);
209 }
210 
211 static const struct file_operations meminfo_proc_fops = {
212         .open           = meminfo_proc_open,
213         .read           = seq_read,
214         .llseek         = seq_lseek,
215         .release        = single_release,
216 };
217 
218 static int __init proc_meminfo_init(void)
219 {
220         proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
221         return 0;
222 }
223 fs_initcall(proc_meminfo_init);
224 

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