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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 void show_val_kb(struct seq_file *m, const char *s, unsigned long num)
 27 {
 28         char v[32];
 29         static const char blanks[7] = {' ', ' ', ' ', ' ',' ', ' ', ' '};
 30         int len;
 31 
 32         len = num_to_str(v, sizeof(v), num << (PAGE_SHIFT - 10));
 33 
 34         seq_write(m, s, 16);
 35 
 36         if (len > 0) {
 37                 if (len < 8)
 38                         seq_write(m, blanks, 8 - len);
 39 
 40                 seq_write(m, v, len);
 41         }
 42         seq_write(m, " kB\n", 4);
 43 }
 44 
 45 static int meminfo_proc_show(struct seq_file *m, void *v)
 46 {
 47         struct sysinfo i;
 48         unsigned long committed;
 49         long cached;
 50         long available;
 51         unsigned long pages[NR_LRU_LISTS];
 52         int lru;
 53 
 54         si_meminfo(&i);
 55         si_swapinfo(&i);
 56         committed = percpu_counter_read_positive(&vm_committed_as);
 57 
 58         cached = global_node_page_state(NR_FILE_PAGES) -
 59                         total_swapcache_pages() - i.bufferram;
 60         if (cached < 0)
 61                 cached = 0;
 62 
 63         for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
 64                 pages[lru] = global_node_page_state(NR_LRU_BASE + lru);
 65 
 66         available = si_mem_available();
 67 
 68         show_val_kb(m, "MemTotal:       ", i.totalram);
 69         show_val_kb(m, "MemFree:        ", i.freeram);
 70         show_val_kb(m, "MemAvailable:   ", available);
 71         show_val_kb(m, "Buffers:        ", i.bufferram);
 72         show_val_kb(m, "Cached:         ", cached);
 73         show_val_kb(m, "SwapCached:     ", total_swapcache_pages());
 74         show_val_kb(m, "Active:         ", pages[LRU_ACTIVE_ANON] +
 75                                            pages[LRU_ACTIVE_FILE]);
 76         show_val_kb(m, "Inactive:       ", pages[LRU_INACTIVE_ANON] +
 77                                            pages[LRU_INACTIVE_FILE]);
 78         show_val_kb(m, "Active(anon):   ", pages[LRU_ACTIVE_ANON]);
 79         show_val_kb(m, "Inactive(anon): ", pages[LRU_INACTIVE_ANON]);
 80         show_val_kb(m, "Active(file):   ", pages[LRU_ACTIVE_FILE]);
 81         show_val_kb(m, "Inactive(file): ", pages[LRU_INACTIVE_FILE]);
 82         show_val_kb(m, "Unevictable:    ", pages[LRU_UNEVICTABLE]);
 83         show_val_kb(m, "Mlocked:        ", global_page_state(NR_MLOCK));
 84 
 85 #ifdef CONFIG_HIGHMEM
 86         show_val_kb(m, "HighTotal:      ", i.totalhigh);
 87         show_val_kb(m, "HighFree:       ", i.freehigh);
 88         show_val_kb(m, "LowTotal:       ", i.totalram - i.totalhigh);
 89         show_val_kb(m, "LowFree:        ", i.freeram - i.freehigh);
 90 #endif
 91 
 92 #ifndef CONFIG_MMU
 93         show_val_kb(m, "MmapCopy:       ",
 94                     (unsigned long)atomic_long_read(&mmap_pages_allocated));
 95 #endif
 96 
 97         show_val_kb(m, "SwapTotal:      ", i.totalswap);
 98         show_val_kb(m, "SwapFree:       ", i.freeswap);
 99         show_val_kb(m, "Dirty:          ",
100                     global_node_page_state(NR_FILE_DIRTY));
101         show_val_kb(m, "Writeback:      ",
102                     global_node_page_state(NR_WRITEBACK));
103         show_val_kb(m, "AnonPages:      ",
104                     global_node_page_state(NR_ANON_MAPPED));
105         show_val_kb(m, "Mapped:         ",
106                     global_node_page_state(NR_FILE_MAPPED));
107         show_val_kb(m, "Shmem:          ", i.sharedram);
108         show_val_kb(m, "Slab:           ",
109                     global_page_state(NR_SLAB_RECLAIMABLE) +
110                     global_page_state(NR_SLAB_UNRECLAIMABLE));
111 
112         show_val_kb(m, "SReclaimable:   ",
113                     global_page_state(NR_SLAB_RECLAIMABLE));
114         show_val_kb(m, "SUnreclaim:     ",
115                     global_page_state(NR_SLAB_UNRECLAIMABLE));
116         seq_printf(m, "KernelStack:    %8lu kB\n",
117                    global_page_state(NR_KERNEL_STACK_KB));
118         show_val_kb(m, "PageTables:     ",
119                     global_page_state(NR_PAGETABLE));
120 #ifdef CONFIG_QUICKLIST
121         show_val_kb(m, "Quicklists:     ", quicklist_total_size());
122 #endif
123 
124         show_val_kb(m, "NFS_Unstable:   ",
125                     global_node_page_state(NR_UNSTABLE_NFS));
126         show_val_kb(m, "Bounce:         ",
127                     global_page_state(NR_BOUNCE));
128         show_val_kb(m, "WritebackTmp:   ",
129                     global_node_page_state(NR_WRITEBACK_TEMP));
130         show_val_kb(m, "CommitLimit:    ", vm_commit_limit());
131         show_val_kb(m, "Committed_AS:   ", committed);
132         seq_printf(m, "VmallocTotal:   %8lu kB\n",
133                    (unsigned long)VMALLOC_TOTAL >> 10);
134         show_val_kb(m, "VmallocUsed:    ", 0ul);
135         show_val_kb(m, "VmallocChunk:   ", 0ul);
136 
137 #ifdef CONFIG_MEMORY_FAILURE
138         seq_printf(m, "HardwareCorrupted: %5lu kB\n",
139                    atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10));
140 #endif
141 
142 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
143         show_val_kb(m, "AnonHugePages:  ",
144                     global_node_page_state(NR_ANON_THPS) * HPAGE_PMD_NR);
145         show_val_kb(m, "ShmemHugePages: ",
146                     global_node_page_state(NR_SHMEM_THPS) * HPAGE_PMD_NR);
147         show_val_kb(m, "ShmemPmdMapped: ",
148                     global_node_page_state(NR_SHMEM_PMDMAPPED) * HPAGE_PMD_NR);
149 #endif
150 
151 #ifdef CONFIG_CMA
152         show_val_kb(m, "CmaTotal:       ", totalcma_pages);
153         show_val_kb(m, "CmaFree:        ",
154                     global_page_state(NR_FREE_CMA_PAGES));
155 #endif
156 
157         hugetlb_report_meminfo(m);
158 
159         arch_report_meminfo(m);
160 
161         return 0;
162 }
163 
164 static int meminfo_proc_open(struct inode *inode, struct file *file)
165 {
166         return single_open(file, meminfo_proc_show, NULL);
167 }
168 
169 static const struct file_operations meminfo_proc_fops = {
170         .open           = meminfo_proc_open,
171         .read           = seq_read,
172         .llseek         = seq_lseek,
173         .release        = single_release,
174 };
175 
176 static int __init proc_meminfo_init(void)
177 {
178         proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
179         return 0;
180 }
181 fs_initcall(proc_meminfo_init);
182 

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