lib/show_mem.c

   1 /*
   2  * Generic show_mem() implementation
   3  *
   4  * Copyright (C) 2008 Johannes Weiner <hannes@saeurebad.de>
   5  * All code subject to the GPL version 2.
   6  */
   7
   8 #include <linux/mm.h>
   9 #include <linux/nmi.h>
  10 #include <linux/quicklist.h>
  11
  12 void show_mem(void)
  13 {
  14         pg_data_t *pgdat;
  15         unsigned long total = 0, reserved = 0, shared = 0,
  16                 nonshared = 0, highmem = 0;
  17
  18         printk("Mem-Info:\n");
  19         show_free_areas();
  20
  21         for_each_online_pgdat(pgdat) {
  22                 unsigned long i, flags;
  23
  24                 pgdat_resize_lock(pgdat, &flags);
  25                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
  26                         struct page *page;
  27                         unsigned long pfn = pgdat->node_start_pfn + i;
  28
  29                         if (unlikely(!(i % MAX_ORDER_NR_PAGES)))
  30                                 touch_nmi_watchdog();
  31
  32                         if (!pfn_valid(pfn))
  33                                 continue;
  34
  35                         page = pfn_to_page(pfn);
  36
  37                         if (PageHighMem(page))
  38                                 highmem++;
  39
  40                         if (PageReserved(page))
  41                                 reserved++;
  42                         else if (page_count(page) == 1)
  43                                 nonshared++;
  44                         else if (page_count(page) > 1)
  45                                 shared += page_count(page) - 1;
  46
  47                         total++;
  48                 }
  49                 pgdat_resize_unlock(pgdat, &flags);
  50         }
  51
  52         printk("%lu pages RAM\n", total);
  53 #ifdef CONFIG_HIGHMEM
  54         printk("%lu pages HighMem\n", highmem);
  55 #endif
  56         printk("%lu pages reserved\n", reserved);
  57         printk("%lu pages shared\n", shared);
  58         printk("%lu pages non-shared\n", nonshared);
  59 #ifdef CONFIG_QUICKLIST
  60         printk("%lu pages in pagetable cache\n",
  61                 quicklist_total_size());
  62 #endif
  63 }