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(unsigned int filter)
  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(filter);
  20
  21         if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
  22                 return;
  23
  24         for_each_online_pgdat(pgdat) {
  25                 unsigned long i, flags;
  26
  27                 pgdat_resize_lock(pgdat, &flags);
  28                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
  29                         struct page *page;
  30                         unsigned long pfn = pgdat->node_start_pfn + i;
  31
  32                         if (unlikely(!(i % MAX_ORDER_NR_PAGES)))
  33                                 touch_nmi_watchdog();
  34
  35                         if (!pfn_valid(pfn))
  36                                 continue;
  37
  38                         page = pfn_to_page(pfn);
  39
  40                         if (PageHighMem(page))
  41                                 highmem++;
  42
  43                         if (PageReserved(page))
  44                                 reserved++;
  45                         else if (page_count(page) == 1)
  46                                 nonshared++;
  47                         else if (page_count(page) > 1)
  48                                 shared += page_count(page) - 1;
  49
  50                         total++;
  51                 }
  52                 pgdat_resize_unlock(pgdat, &flags);
  53         }
  54
  55         printk("%lu pages RAM\n", total);
  56 #ifdef CONFIG_HIGHMEM
  57         printk("%lu pages HighMem\n", highmem);
  58 #endif
  59         printk("%lu pages reserved\n", reserved);
  60         printk("%lu pages shared\n", shared);
  61         printk("%lu pages non-shared\n", nonshared);
  62 #ifdef CONFIG_QUICKLIST
  63         printk("%lu pages in pagetable cache\n",
  64                 quicklist_total_size());
  65 #endif
  66 }