LXR linux/lib/show

   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
  12void 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}
  67