lib/mpi: added missing NULL check
[linux-2.6.git] / 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         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 }