Root/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
12void 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}
64

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