show_mem.c

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/*
 * Generic show_mem() implementation
 *
 * Copyright (C) 2008 Johannes Weiner <[email protected]>
 * All code subject to the GPL version 2.
 */

#include <linux/mm.h>
#include <linux/nmi.h>
#include <linux/quicklist.h>

void show_mem(unsigned int filter)
{
    pg_data_t *pgdat;
    unsigned long total = 0, reserved = 0, shared = 0,
        nonshared = 0, highmem = 0;

    printk("Mem-Info:\n");
    show_free_areas(filter);

    for_each_online_pgdat(pgdat) {
        unsigned long i, flags;

        pgdat_resize_lock(pgdat, &flags);
        for (i = 0; i < pgdat->node_spanned_pages; i++) {
            struct page *page;
            unsigned long pfn = pgdat->node_start_pfn + i;

            if (unlikely(!(i % MAX_ORDER_NR_PAGES)))
                touch_nmi_watchdog();

            if (!pfn_valid(pfn))
                continue;

            page = pfn_to_page(pfn);

            if (PageHighMem(page))
                highmem++;

            if (PageReserved(page))
                reserved++;
            else if (page_count(page) == 1)
                nonshared++;
            else if (page_count(page) > 1)
                shared += page_count(page) - 1;

            total++;
        }
        pgdat_resize_unlock(pgdat, &flags);
    }

    printk("%lu pages RAM\n", total);
#ifdef CONFIG_HIGHMEM
    printk("%lu pages HighMem\n", highmem);
#endif
    printk("%lu pages reserved\n", reserved);
    printk("%lu pages shared\n", shared);
    printk("%lu pages non-shared\n", nonshared);
#ifdef CONFIG_QUICKLIST
    printk("%lu pages in pagetable cache\n",
        quicklist_total_size());
#endif
}