root/lib/show_mem.c

DEFINITIONS

1. show_mem

/*
 * Generic show_mem() implementation
 *
 * Copyright (C) 2008 Johannes Weiner <hannes@saeurebad.de>
 * All code subject to the GPL version 2.
 */

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

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

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

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