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boolzone_reclaimable(struct zone *zone)

{

       return zone_page_state_snapshot(zone, NR_PAGES_SCANNED) <

              zone_reclaimable_pages(zone)* 6;

}

static inlineunsigned long zone_page_state_snapshot(structzone *zone,

                                   enumzone_stat_item item)

{

       long x =atomic_long_read(&zone->vm_stat[item]);

#ifdef CONFIG_SMP

       int cpu;

       for_each_online_cpu(cpu)

              x += per_cpu_ptr(zone->pageset,cpu)->vm_stat_diff[item];

       if (x < 0)

              x = 0;

#endif

       return x;

}

unsigned long zone_reclaimable_pages(struct zone *zone)

{

       unsigned long nr;

       nr = zone_page_state_snapshot(zone, NR_ACTIVE_FILE) +

           zone_page_state_snapshot(zone, NR_INACTIVE_FILE) +

           zone_page_state_snapshot(zone, NR_ISOLATED_FILE);

       if (get_nr_swap_pages() > 0)

              nr +=zone_page_state_snapshot(zone, NR_ACTIVE_ANON) +

                    zone_page_state_snapshot(zone, NR_INACTIVE_ANON) +

                    zone_page_state_snapshot(zone, NR_ISOLATED_ANON);

       return nr;

}

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