static int kswapd_balance_pgdat(pg_data_t * pgdat)
{
int need_more_balance = 0, i;
zone_t * zone;
for (i = pgdat->nr_zones-1; i >= 0; i--) {
zone = pgdat->node_zones + i;
debug_lock_break(0);
#ifndef CONFIG_PREEMPT
if (unlikely(current->need_resched))
schedule();
#endif
if (!zone->need_balance)
continue;
if (!try_to_free_pages(zone, GFP_KSWAPD, 0)) {
zone->need_balance = 0;
__set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(HZ);
continue;
}
if (check_classzone_need_balance(zone))
need_more_balance = 1;
else
zone->need_balance = 0;
}
return need_more_balance;
}
struct page *alloc_page (enum palloc_flags flags)
{
struct page *page;
void *kaddr = palloc_get_page(flags);
while (kaddr == NULL)
{
kaddr = try_to_free_pages(flags);
}
page = (struct page*)malloc(sizeof(struct page));
page->kaddr = kaddr;
page->thread = thread_current();
add_page_to_lru_list(page);
return page;
}