On Wed, Aug 14, 2013 at 12:45:41PM +0800, Xishi Qiu wrote: > A large free page buddy block will continue many times, so if the page > is free, skip the whole page buddy block instead of one page. > > Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx> page_order cannot be used unless zone->lock is held which is not held in this path. Acquiring the lock would prevent parallel allocations from the buddy allocator (per-cpu allocator would be ok except for refills). I expect it would not be a good tradeoff to acquire the lock just to use page_order. Nak. -- Mel Gorman SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>