On Mon, Jul 19, 2010 at 02:11:29PM +0100, Mel Gorman wrote: > From: Wu Fengguang <fengguang.wu@xxxxxxxxx> > > A background flush work may run for ever. So it's reasonable for it to > mimic the kupdate behavior of syncing old/expired inodes first. > > This behavior also makes sense from the perspective of page reclaim. > File pages are added to the inactive list and promoted if referenced > after one recycling. If not referenced, it's very easy for pages to be > cleaned from reclaim context which is inefficient in terms of IO. If > background flush is cleaning pages, it's best it cleans old pages to > help minimise IO from reclaim. Yes, we absolutely do this. Wu, do you have an improved version of the pending or should we put it in this version for now? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>