On Wed, Jul 13, 2011 at 03:31:27PM +0100, Mel Gorman wrote: > It is preferable that no dirty pages are dispatched from the page > reclaim path. If reclaim is encountering dirty pages, it implies that > either reclaim is getting ahead of writeback or use-once logic has > prioritise pages for reclaiming that are young relative to when the > inode was dirtied. what does this buy us? If at all we should prioritize by a zone, e.g. tell write_cache_pages only to bother with writing things out if the dirty page is in a given zone. We'd probably still cluster around it to make sure we get good I/O patterns, but would only start I/O if it has a page we actually care about. -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>