On Thu, Jul 31, 2014 at 01:49:45PM +0200, Jerome Marchand wrote: > When memory cgoups are enabled, the code that decides to force to scan > anonymous pages in get_scan_count() compares global values (free, > high_watermark) to a value that is restricted to a memory cgroup > (file). It make the code over-eager to force anon scan. > > For instance, it will force anon scan when scanning a memcg that is > mainly populated by anonymous page, even when there is plenty of file > pages to get rid of in others memcgs, even when swappiness == 0. It > breaks user's expectation about swappiness and hurts performance. > > This patch make sure that forced anon scan only happens when there not > enough file pages for the all zone, not just in one random memcg. > > Signed-off-by: Jerome Marchand <jmarchan@xxxxxxxxxx> Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> -- 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>