On Wed, 5 Jun 2013, KOSAKI Motohiro wrote: > (6/5/13 11:10 AM), Andrea Arcangeli wrote: > > Zone reclaim locked breaks zone_reclaim_mode=1. If more than one > > thread allocates memory at the same time, it forces a premature > > allocation into remote NUMA nodes even when there's plenty of clean > > cache to reclaim in the local nodes. > > > > Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx> > > You should Christoph Lameter who make this lock. I've CCed. I couldn't > find any problem in this removing. But I also didn't find a reason why > this lock is needed. There was early on an issue with multiple zone reclaims from different processors causing an extreme slowdown and the system would go OOM. The flag was used to enforce that only a single zone reclaim pass was occurring at one time on a zone. This minimized contention and avoided the failure. -- 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>