On Fri, Feb 17, 2012 at 06:26:51PM +0900, KAMEZAWA Hiroyuki wrote: > >From 62a96c625be0c30fc5828d88685b6873ed254060 Mon Sep 17 00:00:00 2001 > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> > Date: Thu, 2 Feb 2012 11:49:59 +0900 > Subject: [PATCH 3/6] memcg: remove PCG_MOVE_LOCK flag from page_cgroup. > > PCG_MOVE_LOCK is used for bit spinlock to avoid race between overwriting > pc->mem_cgroup and page statistics accounting per memcg. > This lock helps to avoid the race but the race is very rare because moving > tasks between cgroup is not a usual job. > So, it seems using 1bit per page is too costly. > > This patch changes this lock as per-memcg spinlock and removes PCG_MOVE_LOCK. > > If smaller lock is required, we'll be able to add some hashes but > I'd like to start from this. > > Changelog: > - fixed to pass memcg as an argument rather than page_cgroup. > and renamed from move_lock_page_cgroup() to move_lock_mem_cgroup() > > Acked-by: Greg Thelen <gthelen@xxxxxxxxxx> > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>