From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kamezawa Hiroyuki Subject: Re: [PATCH] memcg: implement boost mode Date: Mon, 01 Apr 2013 18:27:45 +0900 Message-ID: <51595311.7070509@jp.fujitsu.com> References: <1364801670-10241-1-git-send-email-glommer@parallels.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1364801670-10241-1-git-send-email-glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org> Sender: cgroups-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" To: Glauber Costa Cc: linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, Michal Hocko , Johannes Weiner , Andrew Morton , cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Tejun Heo (2013/04/01 16:34), Glauber Costa wrote: > There are scenarios in which we would like our programs to run faster. > It is a hassle, when they are contained in memcg, that some of its > allocations will fail and start triggering reclaim. This is not good > for the program, that will now be slower. > > This patch implements boost mode for memcg. It exposes a u64 file > "memcg boost". Every time you write anything to it, it will reduce the > counters by ~20 %. Note that we don't want to actually reclaim pages, > which would defeat the very goal of boost mode. We just make the > res_counters able to accomodate more. > > This file is also available in the root cgroup. But with a slightly > different effect. Writing to it will make more memory physically > available so our programs can profit. > > Please ack and apply. > Nack. > Signed-off-by: Glauber Costa Please update limit temporary. If you need call-shrink-explicitly-by-user, I think you can add it. Thanks, -Kame