From mboxrd@z Thu Jan 1 00:00:00 1970 From: Johannes Weiner Subject: Re: [patch -mm v2 2/3] mm, memcg: replace cgroup aware oom killer mount option with tunable Date: Tue, 30 Jan 2018 12:30:17 -0500 Message-ID: <20180130173017.GA24827@cmpxchg.org> References: <20180126143950.719912507bd993d92188877f@linux-foundation.org> <20180126161735.b999356fbe96c0acd33aaa66@linux-foundation.org> <20180129104657.GC21609@dhcp22.suse.cz> <20180129191139.GA1121507@devbig577.frc2.facebook.com> <20180130085445.GQ21609@dhcp22.suse.cz> <20180130115846.GA4720@castle.DHCP.thefacebook.com> <20180130120852.GA21609@dhcp22.suse.cz> <20180130121315.GA5888@castle.DHCP.thefacebook.com> <20180130122011.GB21609@dhcp22.suse.cz> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=cmpxchg.org ; s=x; h=In-Reply-To:Content-Type:MIME-Version:References:Message-ID:Subject: Cc:To:From:Date:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=1Kv58h41sA/Yec7UcQgklDa+pzSbHAWj0raJH6Z25gk=; b=ZCB9hyRyEUrt2sPT4jBeRCr9S1 D/yTI3YvTdOapedyxCN0IAoTQQM5TbHQUZ91UVCMcAKcx1WcD5G8gIxS2W3u0J1bHSXUe6I9ukPaI AA+FUNlyvljYLWp5dTCAhw6OwPwW19jIEkK6Aq00lWKnJqbjaEl+5jzjenK8z0f1wbxM=; Content-Disposition: inline In-Reply-To: <20180130122011.GB21609-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org> Sender: cgroups-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Michal Hocko Cc: Roman Gushchin , Tejun Heo , Andrew Morton , David Rientjes , Vladimir Davydov , Tetsuo Handa , kernel-team-b10kYP2dOMg@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org On Tue, Jan 30, 2018 at 01:20:11PM +0100, Michal Hocko wrote: > From 361275a05ad7026b8f721f8aa756a4975a2c42b1 Mon Sep 17 00:00:00 2001 > From: Michal Hocko > Date: Tue, 30 Jan 2018 09:54:15 +0100 > Subject: [PATCH] oom, memcg: clarify root memcg oom accounting > > David Rientjes has pointed out that the current way how the root memcg > is accounted for the cgroup aware OOM killer is undocumented. Unlike > regular cgroups there is no accounting going on in the root memcg > (mostly for performance reasons). Therefore we are suming up oom_badness > of its tasks. This might result in an over accounting because of the > oom_score_adj setting. Document this for now. > > Acked-by: Roman Gushchin > Signed-off-by: Michal Hocko Acked-by: Johannes Weiner