From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vladimir Davydov Subject: Re: [PATCH 3/4] memcg: punt high overage reclaim to return-to-userland path Date: Sat, 29 Aug 2015 10:59:05 +0300 Message-ID: <20150829075905.GO9610@esperanza> References: <1440775530-18630-1-git-send-email-tj@kernel.org> <1440775530-18630-4-git-send-email-tj@kernel.org> <20150828163611.GI9610@esperanza> <20150828164819.GL26785@mtj.duckdns.org> <20150828203231.GL9610@esperanza> <20150828204432.GA11089@htj.dyndns.org> <20150828220632.GF11089@htj.dyndns.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Return-path: Content-Disposition: inline In-Reply-To: <20150828220632.GF11089-Gd/HAXX7CRxy/B6EtB590w@public.gmane.org> Sender: cgroups-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Transfer-Encoding: 7bit To: Tejun Heo Cc: Andrew Morton , hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org, mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, kernel-team-b10kYP2dOMg@public.gmane.org, Joonsoo Kim , Christoph Lameter , David Rientjes On Fri, Aug 28, 2015 at 06:06:32PM -0400, Tejun Heo wrote: > On Fri, Aug 28, 2015 at 04:44:32PM -0400, Tejun Heo wrote: > > Ah, cool, so it was a bug from slub. Punting to return path still has > > some niceties but if we can't consistently get rid of stack > > consumption it's not that attractive. Let's revisit it later together > > with hard limit reclaim. > > So, I can't check right now but I'm pretty sure I was using SLAB on my > test config, so this issue may exist there too. Yeah, SLAB is broken too. It was accidentally broken by commit 4167e9b2cf10 ("mm: remove GFP_THISNODE"), which among other things made SLAB filter out __GFP_WAIT from gfp flags when probing a NUMA node. I'll take a look what we can do with that. Thanks, Vladimir