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[195.135.220.15]) by mx.google.com with ESMTPS id c18si7717183ejo.102.2019.04.11.05.16.38 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 11 Apr 2019 05:16:38 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 80279AC4C; Thu, 11 Apr 2019 12:16:37 +0000 (UTC) Date: Thu, 11 Apr 2019 14:16:33 +0200 From: Michal Hocko To: Rik van Riel Cc: Suren Baghdasaryan , akpm@linux-foundation.org, dancol@google.com, jannh@google.com, minchan@kernel.org, penguin-kernel@I-love.SAKURA.ne.jp, kernel-team@android.com, rientjes@google.com, linux-kernel@vger.kernel.org, willy@infradead.org, linux-mm@kvack.org, hannes@cmpxchg.org, shakeelb@google.com, jrdr.linux@gmail.com, yuzhoujian@didichuxing.com, joel@joelfernandes.org, timmurray@google.com, lsf-pc@lists.linux-foundation.org, guro@fb.com, christian@brauner.io, ebiederm@xmission.com Subject: Re: [Lsf-pc] [RFC 0/2] opportunistic memory reclaim of a killed process Message-ID: <20190411121633.GV10383@dhcp22.suse.cz> References: <20190411014353.113252-1-surenb@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu 11-04-19 07:51:21, Rik van Riel wrote: > On Wed, 2019-04-10 at 18:43 -0700, Suren Baghdasaryan via Lsf-pc wrote: > > The time to kill a process and free its memory can be critical when > > the > > killing was done to prevent memory shortages affecting system > > responsiveness. > > The OOM killer is fickle, and often takes a fairly > long time to trigger. Speeding up what happens after > that seems like the wrong thing to optimize. > > Have you considered using something like oomd to > proactively kill tasks when memory gets low, so > you do not have to wait for an OOM kill? AFAIU, this is the point here. They probably have a user space OOM killer implementation and want to achieve killing to be as swift as possible. -- Michal Hocko SUSE Labs