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[195.135.220.15]) by mx.google.com with ESMTPS id l17si361784edv.58.2019.04.11.11.19.47 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 11 Apr 2019 11:19:47 -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 1E593AD3E; Thu, 11 Apr 2019 18:19:47 +0000 (UTC) Date: Thu, 11 Apr 2019 20:19:46 +0200 From: Michal Hocko To: Suren Baghdasaryan Cc: Andrew Morton , David Rientjes , Matthew Wilcox , yuzhoujian@didichuxing.com, Souptick Joarder , Roman Gushchin , Johannes Weiner , Tetsuo Handa , ebiederm@xmission.com, Shakeel Butt , Christian Brauner , Minchan Kim , Tim Murray , Daniel Colascione , Joel Fernandes , Jann Horn , linux-mm , lsf-pc@lists.linux-foundation.org, LKML , kernel-team Subject: Re: [RFC 0/2] opportunistic memory reclaim of a killed process Message-ID: <20190411181946.GC10383@dhcp22.suse.cz> References: <20190411014353.113252-1-surenb@google.com> <20190411105111.GR10383@dhcp22.suse.cz> 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 09:47:31, Suren Baghdasaryan wrote: [...] > > I would question whether we really need this at all? Relying on the exit > > speed sounds like a fundamental design problem of anything that relies > > on it. > > Relying on it is wrong, I agree. There are protections like allocation > throttling that we can fall back to stop memory depletion. However > having a way to free up resources that are not needed by a dying > process quickly would help to avoid throttling which hurts user > experience. I am not opposing speeding up the exit time in general. That is a good thing. Especially for a very large processes (e.g. a DB). But I do not really think we want to expose an API to control this specific aspect. -- Michal Hocko SUSE Labs