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[209.85.220.65]) by mx.google.com with SMTPS id x19sor14145443wrd.13.2019.04.11.09.54.21 for (Google Transport Security); Thu, 11 Apr 2019 09:54:21 -0700 (PDT) Received-SPF: pass (google.com: domain of surenb@google.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=fNWDni2W; spf=pass (google.com: domain of surenb@google.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=surenb@google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Otu8oQ57F7UNmqh12Qrt5qvVebAwqh7zepUUOR2psCw=; b=fNWDni2WBHljHOFUUJspzmpa63RWuYdVIS0I3zOyBS2lLLO6KySQ51cmWNiO7hc2Zl ECt/C5Ky670bJQ5Y/0J0LhOCfc0Lt2Iwpob0TZ7SIP5kv9C9NNRB1wStqN/N2tYLuIKw wZg0KFFK27GJ1pbKVFkdVwDqOyreBFZk/jafrt6UExSb4bI4BAkAjcPUss8hpIGyWHct 5ikRIfAdd9LNMlN4QIMJoanmN2oiEoSZWVAINnP8ESOpbf1mzxDB7iVXd9gmjJZUG9zF Ju866VB9mBqZkVotHQnuvZKKWpWRfOzBfvhObdATWC3h+6KUBTdrH/MXs5IMpClUYU84 G7mQ== X-Google-Smtp-Source: APXvYqwj1boQo/nBHeqnGk+RcSMgv151Qay/U+p6/XYdYT7weeYhs8WiIbKmtBlUigIKITxE7cnT6zBNx7yHx2o6yRk= X-Received: by 2002:adf:cf0c:: with SMTP id o12mr12832082wrj.16.1555001660732; Thu, 11 Apr 2019 09:54:20 -0700 (PDT) MIME-Version: 1.0 References: <20190411014353.113252-1-surenb@google.com> <20190411121633.GV10383@dhcp22.suse.cz> In-Reply-To: <20190411121633.GV10383@dhcp22.suse.cz> From: Suren Baghdasaryan Date: Thu, 11 Apr 2019 09:54:09 -0700 Message-ID: Subject: Re: [Lsf-pc] [RFC 0/2] opportunistic memory reclaim of a killed process To: Michal Hocko Cc: Rik van Riel , Suren Baghdasaryan , Andrew Morton , Daniel Colascione , Jann Horn , Minchan Kim , Tetsuo Handa , kernel-team , David Rientjes , LKML , Matthew Wilcox , linux-mm , Johannes Weiner , Shakeel Butt , Souptick Joarder , yuzhoujian@didichuxing.com, Joel Fernandes , Tim Murray , lsf-pc@lists.linux-foundation.org, Roman Gushchin , Christian Brauner , ebiederm@xmission.com Content-Type: text/plain; charset="UTF-8" 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, Apr 11, 2019 at 5:16 AM Michal Hocko wrote: > > 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. That is correct. Android has a userspace daemon called lmkd (low memory killer daemon) to respond to memory pressure before things get bad enough for kernel oom-killer to get involved. So this asynchronous reclaim optimization would allow lmkd do its job more efficiently. > -- > Michal Hocko > SUSE Labs > > -- > You received this message because you are subscribed to the Google Groups "kernel-team" group. > To unsubscribe from this group and stop receiving emails from it, send an email to kernel-team+unsubscribe@android.com. >