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[37.188.148.171]) by smtp.gmail.com with ESMTPSA id t4sm2996888wmf.4.2020.07.13.23.51.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Jul 2020 23:51:21 -0700 (PDT) Date: Tue, 14 Jul 2020 08:51:20 +0200 From: Michal Hocko To: Tetsuo Handa Cc: Yafang Shao , David Rientjes , Andrew Morton , Linux MM Subject: Re: [PATCH] mm, oom: don't invoke oom killer if current has been reapered Message-ID: <20200714065120.GC24642@dhcp22.suse.cz> References: <1594437481-11144-1-git-send-email-laoar.shao@gmail.com> <06806cf0-a122-e002-191f-348298358882@i-love.sakura.ne.jp> <61feb0d9-d443-c9b8-7058-e9597af405c5@i-love.sakura.ne.jp> <9b9c8510-1a1d-86b0-59ce-29992a53d52c@i-love.sakura.ne.jp> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9b9c8510-1a1d-86b0-59ce-29992a53d52c@i-love.sakura.ne.jp> X-Rspamd-Queue-Id: 7BBAE16A0DD X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 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 Tue 14-07-20 13:06:48, Tetsuo Handa wrote: > On 2020/07/14 11:58, Yafang Shao wrote: [...] > > But I find that we doesn't sched it out in pagefault path, > > > > pagefault_out_of_memory > > if (!mutex_trylock(&oom_lock)) > > return; > > > > I haven't thought deeply what the difference is ... > > David Rientjes is proposing it for avoiding soft lockup, and Michal Hocko is refusing it. > How to give the OOM killer/reaper enough CPU time for reclaiming memory is a dogfight. :-( > > https://lkml.kernel.org/r/alpine.DEB.2.21.2003181458100.70237@chino.kir.corp.google.com I believe there was a review feedback to be addressed and never followed up. -- Michal Hocko SUSE Labs