From: Michal Hocko <mhocko@kernel.org> To: Andrew Morton <akpm@linux-foundation.org> Cc: David Rientjes <rientjes@google.com>, Johannes Weiner <hannes@cmpxchg.org>, Roman Gushchin <guro@fb.com>, Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>, linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org> Subject: Re: [PATCH 0/2] mm, oom: do not grant oom victims full memory reserves access Date: Tue, 1 Aug 2017 14:16:44 +0200 [thread overview] Message-ID: <20170801121643.GI15774@dhcp22.suse.cz> (raw) In-Reply-To: <20170727090357.3205-1-mhocko@kernel.org> On Thu 27-07-17 11:03:55, Michal Hocko wrote: > Hi, > this is a part of a larger series I posted back in Oct last year [1]. I > have dropped patch 3 because it was incorrect and patch 4 is not > applicable without it. > > The primary reason to apply patch 1 is to remove a risk of the complete > memory depletion by oom victims. While this is a theoretical risk right > now there is a demand for memcg aware oom killer which might kill all > processes inside a memcg which can be a lot of tasks. That would make > the risk quite real. > > This issue is addressed by limiting access to memory reserves. We no > longer use TIF_MEMDIE to grant the access and use tsk_is_oom_victim > instead. See Patch 1 for more details. Patch 2 is a trivial follow up > cleanup. Any comments, concerns? Can we merge it? > I would still like to get rid of TIF_MEMDIE completely but I do not have > time to do it now and it is not a pressing issue. > > [1] http://lkml.kernel.org/r/20161004090009.7974-1-mhocko@kernel.org -- Michal Hocko SUSE Labs
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From: Michal Hocko <mhocko@kernel.org> To: Andrew Morton <akpm@linux-foundation.org> Cc: David Rientjes <rientjes@google.com>, Johannes Weiner <hannes@cmpxchg.org>, Roman Gushchin <guro@fb.com>, Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>, linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org> Subject: Re: [PATCH 0/2] mm, oom: do not grant oom victims full memory reserves access Date: Tue, 1 Aug 2017 14:16:44 +0200 [thread overview] Message-ID: <20170801121643.GI15774@dhcp22.suse.cz> (raw) In-Reply-To: <20170727090357.3205-1-mhocko@kernel.org> On Thu 27-07-17 11:03:55, Michal Hocko wrote: > Hi, > this is a part of a larger series I posted back in Oct last year [1]. I > have dropped patch 3 because it was incorrect and patch 4 is not > applicable without it. > > The primary reason to apply patch 1 is to remove a risk of the complete > memory depletion by oom victims. While this is a theoretical risk right > now there is a demand for memcg aware oom killer which might kill all > processes inside a memcg which can be a lot of tasks. That would make > the risk quite real. > > This issue is addressed by limiting access to memory reserves. We no > longer use TIF_MEMDIE to grant the access and use tsk_is_oom_victim > instead. See Patch 1 for more details. Patch 2 is a trivial follow up > cleanup. Any comments, concerns? Can we merge it? > I would still like to get rid of TIF_MEMDIE completely but I do not have > time to do it now and it is not a pressing issue. > > [1] http://lkml.kernel.org/r/20161004090009.7974-1-mhocko@kernel.org -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2017-08-01 12:16 UTC|newest] Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-07-27 9:03 [PATCH 0/2] mm, oom: do not grant oom victims full memory reserves access Michal Hocko 2017-07-27 9:03 ` Michal Hocko 2017-07-27 9:03 ` [PATCH 1/2] mm, oom: do not rely on TIF_MEMDIE for " Michal Hocko 2017-07-27 9:03 ` Michal Hocko 2017-08-01 15:30 ` Tetsuo Handa 2017-08-01 15:30 ` Tetsuo Handa 2017-08-01 16:52 ` Michal Hocko 2017-08-01 16:52 ` Michal Hocko 2017-08-02 6:10 ` Michal Hocko 2017-08-02 6:10 ` Michal Hocko 2017-08-03 1:39 ` Tetsuo Handa 2017-08-03 1:39 ` Tetsuo Handa 2017-08-03 7:06 ` Michal Hocko 2017-08-03 7:06 ` Michal Hocko 2017-08-03 8:03 ` Tetsuo Handa 2017-08-03 8:03 ` Tetsuo Handa 2017-08-03 8:21 ` Michal Hocko 2017-08-03 8:21 ` Michal Hocko 2017-08-02 8:29 ` [PATCH v2 " Michal Hocko 2017-08-02 8:29 ` Michal Hocko 2017-08-03 9:37 ` Mel Gorman 2017-08-03 9:37 ` Mel Gorman 2017-08-03 11:00 ` Michal Hocko 2017-08-03 11:00 ` Michal Hocko 2017-08-03 12:22 ` Mel Gorman 2017-08-03 12:22 ` Mel Gorman 2017-07-27 9:03 ` [PATCH 2/2] mm: replace TIF_MEMDIE checks by tsk_is_oom_victim Michal Hocko 2017-07-27 9:03 ` Michal Hocko 2017-07-27 14:01 ` Tetsuo Handa 2017-07-27 14:01 ` Tetsuo Handa 2017-07-27 14:08 ` Tetsuo Handa 2017-07-27 14:08 ` Tetsuo Handa 2017-07-27 14:18 ` Michal Hocko 2017-07-27 14:18 ` Michal Hocko 2017-07-27 14:45 ` Michal Hocko 2017-07-27 14:45 ` Michal Hocko 2017-07-27 14:55 ` Roman Gushchin 2017-07-27 14:55 ` Roman Gushchin 2017-07-29 8:33 ` kbuild test robot 2017-07-31 6:46 ` Michal Hocko 2017-07-31 6:46 ` Michal Hocko 2017-08-01 12:16 ` Michal Hocko [this message] 2017-08-01 12:16 ` [PATCH 0/2] mm, oom: do not grant oom victims full memory reserves access Michal Hocko 2017-08-01 12:23 ` Roman Gushchin 2017-08-01 12:23 ` Roman Gushchin 2017-08-01 12:29 ` Michal Hocko 2017-08-01 12:29 ` Michal Hocko 2017-08-01 12:42 ` Roman Gushchin 2017-08-01 12:42 ` Roman Gushchin 2017-08-01 12:54 ` Michal Hocko 2017-08-01 12:54 ` Michal Hocko 2017-08-07 14:21 ` Michal Hocko 2017-08-07 14:21 ` Michal Hocko
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