From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: mhocko@kernel.org
Cc: mjaggi@caviumnetworks.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: Possible race condition in oom-killer
Date: Tue, 1 Aug 2017 23:16:13 +0900 [thread overview]
Message-ID: <201708012316.CFF21387.VMFtLFJHFOQOOS@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <20170801121411.GG15774@dhcp22.suse.cz>
Michal Hocko wrote:
> Once we merge [1] then the oom victim wouldn't
> need to get TIF_MEMDIE to access memory reserves.
>
> [1] http://lkml.kernel.org/r/20170727090357.3205-2-mhocko@kernel.org
False. We are not setting oom_mm to all thread groups (!CLONE_THREAD) sharing
that mm (CLONE_VM). Thus, one thread from each thread group sharing that mm
will have to call out_of_memory() in order to set oom_mm, and they will find
task_will_free_mem() returning false due to MMF_OOM_SKIP already set, and
after all goes to next OOM victim selection.
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next prev parent reply other threads:[~2017-08-01 14:16 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <e6c83a26-1d59-4afd-55cf-04e58bdde188@caviumnetworks.com>
2017-07-28 12:32 ` Michal Hocko
2017-07-28 12:59 ` Tetsuo Handa
2017-07-28 13:07 ` Michal Hocko
2017-07-28 13:15 ` Tetsuo Handa
2017-07-28 13:29 ` Michal Hocko
2017-07-28 13:55 ` Tetsuo Handa
2017-07-28 14:07 ` Michal Hocko
2017-07-29 4:31 ` Tetsuo Handa
2017-08-01 12:14 ` Michal Hocko
2017-08-01 14:16 ` Tetsuo Handa [this message]
2017-08-01 14:47 ` Michal Hocko
2017-08-01 10:46 ` Tetsuo Handa
2017-08-01 11:30 ` Michal Hocko
2017-07-28 13:15 ` Manish Jaggi
2017-07-28 13:50 ` Manish Jaggi
2017-07-28 14:12 ` Michal Hocko
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