From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: Yafang Shao <laoar.shao@gmail.com>
Cc: Michal Hocko <mhocko@kernel.org>,
David Rientjes <rientjes@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux MM <linux-mm@kvack.org>
Subject: Re: [PATCH] mm, oom: don't invoke oom killer if current has been reapered
Date: Tue, 14 Jul 2020 11:42:16 +0900 [thread overview]
Message-ID: <61feb0d9-d443-c9b8-7058-e9597af405c5@i-love.sakura.ne.jp> (raw)
In-Reply-To: <CALOAHbAdMoCHYp6eCcoeNPR6=jPc1xxGYPYZmnCrWPoTE6_QTg@mail.gmail.com>
On 2020/07/14 11:13, Yafang Shao wrote:
> But it seems the proposal that using trylock in
> mem_cgroup_out_of_memory() should be better?
> The trylock could also solve the problem that different processes are
> doing oom at the same time.
I think trylock is worse. The trylock needlessly wastes CPU time which could
have been utilized by the OOM killer/reaper for reclaiming memory.
If concurrent OOM on multiple non-overwrapping memcg domains is a real problem,
killable lock on per-memcg oom_lock will be better than trylock on global oom_lock.
next prev parent reply other threads:[~2020-07-14 2:42 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-11 3:18 [PATCH] mm, oom: don't invoke oom killer if current has been reapered Yafang Shao
2020-07-11 5:37 ` Yafang Shao
2020-07-13 6:01 ` Michal Hocko
2020-07-13 6:21 ` Michal Hocko
2020-07-13 12:24 ` Yafang Shao
2020-07-13 12:45 ` Michal Hocko
2020-07-13 13:11 ` Yafang Shao
2020-07-13 19:05 ` Michal Hocko
2020-07-14 0:15 ` Tetsuo Handa
2020-07-14 0:18 ` Tetsuo Handa
2020-07-14 2:09 ` Yafang Shao
2020-07-13 23:50 ` Tetsuo Handa
2020-07-14 2:13 ` Yafang Shao
2020-07-14 2:42 ` Tetsuo Handa [this message]
2020-07-14 2:58 ` Yafang Shao
2020-07-14 4:06 ` Tetsuo Handa
2020-07-14 5:03 ` Yafang Shao
2020-07-14 6:51 ` Michal Hocko
2020-07-14 6:43 ` Michal Hocko
2020-07-14 9:30 ` Yafang Shao
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