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From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: David Rientjes <rientjes@google.com>
Cc: Michal Hocko <mhocko@kernel.org>,
	Robert Kolchmeyer <rkolchmeyer@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Vlastimil Babka <vbabka@suse.cz>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [patch] mm, oom: make a last minute check to prevent unnecessary memcg oom kills
Date: Wed, 11 Mar 2020 20:41:45 +0900	[thread overview]
Message-ID: <54d56b12-3f75-1382-cc12-a8e63e24ce1f@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <alpine.DEB.2.21.2003101547090.177273@chino.kir.corp.google.com>

On 2020/03/11 7:54, David Rientjes wrote:
> The patch certainly prevents unnecessary oom kills when there is a pending 
> victim that uncharges its memory between invoking the oom killer and 
> finding MMF_OOM_SKIP in the list of eligible tasks and its much more 
> common on systems with limited cpu cores.

I think that it is dump_header() which currently spends much time (due to
synchronous printing) enough to make "the second memcg oom kill shows usage
is >40MB below its limit of 100MB" happen. Shouldn't we call dump_header()
and then do the last check and end with "but did not kill anybody" message?

  parent reply	other threads:[~2020-03-11 11:42 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-10 21:55 David Rientjes
2020-03-10 22:19 ` Michal Hocko
2020-03-10 22:54   ` David Rientjes
2020-03-11  8:39     ` Michal Hocko
2020-03-17  7:59       ` Michal Hocko
2020-03-11 11:41     ` Tetsuo Handa [this message]
2020-03-11 19:51       ` David Rientjes
2020-03-17 18:25     ` Robert Kolchmeyer
2020-03-17 19:00       ` Ami Fischman
2020-03-18  9:57         ` Michal Hocko
2020-03-18 15:20           ` Ami Fischman
2020-03-18  9:55       ` Michal Hocko

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