From: Michal Hocko <mhocko@kernel.org>
To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: rientjes@google.com, hannes@cmpxchg.org, linux-mm@kvack.org
Subject: Re: [PATCH] mm, oom: Disable preemption during OOM-kill operation.
Date: Wed, 23 Sep 2015 22:23:11 +0200 [thread overview]
Message-ID: <20150923202311.GA19054@dhcp22.suse.cz> (raw)
In-Reply-To: <201509232326.JEB43777.SOFMJOVOLFFtQH@I-love.SAKURA.ne.jp>
On Wed 23-09-15 23:26:35, Tetsuo Handa wrote:
[...]
> Sprinkling preempt_{enable,disable} all around the oom path can temporarily
> slow down threads with higher priority. But doing so can guarantee that
> the oom path is not delayed indefinitely. Imagine a scenario where a task
> with idle priority called the oom path and other tasks with normal or
> realtime priority preempt. How long will we hold oom_lock and keep the
> system under oom?
What I've tried to say is that the OOM killer context might get priority
boost to make sure it makes sufficient progress. This would be much more
systematic approach IMO than sprinkling preempt_{enable,disable} all over
the place.
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2015-09-23 20:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-19 7:05 Tetsuo Handa
2015-09-22 16:55 ` Michal Hocko
2015-09-23 14:26 ` Tetsuo Handa
2015-09-23 20:23 ` Michal Hocko [this message]
2015-09-27 5:51 ` Tetsuo Handa
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