From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: Michal Hocko <mhocko@kernel.org>, Tejun Heo <tj@kernel.org>
Cc: Roman Gushchin <guro@fb.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Vladimir Davydov <vdavydov.dev@gmail.com>,
David Rientjes <rientjes@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm,page_alloc: PF_WQ_WORKER threads must sleep at should_reclaim_retry().
Date: Tue, 31 Jul 2018 06:01:48 +0900 [thread overview]
Message-ID: <6f433d59-4a56-b698-e119-682bb8bf6713@i-love.sakura.ne.jp> (raw)
In-Reply-To: <20180730191005.GC24267@dhcp22.suse.cz>
On 2018/07/31 4:10, Michal Hocko wrote:
> Since should_reclaim_retry() should be a natural reschedule point,
> let's do the short sleep for PF_WQ_WORKER threads unconditionally in
> order to guarantee that other pending work items are started. This will
> workaround this problem and it is less fragile than hunting down when
> the sleep is missed. E.g. we used to have a sleeping point in the oom
> path but this has been removed recently because it caused other issues.
> Having a single sleeping point is more robust.
linux.git has not removed the sleeping point in the OOM path yet. Since removing the
sleeping point in the OOM path can mitigate CVE-2016-10723, please do so immediately.
(And that change will conflict with Roman's cgroup aware OOM killer patchset. But it
should be easy to rebase.)
next prev parent reply other threads:[~2018-07-30 21:02 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-26 11:06 Tetsuo Handa
2018-07-26 11:39 ` Michal Hocko
2018-07-27 15:47 ` Tetsuo Handa
2018-07-30 9:32 ` Michal Hocko
2018-07-30 14:34 ` Tetsuo Handa
2018-07-30 14:46 ` Michal Hocko
2018-07-30 14:54 ` Tejun Heo
2018-07-30 15:25 ` Tetsuo Handa
2018-07-30 15:44 ` Tejun Heo
2018-07-30 18:51 ` Michal Hocko
2018-07-30 19:10 ` Michal Hocko
2018-07-30 21:01 ` Tetsuo Handa [this message]
2018-07-31 5:09 ` Michal Hocko
2018-07-31 10:47 ` Tetsuo Handa
2018-07-31 11:15 ` Michal Hocko
2018-07-31 11:30 ` Tetsuo Handa
2018-07-31 11:55 ` Michal Hocko
2018-08-02 22:05 ` Tetsuo Handa
2018-08-03 6:16 ` Michal Hocko
2018-08-21 21:07 ` Tetsuo Handa
2018-08-22 7:32 ` Michal Hocko
2018-08-23 20:06 ` David Rientjes
2018-08-23 21:00 ` Tetsuo Handa
2018-08-23 22:45 ` David Rientjes
2018-08-24 0:31 ` Tetsuo Handa
2018-09-05 13:20 ` Tetsuo Handa
2018-09-05 13:40 ` Michal Hocko
2018-09-05 13:53 ` Tetsuo Handa
2018-09-05 14:04 ` Michal Hocko
2018-09-06 1:00 ` Tetsuo Handa
2018-09-06 5:57 ` Michal Hocko
2018-09-06 6:22 ` Tetsuo Handa
2018-09-06 7:03 ` Tetsuo Handa
2018-07-30 19:14 ` Tejun Heo
2018-08-27 13:51 Michal Hocko
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