linux-kernel - Re: [PATCH 1/2] mm, oom: introduce oom reaper

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Message-Id: <20151217120004.b5f849e1613a3a367482b379@linux-foundation.org>
Date:	Thu, 17 Dec 2015 12:00:04 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Michal Hocko <mhocko@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	David Rientjes <rientjes@...gle.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrea Argangeli <andrea@...nel.org>,
	Rik van Riel <riel@...hat.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mm, oom: introduce oom reaper

On Thu, 17 Dec 2015 11:55:11 -0800 Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Thu, Dec 17, 2015 at 5:02 AM, Michal Hocko <mhocko@...nel.org> wrote:
> > Ups. You are right. I will go with msleep_interruptible(100).
> 
> I don't think that's right.
> 
> If a signal happens, that loop is now (again) just busy-looping.

It's called only by a kernel thread so no signal_pending().  This
relationship is a bit unobvious and fragile, but we do it in quite a
few places.

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