linux-kernel - Re: [patch] mm, memcg: add memory.oom_control notification for system oom

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Message-ID: <20131118231506.32ec2467@alan.etchedpixels.co.uk>
Date:	Mon, 18 Nov 2013 23:15:06 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	cgroups@...r.kernel.org
Subject: Re: [patch] mm, memcg: add memory.oom_control notification for
 system oom

> And accessing the emergency reserves means we are definitely no longer
> A-OK, this is not comparable to the first direct reclaim invocation.
> 
> We exhausted our options and we got really lucky.  It should not be
> considered the baseline and a user listening for "OOM conditions"
> should be informed about this.

Definitely concur - there are loading tuning cases where you want to
drive the box to the point it starts whining and then scale back a touch.

It's an API change in effect, and while I can believe there are good
arguments for both any API change ought to be a new API for listening
only to serious OOM cases.
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