linux-kernel - Re: [patch 1/2] mm, memcg: avoid oom notification when current needs access to memory reserves

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Message-ID: <alpine.DEB.2.02.1312101655430.22701@chino.kir.corp.google.com>
Date:	Tue, 10 Dec 2013 17:03:45 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Michal Hocko <mhocko@...e.cz>
cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	cgroups@...r.kernel.org
Subject: Re: [patch 1/2] mm, memcg: avoid oom notification when current needs
 access to memory reserves

On Tue, 10 Dec 2013, Michal Hocko wrote:

> > What exactly would you like to see?
> 
> How often do you see PF_EXITING tasks which haven't been killed causing
> a pointless notification? Because fatal_signal_pending and TIF_MEMDIE
> cases are already handled because we bypass charges in those cases (except
> for user OOM killer killed tasks which don't get TIF_MEMDIE and that
> should be fixed).
> 

Triggering a pointless notification with PF_EXITING is rare, yet one 
pointless notification can be avoided with the patch.  Additionally, it 
also avoids a pointless notification for a racing SIGKILL.
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