linux-kernel - Re: [patch v2 -mm] mm, oom: prefer thread group leaders for display purposes

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Message-ID: <alpine.DEB.2.02.1401161447510.31228@chino.kir.corp.google.com>
Date:	Thu, 16 Jan 2014 14:49:25 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Michal Hocko <mhocko@...e.cz>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	cgroups@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch v2 -mm] mm, oom: prefer thread group leaders for display
 purposes

On Thu, 16 Jan 2014, Michal Hocko wrote:

> > When two threads have the same badness score, it's preferable to kill the 
> > thread group leader so that the actual process name is printed to the 
> > kernel log rather than the thread group name which may be shared amongst 
> > several processes.
> 
> I am not sure I understand this. Is this about ->comm? If yes then why
> couldn't the group leader do PR_SET_NAME?
> 

Both comm and pid, we only display thread group leaders in the tasklist 
dump of eligible processes, we want the killed message to specify from 
which process.

You're suggesting a thread group leader do PR_SET_NAME of all its threads 
for readable oom killer output?  Lol.
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