linux-kernel - Re: [BUGFIX][PATCH] oom-kill: fix NUMA consraint check with nodemask v4.2

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Date:	Tue, 15 Dec 2009 13:43:27 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [BUGFIX][PATCH] oom-kill: fix NUMA consraint check with
 nodemask v4.2

On Mon, 14 Dec 2009 20:30:37 -0800 (PST)
David Rientjes <rientjes@...gle.com> wrote:

> On Tue, 15 Dec 2009, KAMEZAWA Hiroyuki wrote:
> 
> >     I'm now preparing more counters for mm's statistics. It's better to
> >     wait  and to see what we can do more. And other patches for total
> >     oom-killer improvement is under development.
> > 
> >     And, there is a compatibility problem.
> >     As David says, this may break some crazy software which uses
> >     fake_numa+cpuset+oom_killer+oom_adj for resource controlling.
> >    (even if I recommend them to use memcg rather than crazy tricks...)
> >     
> 
> That's not at all what I said.  I said using total_vm as a baseline allows 
> users to define when a process is to be considered "rogue," that is, using 
> more memory than expected.  Using rss would be inappropriate since it is 
> highly dynamic and depends on the state of the VM at the time of oom, 
> which userspace cannot possibly keep updated.
> 
> You consistently ignore that point: the power of /proc/pid/oom_adj to 
> influence when a process, such as a memory leaker, is to be considered as 
> a high priority for an oom kill.  It has absolutely nothing to do with 
> fake NUMA, cpusets, or memcg.
> 
You also ignore that it's not sane to use oom kill for resource control ;)

Anyway, rss patch was dropped as you want.
I'll prepare other ones.

Thanks,
-Kame

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