linux-kernel - Re: [PATCH V3] nommu: add anonymous page memcg accounting

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Message-Id: <20101025091304.871c8a50.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 25 Oct 2010 09:13:04 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	steve@...idescorp.com
Cc:	linux-mm@...ck.org, balbir@...ux.vnet.ibm.com, dhowells@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] nommu: add anonymous page memcg accounting

On Fri, 22 Oct 2010 08:26:08 -0500
"Steven J. Magnani" <steve@...idescorp.com> wrote:

> On Fri, 2010-10-22 at 12:20 +0900, KAMEZAWA Hiroyuki wrote:
> > BTW, have you tried oom_notifier+NOMMU memory limit oom-killer ?
> > It may be a chance to implement a custom OOM-Killer in userland on
> > EMBEDED systems.
> 
> No - for what I need (simple sandboxing) just running my 'problem'
> process in a memory cgroup is sufficient. I might even be able to get
> away with oom_kill_allocating_task and no cgroup, but since that would
> allow dosfsck to run the system completely out of memory there's no
> guarantee that it would be the one that pushes the system over the edge.
> 
> What do you mean by "NOMMU memory limit"? (Is there some other way to
> achieve the same functionality?)
> 

I just meant memory cgroup for NOMMU.

> I looked into David's initial suggestion of using ulimit to create a
> sandbox but it seems that nommu.c doesn't respect RLIMIT_AS. When I can
> find some time I'll try to cook up a patch for that.

Hmm. I think fixing RLIMIT_AS is better. (but no nack to this patch.)
Using memcg for _a_ program sounds like overkill...

Thanks,
-Kame

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