linux-kernel - Re: -mm merge plans for 2.6.26 (memcgroup)

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Date:	Mon, 21 Apr 2008 19:40:23 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>, hugh@...itas.com,
	menage@...gle.com, xemul@...nvz.org, shiwh@...fujitsu.com,
	mel@....ul.ie, linux-kernel@...r.kernel.org
Subject: Re: -mm merge plans for 2.6.26 (memcgroup)

On Mon, 21 Apr 2008 15:51:21 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> >> This would enable the memory controller by default, it can be disabled
> >> using cgroup_disable=memory at boot time.
> > 
> > how about working on a runtime switch that only enables the whole
> > memcgroup machinery when an actual cgroup gets created - and disable it
> > again once the last cgroup goes.
> > 
> 
> Sounds like an interesting option to explore. I'll explore that a bit more.
> 
Maybe force_empty() will be a help for disabling ;)

- stop accountig new pages.
- calling force_empty if there are no childs.

problem is enabling.

A problem will be that we cannot account page-cache again because
it's on radix-tree when cgroup is re-enabled.


Thanks,
-Kame

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