linux-kernel - Re: [ckrm-tech] [PATCH 1/1] Fix a panic while mouting containers on powerpc and some other small cleanups (Re: [PATCH 4/6] containers: Simple CPU accounting container subsystem)

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Date:	Mon, 15 Jan 2007 02:01:19 -0800
From:	"Paul Menage" <menage@...gle.com>
To:	balbir@...ibm.com
Cc:	vatsa@...ibm.com, sekharan@...ibm.com,
	ckrm-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	xemul@...ru, dev@...ru, containers@...ts.osdl.org, pj@....com,
	mbligh@...gle.com, winget@...gle.com, rohitseth@...gle.com,
	serue@...ibm.com, devel@...nvz.org
Subject: Re: [ckrm-tech] [PATCH 1/1] Fix a panic while mouting containers on powerpc and some other small cleanups (Re: [PATCH 4/6] containers: Simple CPU accounting container subsystem)

On 1/15/07, Balbir Singh <balbir@...ibm.com> wrote:
>
> While writing/extending the cpuacct container, I found it useful to
> know if the container resource group we are controlling is really mounted.
> Controllers can try and avoid doing work when not mounted and start
> when the subsystem is mounted. Also, without these callbacks, one has no
> definite way of checking if the top_container is dummy or for real.
>

That's somewhat intentional - my aim was that the controllers
shouldn't really care whether they're connected to the default
hierarchy or have been bound to some mounted hierarchy. Having said
thay, they can determine it by checking <foo>_subsys.hierarchy if they
really want to. If that's 0 then they're in the default hierarchy (and
can assume that all tasks are in one top-level container).

Paul
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