linux-kernel - Re: containers (was Re: -mm merge plans for 2.6.23)

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Message-ID: <20070711045516.GH2927@linux.vnet.ibm.com>
Date:	Wed, 11 Jul 2007 10:25:16 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Paul Menage" <menage@...gle.com>, linux-kernel@...r.kernel.org,
	containers@...ts.osdl.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: containers (was Re: -mm merge plans for 2.6.23)

On Tue, Jul 10, 2007 at 11:53:19AM -0700, Andrew Morton wrote:
> On Tue, 10 Jul 2007 11:34:38 -0700
> "Paul Menage" <menage@...gle.com> wrote:
> 
> > Andrew, how about we merge enough of the container framework to
> > support CFS? Bits we could leave out for now include container_clone()
> > support and the nsproxy subsystem, fork/exit callback hooks, and
> > possibly leave cpusets alone for now (which would also mean we could
> > skip the automatic release-agent stuff). I'm in Tokyo for the Linux
> > Foundation Japan symposium right now, but I should be able to get the
> > new patchset to you for Friday afternoon.
> 
> mm..  Given that you propose leaving bits out for the 2.6.23 merge, and
> that changes are still pending and that nothing will _use_ the framework in
> 2.6.23 [...]

Andrew,
	The cpu group scheduler is ready and waiting for the container patches 
in 2.6.23 :)

Here are some options with us:

	a. (As Paul says) merge enough of container patches to enable
	   its use with cfs group scheduler (and possibly cpusets?)

	b. Enable group scheduling bits in 2.6.23 using the user-id grouping 
	   mechanism (aka fair user scheduler). For 2.6.24, we could remove 
	   this interface and use Paul's container patches instead. Since this 
	   means change of API interface between 2.6.23 and 2.6.24, I don't 
	   prefer this option.

	c. Enable group scheduling bits only in -mm for now (2.6.23-mmX), using 
	   Paul's container patches. I can send you a short patch that hooks up 
	   cfs group scheduler with Paul's container infrastructure.

If a. is not possible, I would prefer c.

Let me know your thoughts ..

-- 
Regards,
vatsa
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