linux-kernel - Re: [RFC] [PATCH 0/3] Add group fairness to CFS

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Date:	Fri, 25 May 2007 18:11:41 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Guillaume Chazarain <guichaz@...oo.fr>,
	Nick Piggin <nickpiggin@...oo.com.au>, efault@....de,
	kernel@...ivas.org, containers@...ts.osdl.org,
	ckrm-tech@...ts.sourceforge.net, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, pwil3058@...pond.net.au,
	tingy@...umass.edu, tong.n.li@...el.com, wli@...omorphy.com,
	linux-kernel@...r.kernel.org, Balbir Singh <balbir@...ibm.com>
Subject: Re: [RFC] [PATCH 0/3] Add group fairness to CFS

On Fri, May 25, 2007 at 02:05:36PM +0200, Ingo Molnar wrote:
> great. Btw., could you please keep the "up to this point there should be 
> no behavioral change in CFS" fundamental splitup of your patches -

sure ..basically the changes required in CFS core is the introduction of two
structures - struct sched_entity and struct lrq and generalization of
cfs routines to operate on these structures rather than on
task_struct/rq structures directly.

In the first split, I will ensure that this generalization is applied
only to tasks (which represents reorganization of core with no
behavioral/functional change in scheduler) and in a subsequent split/patch I 
will apply the generalization to uids also (which will add group fairness 
aspect to scheduler), as you require.

Thanks for your feedback so far!

> that way i can look at the core changes (and possibly apply them) without 
> having to consider the uid based changes (which do change behavior and 
> which need more upstream buy-in).

-- 
Regards,
vatsa
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