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

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Message-ID: <20070531054828.GB663@in.ibm.com>
Date:	Thu, 31 May 2007 11:18:28 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	William Lee Irwin III <wli@...omorphy.com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	ckrm-tech@...ts.sourceforge.net, Balbir Singh <balbir@...ibm.com>,
	efault@....de, linux-kernel@...r.kernel.org, tingy@...umass.edu,
	Peter Williams <pwil3058@...pond.net.au>, kernel@...ivas.org,
	tong.n.li@...el.com, containers@...ts.osdl.org,
	Ingo Molnar <mingo@...e.hu>, Kirill Korotaev <dev@...ru>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	Guillaume Chazarain <guichaz@...oo.fr>
Subject: Re: [ckrm-tech] [RFC] [PATCH 0/3] Add group fairness to CFS

On Wed, May 30, 2007 at 09:09:26PM -0700, William Lee Irwin III wrote:
> It's not all that tricky. 

Hmm ..the fact that each task runs for a minimum of 1 tick seems to
complicate the matters to me (when doing group fairness given a single
level hierarchy). A user with 1000 (or more) tasks can be unduly
advantaged compared to another user with just 1 (or fewer) task because of this?

> The ->fair_key computations are already
> parametrized on load weights. The "task weights" here are just what
> Linux calls "load weight," so we're largely done once task weights
> are calculated.
> 
> The tricky part (if any) is essentially what you've already got nailed
> down, that is, creating and manipulating the accounting objects for the
> task groups or whatever you're calling them.

-- 
Regards,
vatsa
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