linux-kernel - Re: [RFC v5 PATCH 0/8] CFS Hard limits

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Date:	Tue, 2 Feb 2010 13:27:16 +0530
From:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
To:	Paul Turner <pjt@...gle.com>
Cc:	Bharata B Rao <bharata.rao@...il.com>,
	linux-kernel@...r.kernel.org,
	Dhaval Giani <dhaval.giani@...il.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Herbert Poetzl <herbert@...hfloor.at>,
	Avi Kivity <avi@...hat.com>,
	Chris Friesen <cfriesen@...tel.com>,
	Paul Menage <menage@...gle.com>,
	Mike Waychison <mikew@...gle.com>
Subject: Re: [RFC v5 PATCH 0/8] CFS Hard limits - v5

On Mon, Feb 01, 2010 at 11:13:42PM -0800, Paul Turner wrote:
> 
> I'm really glad that we're having this discussion however it feels
> like we are rat-holing a little on the handling of slack?  As an issue

That's because runtime rebalancing was one of the main the issues you
brought up.

> it seems a non-starter since if necessary it can be scrubbed with the
> same overhead as the original proposal for period refresh (i.e. remove
> slack from each cpu).  There are also trivial faster ways to zero it
> without this O(n) overhead.
> 
> I feel it would be more productive to focus discussion on other areas
> of design such as load balancer interaction, distribution from global
> to local pools, entity placement and fairness on wakeup, etc.

Sure, as I said looking forward to your patches!
Discussions/reviews on those aspects were hardly forthcoming during
my earlier posts. Hopefully we will see more review/discussions in future.

> 
> > Regards,
> > Bharata.
> >
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