linux-kernel - Re: Migrated CFS task getting an unfair advantage

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Message-ID: <20160309192117.GN6344@twins.programming.kicks-ass.net>
Date:	Wed, 9 Mar 2016 20:21:17 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andrew Hunter <ahh@...gle.com>
Cc:	pavankumar kondeti <pavankumar.kondeti@...il.com>,
	Pavan Kondeti <pkondeti@...eaurora.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Ingo Molnar <mingo@...nel.org>, Paul Turner <pjt@...gle.com>,
	Ben Segall <bsegall@...gle.com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Morten Rasmussen <morten.rasmussen@....com>,
	byungchul.park@....com
Subject: Re: Migrated CFS task getting an unfair advantage

On Wed, Mar 09, 2016 at 11:00:42AM -0800, Andrew Hunter wrote:
> At Google, we essentially reverted 88ec22d and the subsequent tweaks
> to it, keeping vruntime absolute always , instead using
> task_move_group_fair to change the basis of relative min_vruntime
> between cpus.  We found this made it a lot easier to reason about and
> work with corss-cpu computations.  I could post the patch if it would
> be of interest...

Yes please, Paul said he would many times.