linux-kernel - Re: [PATCH] sched: smart wake-affine

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Date:	Tue, 02 Jul 2013 07:54:46 +0200
From:	Mike Galbraith <efault@....de>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Alex Shi <alex.shi@...el.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Turner <pjt@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	Ram Pai <linuxram@...ibm.com>
Subject: Re: [PATCH] sched: smart wake-affine

On Tue, 2013-07-02 at 12:43 +0800, Michael Wang wrote: 
> Since RFC:
> 	Tested again with the latest tip 3.10.0-rc7.
> 
> wake-affine stuff is always trying to pull wakee close to waker, by theory,
> this will bring benefit if waker's cpu cached hot data for wakee, or the
> extreme ping-pong case.
> 
> And testing show it could benefit hackbench 15% at most.

How much does this still help with Alex's patches integrated?

aside: were I a maintainer, I'd be a little concerned that what this
helps with collides somewhat with the ongoing numa work.

-Mike

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