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

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Date:	Wed, 10 Apr 2013 10:51:13 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Mike Galbraith <efault@....de>,
	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: wake-affine throttle

On Wed, 2013-04-10 at 11:30 +0800, Michael Wang wrote:
> | 15 GB   |      32 | 35918 |   | 37632 | +4.77% | 47923 | +33.42% |
> 52241 | +45.45%

So I don't get this... is wake_affine() once every milisecond _that_
expensive?

Seeing we get a 45%!! improvement out of once every 100ms that would
mean we're like spending 1/3rd of our time in wake_affine()? that's
preposterous. So what's happening?



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