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

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Date:	Mon, 03 Jun 2013 11:26:12 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Mike Galbraith <efault@....de>
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: [RFC PATCH] sched: smart wake-affine

On 06/03/2013 11:09 AM, Mike Galbraith wrote:
> On Mon, 2013-06-03 at 10:28 +0800, Michael Wang wrote: 
>> On 05/28/2013 01:05 PM, Michael Wang wrote:
>>> 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.
>>>
>>> However, the whole stuff is somewhat blindly and time-consuming, some
>>> workload therefore suffer.
>>>
>>> And testing show it could damage pgbench 50% at most.
>>>
>>> Thus, wake-affine stuff should be smarter, and realise when to stop
>>> it's thankless effort.
>>
>> Is there any comments?
> 
> (I haven't had time to test-drive yet, -rt munches time like popcorn)

I see ;-)

During my testing, this one works well on the box, solved the issues of
pgbench and won't harm hackbench any, I think we have caught some good
point here :)

Regards,
Michael Wang

> 
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