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

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Message-ID: <51AC2EA2.7030106@linux.vnet.ibm.com>
Date:	Mon, 03 Jun 2013 13:50:26 +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 01:22 PM, Mike Galbraith wrote:
[snip]
>>
>> I agree that this idea, in other work, 'stop wake-affine when current is
>> busy with wakeup' may miss the chance to bring benefit, although I could
>> not find such workload, but I can't do promise...
> 
> Someday we'll find the perfect balance... likely the day before the sun
> turns into a red giant and melts the earth.

Won't take so long ;-)

I would like to stop the regression on pgbench firstly, as PeterZ
mentioned, if someone reported other regressions, we will know what is
missing, if fix is possible, we fix it, if cost is too high, then I say
we ignore the illegal income, after all, we could not benefit one in the
cost of sacrifice others...

I'd like to fix the problem ASAP, it's really a big, urgent problem on
my point of view, but doesn't win enough attentions as I thought it will...

The regression has been buried too long and hidden, if we miss the
chance to correct the issue this time, it will no doubt been buried again...

Regards,
Michael Wang

> 
> -Mike
> 
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