linux-kernel - Re: [PATCH v3 05/22] sched: remove domain iterations in fork/exec/wake

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Message-ID: <50F4C027.1080806@intel.com>
Date:	Tue, 15 Jan 2013 10:34:15 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	li guang <lig.fnst@...fujitsu.com>
CC:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"bp@...en8.de" <bp@...en8.de>, "pjt@...gle.com" <pjt@...gle.com>,
	"namhyung@...nel.org" <namhyung@...nel.org>,
	"efault@....de" <efault@....de>,
	"vincent.guittot@...aro.org" <vincent.guittot@...aro.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 05/22] sched: remove domain iterations in fork/exec/wake

On 01/14/2013 05:03 PM, li guang wrote:
>>> > > This corner case may occur after "[PATCH v3 03/22] sched: fix
>>> > > find_idlest_group mess logical" brought in the local sched_group bias,
>>> > > and assume balancing runs on cpux2.
>>> > > ideally,  find_idlest_group should find the real idlest(this case: sgy),
>>> > > then, this patch is reasonable.
>>> > > 
>> > 
>> > Sure. but seems it is a bit hard to go down the idlest group.
>> > 
>> > and the old logical is real cost too much, on my 2 socket NHM/SNB
>> > server, hackbench can increase 2~5% performance. and no clean
>> > performance on kbuild/aim7 etc.
> what about remove local group bias?


Any theory profit for non local group? Usually, bias toward local group
will has cache locality profit.

-- 
Thanks Alex
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