linux-kernel - Re: [RFC] sched: CPU topology try

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Date:	Wed, 08 Jan 2014 16:37:49 +0800
From:	Alex Shi <alex.shi@...aro.org>
To:	Morten Rasmussen <morten.rasmussen@....com>,
	Vincent Guittot <vincent.guittot@...aro.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Dietmar Eggemann <Dietmar.Eggemann@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"pjt@...gle.com" <pjt@...gle.com>,
	"cmetcalf@...era.com" <cmetcalf@...era.com>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	"preeti@...ux.vnet.ibm.com" <preeti@...ux.vnet.ibm.com>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	"corbet@....net" <corbet@....net>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"len.brown@...el.com" <len.brown@...el.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"amit.kucheria@...aro.org" <amit.kucheria@...aro.org>,
	"james.hogan@...tec.com" <james.hogan@...tec.com>,
	"schwidefsky@...ibm.com" <schwidefsky@...ibm.com>,
	"heiko.carstens@...ibm.com" <heiko.carstens@...ibm.com>
Subject: Re: [RFC] sched: CPU topology try

On 01/07/2014 11:37 PM, Morten Rasmussen wrote:
>>> > >
>>> > > So something like:
>>> > >
>>> > >   avg = runnable + p(i) * blocked; where p(i) \e [0,1]
>>> > >
>>> > > could maybe be used to replace the cpu_load array and still represent
>>> > > the concept of looking at a bigger picture for larger sets. Leaving open
>>> > > the details of the map p.
> Figuring out p is the difficult bit. AFAIK, with blocked load in its
> current form we don't have any clue when a task will reappear.

Yes, that's why we can not find a suitable way to consider the blocked
load in load balance.


-- 
Thanks
    Alex
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