linux-kernel - Re: [discussion]sched: a rough proposal to enable power saving in scheduler

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Message-ID: <502CC454.6070405@intel.com>
Date:	Thu, 16 Aug 2012 17:58:44 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	preeti <preeti@...ux.vnet.ibm.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	vincent.guittot@...aro.org, svaidy@...ux.vnet.ibm.com,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>
Subject: Re: [discussion]sched: a rough proposal to enable power saving in
 scheduler

On 08/16/2012 02:53 PM, preeti wrote:

> 
> Hi everyone,
> 
> From what I have understood so far,I try to summarise pin pointed
> differences between the performance and power policies as found
> relevant to the scheduler-load balancing mechanism.Any thoughts?


Currently, the load_balance trigger will be called in timer for periodic
tick, or dynamic tick.
In periodic tick, the cpu is waked, so do load_balance is not cost much.
But in dynamic tick. we'd better do power policy suitable scenario
checking in nohz_kick_needed(), and then do nohz_balancer_kick on least
but non-idle cpu if possible. that reduce the idle cpu waking chance.

Any comments?

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