linux-kernel - Re: [RFC PATCH 0/3] CFS idle injection

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Message-ID: <563CF1A9.8030700@arm.com>
Date:	Fri, 6 Nov 2015 18:30:01 +0000
From:	Dietmar Eggemann <dietmar.eggemann@....com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:	Eduardo Valentin <edubezval@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Paul Turner <pjt@...gle.com>, Len Brown <len.brown@...el.com>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Andi Kleen <andi.kleen@...el.com>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>
Subject: Re: [RFC PATCH 0/3] CFS idle injection

On 05/11/15 10:12, Peter Zijlstra wrote:
> 
> People, trim your emails!
> 
> On Wed, Nov 04, 2015 at 08:58:30AM -0800, Jacob Pan wrote:
> 
>>> I also like #2 too. Specially now that it is not limited to a specific
>>> platform. One question though, could you still keep the cooling device
>>> support of it? In some systems, it might make sense to enable /
>>> disable idle injections based on temperature.
> 
>> One of the key difference between 1 and 2 is that #2 is open loop
>> control, since we don't have CPU c-states info baked into scheduler. 
> 
> _yet_, there's people working on that. The whole power aware scheduling
> stuff needs that.

Isn't the idle state information (rq->idle_state) already used in
find_idlest_cpu()?

What we use in energy aware scheduling is quite similar but since we're
interested in the index information of the c-state (to access the right
element of the idle_state vectors of the energy model, we added
rq->idle_state_idx.

[...]

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