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

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Message-ID: <20151105101218.GB3604@twins.programming.kicks-ass.net>
Date:	Thu, 5 Nov 2015 11:12:18 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	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


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.
 
> To close the loop, perhaps we can export some internal APIs to the
> thermal subsystem then the thermal governors can pick the condition to
> inject idle.

I would much rather that all be part of the power aware stuff, such that
the scheduler itself is aware of thermal limits and can migrate load
away if needed.
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