linux-kernel - Re: [PATCH 3/4] sched: introduce synchronized idle injection

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Message-ID: <20151119200906.GS3816@twins.programming.kicks-ass.net>
Date:	Thu, 19 Nov 2015 21:09:06 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Morten Rasmussen <morten.rasmussen@....com>
Cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <john.stultz@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Len Brown <len.brown@...el.com>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH 3/4] sched: introduce synchronized idle injection

On Thu, Nov 19, 2015 at 05:24:07PM +0000, Morten Rasmussen wrote:
> I would consider it an
> emergency-only mechanism (as in emergency brake) that isn't really
> suitable for normal thermal management. In which case: Does this sort of
> mechanism belong in the scheduler code?

I would prefer it not to be, but Thomas is very much opposed to teaching
the nohz code to 'work' on !idle threads.


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