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

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Message-ID: <20151120102014.GC17308@twins.programming.kicks-ass.net>
Date:	Fri, 20 Nov 2015 11:20:14 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Morten Rasmussen <morten.rasmussen@....com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	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 Fri, Nov 20, 2015 at 10:45:14AM +0100, Thomas Gleixner wrote:

> The whole concept of faking idle is simply crap.

:-)

> If you want to avoid that stuff in the scheduler, then create a
> mechanism which just defers the next timer interrupt for X
> milliseconds and does not any fiddling with NOHZ state and such.

Not sure that will actually result in the machine going idle. Device
interrupts will still wake tasks and get them ran.

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