linux-kernel - Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency mask model

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Date:	Mon, 10 Aug 2015 10:33:30 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
cc:	Juri Lelli <juri.lelli@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency
 mask model

On Mon, 10 Aug 2015, Frederic Weisbecker wrote:

> I considered many times relying on hrtick btw but everyone seem to say it has a lot
> of overhead, especially due to clock reprogramming on schedule() calls.

Depends on how many ticks you can save I would think. It certainly is
worthwhile if you can avoid 10 ticks? Can we figure out how far in the
future that event is? If its more than 10 ticks away then its worth to
switch off the tick?


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