linux-kernel - Re: [RFC 3/4] Disable scheduler tick when we are running SCHED

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Message-ID: <1283949943.23762.16.camel@laptop>
Date:	Wed, 08 Sep 2010 14:45:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jan Blunck <jblunck@...e.de>
Cc:	Linux-Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	linux-rt-users@...r.kernel.org,
	Sven-Thorsten Dietrich <sdietrich@...ell.com>,
	Michael Galbraith <MGalbraith@...ell.com>
Subject: Re: [RFC 3/4] Disable scheduler tick when we are running
 SCHED_FIFO tasks

On Wed, 2010-09-08 at 14:29 +0200, Jan Blunck wrote:
> This patch is disabling the scheduler tick to go off when there is a task
> with SCHED_FIFO policy running. Since these tasks are not timesliced anyway
> we only care about timers, softirqs and such stuff just like when we disable
> the tick during idle periods.
> 

Also, doesn't this break any and all jiffies users?

And you need to restart the tick on call_rcu() and everything else that
requires the tick for processing.

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