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

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Message-ID: <20100908144708.GK7436@bolzano.suse.de>
Date:	Wed, 8 Sep 2010 16:47:08 +0200
From:	Jan Blunck <jblunck@...ell.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Linux-Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	linux-rt-users@...r.kernel.org, peterz@...radead.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, Sep 08, Andi Kleen wrote:

> Jan Blunck <jblunck@...e.de> writes:
> 
> > 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.
> 
> How would these tasks accounted for then? 
> 
> The CPU time accounting relies on the timer tick currently.
> 

Yes, that is a known issue.

Jan

> -Andi
> 
> -- 
> ak@...ux.intel.com -- Speaking for myself only.
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