linux-kernel - Re: SCHED_IDLE documentation

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Date:	Mon, 3 Mar 2008 10:31:51 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Michael Kerrisk <mtk.manpages@...glemail.com>,
	Christoph Hellwig <hch@....de>, cbe-oss-dev@...abs.org,
	Jeremy Kerr <jk@...abs.org>, linux-kernel@...r.kernel.org
Subject: Re: SCHED_IDLE documentation

On Monday 03 March 2008, Ingo Molnar wrote:
> > * What's the difference between SCHED_IDLE and SCHED_BATCH?
> 
> SCHED_BATCH can still have nice levels from -20 to +19, it is a modified 
> SCHED_OTHER/SCHED_NORMAL for "throughput oriented" workloads.
> 
> SCHED_IDLE overrides the nice settings and it means a "super idle" 
> workload.

Does that mean that a SCHED_IDLE task still runs some of the time if
you have a CPU hog running on +19, or can any other process starve the
SCHED_IDLE task?

What happens if you have two SCHED_IDLE tasks on a single CPU, do they get
equal share, or will they just run as batch jobs?

	Arnd <><
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