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From: Arnd Bergmann <arnd@arndb.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: Michael Kerrisk <mtk.manpages@googlemail.com>,
	Christoph Hellwig <hch@lst.de>,
	cbe-oss-dev@ozlabs.org, Jeremy Kerr <jk@ozlabs.org>,
	linux-kernel@vger.kernel.org
Subject: Re: SCHED_IDLE documentation
Date: Mon, 3 Mar 2008 10:31:51 +0100	[thread overview]
Message-ID: <200803031031.52335.arnd@arndb.de> (raw)
In-Reply-To: <20080303092422.GA18281@elte.hu>

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 <><

  reply	other threads:[~2008-03-03  9:32 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1203376368.275756.252634247263.1.gpush@pokey>
     [not found] ` <200803030612.28039.arnd@arndb.de>
     [not found]   ` <20080303051719.GA26102@lst.de>
2008-03-03  6:21     ` Arnd Bergmann
2008-03-03  7:33       ` Ingo Molnar
2008-03-03  8:40         ` Michael Kerrisk
2008-03-03  9:24           ` Ingo Molnar
2008-03-03  9:31             ` Arnd Bergmann [this message]
2008-03-03 10:03               ` Michael Kerrisk
2008-03-03 10:04               ` Ingo Molnar
2008-03-03 10:12                 ` Michael Kerrisk
2008-03-03 10:07             ` Michael Kerrisk
2008-03-03 10:17               ` Ingo Molnar
2008-03-03 10:20                 ` Michael Kerrisk
2008-03-03 12:31             ` Michael Kerrisk
2008-03-03 12:52               ` Ingo Molnar
2008-03-03 14:06                 ` Michael Kerrisk
2008-03-04 11:11                   ` Peter Zijlstra
2008-03-05 15:19                     ` Michael Kerrisk
2008-03-03 14:42                 ` Michael Kerrisk
2008-03-05 15:02                   ` Michael Kerrisk

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