linux-kernel - Re: scheduler nice 19 versus 'idle' behavior / static low-priority scheduling

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Message-Id: <1233380284.5636.5.camel@marge.simson.net>
Date:	Sat, 31 Jan 2009 06:38:04 +0100
From:	Mike Galbraith <efault@....de>
To:	Brian Rogers <brian@...w.org>
Cc:	Nathanael Hoyle <nhoyle@...letech.com>,
	Jan Engelhardt <jengelh@...ozas.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	stable <stable@...nel.org>
Subject: Re: scheduler nice 19 versus 'idle' behavior / static low-priority
	scheduling

On Fri, 2009-01-30 at 14:12 -0800, Brian Rogers wrote:
> Mike Galbraith wrote:
> > On Fri, 2009-01-30 at 02:59 -0500, Nathanael Hoyle wrote:
> >   
> >> I am running foldingathome under it at the moment, and it seems to be
> >> improving the situation somewhat, but I still need/want to test with
> >> Mike's referenced patches.
> >>     
> > You will most definitely encounter evilness running SCHED_IDLE tasks in
> > a kernel without the SCHED_IDLE fixes.
> >   
> Speaking of SCHED_IDLE fixes, is 
> 6bc912b71b6f33b041cfde93ca3f019cbaa852bc going to be put into the next 
> stable 2.6.28 release? Without it on 2.6.28.2, I can still produce 
> minutes-long freezes with BOINC or other idle processes.
> 
> With the above commit on top of 2.6.28.2 and also 
> cce7ade803699463ecc62a065ca522004f7ccb3d, the problem is solved, though 
> I assume cce7ad isn't actually required to fix that, and I can test that 
> if desired.

I think they both should go to stable, but dunno if they're headed that
direction or not.

One way to find out, CCs added.

	-Mike

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