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

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Message-ID: <49837B32.3010206@xyzw.org>
Date:	Fri, 30 Jan 2009 14:12:02 -0800
From:	Brian Rogers <brian@...w.org>
To:	Mike Galbraith <efault@....de>
CC:	Nathanael Hoyle <nhoyle@...letech.com>,
	Jan Engelhardt <jengelh@...ozas.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: scheduler nice 19 versus 'idle' behavior / static low-priority
 scheduling

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.

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