linux-kernel - Re: [BUG] How to get real-time priority using idle priority

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Date:	Thu, 15 Jan 2009 04:07:15 -0800
From:	Brian Rogers <brian@...w.org>
To:	Mike Galbraith <efault@....de>
CC:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [BUG] How to get real-time priority using idle priority

Mike Galbraith wrote:
> On Mon, 2009-01-12 at 17:05 -0800, Brian Rogers wrote:
>   
>> Ingo Molnar wrote:
>>     
>>> i've applied your fix to tip/sched/urgent and merged it into tip/master.
>>> Brian, you might want to test tip/master, as per:
>>>
>>>  http://people.redhat.com/mingo/tip.git/README
>>>
>>> which now has this fix included. Can you make it break?
>>>       
>> Yeah, I was able to trigger the same freeze again once on my desktop, 
>> but it appears to be harder to trigger now. I couldn't get my program to 
>> freeze the system, but one of the times I suspended then resumed BOINC, 
>> it happened.
>>     
> OK, the below seems to cure all of the problems I've encountered, please
> take it out for a spin.
>   
This did the trick! I can't make it freeze anymore, with BOINC or with 
forkdie, and the system remains responsive even with dozens of idle 
priority tasks hogging all spare CPU time. It's great!

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