linux-kernel - Re: -rt scheduling: wakeup bug?

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Message-ID: <20071002193050.GB3162@monkey.ibm.com>
Date:	Tue, 2 Oct 2007 12:30:50 -0700
From:	Mike Kravetz <kravetz@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Clark Williams <williams@...hat.com>
Subject: Re: -rt scheduling: wakeup bug?

On Tue, Oct 02, 2007 at 07:06:32AM +0200, Ingo Molnar wrote:
> * Mike Kravetz <kravetz@...ibm.com> wrote:
> > 
> > My observations/debugging/conclusions are based on an earlier version 
> > of the code.  It appears the same code/issue still exists in the most 
> > version.  But, I have not not done any work with the latest version.
> 
> I believe you are right - nice catch of this very nontrivial bug! The 
> patch below is against .23-rc - do you think this fix (of moving the rt 
> wakeup sequence to after the activate_task()) is adequate?

Yes, I have been running with a similar patch on a (much) earlier
version of the code.  It has helped quite a bit.  I would have
put together a patch for a later version, but my test environment
is limited to this earlier version.

-- 
Mike
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