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

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Message-ID: <Pine.LNX.4.58.0710021536001.12287@gandalf.stny.rr.com>
Date:	Tue, 2 Oct 2007 15:37:28 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mike Kravetz <kravetz@...ibm.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Clark Williams <williams@...hat.com>
Subject: Re: -rt scheduling: wakeup bug?


--
On Tue, 2 Oct 2007, Mike Kravetz wrote:

> 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.

FYI,

I've incorporated Ingo's patch into the lastest -rt release.

 http://www.kernel.org/pub/linux/kernel/projects/rt/patch-2.6.23-rc9-rt1.bz2

-- Steve

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