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Subject: Re: [patch] voluntary-preempt-2.6.8-rc3-O5
From: Lee Revell <rlrevell@joe-job.com>
To: Florian Schmidt <mista.tapas@gmx.net>
Cc: Ingo Molnar <mingo@elte.hu>, linux-kernel <linux-kernel@vger.kernel.org>,
       Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>,
       jackit-devel <jackit-devel@lists.sourceforge.net>,
       Paul Davis <paul@linuxaudiosystems.com>
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On Thu, 2004-08-12 at 21:18, Florian Schmidt wrote:
> On Thu, 12 Aug 2004 20:55:30 -0400
> Lee Revell <rlrevell@joe-job.com> wrote:
> 
> > Even if it is not a long non-preemptible section, mlockall-test is
> > still doing *something* that causes an xrun in jackd.  Maybe
> > interrupts are being disabled for a long time.  Whatever it is, it
> > cannot possibly be a jackd bug, because mlockall by an unrelated,
> > normal-priority process causes an xrun in the SCHED_FIFO jackd
> > process.
> 
> Hmm, yes, that makes sense. I wonder: does mlockall have any influence
> on IPC?
> 

Good question.  I did repeat your test (disabling xrun_debug) and I can
confirm that I no longer get a preempt timing violation, but
mlockall-test still triggers xruns in jackd every time.  So there is
something else going on here.

Lee