Re: [patch] voluntary-preempt-2.6.8-rc3-O5
From: Lee Revell
Date: Thu Aug 12 2004 - 20:12:42 EST
On Thu, 2004-08-12 at 21:18, Florian Schmidt wrote:
> On Thu, 12 Aug 2004 20:55:30 -0400
> Lee Revell <rlrevell@xxxxxxxxxxx> 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.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/