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Date: Sat, 30 Oct 2004 13:33:11 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Lee Revell <rlrevell@joe-job.com>
Cc: Florian Schmidt <mista.tapas@gmx.net>,
       Paul Davis <paul@linuxaudiosystems.com>,
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       Karsten Wiese <annabellesgarden@yahoo.de>,
       jackit-devel <jackit-devel@lists.sourceforge.net>,
       Rui Nuno Capela <rncbc@rncbc.org>
Subject: Re: [Fwd: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.4]
Message-ID: <20041030113311.GA26881@elte.hu>
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* Ingo Molnar <mingo@elte.hu> wrote:

> > jackd:1507 userspace BUG: scheduling in user-atomic context!
> >  [<c01069fc>] dump_stack+0x1c/0x20 (20)
> >  [<c02834d0>] schedule+0x70/0x100 (24)
> >  [<c010639b>] work_resched+0x6/0x17 (-8124)

> > jackd:1507 userspace BUG: scheduling in user-atomic context!
> >  [<c01069fc>] dump_stack+0x1c/0x20 (20)
> >  [<c02834d0>] schedule+0x70/0x100 (24)
> >  [<c028465d>] down_write_mutex+0xbd/0x180 (36)
> >  [<c012cbf6>] __mutex_lock+0x36/0x40 (16)
> >  [<c012cc75>] _mutex_lock_irqsave+0x15/0x20 (16)
> >  [<c01f1237>] tty_ldisc_try+0x17/0x50 (20)
> >  [<c01f1287>] tty_ldisc_ref_wait+0x17/0xc0 (88)

> this too i'd consider a false positive, because this particular
> printout happened due to a mutex, and a mutex blockage we can consider
> involuntary blockage. [...]

i've uploaded -V0.5.15 with these two false positives fixed, could you
retry your Jackd workload and see whether any other type of scheduling
gets detected? Please also chrt the watchdog thread to a lower priority
than the main thread's priority.

	Ingo
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