From: Ingo Molnar <mingo@elte.hu>
To: Florian Schmidt <mista.tapas@gmx.net>
Cc: Rui Nuno Capela <rncbc@rncbc.org>,
linux-kernel@vger.kernel.org, Lee Revell <rlrevell@joe-job.com>,
mark_h_johnson@raytheon.com, "K.R. Foley" <kr@cybsft.com>,
Bill Huey <bhuey@lnxw.com>, Adam Heath <doogie@debian.org>,
Thomas Gleixner <tglx@linutronix.de>,
Michal Schmidt <xschmi00@stud.feec.vutbr.cz>,
Fernando Pablo Lopez-Lezcano <nando@ccrma.stanford.edu>,
Karsten Wiese <annabellesgarden@yahoo.de>,
Gunther Persoons <gunther_persoons@spymac.com>,
emann@mrv.com, Shane Shrybman <shrybman@aei.ca>,
Amit Shah <amit.shah@codito.com>,
Esben Nielsen <simlo@phys.au.dk>, Andrew Morton <akpm@osdl.org>
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.31-19
Date: Thu, 2 Dec 2004 14:10:02 +0100 [thread overview]
Message-ID: <20041202131002.GA30503@elte.hu> (raw)
In-Reply-To: <20041202140612.4c07bca8@mango.fruits.de>
* Florian Schmidt <mista.tapas@gmx.net> wrote:
> Hmm, i wonder if there's a way to detect non RT behaviour in jackd
> clients. I mean AFAIK the only thing allowed for the process callback
> of on is the FIFO it waits on to be woken, right? Every other sleeping
> is to be considered a bug.
there's such a feature in -RT kernels. If a user process calls:
gettimeofday(1,1);
then the kernel turns 'atomic mode' on. To turn it off, call:
gettimeofday(1,0);
while in atomic-mode, any non-atomic activity (scheduling) will produce
a kernel message and a SIGUSR2 sent to the offending process (once,
atomic mode has to be re-enabled again for the next message). Preemption
by a higher-prio task does not trigger a message/signal.
If you run the client under gdb you should be able to catch the SIGUSR2
signal and then you can see the offending code's backtrace via 'bt'.
Ingo
next prev parent reply other threads:[~2004-12-02 13:10 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-26 12:12 Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.31-7 Rui Nuno Capela
2004-11-29 11:05 ` Ingo Molnar
2004-11-29 11:16 ` Ingo Molnar
2004-11-29 11:24 ` Ingo Molnar
2004-11-29 15:42 ` Ingo Molnar
2004-11-29 13:13 ` Rui Nuno Capela
2004-11-29 14:33 ` Ingo Molnar
2004-11-29 15:23 ` Ingo Molnar
2004-11-29 23:16 ` Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.31-13 Gene Heskett
2004-11-30 1:50 ` K.R. Foley
2004-11-30 3:19 ` Gene Heskett
2004-11-30 4:54 ` Gene Heskett
2004-11-30 15:26 ` K.R. Foley
2004-11-30 16:24 ` Gene Heskett
2004-11-30 16:52 ` Zwane Mwaikambo
2004-12-01 7:16 ` Gene Heskett
2004-11-30 16:57 ` K.R. Foley
2004-11-30 10:29 ` Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.31-7 Rui Nuno Capela
2004-11-30 13:19 ` Ingo Molnar
2004-11-30 15:39 ` Rui Nuno Capela
2004-11-30 16:42 ` Ingo Molnar
2004-12-01 10:32 ` Ingo Molnar
2004-12-01 11:25 ` Ingo Molnar
2004-12-01 12:49 ` Rui Nuno Capela
2004-12-01 12:47 ` Rui Nuno Capela
2004-12-01 15:40 ` Ingo Molnar
2004-12-01 16:06 ` Ingo Molnar
2004-12-01 16:20 ` [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.31-19 Ingo Molnar
2004-12-01 16:31 ` Ingo Molnar
2004-12-01 18:59 ` Rui Nuno Capela
2004-12-01 21:29 ` Ingo Molnar
2004-12-01 21:30 ` Ingo Molnar
[not found] ` <32788.192.168.1.8.1101938057.squirrel@192.168.1.8>
2004-12-01 21:58 ` Ingo Molnar
2004-12-01 22:04 ` Rui Nuno Capela
2004-12-01 22:09 ` Ingo Molnar
2004-12-01 22:31 ` Rui Nuno Capela
2004-12-02 9:12 ` Rui Nuno Capela
2004-12-02 12:59 ` Rui Nuno Capela
2004-12-02 16:38 ` Fernando Lopez-Lezcano
2004-12-01 22:43 ` Florian Schmidt
2004-12-02 8:40 ` Ingo Molnar
2004-12-02 12:22 ` Florian Schmidt
2004-12-02 12:29 ` Ingo Molnar
2004-12-02 13:06 ` Florian Schmidt
2004-12-02 13:10 ` Ingo Molnar [this message]
2004-12-02 13:40 ` Florian Schmidt
2004-12-02 13:49 ` Ingo Molnar
2004-12-02 16:08 ` Florian Schmidt
2004-12-02 17:44 ` Florian Schmidt
2004-12-02 21:12 ` Florian Schmidt
2004-12-02 13:18 ` Rui Nuno Capela
2004-12-03 1:41 ` Fernando Lopez-Lezcano
2004-12-03 2:23 ` Fernando Lopez-Lezcano
2004-11-30 18:13 ` Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.31-7 Remi Colinet
2004-11-30 8:15 ` Ingo Molnar
2004-12-01 8:30 ` Eran Mann
2004-12-01 8:53 ` Ingo Molnar
2004-12-01 18:19 ` Adam Heath
-- strict thread matches above, loose matches on Subject: below --
2004-12-02 21:01 [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.31-19 Mark_H_Johnson
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