From: Robert Love <rml@tech9.net>
To: Duncan Sands <duncan.sands@math.u-psud.fr>
Cc: Kilobug <kilobug@freesurf.fr>, linux-kernel@vger.kernel.org
Subject: Re: [bug report] System hang up with Speedtouch USB hotplug
Date: 20 Nov 2001 09:58:10 -0500 [thread overview]
Message-ID: <1006268291.5448.2.camel@phantasy> (raw)
In-Reply-To: <E166A9X-0000Co-00@baldrick>
In-Reply-To: <E165lQB-0001DZ-00@baldrick> <1006204883.826.0.camel@phantasy> <E166A9X-0000Co-00@baldrick>
On Tue, 2001-11-20 at 07:37, Duncan Sands wrote:
> By the way, I find the preemptible kernel patch
> very helpful for debugging SMP problems on a
> uniprocessor machine.
>
> I'm trying to debug the speedtouch kernel module
> crashes with SMP using it: the module oopses
> nicely with preempt too!
This is a nice unintended benefit of the preemptible kernel patch, eh?
It also helps in your SMP debugging because you can see the lock depth
(how many locks are held) via current->preempt_count. The preempt patch
will also prevent you from infinite looping in the kernel, assuming the
system is able to preempt itself.
Robert Love
next prev parent reply other threads:[~2001-11-20 14:58 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-19 10:12 [bug report] System hang up with Speedtouch USB hotplug Duncan Sands
2001-11-19 21:21 ` Robert Love
2001-11-20 8:03 ` Duncan Sands
2001-11-20 12:37 ` Duncan Sands
2001-11-20 14:58 ` Robert Love [this message]
2001-11-20 10:55 ` Kilobug
-- strict thread matches above, loose matches on Subject: below --
2001-11-17 1:55 Kilobug
2001-11-17 7:13 ` Greg KH
2001-11-17 12:58 ` Kilobug
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