From: Ingo Molnar <mingo@elte.hu>
To: kus Kusche Klaus <kus@keba.com>
Cc: linux-kernel@vger.kernel.org, dwalker@mvista.com
Subject: Re: Real-Time Preemption: Magic Sysrq p doesn't work
Date: Mon, 9 May 2005 14:13:24 +0200 [thread overview]
Message-ID: <20050509121324.GA20941@elte.hu> (raw)
In-Reply-To: <AAD6DA242BC63C488511C611BD51F367323203@MAILIT.keba.co.at>
* kus Kusche Klaus <kus@keba.com> wrote:
> While testing, I noticed that Sysrq p is silently ignored on current
> RT kernels with RT preemption: The syslog contains a message that
> Sysrq p was pressed, but no registers are printed.
yes, that's because the keyboard interrupt is 'threaded' - hence there's
no 'interrupted stack' to print a backtrace of. You should be able to
see all (including currently running) task's backtraces in SysRq-T
output.
are you trying to use it to debug a particular bug?
Ingo
next prev parent reply other threads:[~2005-05-09 12:13 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-09 10:58 kus Kusche Klaus
2005-05-09 12:13 ` Ingo Molnar [this message]
2005-05-09 13:07 kus Kusche Klaus
2005-05-09 14:02 ` Ingo Molnar
2005-05-09 15:37 ` Lee Revell
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