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From: Ingo Molnar <mingo@elte.hu>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Jan Kiszka <jan.kiszka@siemens.com>,
linux-kernel@vger.kernel.org,
Frederic Weisbecker <fweisbec@gmail.com>,
Abhishek Sagar <sagar.abhishek@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Steven Rostedt <srostedt@redhat.com>
Subject: Re: [PATCH 08/13 v2] ftrace: do not trace init sections
Date: Thu, 23 Oct 2008 18:40:32 +0200 [thread overview]
Message-ID: <20081023164032.GA19070@elte.hu> (raw)
In-Reply-To: <alpine.DEB.1.10.0810231202310.1765@gandalf.stny.rr.com>
* Steven Rostedt <rostedt@goodmis.org> wrote:
> > I don't know if this feature is already considered for / part of
> > mainline, but oops backtraces based on mcount instrumentation used
> > to be quite helpful for me to understand the wider context of
> > several faults. The more you have to mask out of this picture, the
> > harder it gets to match the trace to your model of the kernel
> > activities. At least you have to know more in advance about the
> > limitation of the tracer...
>
> The ftrace buffer can be dumped out on oops. I'm not sure if it is
> always on. If it is, I need to make it default off and add a command
> line and sysctl to turn it on. Otherwise, we will have people
> complaining about the extra output to the console on oops.
it dumps currently if a tracer is enabled. I saw it a couple of times
already during crashes.
Ingo
next prev parent reply other threads:[~2008-10-23 16:41 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-22 21:27 [PATCH 00/13 v2] ftrace: clean ups and fixes Steven Rostedt
2008-10-22 21:27 ` [PATCH 01/13 v2] ftrace: handle generic arch calls Steven Rostedt
2008-10-27 15:35 ` Ingo Molnar
2008-10-22 21:27 ` [PATCH 02/13 v2] ftrace: dynamic ftrace process only text section Steven Rostedt
2008-10-22 21:27 ` [PATCH 03/13 v2] ftrace: return error on failed modified text Steven Rostedt
2008-10-22 21:27 ` [PATCH 04/13 v2] ftrace: comment arch ftrace code Steven Rostedt
2008-10-22 21:27 ` [PATCH 05/13 v2] ftrace: use probe_kernel Steven Rostedt
2008-10-22 21:27 ` [PATCH 06/13 v2] ftrace: only have ftrace_kill atomic Steven Rostedt
2008-10-22 21:27 ` [PATCH 07/13 v2] ftrace: add ftrace warn on to disable ftrace Steven Rostedt
2008-10-22 21:27 ` [PATCH 08/13 v2] ftrace: do not trace init sections Steven Rostedt
2008-10-23 11:15 ` Jan Kiszka
2008-10-23 11:36 ` Steven Rostedt
2008-10-23 14:30 ` Jan Kiszka
2008-10-23 16:05 ` Steven Rostedt
2008-10-23 16:40 ` Ingo Molnar [this message]
2008-10-23 16:51 ` Steven Rostedt
2008-10-22 21:27 ` [PATCH 09/13 v2] ftrace: disable dynamic ftrace for all archs that use daemon Steven Rostedt
2008-10-22 21:27 ` [PATCH 10/13 v2] ftrace: remove daemon Steven Rostedt
2008-10-22 21:27 ` [PATCH 11/13 v2] ftrace: remove mcount set Steven Rostedt
2008-10-22 21:27 ` [PATCH 12/13 v2] ftrace: remove ftrace hash Steven Rostedt
2008-10-22 21:27 ` [PATCH 13/13 v2] ftrace: remove notrace from arch ftrace file Steven Rostedt
2008-10-23 9:29 ` [PATCH 00/13 v2] ftrace: clean ups and fixes Wenji Huang
2008-10-23 10:49 ` Steven Rostedt
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