From: Matt Fleming <matt@console-pimps.org>
To: "Török Edwin" <edwintorok@gmail.com>
Cc: rostedt@goodmis.org, Frederic Weisbecker <fweisbec@gmail.com>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Li Zefan <lizf@cn.fujitsu.com>,
Mathieu Desnoyers <compudj@krystal.dyndns.org>,
Paul Mundt <lethal@linux-sh.org>
Subject: Re: [PATCH 3/3] tracing: add latency format to function_graph tracer
Date: Sat, 12 Sep 2009 11:25:07 +0100 [thread overview]
Message-ID: <20090912102506.GC21695@console-pimps.org> (raw)
In-Reply-To: <4AAA75E0.6020604@gmail.com>
On Fri, Sep 11, 2009 at 07:08:00PM +0300, Török Edwin wrote:
>
> BTW any plans on integrating an in-kernel unwinder like systemtap has?
>
> Even if I build libc with framepointers, a userspace stacktrace on
> x86-64 can't go beyond most pthreads routines, like __read_nocancel
> (they're written in asm maybe?).
>
fyi SH has an in-kernel DWARF unwinder. It was my intention to shake out
most of the bugs (of which there have been a few) by having it in the SH
tree and then submit it for generic inclusion.
So by carefully placing .cfi_* directives in assembly, you can get
stacktraces for assembly routines in the kernel.
The branch containing the latest code is here,
http://git.kernel.org/?p=linux/kernel/git/lethal/sh-2.6.git;a=shortlog;h=sh/dwarf-unwinder
prev parent reply other threads:[~2009-09-12 10:25 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-11 13:54 [PATCH 0/3] [GIT PULL] tracing: various updates Steven Rostedt
2009-09-11 13:54 ` [PATCH 1/3] x86/tracing: comment need for atomic nop Steven Rostedt
2009-09-11 13:54 ` [PATCH 2/3] tracing/profile: add ref count for registering profile events Steven Rostedt
2009-09-11 14:04 ` Peter Zijlstra
2009-09-11 14:09 ` Peter Zijlstra
2009-09-11 14:33 ` Steven Rostedt
2009-09-11 14:37 ` Peter Zijlstra
2009-09-11 14:52 ` Steven Rostedt
2009-09-12 14:14 ` Mathieu Desnoyers
2009-09-11 14:40 ` Steven Rostedt
2009-09-11 14:12 ` Steven Rostedt
2009-09-11 13:54 ` [PATCH 3/3] tracing: add latency format to function_graph tracer Steven Rostedt
2009-09-11 14:55 ` Frederic Weisbecker
2009-09-11 15:11 ` Steven Rostedt
2009-09-11 15:18 ` Frederic Weisbecker
2009-09-11 15:38 ` Török Edwin
2009-09-11 15:43 ` Frederic Weisbecker
2009-09-11 15:50 ` Steven Rostedt
2009-09-11 16:08 ` Török Edwin
2009-09-12 10:25 ` Matt Fleming [this message]
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