linux-kernel - Re: [PATCH -tip ] [BUGFIX]tracing/kprobes: Fix kprobe-tracer to support stack trace

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Date:	Mon, 06 Jun 2011 20:53:39 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Mike Frysinger <vapier@...too.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	yrl.pp-manager.tt@...achi.com, Russell King <rmk@....linux.org.uk>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH -tip ] [BUGFIX]tracing/kprobes: Fix kprobe-tracer to support
 stack trace

(2011/05/26 21:31), Steven Rostedt wrote:
> On Thu, 2011-05-26 at 01:25 -0400, Mike Frysinger wrote:
> 
>>>  save_stack_trace_regs() function.
>>
>> i think only x86 implements that func ? 
> 
> Looks to be the case. I didn't think so because not all archs failed.
> Hmm, archs like sparc compiled. Perhaps my config prevented tracing
> enabled? I'll need to take a deeper look.

Hm, at a grans, save_stack_trace_tsk() has also limited
implementations, however, there is an weak symbol defined
in kernel/stacktrace.c.
I think we can add save_stack_trace_regs() same way.

BTW, parameters of save_stack_trace_tsk/regs are
a bit different. It would also be fixed.

Thanks,
-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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