linux-kernel - Re: [PATCH 3/3] tracing: add latency format to function

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Date:	Fri, 11 Sep 2009 19:08:00 +0300
From:	Török Edwin <edwintorok@...il.com>
To:	rostedt@...dmis.org
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>
Subject: Re: [PATCH 3/3] tracing: add latency format to function_graph tracer

On 2009-09-11 18:50, Steven Rostedt wrote:
> On Fri, 2009-09-11 at 18:38 +0300, Török Edwin wrote:
>   
>> On 2009-09-11 18:18, Frederic Weisbecker wrote:
>>     
>>> On Fri, Sep 11, 2009 at 11:11:56AM -0400, Steven Rostedt wrote:
>>>       
>>   
>>     
>>>> Ug! I just noticed that tgid was added to struct trace_entry, with the
>>>> only user as the user stack entry. This should be in the user stack
>>>> field not something that goes into every event!
>>>>
>>>> I guess I need to fix that too.
>>>>     
>>>>         
>> Indeed tgid should be part of struct userstack_entry, and set in
>> ftrace_trace_userstack.
>> Do you want to me to write up a patch for that, or have you already
>> fixed it?
>>     
>
> I've just fixed it, thanks!

Ok.

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?).

Best regards,
--Edwin
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