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

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Date:	Fri, 11 Sep 2009 18:38:10 +0300
From:	Török Edwin <edwintorok@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Steven Rostedt <rostedt@...dmis.org>, 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 18:18, Frederic Weisbecker wrote:
> On Fri, Sep 11, 2009 at 11:11:56AM -0400, Steven Rostedt wrote:
>   
>> On Fri, 2009-09-11 at 16:55 +0200, Frederic Weisbecker wrote:
>>
>>     
>>> Oh, BTW, what would you think about addding the current->lock_depth
>>> in the latency format? That may help debug the bkl...
>>>       
>> Hmm, that would require adding another field for all traces. I don't
>> want to increase the size of an entry unneeded. BTW, this is for all
>> entries (even events).
>>     
>
>
> Right...
>
>  
>   
>> 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?

Best regards,
--Edwin
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