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

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Message-ID: <20090911154349.GB6069@nowhere>
Date:	Fri, 11 Sep 2009 17:43:51 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Török Edwin <edwintorok@...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 Fri, Sep 11, 2009 at 06:38:10PM +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:
> >   
> >> 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


No, please do.

Thanks!

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