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

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Date:	Fri, 11 Sep 2009 17:18:13 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	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>,
	edwintorok@...il.com
Subject: Re: [PATCH 3/3] tracing: add latency format to function_graph
	tracer

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.
> 
> Well, maybe replacing tgid with lock_depth may not be a bad idea after
> all.


Yeah, would be nice. This would be an interesting  general purpose
field.

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