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

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Message-Id: <1252681916.18996.697.camel@gandalf.stny.rr.com>
Date:	Fri, 11 Sep 2009 11:11:56 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
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, 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).

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.

-- Steve

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