linux-kernel - Re: [PATCH] tracing: mark get_parent

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Message-Id: <1239633813.21121.27.camel@localhost.localdomain>
Date:	Mon, 13 Apr 2009 10:43:33 -0400
From:	Steven Rostedt <srostedt@...hat.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing: mark get_parent_ip() notrace


On Mon, 2009-04-13 at 14:17 +0800, Lai Jiangshan wrote:
> Frederic Weisbecker wrote:
> > On Thu, Apr 02, 2009 at 02:18:25PM +0800, Lai Jiangshan wrote:
> >> Impact: remove redundancy tracing log
> >>
> >> When tracer is "function" or "function_graph", too much
> >> "get_parent_ip" are recorded in ring_buffer.
> > 
> > 
> > Thanks, indeed this get_parent_ip was a bit harrassing
> > in the traces, though I still don't understand why it is
> > called so often.
> > 
> > Anyway, tracing it seems to me not useful.
> > 
> > Acked-by: Frederic Weisbecker <fweisbec@...il.com>
> > 
> > 
> 
> Hi, Ingo,
> 	Could you apply this fix?
> 
> get_parent_ip() is a helper function for ftace, and it is called
> by preempt_disable() and preempt_enable(), so it is occurred very
> often.

I can pull it in too, if Ingo is busy.

-- Steve


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