linux-kernel - Re: [PATCH] tracing: Drop the tr check from the graph tracing path

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Message-ID: <1263481609.28171.3845.camel@gandalf.stny.rr.com>
Date:	Thu, 14 Jan 2010 10:06:49 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] tracing: Drop the tr check from the graph tracing path

On Thu, 2010-01-14 at 08:23 +0100, Frederic Weisbecker wrote:
> Each time we save a function entry from the function graph tracer,
> we check if the trace array is set, which is wasteful because it is
> set anyway before we start the tracer. All we need is to ensure we
> have good read and write orderings. When we set the trace array, we
> just need to guarantee it to be visible before starting tracing.
> 
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve

> Cc: Lai Jiangshan <laijs@...fujitsu.com>
> Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> ---
>  kernel/trace/trace_functions_graph.c |   19 ++++++++++---------
>  1 files changed, 10 insertions(+), 9 deletions(-)


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