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

[Steven Rostedt <rostedt@goodmis.org>]

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@gmail.com>

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

-- Steve

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