linux-kernel - Re: [PATCH 06/18] sched: Generate trace points only if scheduler tracing is enabled

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Date:	Tue, 23 Mar 2010 02:07:58 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 06/18] sched: Generate trace points only if scheduler
	tracing is enabled

On Tue, Mar 23, 2010 at 01:32:08AM +0100, Jan Kara wrote:
> CC: Ingo Molnar <mingo@...e.hu>
> CC: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Jan Kara <jack@...e.cz>
> ---


Note this one is an exception.
Once tracing is enabled, we need the context switch
tracer anyway to keep track of the pid:cmdline mappings.



>  include/trace/events/sched.h |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
> index cfceb0b..0a08ab1 100644
> --- a/include/trace/events/sched.h
> +++ b/include/trace/events/sched.h
> @@ -1,5 +1,7 @@
>  #undef TRACE_SYSTEM
> +#undef TRACE_CONFIG
>  #define TRACE_SYSTEM sched
> +#define TRACE_CONFIG CONFIG_CONTEXT_SWITCH_TRACER
>  
>  #if !defined(_TRACE_SCHED_H) || defined(TRACE_HEADER_MULTI_READ)
>  #define _TRACE_SCHED_H
> -- 
> 1.6.4.2
> 
> --
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