linux-kernel - Re: [PATCH 2/2] ring-buffer: no preempt for sched

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Message-ID: <20081112102403.GB24482@elte.hu>
Date:	Wed, 12 Nov 2008 11:24:03 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 2/2] ring-buffer: no preempt for sched_clock


* Steven Rostedt <rostedt@...dmis.org> wrote:

> Impact: disable preemption no calling sched_clock
> 
> The ring_buffer_time_stamp still uses sched_clock as its counter.
> But it is a bug to call it with preemption enabled. This requirement
> should not be pushed to the ring_buffer_time_stamp callers, so
> the ring_buffer_time_stamp needs to disable preemption when calling
> sched_clock.
> 
> Signed-off-by: Steven Rostedt <srostedt@...hat.com>
> ---
>  kernel/trace/ring_buffer.c |    8 +++++++-
>  1 files changed, 7 insertions(+), 1 deletions(-)

applied to tip/tracing/urgent, thanks Steve!

	Ingo
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