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Date:	Mon, 12 Aug 2013 03:47:48 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Karim Yaghmour <karim.yaghmour@...rsys.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>, mingo@...e.hu
Subject: Re: Reading perf counters at ftrace trace boundaries

> Indeed. It doesn't actually have to be at every single ftrace
> begin/exit. But possibly starting with some kind of every nth and then
> drilling down as the culprit is incrementally singled-out.

That's what normal sampling already does.

If you're worried about systematic shadow effects just randomize a bit.

-Andi
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