linux-kernel - Re: [RFC][PATCH 5/5] perfcounter: Add support for kernel hardware breakpoints

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Message-Id: <1248792162.6987.3013.camel@twins>
Date:	Tue, 28 Jul 2009 16:42:42 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	prasad@...ux.vnet.ibm.com, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Anton Blanchard <anton@...ba.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Zhaolei <zhaolei@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [RFC][PATCH 5/5] perfcounter: Add support for kernel hardware
 breakpoints

On Tue, 2009-07-28 at 10:04 -0400, Mathieu Desnoyers wrote:

> As you see, none of these 2 ways to gather trace data allow statistical
> RR. Therefore, having this feature in the low-level API does not seem to
> make sense for tracing.

I'm not asking for it to be available in the low level API. Quite
contrary, I'm saying that the current API is too high level and pretty
useless for perf counters.



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