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

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Message-Id: <1248111537.15751.9341.camel@twins>
Date:	Mon, 20 Jul 2009 19:38:57 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	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>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	"K . Prasad" <prasad@...ux.vnet.ibm.com>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [RFC][PATCH 5/5] perfcounter: Add support for kernel hardware
 breakpoints

On Mon, 2009-07-20 at 13:08 -0400, Frederic Weisbecker wrote:
> This adds the support for kernel hardware breakpoints in perfcounter.
> It is added as a new type of software counter and can be defined by
> using the counter number 5 and by passsing the address of the
> breakpoint to set through the config attribute.

This seems to be IP based breakpoints. Are there plans for data based
breakpoints as well? In that case we might want to think about the
namespace issue, we cannot both call them breakpoint/bp etc.. ;-)

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