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

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Message-Id: <1248354493.26273.2.camel@twins>
Date:	Thu, 23 Jul 2009 15:08:13 +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.

Is there a limit to these hardware breakpoints? If so, the software
counter model is not sufficient, since we assume we can always schedule
all software counters. However if you were to add more counters than you
have hardware breakpoints you're hosed.

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