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Message-Id: <1248765877.6987.2754.camel@twins>
Date: Tue, 28 Jul 2009 09:24:37 +0200
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
To: Frederic Weisbecker <fweisbec@...il.com>
Cc: 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>,
Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
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 03:03 +0200, Frederic Weisbecker wrote:
> > Thirdly, we can multiplex perf counters beyond their hardware maximum,
> > something you simply cannot do for a debug interface.
>
>
> Again, I'm stuck in what you mean by multiplexing here :-)
If you'd create say 16 breakpoint counters, we'd RR them over the 4
available hardware breakpoints (or less when others are taken by someone
else).
Since its all statistics anyway, we can simply scale the event counts up
by the time-share they received.
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