From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: prasad@linux.vnet.ibm.com, Ingo Molnar <mingo@elte.hu>,
LKML <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
Mike Galbraith <efault@gmx.de>, Paul Mackerras <paulus@samba.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Lai Jiangshan <laijs@cn.fujitsu.com>,
Anton Blanchard <anton@samba.org>, Li Zefan <lizf@cn.fujitsu.com>,
Zhaolei <zhaolei@cn.fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
Alan Stern <stern@rowland.harvard.edu>
Subject: Re: [RFC][PATCH 5/5] perfcounter: Add support for kernel hardware breakpoints
Date: Tue, 28 Jul 2009 09:24:37 +0200 [thread overview]
Message-ID: <1248765877.6987.2754.camel@twins> (raw)
In-Reply-To: <20090728010349.GB5147@nowhere>
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.
next prev parent reply other threads:[~2009-07-28 7:22 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-20 17:08 [RFC][PATCH 0/5] hw-breakpoints: Make the API generic + support for perfcounters Frederic Weisbecker
2009-07-20 17:08 ` [RFC][PATCH 1/5] hw-breakpoints: Make kernel breakpoints API truly generic Frederic Weisbecker
2009-07-20 17:27 ` Mathieu Desnoyers
2009-07-25 2:37 ` Frederic Weisbecker
2009-07-25 15:38 ` Mathieu Desnoyers
2009-07-28 1:35 ` Frederic Weisbecker
2009-07-21 11:15 ` K.Prasad
2009-07-25 2:56 ` Frederic Weisbecker
2009-07-20 17:08 ` [RFC][PATCH 2/5] hw-breakpoints: Pull up the target symbol in a generic field Frederic Weisbecker
2009-07-20 17:08 ` [RFC][PATCH 3/5] hw-breakpoints: Make user breakpoints API truly generic Frederic Weisbecker
2009-07-20 17:08 ` [RFC][PATCH 4/5] perfcounter: Grow the event number to 64 bits Frederic Weisbecker
2009-07-20 17:08 ` [RFC][PATCH 5/5] perfcounter: Add support for kernel hardware breakpoints Frederic Weisbecker
2009-07-20 17:38 ` Peter Zijlstra
2009-07-21 7:11 ` Frédéric Weisbecker
2009-07-20 17:38 ` Peter Zijlstra
2009-07-21 7:19 ` Frédéric Weisbecker
2009-07-20 17:38 ` Peter Zijlstra
2009-07-20 21:22 ` Frédéric Weisbecker
2009-07-24 20:20 ` Masami Hiramatsu
2009-07-23 13:08 ` Peter Zijlstra
2009-07-23 17:45 ` Peter Zijlstra
2009-07-23 19:56 ` Alan Stern
2009-07-24 14:02 ` Frédéric Weisbecker
2009-07-24 14:26 ` Peter Zijlstra
2009-07-24 17:47 ` Frederic Weisbecker
2009-07-25 10:56 ` Peter Zijlstra
2009-07-25 14:19 ` Frederic Weisbecker
2009-07-25 15:51 ` Mathieu Desnoyers
2009-07-25 16:27 ` Peter Zijlstra
2009-07-25 16:22 ` Peter Zijlstra
2009-07-25 23:57 ` K.Prasad
2009-07-27 8:53 ` Peter Zijlstra
2009-07-28 1:03 ` Frederic Weisbecker
2009-07-28 7:24 ` Peter Zijlstra [this message]
2009-07-28 14:04 ` Mathieu Desnoyers
2009-07-28 14:42 ` Peter Zijlstra
2009-07-29 0:36 ` Frederic Weisbecker
2009-07-29 8:28 ` Peter Zijlstra
2009-07-29 14:03 ` Frederic Weisbecker
2009-07-28 16:12 ` K.Prasad
2009-07-28 16:41 ` Peter Zijlstra
2009-07-29 6:37 ` K.Prasad
2009-07-29 9:22 ` Peter Zijlstra
2009-07-29 14:57 ` Arnaldo Carvalho de Melo
2009-07-28 0:18 ` Frederic Weisbecker
2009-07-28 7:26 ` Peter Zijlstra
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