linux-kernel - Re: [patch] Performance Counters for Linux, v2

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Message-ID: <20081210102620.GE23556@one.firstfloor.org>
Date:	Wed, 10 Dec 2008 11:26:20 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	eranian@...il.com, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-arch@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	Robert Richter <robert.richter@....com>,
	Arjan van de Veen <arjan@...radead.org>,
	Peter Anvin <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Miller <davem@...emloft.net>,
	Paolo Ciarrocchi <paolo.ciarrocchi@...il.com>
Subject: Re: [patch] Performance Counters for Linux, v2

On Wed, Dec 10, 2008 at 03:44:31PM +1100, Paul Mackerras wrote:
> Andi Kleen writes:
> 
> > When you say counting you should also include "event ring buffers with
> > metadata", like PEBS on Intel x86. 
> 
> I'm not familiar with PEBS.  Maybe it's something different again,
> neither sampling nor counting, but a third thing?

Yes it's a third thing. A CPU controlled ring event buffer. See Stephane's 
description.

There's also some crosses, e.g. AMD's IBS (which is essentially a counter +
some additional registers to give more details about the interrupted
instruction)

-Andi

-- 
ak@...ux.intel.com
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