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

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Message-ID: <493E9F3E.3020902@nortel.com>
Date:	Tue, 09 Dec 2008 10:39:26 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	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>,
	Paul Mackerras <paulus@...ba.org>,
	Paolo Ciarrocchi <paolo.ciarrocchi@...il.com>
Subject: Re: [patch] Performance Counters for Linux, v2

Ingo Molnar wrote:

> When there are two (or more) hw metrics to profile, the ideally best 
> (i.e. the statistically most stable and most relevant) sampling for the 
> two statistical variables (say of l2_misses versus l2_accesses) is to 
> sample them independently, via their own metric. Not via a static 1khz 
> rate - or via picking one of the variables to generate samples.

Regardless of sampling method, don't you still want some way to 
enable/disable the various counters as close to simultaneously as possible?

Chris
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