linux-kernel - Re: [patch] Performance Counters for Linux, v3

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Date:	Mon, 15 Dec 2008 21:58:10 +0100
From:	"stephane eranian" <eranian@...glemail.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Vince Weaver" <vince@...ter.net>, linux-kernel@...r.kernel.org,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"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>, "Paul Mackerras" <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [patch] Performance Counters for Linux, v3

Hi,

On Mon, Dec 15, 2008 at 12:13 AM, Ingo Molnar <mingo@...e.hu> wrote:
> We've implemented the essence of these variants, with sharing the resource
> being the sane default, and with the sysadmin also having a configuration
> vector to reserve the resource to himself permanently. (There could be
> more variations of this.)
>
Reading the v4 code, it does not appear the sysadmin can specify which
resource to reserve. The current code reserves a number of counters.
This is problematic with hardware where not all counters can measure
everything, or when not all PMU registers are counters.
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