linux-kernel - Re: [PATCH v3] perf: honoring the architectural performance monitoring version

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Message-ID: <20150616092136.GL3644@twins.programming.kicks-ass.net>
Date:	Tue, 16 Jun 2015 11:21:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Imre Palik <imrep.amz@...il.com>
Cc:	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, "Palik, Imre" <imrep@...zon.de>,
	Anthony Liguori <aliguori@...zon.com>
Subject: Re: [PATCH v3] perf: honoring the architectural performance
 monitoring version

On Mon, Jun 15, 2015 at 04:22:32PM +0200, Imre Palik wrote:
> From: "Palik, Imre" <imrep@...zon.de>
> 
> Architectural performance monitoring version 1 doesn't support fixed
> counters.  Currently, even if a hypervisor advertises support for
> architectural performance monitoring version 1, perf may still tries to use
> the fixed counters, as the constraints are set up based on the CPU model.
> 
> This patch ensures that perf honors the architectural performance
> monitoring version returned by CPUID, and it only uses the fixed counters
> for version two and above.
> 
> Some of the ideas in this patch are coming from Peter Zijlstra.

What's the difference from -v2? I'm not really seeing it.
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