linux-kernel - Re: [PATCH] perf_events: fix bug in hw_perf

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Message-ID: <1265048422.24455.236.camel@laptop>
Date:	Mon, 01 Feb 2010 19:20:22 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, paulus@...ba.org,
	davem@...emloft.net, fweisbec@...il.com, robert.richter@....com,
	perfmon2-devel@...ts.sf.net, eranian@...il.com,
	Arjan van de Ven <arjan@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] perf_events: fix bug in hw_perf_enable()

On Mon, 2010-02-01 at 18:56 +0100, Stephane Eranian wrote:
> On Mon, Feb 1, 2010 at 6:46 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> > On Mon, 2010-02-01 at 18:23 +0100, Stephane Eranian wrote:
> >> >  244235699509090  raw 0x13c
> >> >  244235695558036  raw 0x13c
> >> >
> >> Strange. I am running mine on a Q6600.
> >> What's yours?
> >
> > These numbers came from a T9400, but my Q9450 does something similar.
> >
> Are you sure you are reading from the correct corresponding data registers?

It sure got me wondering, I'll go over that fixed counter code in
arch/x86/kernel/cpu/perf_event.c in the morning.

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