linux-kernel - Re: [PATCH 1/3] perf, x86: Blacklist all MEM_*

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Message-ID: <20130503170007.GA30733@dyad.programming.kicks-ass.net>
Date:	Fri, 3 May 2013 19:00:07 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, mingo@...nel.org,
	linux-kernel@...r.kernel.org, eranian@...gle.com
Subject: Re: [PATCH 1/3] perf, x86: Blacklist all MEM_*_RETIRED events for IVB

On Fri, May 03, 2013 at 07:35:07AM -0700, Andi Kleen wrote:
> On Fri, May 03, 2013 at 02:11:23PM +0200, Peter Zijlstra wrote:
> > Errata BV98 states that all MEM_*_RETIRED events corrupt the counter
> > value of the SMT sibling's counters. Blacklist these events
> 
> I disagree with this patch. This is just overkill and not needed
> at all.

Then give me a patch that both completely describes the problem and ensures
isolation so that no counters get corrupted (and isn't too invasive).

So far you've failed on both counts.


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