linux-kernel - Re: [PATCH 1/2] perf, x86: Disallow setting undefined bits for PEBS events

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Message-ID: <20140314081338.GL27965@twins.programming.kicks-ass.net>
Date:	Fri, 14 Mar 2014 09:13:38 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org, eranian@...gle.com,
	acme@...hat.com, namhyung@...nel.org, jolsa@...hat.com,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/2] perf, x86: Disallow setting undefined bits for PEBS
 events

On Thu, Mar 13, 2014 at 02:22:12PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> The SDM forbids setting various event qualifiers with PEBS
> events. The magic cycles:pp event uses it, but it has caused
> problems in the past. We continue allowing it for cycles:pp,
> but forbid it for all other events to follow the SDM.

Last time this came up I asked for what kind of problems it caused.

No answer then I think, and certainly no answer now.

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