From: Peter Zijlstra <peterz@infradead.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: mingo@kernel.org, linux-kernel@vger.kernel.org,
eranian@google.com, acme@redhat.com, namhyung@kernel.org,
jolsa@redhat.com, Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH 1/2] perf, x86: Disallow setting undefined bits for PEBS events
Date: Fri, 14 Mar 2014 09:13:38 +0100 [thread overview]
Message-ID: <20140314081338.GL27965@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1394745733-27855-1-git-send-email-andi@firstfloor.org>
On Thu, Mar 13, 2014 at 02:22:12PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@linux.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.
next prev parent reply other threads:[~2014-03-14 8:13 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-13 21:22 Andi Kleen
2014-03-13 21:22 ` [PATCH 2/2] perf, x86: Don't mark DataLA addresses as store Andi Kleen
2014-03-14 8:13 ` Peter Zijlstra [this message]
2014-03-14 13:54 ` [PATCH 1/2] perf, x86: Disallow setting undefined bits for PEBS events Andi Kleen
2014-03-14 16:21 ` Peter Zijlstra
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