linux-kernel - Re: [PATCH 2/2] perf, x86: Use INTEL_FLAGS_UEVENT

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Message-ID: <20140910142232.GC4783@worktop.ger.corp.intel.com>
Date:	Wed, 10 Sep 2014 16:22:32 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	mingo@...nel.org, eranian@...gle.com, tglx@...utronix.de
Subject: Re: [PATCH 2/2] perf, x86: Use INTEL_FLAGS_UEVENT_CONSTRAINT for
 PRECDIST

On Wed, Sep 10, 2014 at 07:02:58AM -0700, Andi Kleen wrote:
> On Wed, Sep 10, 2014 at 09:59:26AM +0200, Peter Zijlstra wrote:
> > On Tue, Sep 09, 2014 at 05:49:08PM -0700, Andi Kleen wrote:
> > > From: Andi Kleen <ak@...ux.intel.com>
> > > 
> > > The earlier commit 86a04461a made near all PEBS on
> > > Sandy/IvyBridge/Haswell to reject non zero flags.
> > 
> > What's magic about nehalem and westmere?
> 
> I wasn't able to confirm their behavior explicitly, so I felt
> it best to leave them alone.
> 
> But in principle adding the _FLAGS changes there too would
> make sense too.

Yeah please do that patch ASAP, having PEBS behave differently across
uarchs is wrong.
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