linux-kernel - Re: [PATCH 3/3] perf, uncore: enable ev_sel

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Message-ID: <20130812152957.GF23412@tassilo.jf.intel.com>
Date:	Mon, 12 Aug 2013 08:29:57 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Yan, Zheng" <zheng.z.yan@...el.com>, linux-kernel@...r.kernel.org,
	eranian@...gle.com
Subject: Re: [PATCH 3/3] perf, uncore: enable ev_sel_ext bit for PCU.

On Mon, Aug 12, 2013 at 05:16:32PM +0200, Peter Zijlstra wrote:
> On Wed, Aug 07, 2013 at 02:17:25PM +0800, Yan, Zheng wrote:
> > From: "Yan, Zheng" <zheng.z.yan@...el.com>
> > 
> > PCU uncore event control register has a undocumented ev_sel_ext bit.
> > The bit is needed by Andi's pmu-tools.
> 
> Please provide documentation. Andi needing it isn't a good changelog (or
> even reason).

The bit is in the uncore guide, just not in the register documentation,
but in the event descriptions.

e.g. the PCU part calls it "Extra Select Bit"

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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