linux-kernel - Re: [PATCH] perf, x86: add Intel IvyBridge event scheduling constraints

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Message-ID: <CABPqkBSDma_=MGWAcG_6d04r_7XOxxjRg3ju69Oz8OFzKcDXxA@mail.gmail.com>
Date:	Thu, 21 Feb 2013 11:35:17 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH] perf, x86: add Intel IvyBridge event scheduling constraints

On Wed, Feb 20, 2013 at 11:08 PM, Andi Kleen <ak@...ux.intel.com> wrote:
>> > Except for LDM_PENDING the CYCLE_ACTIVITY events have been also added to Sandy Bridge.
>> > So it should be also added there.
>> >
>> As far as I know and I double-checked the documentation I have, there
>> is no CYCLE_ACTIVITY
>> event on SNB or SNB-EP.
>
> page 19-28 in the Jan 2013 SDM. It was only recently added.
> It's only a subset of what you have on Ivy Bridge.
>
I have confirmed that this is a typo in the SDM. This event is not
available on SandyBridge.

>>
>> > In fact I think you can still share the table because it would just add some
>> > non existent events to Sandy Bridge, which is a noop.
>> >
>> I don't see the point of this, except saving a few bytes. Isn't it
>> better to keep each PMU separate?
>
> Ok, as long as you update the SNB table too.
>
> -Andi
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