linux-kernel - Re: [RFC/PATCH] perf: Expand definition of sysfs format attribute

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Date:	Mon, 8 Apr 2013 17:24:22 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	acme@...radead.org
Cc:	peterz@...radead.org, jolsa@...hat.com,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	rob@...dley.net
Subject: Re: [RFC/PATCH] perf: Expand definition of sysfs format attribute

On Mon, Mar 04, 2013 at 03:21:05PM +1100, Michael Ellerman wrote:
> Make it explicit that the format attributes may define overlapping bit
> ranges. Unfortunately this was left unspecified originally, and all the
> examples show non-overlapping ranges. I don't believe this is an ABI
> change, as we are defining something that was previously undefined, but
> others may disagree.
> 
> The POWER8 PMU would like to define overlapping ranges, as bit ranges in
> the event code have different meanings for certain events. It will also
> allow us to define an overarching "event" field, that encompasses all
> others.
> 
> As far as I can see perf is comfortable with this change, however I am
> not sure if there are any other users of the interface.

Any comments on this one?

cheers
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