linux-kernel - Re: [PATCH 1/2] tools, perf: Add a precise event qualifier v2

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Date:	Tue, 23 Jul 2013 01:40:40 -0400 (EDT)
From:	Vince Weaver <vince@...ter.net>
To:	Andi Kleen <andi@...stfloor.org>
cc:	acme@...radead.org, mingo@...nel.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 1/2] tools, perf: Add a precise event qualifier v2

On Mon, 22 Jul 2013, Andi Kleen wrote:

> From: Andi Kleen <ak@...ux.intel.com>
> 
> Add a precise qualifier, like cpu/event=0x3c,precise=1/

So you're adding this to "events/" but not to "format/"?

This breaks the ABI, which specifies that the only fields
that can appear in a sysfs events specifier must exist under
the format directory.

This was what I worried about when I said people are going to start 
leaking perf tool specific events into the kernel sysfs tree.

This will break various existing programs.

Vince
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