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

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Date:	Wed, 24 Jul 2013 14:31:44 -0400 (EDT)
From:	Vince Weaver <vince@...ter.net>
To:	Andi Kleen <andi@...stfloor.org>
cc:	Sasha Levin <sasha.levin@...cle.com>,
	Andi Kleen <ak@...ux.intel.com>, acme@...radead.org,
	mingo@...nel.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	torvalds@...ux-foundation.org, trinity@...r.kernel.org
Subject: Re: [PATCH 1/2] tools, perf: Add a precise event qualifier v2

On Wed, 24 Jul 2013, Andi Kleen wrote:

> On Tue, Jul 23, 2013 at 08:39:09PM -0400, Sasha Levin wrote:
> It sounds like trinity is breaking (well printing a message, not really
> breaking) on any addition. So if we follow that the perf sysfs interface
> would be completely frozen and can never be extended over today.

Trinity is breaking on any *ABI-breaking* additions.
You can add arbitrary fields to sysfs events/* as long as there's
a corresponding format/* entry.

> I don't think it's a big problem that a test tool needs to be extended
> when the software it's testing changes.

Trinity isn't the only tool that would break, I just picked it as an 
example because it's one that kernel devs have likely heard of.

Vince
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