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

From: Vince Weaver
Date: Wed Jul 24 2013 - 14:30:54 EST

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.

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