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

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Date:	Wed, 24 Jul 2013 14:54:49 -0400 (EDT)
From:	Vince Weaver <vince@...ter.net>
To:	Sasha Levin <sasha.levin@...cle.com>
cc:	Andi Kleen <andi@...stfloor.org>, 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 Tue, 23 Jul 2013, Sasha Levin wrote:

> It's probably fine to change a testing ABI once in a while, but when things
> like trinity start breaking that often due to ABI changes in the same exact
> place, that's too much IMO.

The problem is they want the ABI to be "whatever our closely-coupled 
userspace perf tool accepts as input" which is an often-changing 
complicated (and undocumented) set of LEX and YACC parsers.

I guess we could just give in and declare that to be the official 
perf sysfs interface in the ABI documentation.  

It's frustrating trying to maintain tools that use the perf_event 
interface because the inclusion of perf in the kernel is used as an excuse 
to constantly break the ABI.

Vince
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