linux-kernel - Re: [PATCH] RFC: perf, tools: Move gtk browser into separate perfgtk executable

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Date:	Tue, 13 Aug 2013 17:57:16 -0400 (EDT)
From:	Vince Weaver <vince@...ter.net>
To:	Ingo Molnar <mingo@...nel.org>
cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>,
	Namhyung Kim <namhyung.kim@....com>, peterz@...radead.org
Subject: Re: [PATCH] RFC: perf, tools: Move gtk browser into separate perfgtk
 executable

On Tue, 13 Aug 2013, Ingo Molnar wrote:

> 
> that can only be addressed by either extending 'perf test' or by testing 
> libpfm et al sooner. The upstream kernel can only address regressions that 
> get reported.

Most of the tests in my test-suite are reactive.  Meaning, I wrote them 
after an ABI-breaking change was reported elsewhere, and I needed a small 
test case for bisection purposes.  Thus they are good for finding if a 
corner of the perf ABI re-breaks but they're not great at spotting new 
breakages.

Writing a complete test suite for something as complicated as the 
perf-event ABI is impractical.  One thing you can do is require anyone 
submitting new functionality also provide a regression test, but
I don't see that happening.

Another issue is that despite having some ABI definitions for files in 
/sys, these are broken with impunity.  And I've yet to have an 
ABI-breaking changeset reverted based on my bug reports.  So you can see 
why I'm not really motivated to even bother trying, as it seems like it 
would be pointless busy work at this point.

It would just be nice if we just straight out say "the ABI is whatever 
lets the perf tool run.  Anything else is undefined behavior and shouldn't 
be relied on".

Vince
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