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

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Date:	Mon, 12 Aug 2013 15:25:33 -0400 (EDT)
From:	Vince Weaver <vince@...ter.net>
To:	Ingo Molnar <mingo@...nel.org>
cc:	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	acme@...radead.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 Mon, 12 Aug 2013, Ingo Molnar wrote:

> perf is the exact opposite: no split-up the development culture because 
> they are closely related, yet a relatively disciplined ABI between the 
> components. In fact the ABI is higher quality exactly because development 
> is more integrated and allows for ABI problems to be resolved before they 
> leak out. It also allows for faster iteration of development, without 
> nonsensical ABI steps pulluting the way.

I don't know if I'd use "quality" and "perf ABI" in the same sentence.
It's a horrible ABI; it has the honor of having the longest syscall
manpage, beating out even ptrace.

It also really isn't that stable; I've had perf ABI changes break programs 
I maintain at least three times in the last 2 kernel releases.  Part of 
this is due to the tight coupling into the kernel, in fact the only ABI 
anyone seems to care about is that presented by the perf-tool CLI 
interface; the _actual_ kernel ABI seems like an afterthought.

Vince
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