linux-kernel - Re: [F.A.Q.] perf ABI backwards and forwards compatibility

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Date:	Tue, 8 Nov 2011 13:15:01 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	"Frank Ch. Eigler" <fche@...hat.com>, Ted Ts'o <tytso@....edu>,
	Vince Weaver <vince@...ter.net>,
	Pekka Enberg <penberg@...nel.org>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Avi Kivity <avi@...hat.com>,
	"kvm@...r.kernel.org list" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
	qemu-devel Developers <qemu-devel@...gnu.org>,
	Alexander Graf <agraf@...e.de>,
	Blue Swirl <blauwirbel@...il.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [F.A.Q.] perf ABI backwards and forwards compatibility


* Pekka Enberg <penberg@...helsinki.fi> wrote:

> [...] There's an easy fix for this too: improve "perf test" to 
> cover the cases you're intested in. While ABI spec would be a nice 
> addition, it's not going to make compatibility problems magically 
> go away.

Yes, exactly - 'perf test' has been written with that exact purpose. 
In practice 'perf' will cover almost all parts of the ABI.

The one notable thing that isnt being tested in a natural way is the 
'group of events' abstraction - which, ironically, has been added on 
the perfmon guys' insistence. No app beyond the PAPI self-test makes 
actual use of it though, which results in an obvious lack of testing.

Vince: the code is in tools/perf/builtin-test.c and our offer still 
stands, feel free to extend it. Maybe there's some other volunteer 
willing to do that?

Thanks,

	Ingo
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