linux-kernel - Re: [Qemu-devel] [PATCH] KVM: Add wrapper script around QEMU to test kernels

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Message-ID: <20111107203514.GG24234@thunk.org>
Date:	Mon, 7 Nov 2011 15:35:14 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	"Frank Ch. Eigler" <fche@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	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: [Qemu-devel] [PATCH] KVM: Add wrapper script around QEMU to
 test kernels

On Mon, Nov 07, 2011 at 10:09:34PM +0200, Pekka Enberg wrote:
> 
> I guess for perf ABI, "perf test" is the closest thing to a
> specification so if your application is using something that's not
> covered by it, you might be in trouble.

I don't believe there's ever been any guarantee that "perf test" from
version N of the kernel will always work on a version N+M of the
kernel.  Perhaps I am wrong, though. If that is a guarantee that the
perf developers are willing to stand behind, or have already made, I
would love to be corrected and would be delighted to hear that in fact
there is a stable, backwards compatible perf ABI.

Regards,

						- Ted
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