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

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Message-Id: <924C4E60-08C9-45A1-B0F3-5717BC295726@MIT.EDU>
Date:	Tue, 8 Nov 2011 06:25:43 -0500
From:	Theodore Tso <tytso@....EDU>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Theodore Tso <tytso@....EDU>, Ingo Molnar <mingo@...e.hu>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	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


On Nov 8, 2011, at 6:20 AM, Pekka Enberg wrote:

> We have the staging tree because it's a widely acknowledged belief that kernel code in the tree tends to improve over time compared to code that's sitting out of the tree. Are you disputing that belief?

Kernel code in the kernel source tree improves; because that's where it will eventually end up --- linked against the kernel.

There are all sorts of dynamics in play that don't necessarily apply to userspace code.

Otherwise we could just link in all of the userspace code in a Linux distribution and magically expect it will get better, eh?   Not!

-- Ted

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