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

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Message-ID: <alpine.LFD.2.02.1111081327350.18135@tux.localdomain>
Date:	Tue, 8 Nov 2011 13:29:46 +0200 (EET)
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Theodore Tso <tytso@....EDU>
cc:	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 Tue, 8 Nov 2011, Theodore Tso 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!

You just yourself said it's about the people. Why do you now think it's 
about linking against the kernel? I know I have hacked on various parts of 
the kernel that I have never linked to my kernel.

 			Pekka
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