linux-kernel - Re: Xen is a feature

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Date:	Thu, 04 Jun 2009 09:31:56 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	George Dunlap <george.dunlap@...citrix.com>
CC:	Frans Pop <elendil@...net.nl>, Bill Davidsen <davidsen@....com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"jeremy@...p.org" <jeremy@...p.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	"avi@...hat.com" <avi@...hat.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Keir Fraser <Keir.Fraser@...citrix.com>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"kurt.hackel@...cle.com" <kurt.hackel@...cle.com>,
	Ian Pratt <Ian.Pratt@...citrix.com>,
	"xen-users@...ts.xensource.com" <xen-users@...ts.xensource.com>,
	ksrinivasan <ksrinivasan@...ell.com>,
	"EAnderson@...ell.com" <EAnderson@...ell.com>,
	"wimcoekaerts@...mekes.net" <wimcoekaerts@...mekes.net>,
	Stephen Spector <stephen.spector@...rix.com>,
	"jens.axboe@...cle.com" <jens.axboe@...cle.com>
Subject: Re: Xen is a feature

George Dunlap wrote:
> Frans Pop wrote:
> 
>>! The kernel policy always was and still is to accept only those
>>! features which have a technical benefit **to the code base**.

> If (hypothetically) we merged Xen into Linux, then (people are 
> suggesting) the coolness of Xen would actually contribute to the 
> coolness of Linux ("add technical benefit to the code base").  People 
> would feel like working on the interface between linux-xen and the rest 
> of linux would be making their own piece of software, Linux, work 
> better, rather than feeling like they have to work with some foreign 
> project that doesn't make their code any cooler.

I suspect that there is an element of this.

There is also the factor that if Xen was merged into linux, we would
then be able to work towards a sane(r) virtualization layer that would
be useful for KVM, Xen, and possibly others.  This provides a technical
benefit to the code base by introducing a more logical organization
rather than having ad-hoc changes sprinkled all over.

Chris

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