linux-kernel - Re: [RFC] Unify KVM kernel-space and user-space code into a single project

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Message-ID: <20100318134457.GH22775@redhat.com>
Date:	Thu, 18 Mar 2010 13:44:57 +0000
From:	"Daniel P. Berrange" <berrange@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Avi Kivity <avi@...hat.com>, "Frank Ch. Eigler" <fche@...hat.com>,
	Alexander Graf <agraf@...e.de>,
	Anthony Liguori <anthony@...emonkey.ws>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Sheng Yang <sheng@...ux.intel.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	oerg Roedel <joro@...tes.org>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>, ziteng.huang@...el.com,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Fr?d?ric Weisbecker <fweisbec@...il.com>
Subject: Re: [RFC] Unify KVM kernel-space and user-space code into a single project

On Thu, Mar 18, 2010 at 02:31:24PM +0100, Ingo Molnar wrote:
> 
> * Avi Kivity <avi@...hat.com> wrote:
> 
> > On 03/18/2010 03:02 PM, Ingo Molnar wrote:
> > >
> > >> [...] What users eagerly replace their kernels?
> > >
> > > Those 99% who click on the 'install 193 updates' popup.
> > >
> > 
> > Of which 1 is the kernel, and 192 are userspace updates (of which one may be 
> > qemu).
> 
> I think you didnt understand my (tersely explained) point - which is probably 
> my fault. What i said is:
> 
>  - distros update the kernel first. Often in stable releases as well if 
>    there's a new kernel released. (They must because it provides new hardware
>    enablement and other critical changes they generally cannot skip.)
> 
>  - Qemu on the other hand is not upgraded with (nearly) that level of urgency.
>    Completely new versions will generally have to wait for the next distro
>    release.

This has nothing todo with them being in separate source repos. We could
update QEMU to new major feature releaes with the same frequency in a Fedora
release, but we delibrately choose not to rebase the QEMU userspace because 
experiance has shown the downside from new bugs / regressions outweighs the
benefit of any new features.

The QEMU updates in stable Fedora trees, now just follow the minor bugfix
release stream provided by QEMU & those arrive in Fedora with little
noticable delay.

Daniel
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