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xen-users
[Xen-users] Re: Xen is a feature
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To: |
Bill Davidsen <davidsen@xxxxxxx> |
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Subject: |
[Xen-users] Re: Xen is a feature |
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From: |
Thomas Gleixner <tglx@xxxxxxxxxxxxx> |
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Date: |
Wed, 3 Jun 2009 22:20:02 +0200 (CEST) |
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Cc: |
ksrinivasan <ksrinivasan@xxxxxxxxxx>, "jeremy@xxxxxxxx" <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "wimcoekaerts@xxxxxxxxxxxx" <wimcoekaerts@xxxxxxxxxxxx>, "gregkh@xxxxxxx" <gregkh@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxxxxx>, "kurt.hackel@xxxxxxxxxx" <kurt.hackel@xxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, Stephen Spector <stephen.spector@xxxxxxxxxx>, "avi@xxxxxxxxxx" <avi@xxxxxxxxxx>, "EAnderson@xxxxxxxxxx" <EAnderson@xxxxxxxxxx>, jens.axboe@xxxxxxxxxx, "mingo@xxxxxxx" <mingo@xxxxxxx>, "torvalds@xxxxxxxxxxxxxxxxxxxx" <torvalds@xxxxxxxxxxxxxxxxxxxx>, David Miller <davem@xxxxxxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx> |
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Alpine 2.00 (LFD 1167 2008-08-23) |
On Wed, 3 Jun 2009, Bill Davidsen wrote:
> Thomas Gleixner wrote:
> > Aside of the paravirt, which seems to expand through arch/x86 like a
> > hydra, the new patches sprinkle "if (xen_...)" all over the
> > place. These extra xen dependencies are no improvement, they are a
> > royal pain in the ... They are sticky once they got merged simply
> > because the hypervisor relies on them and we need to provide
> > compatibility for a long time.
> >
> Wait, let's not classify something as "no improvement" when you mean "I don't
> need it."
It's not about "I don't need it.". It's about having Xen dependencies
in the code all over the place which make mainatainence harder. I have
to balance the users benefit (xen dom0 support) vs. the impact on
maintainability and the restrictions which are going to be set almost
in stone by merging it.
> Let's stick to technical issues, and not deny that there are a number of users
> who really will have expanded capability. The technical points are valid, but
> as a former and probable future xen (CentOS) user, so are the benefits.
Refusing random "if (xen...)" dependencies is a purely technical
decision. I have said more than once that I'm not against merging dom0
in general, I'm just frightened by the technical impact of a defacto
ABI which we swallow with it.
We have enough problems with real silicon and BIOS/ACPI already, why
should we add artifical and _avoidable_ virtual silicon horror ?
Thanks,
tglx
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