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Re: [Xen-devel] address space reorganization
| To: | Jacob Gorm Hansen <jacobg@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] address space reorganization |
| From: | Kip Macy <kip.macy@xxxxxxxxx> |
| Date: | Wed, 13 Apr 2005 20:14:19 -0700 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Thu, 14 Apr 2005 03:15:45 +0000 |
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| Reply-to: | Kip Macy <kip.macy@xxxxxxxxx> |
| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
> > That works OK for the kernel, but you might have user space apps that
> > have adapted their behviour based on what the've found in /proc/cpuinfo.
>
> A compromise then would be to lie to userspace and still recalibrate the
> kernel.
If you're saying what I think you are - I don't think people who have
customized their apps for SSE2 would like that.
You'll either have to have xend propagate a bitmask of the cpuid
capabilities so that xfrd won't migrate it or you tell users that "the
behaviour is undefined" if they use migration in a heterogeneous
cluster.
-Kip
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