linux-kernel - Re: getting processor numbers

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Message-ID: <4612B7EF.4080100@goop.org>
Date:	Tue, 03 Apr 2007 13:24:15 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ulrich Drepper <drepper@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: getting processor numbers

Andi Kleen wrote:
> Migration is fundamentally incompatible with many CPU optimizations.
> But that's not a reason to not optimize anymore.
>   

I've been thinking about ways in which Xen could provide the current
vcpu->cpu map to guest domains.  Obviously this would change over time,
but it could remain current enough to be useful.

> But I guess luckily most migration users will be able to live
> with a little decreased performance after it.
>   

At least in the Xen case, the source and target machines need to be
fairly similar in architecture (can't deal with vastly different CPU
types, for example).

    J
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