linux-kernel - Re: getting processor numbers

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Message-ID: <20070403173010.GC23689@one.firstfloor.org>
Date:	Tue, 3 Apr 2007 19:30:10 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Ulrich Drepper <drepper@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: getting processor numbers

On Tue, Apr 03, 2007 at 06:22:41PM +0100, Alan Cox wrote:
> > benefit for the common use cases.  But as it is, the number of
> > processors is not necessarily constant over the lifetime of a process.
> > The machine architecture is.
> 
> Not once you have migration capable virtualisation it isnt.

Migration is fundamentally incompatible with many CPU optimizations.
But that's not a reason to not optimize anymore.

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

-Andi
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