From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jacob Gorm Hansen Subject: Re: address space reorganization Date: Wed, 13 Apr 2005 20:38:18 -0700 Message-ID: <425DE5AA.60105@diku.dk> References: <425DDE90.4070702@diku.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xen-devel List-Id: xen-devel@lists.xenproject.org Kip Macy wrote: >>>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. This is what Keir was suggesting, but still giving the kernel a chance to use SSE[12] for its own purposes. It is not perfect, the only perfect solution would alert user-space apps about the impending change, so that they can react to or veto the migration. Jacob