From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Wright Subject: Re: [RFC PATCH] Exporting Guest RAM information for NUMA binding Date: Wed, 30 Nov 2011 08:33:27 -0800 Message-ID: <20111130163327.GD13696@sequoia.sous-sol.org> References: <20111108173304.GA14486@sequoia.sous-sol.org> <20111121150054.GA3602@in.ibm.com> <1321889126.28118.5.camel@twins> <20111121160001.GB3602@in.ibm.com> <1321894980.28118.16.camel@twins> <4ECB0019.7020800@codemonkey.ws> <20111123150300.GH8397@redhat.com> <4ECD3CBD.7010902@suse.de> <20111130162237.GC27308@in.ibm.com> <1322670315.2921.288.camel@twins> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Andrea Arcangeli , kvm list , dipankar@in.ibm.com, Alexander Graf , qemu-devel Developers , Chris Wright , bharata@linux.vnet.ibm.com, Vaidyanathan S To: Peter Zijlstra Return-path: Content-Disposition: inline In-Reply-To: <1322670315.2921.288.camel@twins> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org Sender: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org List-Id: kvm.vger.kernel.org * Peter Zijlstra (a.p.zijlstra@chello.nl) wrote: > On Wed, 2011-11-30 at 21:52 +0530, Dipankar Sarma wrote: > > > > Also, if at all topology changes due to migration or host kernel decisions, > > we can make use of something like VPHN (virtual processor home node) > > capability on Power systems to have guest kernel update its topology > > knowledge. You can refer to that in > > arch/powerpc/mm/numa.c. > > I think that fail^Wfeature of PPC is terminally broken. You simply > cannot change the topology after the fact. Agreed, there's too many things that consult topology once and never look back.