From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Jackson Subject: Re: [PATCH 1 of 3 v5/leftover] libxl: enable automatic placement of guests on NUMA nodes [and 1 more messages] Date: Wed, 18 Jul 2012 11:53:21 +0100 Message-ID: <20486.38305.369947.333430@mariner.uk.xensource.com> References: <0411b2cebd725b193465.1341932614@Solace> <20485.35590.105351.434937@mariner.uk.xensource.com> <5fa66c8b9093399e5bc3.1342458792@Solace> <20485.43293.833036.352186@mariner.uk.xensource.com> <1342570947.11794.92.camel@Abyss> <1342602839.26734.6.camel@zakaz.uk.xensource.com> <1342604616.19530.123.camel@Solace> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1342604616.19530.123.camel@Solace> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Dario Faggioli Cc: Andre Przywara , Ian Campbell , Stefano Stabellini , George Dunlap , Juergen Gross , xen-devel List-Id: xen-devel@lists.xenproject.org Dario Faggioli writes ("Re: [PATCH 1 of 3 v5/leftover] libxl: enable automatic placement of guests on NUMA nodes [and 1 more messages]"): ... > So basically I'm saying that it does have that property but that is > bringing benefits right now, and we have all the knobs to limit its > potential nasty effects for future (bigger) system at any time. I think that it is essential that we do not have a situation where the default behaviour is ever to hang while it searches zillions of combinations. That would be a release critical bug IMO. So I don't think "we will fix this after the series goes in" is acceptable. We should not be introducing new RC bugs during the freeze. > What could be done is restricting automatic placement to guests that > fits on 4 or 8 nodes for 4.2. Then, for 4.3 (and with a very small > backport effort to 4.2.1), implement a lighter solution for dealing with > the ones that does not. That would be acceptable. Ian.