From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933887AbbIVQW7 (ORCPT ); Tue, 22 Sep 2015 12:22:59 -0400 Received: from smtp.citrix.com ([66.165.176.89]:29856 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933729AbbIVQW5 (ORCPT ); Tue, 22 Sep 2015 12:22:57 -0400 X-IronPort-AV: E=Sophos;i="5.17,573,1437436800"; d="scan'208";a="301621486" Subject: Re: [Xen-devel] [PATCH RFC] xen: if on Xen, "flatten" the scheduling domain hierarchy To: Juergen Gross , Dario Faggioli References: <1439913332.4239.134.camel@citrix.com> <55D61964.90608@suse.com> <1442335855.7789.45.camel@citrix.com> <55FF9A50.9040505@suse.com> <5600DC4B.1000509@suse.com> CC: "xen-devel@lists.xenproject.org" , "Andrew Cooper" , "Luis R. Rodriguez" , linux-kernel , "David Vrabel" , Boris Ostrovsky , Stefano Stabellini From: George Dunlap Message-ID: <56018050.1010009@citrix.com> Date: Tue, 22 Sep 2015 17:22:40 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: <5600DC4B.1000509@suse.com> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit X-DLP: MIA2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/22/2015 05:42 AM, Juergen Gross wrote: > One other thing I just discovered: there are other consumers of the > topology sibling masks (e.g. topology_sibling_cpumask()) as well. > > I think we would want to avoid any optimizations based on those in > drivers as well, not only in the scheduler. I'm beginning to lose the thread of the discussion here a bit. Juergen / Dario, could one of you summarize your two approaches, and the (alleged) advantages and disadvantages of each one? Thanks, -George