From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932540AbdDFKsJ (ORCPT ); Thu, 6 Apr 2017 06:48:09 -0400 Received: from merlin.infradead.org ([205.233.59.134]:37642 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934590AbdDFKsC (ORCPT ); Thu, 6 Apr 2017 06:48:02 -0400 Date: Thu, 6 Apr 2017 12:47:57 +0200 From: Peter Zijlstra To: Michal Hocko Cc: Srikar Dronamraju , Ingo Molnar , LKML , Mel Gorman , Rik van Riel Subject: Re: [PATCH] sched: Fix numabalancing to work with isolated cpus Message-ID: <20170406104757.kemq6is6nh6f26fx@hirez.programming.kicks-ass.net> References: <1491326848-5748-1-git-send-email-srikar@linux.vnet.ibm.com> <20170405125743.GB7258@dhcp22.suse.cz> <20170405152215.GA6019@linux.vnet.ibm.com> <20170405164437.GT6035@dhcp22.suse.cz> <20170406071950.GA5843@linux.vnet.ibm.com> <20170406073436.GD5497@dhcp22.suse.cz> <20170406092329.52zzkxlkvitnh44c@hirez.programming.kicks-ass.net> <20170406101348.GH5497@dhcp22.suse.cz> <20170406102957.xz53avexxyiim4az@hirez.programming.kicks-ass.net> <20170406104204.GI5497@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170406104204.GI5497@dhcp22.suse.cz> User-Agent: NeoMutt/20170113 (1.7.2) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 06, 2017 at 12:42:04PM +0200, Michal Hocko wrote: > Is this something dictated by usecases which rely on isolcpus or rather > nobody bothered to implement one scheduling domain? Its from the original use-case I suspect. It was done very much on purpose. If you want bigger partitions use cpusets. Or rather, like I've been saying for many years, use cpusets for everything and kill isolcpus. Problem with that last part is cgroups.. you then need to make a !root cgroup the 'default' cgroup in order to represent that. I really should've done this before all that cgroup crap came along, too late now :/