Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761867AbaGROQs (ORCPT ); Fri, 18 Jul 2014 10:16:48 -0400 Received: from casper.infradead.org ([85.118.1.10]:45257 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761778AbaGROQr (ORCPT ); Fri, 18 Jul 2014 10:16:47 -0400 Date: Fri, 18 Jul 2014 16:16:48 +0200 From: Peter Zijlstra To: Bruno Wolff III Cc: Dietmar Eggemann , Josh Boyer , "mingo@redhat.com" , "linux-kernel@vger.kernel.org" , "H. Peter Anvin" , Thomas Gleixner Subject: Re: Scheduler regression from caffcdd8d27ba78730d5540396ce72ad022aff2c Message-ID: <20140718141648.GE20603@laptop.programming.kicks-ass.net> References: <20140716195414.GA16401@wolff.to> <53C7084C.7090104@arm.com> <20140717030947.GA17889@wolff.to> <53C79013.1020808@arm.com> <20140717090452.GH19379@twins.programming.kicks-ass.net> <53C7B247.2070309@arm.com> <20140717123502.GL19379@twins.programming.kicks-ass.net> <20140718053449.GA2039@wolff.to> <20140718101633.GP9918@twins.programming.kicks-ass.net> <20140718130126.GA2401@wolff.to> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140718130126.GA2401@wolff.to> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 18, 2014 at 08:01:26AM -0500, Bruno Wolff III wrote: > build_sched_domain: cpu: 0 level: SMT cpu_map: 0-3 tl->mask: 0,2 > [ 0.254433] build_sched_domain: cpu: 0 level: MC cpu_map: 0-3 tl->mask: 0 > [ 0.254516] build_sched_domain: cpu: 0 level: DIE cpu_map: 0-3 tl->mask: 0-3 > [ 0.254600] build_sched_domain: cpu: 1 level: SMT cpu_map: 0-3 tl->mask: 1,3 > [ 0.254683] build_sched_domain: cpu: 1 level: MC cpu_map: 0-3 tl->mask: 1 > [ 0.254766] build_sched_domain: cpu: 1 level: DIE cpu_map: 0-3 tl->mask: 0-3 > [ 0.254850] build_sched_domain: cpu: 2 level: SMT cpu_map: 0-3 tl->mask: 0,2 > [ 0.254932] build_sched_domain: cpu: 2 level: MC cpu_map: 0-3 tl->mask: 2 > [ 0.255005] build_sched_domain: cpu: 2 level: DIE cpu_map: 0-3 tl->mask: 0-3 > [ 0.255091] build_sched_domain: cpu: 3 level: SMT cpu_map: 0-3 tl->mask: 1,3 > [ 0.255176] build_sched_domain: cpu: 3 level: MC cpu_map: 0-3 tl->mask: 3 > [ 0.255260] build_sched_domain: cpu: 3 level: DIE cpu_map: 0-3 tl->mask: 0-3 *blink*... That's, shall we say, unexpected. Let me ponder that a bit. HPA any clue why a machine might report such a weird topology? AFAIK threads _always_ share cache. So how can cpu_coregroup_mask be a subset (instead of a superset) of topology_thread_cpumask? Let me go stare at the x86 topology mask setup code. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/