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Date: Fri, 18 Jul 2014 16:16:48 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Bruno Wolff III <bruno@...ff.to> Cc: Dietmar Eggemann <dietmar.eggemann@....com>, Josh Boyer <jwboyer@...hat.com>, "mingo@...hat.com" <mingo@...hat.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de> Subject: Re: Scheduler regression from caffcdd8d27ba78730d5540396ce72ad022aff2c 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@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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