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Date: Fri, 18 Jul 2014 16:16:47 +0200 From: Dietmar Eggemann <dietmar.eggemann@....com> To: Bruno Wolff III <bruno@...ff.to>, Peter Zijlstra <peterz@...radead.org> CC: Josh Boyer <jwboyer@...hat.com>, "mingo@...hat.com" <mingo@...hat.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: Scheduler regression from caffcdd8d27ba78730d5540396ce72ad022aff2c On 18/07/14 15:01, Bruno Wolff III wrote: > On Fri, Jul 18, 2014 at 12:16:33 +0200, > Peter Zijlstra <peterz@...radead.org> wrote: >> So it looks like the actual domain tree is broken, and not what we >> assumed it was. >> >> Could I bother you to run with the below instead? It should also print >> out the sched domain masks so we don't need to guess about them. > > The full dmesg output is at: > https://bugzilla.kernel.org/attachment.cgi?id=143381 > >> (make sure you have CONFIG_SCHED_DEBUG=y otherwise it will not build) >> >>> I also booted with early printk=keepsched_debug as requested by Dietmar. >> >> can you make that: sched_debug ? > > I think I've fixed that. > > I think the part you are most interested in contains the following: > [ 0.252280] smpboot: Total of 4 processors activated (21438.11 BogoMIPS) > [ 0.253058] __sdt_alloc: allocated f255b020 with cpus: > [ 0.253146] __sdt_alloc: allocated f255b0e0 with cpus: > [ 0.253227] __sdt_alloc: allocated f255b120 with cpus: > [ 0.253308] __sdt_alloc: allocated f255b160 with cpus: > [ 0.253390] __sdt_alloc: allocated f255b1a0 with cpus: > [ 0.253471] __sdt_alloc: allocated f255b1e0 with cpus: > [ 0.253551] __sdt_alloc: allocated f255b220 with cpus: > [ 0.253632] __sdt_alloc: allocated f255b260 with cpus: > [ 0.254009] __sdt_alloc: allocated f255b2a0 with cpus: > [ 0.254092] __sdt_alloc: allocated f255b2e0 with cpus: > [ 0.254181] __sdt_alloc: allocated f255b320 with cpus: > [ 0.254262] __sdt_alloc: allocated f255b360 with cpus: > [ 0.254350] 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 So the MC level cpu mask function is wrong on this machine. Should be 0,2 here, right? The cpu_capacity values look strange too (probably a subsequent error). [ 0.257260] CPU0 attaching sched-domain: [ 0.257264] domain 0: span 0,2 level SMT [ 0.257268] groups: 0 (cpu_capacity = 586) 2 (cpu_capacity = 587) [ 0.257275] domain 1: span 0-3 level DIE [ 0.257278] groups: 0 (cpu_capacity = 587) 1 (cpu_capacity = 588) 2 (cpu_capacity = 587) 3 (cpu_capacity = 588) > [ 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 > [ 0.256006] build_sched_groups: got group f255b020 with cpus: > [ 0.256089] build_sched_groups: got group f255b120 with cpus: > [ 0.256171] build_sched_groups: got group f255b1a0 with cpus: > [ 0.256252] build_sched_groups: got group f255b2a0 with cpus: > [ 0.256333] build_sched_groups: got group f255b2e0 with cpus: > [ 0.256414] build_sched_groups: got group f255b320 with cpus: > [ 0.256495] build_sched_groups: got group f255b360 with cpus: > [ 0.256576] build_sched_groups: got group f255b0e0 with cpus: > [ 0.256657] build_sched_groups: got group f255b160 with cpus: > [ 0.256740] build_sched_groups: got group f255b1e0 with cpus: > [ 0.256821] build_sched_groups: FAIL > [ 0.257004] build_sched_groups: got group f255b1a0 with cpus: 0 > [ 0.257087] build_sched_groups: FAIL > [ 0.257167] build_sched_groups: got group f255b1e0 with cpus: 1 > > -- 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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