linux-kernel - Re: Scheduler regression from caffcdd8d27ba78730d5540396ce72ad022aff2c

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Message-ID: <20140723013719.GA2000@wolff.to>
Date:	Tue, 22 Jul 2014 20:37:19 -0500
From:	Bruno Wolff III <bruno@...ff.to>
To:	Peter Zijlstra <peterz@...radead.org>
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 Tue, Jul 22, 2014 at 16:18:55 +0200,
  Peter Zijlstra <peterz@...radead.org> wrote:
>
>You can put this on top of them. I hope that this will make the pr_err()
>introduced in the robustify patch go away.

I went to 3.16-rc6 and then reapplied three patches from your previous 
email messages. The dmesg output and the diff from 3.16-rc6 have been 
added to https://bugzilla.kernel.org/show_bug.cgi?id=80251 .
The dmesg output is at: https://bugzilla.kernel.org/attachment.cgi?id=143961
The combined diff is at: https://bugzilla.kernel.org/attachment.cgi?id=143971

What I think you are probably looking for in the dmesg output:
[    0.251061] __sdt_alloc: allocated f515b020 with cpus: 
[    0.251149] __sdt_alloc: allocated f515b0e0 with cpus: 
[    0.251231] __sdt_alloc: allocated f515b120 with cpus: 
[    0.251313] __sdt_alloc: allocated f515b160 with cpus: 
[    0.251397] __sdt_alloc: allocated f515b1a0 with cpus: 
[    0.251479] __sdt_alloc: allocated f515b1e0 with cpus: 
[    0.251561] __sdt_alloc: allocated f515b220 with cpus: 
[    0.251643] __sdt_alloc: allocated f515b260 with cpus: 
[    0.252011] __sdt_alloc: allocated f515b2a0 with cpus: 
[    0.252095] __sdt_alloc: allocated f515b2e0 with cpus: 
[    0.252184] __sdt_alloc: allocated f515b320 with cpus: 
[    0.252266] __sdt_alloc: allocated f515b360 with cpus: 
[    0.252355] build_sched_domain: cpu: 0 level: SMT cpu_map: 0-3 tl->mask: 0,2
[    0.252441] build_sched_domain: cpu: 0 level: MC cpu_map: 0-3 tl->mask: 0,2
[    0.252526] build_sched_domain: cpu: 0 level: DIE cpu_map: 0-3 tl->mask: 0-3
[    0.252611] build_sched_domain: cpu: 1 level: SMT cpu_map: 0-3 tl->mask: 1,3
[    0.252696] build_sched_domain: cpu: 1 level: MC cpu_map: 0-3 tl->mask: 1,3
[    0.252781] build_sched_domain: cpu: 1 level: DIE cpu_map: 0-3 tl->mask: 0-3
[    0.252866] build_sched_domain: cpu: 2 level: SMT cpu_map: 0-3 tl->mask: 0,2
[    0.252951] build_sched_domain: cpu: 2 level: MC cpu_map: 0-3 tl->mask: 0,2
[    0.253005] build_sched_domain: cpu: 2 level: DIE cpu_map: 0-3 tl->mask: 0-3
[    0.253091] build_sched_domain: cpu: 3 level: SMT cpu_map: 0-3 tl->mask: 1,3
[    0.253176] build_sched_domain: cpu: 3 level: MC cpu_map: 0-3 tl->mask: 1,3
[    0.253261] build_sched_domain: cpu: 3 level: DIE cpu_map: 0-3 tl->mask: 0-3
[    0.254004] build_sched_groups: got group f515b020 with cpus: 
[    0.254088] build_sched_groups: got group f515b120 with cpus: 
[    0.254170] build_sched_groups: got group f515b1a0 with cpus: 
[    0.254253] build_sched_groups: got group f515b2a0 with cpus: 
[    0.254336] build_sched_groups: got group f515b2e0 with cpus: 
[    0.254419] build_sched_groups: got group f515b0e0 with cpus: 
[    0.254502] build_sched_groups: got group f515b160 with cpus: 
[    0.254585] build_sched_groups: got group f515b1e0 with cpus: 
[    0.254680] CPU0 attaching sched-domain:
[    0.254684]  domain 0: span 0,2 level SMT
[    0.254687]   groups: 0 (cpu_capacity = 586) 2 (cpu_capacity = 588)
[    0.254695]   domain 1: span 0-3 level DIE
[    0.254698]    groups: 0,2 (cpu_capacity = 1174) 1,3 (cpu_capacity = 1176)
[    0.254709] CPU1 attaching sched-domain:
[    0.254711]  domain 0: span 1,3 level SMT
[    0.254714]   groups: 1 (cpu_capacity = 588) 3 (cpu_capacity = 588)
[    0.254721]   domain 1: span 0-3 level DIE
[    0.254724]    groups: 1,3 (cpu_capacity = 1176) 0,2 (cpu_capacity = 1174)
[    0.254733] CPU2 attaching sched-domain:
[    0.254735]  domain 0: span 0,2 level SMT
[    0.254738]   groups: 2 (cpu_capacity = 588) 0 (cpu_capacity = 586)
[    0.254745]   domain 1: span 0-3 level DIE
[    0.254747]    groups: 0,2 (cpu_capacity = 1174) 1,3 (cpu_capacity = 1176)
[    0.254756] CPU3 attaching sched-domain:
[    0.254758]  domain 0: span 1,3 level SMT
[    0.254761]   groups: 3 (cpu_capacity = 588) 1 (cpu_capacity = 588)
[    0.254768]   domain 1: span 0-3 level DIE
[    0.254770]    groups: 1,3 (cpu_capacity = 1176) 0,2 (cpu_capacity = 1174)
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