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SubjectRe: Scheduler regression from caffcdd8d27ba78730d5540396ce72ad022aff2c
On Fri, Jul 18, 2014 at 12:16:33 +0200,
Peter Zijlstra <peterz@infradead.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
[ 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



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