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SubjectRe: [PATCH] sched/topology: Fix overlapping sched_group build
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On Wed, Mar 25 2020, Dietmar Eggemann wrote:
>> I somehow missed that this triggers the WARN_ON_ONCE() in
>> init_overlap_sched_group(). Gotta figure out why.
>
> Cool, seems like qemu can emulate this!
>
>
> qemu-system-aarch64 -kernel Image -hda ./qemu-image-aarch64.img -append
> 'root=/dev/vda console=ttyAMA0 loglevel=8 sched_debug' -smp cores=8
> --nographic -m 512 -cpu cortex-a53 -machine virt -numa
> node,cpus=0-1,nodeid=0 -numa node,cpus=2-3,nodeid=1, -numa
> node,cpus=4-5,nodeid=2, -numa node,cpus=6-7,nodeid=3, -numa
> dist,src=0,dst=1,val=12, -numa dist,src=0,dst=2,val=20, -numa
> dist,src=0,dst=3,val=22, -numa dist,src=1,dst=2,val=22, -numa
> dist,src=1,dst=3,val=24, -numa dist,src=2,dst=3,val=12
>
> ...
> [ 0.711685]
> [ 0.711767] 10 12 20 22
> [ 0.711860] 12 10 22 24
> [ 0.711917] 20 22 10 12
> [ 0.711970] 22 24 12 10
> [ 0.712036]
> [ 0.718356] CPU0 attaching sched-domain(s):
> [ 0.718433] domain-0: span=0-1 level=MC
> [ 0.718646] groups: 0:{ span=0 cap=1006 }, 1:{ span=1 cap=1015 }
> [ 0.718865] domain-1: span=0-3 level=NUMA
> [ 0.718906] groups: 0:{ span=0-1 cap=2021 }, 2:{ span=2-3 cap=2014 }
> [ 0.719044] domain-2: span=0-5 level=NUMA
> [ 0.719082] groups: 0:{ span=0-3 cap=4035 }, 4:{ span=4-7 cap=3855 }
> [ 0.719164] ERROR: groups don't span domain->span
> [ 0.719191] domain-3: span=0-7 level=NUMA
> [ 0.719228] groups: 0:{ span=0-5 mask=0-1 cap=5974 }, 6:{
> span=4-7 mask=6-7 cap=3964 }
> [ 0.719961] CPU1 attaching sched-domain(s):
> ...
>

I wasn't aware you could specify the distances directly on the CLI,
that's awesome! Thanks for pointing this out.

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