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SubjectRe: [PATCH v8 6/6] cpuset: Allow reporting of sched domain generation info
Hi,

On 17/05/18 16:55, Waiman Long wrote:
> This patch enables us to report sched domain generation information.
>
> If DYNAMIC_DEBUG is enabled, issuing the following command
>
> echo "file cpuset.c +p" > /sys/kernel/debug/dynamic_debug/control
>
> and setting loglevel to 8 will allow the kernel to show what scheduling
> domain changes are being made.
>
> Signed-off-by: Waiman Long <longman@redhat.com>
> ---
> kernel/cgroup/cpuset.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
> index fb8aa82b..8f586e8 100644
> --- a/kernel/cgroup/cpuset.c
> +++ b/kernel/cgroup/cpuset.c
> @@ -820,6 +820,12 @@ static int generate_sched_domains(cpumask_var_t **domains,
> }
> BUG_ON(nslot != ndoms);
>
> +#ifdef CONFIG_DEBUG_KERNEL
> + for (i = 0; i < ndoms; i++)
> + pr_debug("generate_sched_domains dom %d: %*pbl\n", i,
> + cpumask_pr_args(doms[i]));
> +#endif
> +

While I'm always in favor of adding debug output, in this case I'm not
sure it's adding much to what we already print when booting with
sched_debug kernel command-line param, e.g.

--->8---
Kernel command line: BOOT_IMAGE=/vmlinuz-4.17.0-rc5+ ... sched_debug

[...]

smp: Bringing up secondary CPUs ...
x86: Booting SMP configuration:
.... node #0, CPUs: #1 #2 #3 #4 #5
.... node #1, CPUs: #6 #7 #8 #9 #10 #11
smp: Brought up 2 nodes, 12 CPUs
smpboot: Max logical packages: 2
smpboot: Total of 12 processors activated (45636.50 BogoMIPS)
CPU0 attaching sched-domain(s):
domain-0: span=0-5 level=MC
groups: 0:{ span=0 cap=1016 }, 1:{ span=1 cap=1011 }, 2:{ span=2 }, 3:{ span=3 cap=1023 }, 4:{ span=4 }, 5:{ span=5 }
domain-1: span=0-11 level=NUMA
groups: 0:{ span=0-5 cap=6122 }, 6:{ span=6-11 cap=6141 }
CPU1 attaching sched-domain(s):
domain-0: span=0-5 level=MC
groups: 1:{ span=1 cap=1011 }, 2:{ span=2 }, 3:{ span=3 cap=1023 }, 4:{ span=4 }, 5:{ span=5 }, 0:{ span=0 cap=1016 }
domain-1: span=0-11 level=NUMA
groups: 0:{ span=0-5 cap=6122 }, 6:{ span=6-11 cap=6141 }
CPU2 attaching sched-domain(s):
domain-0: span=0-5 level=MC
groups: 2:{ span=2 }, 3:{ span=3 cap=1023 }, 4:{ span=4 }, 5:{ span=5 }, 0:{ span=0 cap=1016 }, 1:{ span=1 cap=1011 }
domain-1: span=0-11 level=NUMA
groups: 0:{ span=0-5 cap=6122 }, 6:{ span=6-11 cap=6141 }
CPU3 attaching sched-domain(s):
domain-0: span=0-5 level=MC
groups: 3:{ span=3 cap=1023 }, 4:{ span=4 }, 5:{ span=5 }, 0:{ span=0 cap=1016 }, 1:{ span=1 cap=1011 }, 2:{ span=2 }
domain-1: span=0-11 level=NUMA
groups: 0:{ span=0-5 cap=6122 }, 6:{ span=6-11 cap=6141 }
CPU4 attaching sched-domain(s):
domain-0: span=0-5 level=MC
groups: 4:{ span=4 }, 5:{ span=5 }, 0:{ span=0 cap=1016 }, 1:{ span=1 cap=1011 }, 2:{ span=2 }, 3:{ span=3 cap=1023 }
domain-1: span=0-11 level=NUMA
groups: 0:{ span=0-5 cap=6122 }, 6:{ span=6-11 cap=6141 }
CPU5 attaching sched-domain(s):
domain-0: span=0-5 level=MC
groups: 5:{ span=5 }, 0:{ span=0 cap=1016 }, 1:{ span=1 cap=1011 }, 2:{ span=2 }, 3:{ span=3 cap=1023 }, 4:{ span=4 }
domain-1: span=0-11 level=NUMA
groups: 0:{ span=0-5 cap=6122 }, 6:{ span=6-11 cap=6141 }
CPU6 attaching sched-domain(s):
domain-0: span=6-11 level=MC
groups: 6:{ span=6 }, 7:{ span=7 }, 8:{ span=8 cap=1021 }, 9:{ span=9 }, 10:{ span=10 }, 11:{ span=11 }
domain-1: span=0-11 level=NUMA
groups: 6:{ span=6-11 cap=6141 }, 0:{ span=0-5 cap=6122 }
CPU7 attaching sched-domain(s):
domain-0: span=6-11 level=MC
groups: 7:{ span=7 }, 8:{ span=8 cap=1021 }, 9:{ span=9 }, 10:{ span=10 }, 11:{ span=11 }, 6:{ span=6 }
domain-1: span=0-11 level=NUMA
groups: 6:{ span=6-11 cap=6141 }, 0:{ span=0-5 cap=6122 }
CPU8 attaching sched-domain(s):
domain-0: span=6-11 level=MC
groups: 8:{ span=8 cap=1021 }, 9:{ span=9 }, 10:{ span=10 }, 11:{ span=11 }, 6:{ span=6 }, 7:{ span=7 }
domain-1: span=0-11 level=NUMA
groups: 6:{ span=6-11 cap=6141 }, 0:{ span=0-5 cap=6122 }
CPU9 attaching sched-domain(s):
domain-0: span=6-11 level=MC
groups: 9:{ span=9 }, 10:{ span=10 }, 11:{ span=11 }, 6:{ span=6 }, 7:{ span=7 }, 8:{ span=8 cap=1021 }
domain-1: span=0-11 level=NUMA
groups: 6:{ span=6-11 cap=6141 }, 0:{ span=0-5 cap=6122 }
CPU10 attaching sched-domain(s):
domain-0: span=6-11 level=MC
groups: 10:{ span=10 }, 11:{ span=11 }, 6:{ span=6 }, 7:{ span=7 }, 8:{ span=8 cap=1021 }, 9:{ span=9 }
domain-1: span=0-11 level=NUMA
groups: 6:{ span=6-11 cap=6141 }, 0:{ span=0-5 cap=6122 }
CPU11 attaching sched-domain(s):
domain-0: span=6-11 level=MC
groups: 11:{ span=11 }, 6:{ span=6 }, 7:{ span=7 }, 8:{ span=8 cap=1021 }, 9:{ span=9 }, 10:{ span=10 }
domain-1: span=0-11 level=NUMA
groups: 6:{ span=6-11 cap=6141 }, 0:{ span=0-5 cap=6122 }
span: 0-11 (max cpu_capacity = 1024)

[...]

generate_sched_domains dom 0: 6-11 <-- this and the one below is what
generate_sched_domains dom 1: 0-5 you are adding
CPU0 attaching NULL sched-domain.
CPU1 attaching NULL sched-domain.
CPU2 attaching NULL sched-domain.
CPU3 attaching NULL sched-domain.
CPU4 attaching NULL sched-domain.
CPU5 attaching NULL sched-domain.
CPU6 attaching NULL sched-domain.
CPU7 attaching NULL sched-domain.
CPU8 attaching NULL sched-domain.
CPU9 attaching NULL sched-domain.
CPU10 attaching NULL sched-domain.
CPU11 attaching NULL sched-domain.
CPU6 attaching sched-domain(s):
domain-0: span=6-11 level=MC
groups: 6:{ span=6 }, 7:{ span=7 }, 8:{ span=8 }, 9:{ span=9 }, 10:{ span=10 }, 11:{ span=11 }
CPU7 attaching sched-domain(s):
domain-0: span=6-11 level=MC
groups: 7:{ span=7 }, 8:{ span=8 }, 9:{ span=9 }, 10:{ span=10 }, 11:{ span=11 }, 6:{ span=6 }
CPU8 attaching sched-domain(s):
domain-0: span=6-11 level=MC
groups: 8:{ span=8 }, 9:{ span=9 }, 10:{ span=10 }, 11:{ span=11 }, 6:{ span=6 }, 7:{ span=7 }
CPU9 attaching sched-domain(s):
domain-0: span=6-11 level=MC
groups: 9:{ span=9 }, 10:{ span=10 }, 11:{ span=11 }, 6:{ span=6 }, 7:{ span=7 }, 8:{ span=8 }
CPU10 attaching sched-domain(s):
domain-0: span=6-11 level=MC
groups: 10:{ span=10 }, 11:{ span=11 }, 6:{ span=6 }, 7:{ span=7 }, 8:{ span=8 }, 9:{ span=9 }
CPU11 attaching sched-domain(s):
domain-0: span=6-11 level=MC
groups: 11:{ span=11 }, 6:{ span=6 }, 7:{ span=7 }, 8:{ span=8 }, 9:{ span=9 }, 10:{ span=10 }
span: 6-11 (max cpu_capacity = 1024)
CPU0 attaching sched-domain(s):
domain-0: span=0-5 level=MC
groups: 0:{ span=0 }, 1:{ span=1 }, 2:{ span=2 }, 3:{ span=3 }, 4:{ span=4 }, 5:{ span=5 }
CPU1 attaching sched-domain(s):
domain-0: span=0-5 level=MC
groups: 1:{ span=1 }, 2:{ span=2 }, 3:{ span=3 }, 4:{ span=4 }, 5:{ span=5 }, 0:{ span=0 }
CPU2 attaching sched-domain(s):
domain-0: span=0-5 level=MC
groups: 2:{ span=2 }, 3:{ span=3 }, 4:{ span=4 }, 5:{ span=5 }, 0:{ span=0 }, 1:{ span=1 }
CPU3 attaching sched-domain(s):
domain-0: span=0-5 level=MC
groups: 3:{ span=3 }, 4:{ span=4 }, 5:{ span=5 }, 0:{ span=0 }, 1:{ span=1 }, 2:{ span=2 }
CPU4 attaching sched-domain(s):
domain-0: span=0-5 level=MC
groups: 4:{ span=4 }, 5:{ span=5 }, 0:{ span=0 }, 1:{ span=1 }, 2:{ span=2 }, 3:{ span=3 }
CPU5 attaching sched-domain(s):
domain-0: span=0-5 level=MC
groups: 5:{ span=5 }, 0:{ span=0 }, 1:{ span=1 }, 2:{ span=2 }, 3:{ span=3 }, 4:{ span=4 }
span: 0-5 (max cpu_capacity = 1024)
--->8---

Do you think there is still a benefit in printing out what
generate_sched_domains does?

Best,

- Juri

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