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    SubjectRe: [PATCH v8 6/6] cpuset: Allow reporting of sched domain generation info
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    On 05/22/2018 09:53 AM, Juri Lelli wrote:
    > 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?

    For testing purpose the debug messages from generate_sched_domains() is
    more concise. The sched_debug message is too verbose from my point of
    view. So I think it is still useful.

    Cheers,
    Longman

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