linux-kernel - Re: [PATCH 0/4] sched/topology: fix overlap group capacity and balance cpu

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Date:   Fri, 28 Apr 2017 12:33:41 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Lauro Venancio <lvenanci@...hat.com>
Cc:     lwang@...hat.com, riel@...hat.com, Mike Galbraith <efault@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] sched/topology: fix overlap group capacity and
 balance cpu

On Wed, Apr 26, 2017 at 02:59:09PM -0300, Lauro Venancio wrote:

> Maybe, to make the debug messages clear, you could print "balance_cpu:
> %d" instead of "capacity(%d): " and assert (sgc id == balance cpu). You
> would need to restart the sgc id count on every topology level.

Right, that's a good suggestion. I've also completely revamped printing
the groups, because they got really long and it was very hard to
visually separate the individual groups on a line.

I've ended up with the following:

  [] CPU0 attaching sched-domain(s):
  []  domain-0: span=0,4 level=DIE
  []   groups: 0:{ span=0 }, 4:{ span=4 }
  []   domain-1: span=0-1,3-5,7 level=NUMA
  []    groups: 0:{ span=0,4 mask=0,4 cap=2048 }, 1:{ span=1,5 mask=1,5 cap=2048 }, 3:{ span=3,7 mask=3,7 cap=2048 }
  []    domain-2: span=0-7 level=NUMA
  []     groups: 0:{ span=0-1,3-5,7 mask=0,4 cap=6144 }, 2:{ span=1-3,5-7 mask=2,6 cap=6144 }
  [] CPU1 attaching sched-domain(s):
  []  domain-0: span=1,5 level=DIE
  []   groups: 1:{ span=1 }, 5:{ span=5 }
  []   domain-1: span=0-2,4-6 level=NUMA
  []    groups: 1:{ span=1,5 mask=1,5 cap=2048 }, 2:{ span=2,6 mask=2,6 cap=2048 }, 4:{ span=0,4 mask=0,4 cap=2048 }
  []    domain-2: span=0-7 level=NUMA
  []     groups: 1:{ span=0-2,4-6 mask=1,5 cap=6144 }, 3:{ span=0,2-4,6-7 mask=3,7 cap=6144 }