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sched/topology: Propagate SMT flags when removing degenerate domain

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When a degenerate cluster domain for core with SMT CPUs is removed,
the SD_SHARE_CPUCAPACITY flag in the local child sched group was not
propagated to the new parent.  We need this flag to properly determine
whether the local sched group is SMT.  Set the flag in the local
child sched group of the new parent sched domain.

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Link: https://lkml.kernel.org/r/73cf0959eafa53c02e7ef6bf805d751d9190e55d.1683156492.git.tim.c.chen@linux.intel.com
This commit is contained in:
Tim C Chen 2023-05-04 09:09:51 -07:00 • committed by Peter Zijlstra
parent 519fabc7aa
commit bf2dc42d6b
1 changed files with 6 additions and 1 deletions
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7
kernel/sched/topology.c
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@ -719,8 +719,13 @@ cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu)
if (sd_parent_degenerate(tmp, parent)) {
tmp->parent = parent->parent;
if (parent->parent)
if (parent->parent) {
parent->parent->child = tmp;
if (tmp->flags & SD_SHARE_CPUCAPACITY)
parent->parent->groups->flags |= SD_SHARE_CPUCAPACITY;
}
/*
* Transfer SD_PREFER_SIBLING down in case of a
* degenerate parent; the spans match for this