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sched/topology: Align group flags when removing degenerate domain

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The flags of the child of a given scheduling domain are used to initialize
the flags of its scheduling groups. When the child of a scheduling domain
is degenerated, the flags of its local scheduling group need to be updated
to align with the flags of its new child domain.

The flag SD_SHARE_CPUCAPACITY was aligned in
Commit bf2dc42d6b ("sched/topology: Propagate SMT flags when removing degenerate domain").
Further generalize this alignment so other flags can be used later, such as
in cluster-based task wakeup. [1]

Reported-by: Yicong Yang <yangyicong@huawei.com>
Suggested-by: Ricardo Neri <ricardo.neri@intel.com>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Tim Chen <tim.c.chen@linux.intel.com>
Reviewed-by: Yicong Yang <yangyicong@hisilicon.com>
Link: https://lore.kernel.org/r/20230713013133.2314153-1-yu.c.chen@intel.com
This commit is contained in:
Chen Yu 2023-07-13 09:31:33 +08:00 • committed by Peter Zijlstra
parent c2e164ac33
commit 4efcc8bc7e
1 changed files with 1 additions and 2 deletions
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3
kernel/sched/topology.c
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@ -722,8 +722,7 @@ cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu)
if (parent->parent) {
parent->parent->child = tmp;
if (tmp->flags & SD_SHARE_CPUCAPACITY)
parent->parent->groups->flags |= SD_SHARE_CPUCAPACITY;
parent->parent->groups->flags = tmp->flags;
}
/*