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sched/topology: Use prebuilt SD flag degeneration mask 

Leverage SD_DEGENERATE_GROUPS_MASK in sd_degenerate() and
sd_parent_degenerate().

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: https://lore.kernel.org/r/20200817113003.20802-9-valentin.schneider@arm.com
This commit is contained in:
Valentin Schneider 2020-08-17 12:29:54 +01:00 committed by Ingo Molnar
parent 4ee4ea443a
commit 6f34981862
1 changed files with 4 additions and 16 deletions
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20
kernel/sched/topology.c
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@ -160,15 +160,9 @@ static int sd_degenerate(struct sched_domain *sd)
return 1;
/* Following flags need at least 2 groups */
if (sd->flags & (SD_BALANCE_NEWIDLE |
SD_BALANCE_FORK |
SD_BALANCE_EXEC |
SD_SHARE_CPUCAPACITY |
SD_ASYM_CPUCAPACITY |
SD_SHARE_PKG_RESOURCES)) {
if (sd->groups != sd->groups->next)
return 0;
}
if ((sd->flags & SD_DEGENERATE_GROUPS_MASK) &&
(sd->groups != sd->groups->next))
return 0;
/* Following flags don't use groups */
if (sd->flags & (SD_WAKE_AFFINE))
@ -190,13 +184,7 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
/* Flags needing groups don't count if only 1 group in parent */
if (parent->groups == parent->groups->next) {
pflags &= ~(SD_BALANCE_NEWIDLE |
SD_BALANCE_FORK |
SD_BALANCE_EXEC |
SD_ASYM_CPUCAPACITY |
SD_SHARE_CPUCAPACITY |
SD_SHARE_PKG_RESOURCES |
SD_PREFER_SIBLING);
pflags &= ~(SD_DEGENERATE_GROUPS_MASK | SD_PREFER_SIBLING);
if (nr_node_ids == 1)
pflags &= ~SD_SERIALIZE;
}