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sched/topology: Mark SD_SERIALIZE as SDF_NEEDS_GROUPS

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There would be no point in preserving a sched_domain with a single group
just because it has this flag set. Add it to SD_DEGENERATE_GROUPS_MASK.

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/20200817113003.20802-14-valentin.schneider@arm.com
This commit is contained in:
Valentin Schneider 2020-08-17 12:29:59 +01:00 committed by Ingo Molnar
parent 94b858fea1
commit bdb7c802cc
1 changed files with 5 additions and 4 deletions
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9
include/linux/sched/sd_flags.h
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@ -112,11 +112,12 @@ SD_FLAG(SD_SHARE_PKG_RESOURCES, SDF_SHARED_CHILD | SDF_NEEDS_GROUPS)
* Only a single load balancing instance
*
* SHARED_PARENT: Set for all NUMA levels above NODE. Could be set from a
* different level upwards, but it doesn't change that if a domain has this flag
* set, then all of its parents need to have it too (otherwise the serialization
* doesn't make sense).
* different level upwards, but it doesn't change that if a
* domain has this flag set, then all of its parents need to have
* it too (otherwise the serialization doesn't make sense).
* NEEDS_GROUPS: No point in preserving domain if it has a single group.
*/
SD_FLAG(SD_SERIALIZE, SDF_SHARED_PARENT)
SD_FLAG(SD_SERIALIZE, SDF_SHARED_PARENT | SDF_NEEDS_GROUPS)
/*
* Place busy tasks earlier in the domain