Messages in this thread Patch in this message | | | From | Valentin Schneider <> | Subject | [PATCH v5 11/17] sched/topology: Mark SD_PREFER_SIBLING as SDF_NEEDS_GROUPS | Date | Wed, 12 Aug 2020 13:52:54 +0100 |
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SD_PREFER_SIBLING is currently considered in sd_parent_degenerate() but not in sd_degenerate(). It too hinges on load balancing, and thus won't have any effect when set on a domain with a single group. Add it to SD_DEGENERATE_GROUPS_MASK.
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> --- include/linux/sched/sd_flags.h | 4 +++- kernel/sched/topology.c | 2 +- 2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/include/linux/sched/sd_flags.h b/include/linux/sched/sd_flags.h index 4f07b405564e..75c9749a6e2d 100644 --- a/include/linux/sched/sd_flags.h +++ b/include/linux/sched/sd_flags.h @@ -131,8 +131,10 @@ SD_FLAG(SD_ASYM_PACKING, SDF_SHARED_CHILD) * * Set up until domains start spanning NUMA nodes. Close to being a SHARED_CHILD * flag, but cleared below domains with SD_ASYM_CPUCAPACITY. + * + * NEEDS_GROUPS: Load balancing flag. */ -SD_FLAG(SD_PREFER_SIBLING, 0) +SD_FLAG(SD_PREFER_SIBLING, SDF_NEEDS_GROUPS) /* * sched_groups of this level overlap diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 02fd8db747b2..8064f495641b 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -184,7 +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_DEGENERATE_GROUPS_MASK | SD_PREFER_SIBLING); + pflags &= ~SD_DEGENERATE_GROUPS_MASK; if (~cflags & pflags) return 0; -- 2.27.0
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