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authorValentin Schneider <valentin.schneider@arm.com>2020-08-17 14:29:55 +0300
committerIngo Molnar <mingo@kernel.org>2020-08-19 11:49:48 +0300
commitab65afb094c7b2e954e8d56ffbc7df843211c2c8 (patch)
tree65eacab77cc6814334f595ab9e9fce3e0ee19e26 /kernel/sched/topology.c
parent6f349818621dff364fc000909135d0065e9756c9 (diff)
downloadlinux-ab65afb094c7b2e954e8d56ffbc7df843211c2c8.tar.xz
sched/topology: Remove SD_SERIALIZE degeneration special case
If there is only a single NUMA node in the system, the only NUMA topology level that will be generated will be NODE (identity distance), which doesn't have SD_SERIALIZE. This means we don't need this special case in sd_parent_degenerate(), as having the NODE level "naturally" covers it. Thus, remove it. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: https://lore.kernel.org/r/20200817113003.20802-10-valentin.schneider@arm.com
Diffstat (limited to 'kernel/sched/topology.c')
-rw-r--r--kernel/sched/topology.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 38e6671c3bd7..c662c53736e2 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -183,11 +183,9 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
return 0;
/* Flags needing groups don't count if only 1 group in parent */
- if (parent->groups == parent->groups->next) {
+ if (parent->groups == parent->groups->next)
pflags &= ~(SD_DEGENERATE_GROUPS_MASK | SD_PREFER_SIBLING);
- if (nr_node_ids == 1)
- pflags &= ~SD_SERIALIZE;
- }
+
if (~cflags & pflags)
return 0;