[patch v7 16/21] sched: no balance for prefer_sibling in power scheduling

[Alex Shi]

In power aware scheduling, we don't want to balance 'prefer_sibling'
groups just because local group has capacity.
If the local group has no tasks at the time, that is the power
balance hope so.

Signed-off-by: Alex Shi <alex.shi@xxxxxxxxx>
---
 kernel/sched/fair.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0dd29f4..86221e7 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4762,8 +4762,12 @@ static inline void update_sd_lb_stats(struct lb_env *env,
 		 * extra check prevents the case where you always pull from the
 		 * heaviest group when it is already under-utilized (possible
 		 * with a large weight task outweighs the tasks on the system).
+		 *
+		 * In power aware scheduling, we don't care load weight and
+		 * want not to pull tasks just because local group has capacity.
 		 */
-		if (prefer_sibling && !local_group && sds->this_has_capacity)
+		if (prefer_sibling && !local_group && sds->this_has_capacity
+				&& env->flags & LBF_PERF_BAL)
 			sgs.group_capacity = min(sgs.group_capacity, 1UL);
 
 		if (local_group) {
-- 
1.7.12

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/