[patch v5 12/15] sched: pull all tasks from source group

Alex Shi
2013-02-18T05:08:59Z

In power balance, we hope some sched groups are fully empty to save
CPU power of them. So, we want to move any tasks from them.

Signed-off-by: Alex Shi <alex.shi@intel.com>
---
kernel/sched/fair.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0047856..f3abb83 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5125,7 +5125,9 @@ static struct rq *find_busiest_queue(struct lb_env *env,
* When comparing with imbalance, use weighted_cpuload()
* which is not scaled with the cpu power.
*/
- if (capacity && rq->nr_running == 1 && wl > env->imbalance)
+ if (rq->nr_running == 0 ||
+ (!env->power_lb && capacity &&
+ rq->nr_running == 1 && wl > env->imbalance))
continue;

/*
@@ -5229,7 +5231,8 @@ redo:

ld_moved = 0;
lb_iterations = 1;
- if (busiest->nr_running > 1) {
+ if (busiest->nr_running > 1 ||
+ (busiest->nr_running == 1 && env.power_lb)) {
/*
* Attempt to move tasks. If find_busiest_group has found
* an imbalance but busiest->nr_running <= 1, the group is
--
1.7.12