[PATCH v4 5/6] sched: consider runnable load average in move_tasks

Alex Shi
2013-04-27T05:27:29Z

Except using runnable load average in background, move_tasks is also
the key functions in load balance. We need consider the runnable load
average in it in order to the apple to apple load comparison.

Signed-off-by: Alex Shi <alex.shi@intel.com>
---
kernel/sched/fair.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index ca63c9f..995dfc7 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3989,6 +3989,15 @@ static unsigned long task_h_load(struct task_struct *p);

static const unsigned int sched_nr_migrate_break = 32;

+static unsigned long task_h_load_avg(struct task_struct *p)
+{
+ u32 period = p->se.avg.runnable_avg_period;
+ if (!period)
+ return 0;
+
+ return task_h_load(p) * p->se.avg.runnable_avg_sum / period;
+}
+
/*
* move_tasks tries to move up to imbalance weighted load from busiest to
* this_rq, as part of a balancing operation within domain "sd".
@@ -4024,7 +4033,7 @@ static int move_tasks(struct lb_env *env)
if (!can_migrate_task(p, env))
goto next;

- load = task_h_load(p);
+ load = task_h_load_avg(p);

if (sched_feat(LB_MIN) && load < 16 && !env->sd->nr_balance_failed)
goto next;
--
1.7.12