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Subject[RFC patch v2 6/7] sched: consider runnable load average in move_tasks
Date
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 729221b..84bb3f7 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3978,6 +3978,15 @@ 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".
@@ -4013,7 +4022,7 @@ static int move_tasks(struct lb_env *env)
if (throttled_lb_pair(task_group(p), env->src_cpu, env->dst_cpu))
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


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