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Subject[PATCH v10 5/7] sched: Remove task and group entity load when they are dead
Date
When task exits or group is destroyed, the entity's load should be
removed from its parent cfs_rq's load. Otherwise, it will take time
for the parent cfs_rq to decay the dead entity's load to 0, which
is not desired.

Signed-off-by: Yuyang Du <yuyang.du@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 edc404c..19f1199 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4919,6 +4919,11 @@ static void migrate_task_rq_fair(struct task_struct *p, int next_cpu)
/* We have migrated, no longer consider this task hot */
p->se.exec_start = 0;
}
+
+static void task_dead_fair(struct task_struct *p)
+{
+ remove_entity_load_avg(&p->se);
+}
#endif /* CONFIG_SMP */

static unsigned long
@@ -8027,8 +8032,11 @@ void free_fair_sched_group(struct task_group *tg)
for_each_possible_cpu(i) {
if (tg->cfs_rq)
kfree(tg->cfs_rq[i]);
- if (tg->se)
+ if (tg->se) {
+ if (tg->se[i])
+ remove_entity_load_avg(tg->se[i]);
kfree(tg->se[i]);
+ }
}

kfree(tg->cfs_rq);
@@ -8215,6 +8223,7 @@ const struct sched_class fair_sched_class = {
.rq_offline = rq_offline_fair,

.task_waking = task_waking_fair,
+ .task_dead = task_dead_fair,
#endif

.set_curr_task = set_curr_task_fair,
--
2.1.4


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