Messages in this thread Patch in this message | | | From | Yuyang Du <> | Subject | [PATCH v8 4/4] sched: Remove task and group entity load when they are dead | Date | Tue, 16 Jun 2015 03:26:07 +0800 |
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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 08ab789..a8fd7b9 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4904,6 +4904,11 @@ 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 @@ -7998,8 +8003,11 @@ 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); @@ -8186,6 +8194,7 @@ 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, -- 1.7.9.5
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