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Subject[PATCH 2/2] sched/fair: Update task group's load_avg after task migrate
Date
When cfs_rq has removed_load_avg (when task migrates from this cfs_rq),
we need to update its contribution to the group's load_avg. This should
not increase tg's update too much, because in most of the cases, the
cfs_rq has already decayed load_avg.

Signed-off-by: Yuyang Du <yuyang.du@intel.com>
---
kernel/sched/fair.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 601a253..824aa9f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2686,12 +2686,13 @@ static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq);
static inline int update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
{
struct sched_avg *sa = &cfs_rq->avg;
- int decayed;
+ int decayed, removed = 0;

if (atomic_long_read(&cfs_rq->removed_load_avg)) {
long r = atomic_long_xchg(&cfs_rq->removed_load_avg, 0);
sa->load_avg = max_t(long, sa->load_avg - r, 0);
sa->load_sum = max_t(s64, sa->load_sum - r * LOAD_AVG_MAX, 0);
+ removed = 1;
}

if (atomic_long_read(&cfs_rq->removed_util_avg)) {
@@ -2708,7 +2709,7 @@ static inline int update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
cfs_rq->load_last_update_time_copy = sa->last_update_time;
#endif

- return decayed;
+ return decayed || removed;
}

/* Update task and its cfs_rq load average */
--
2.1.4


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