Am 28.10.18 um 10:59 schrieb Nayan Deshmukh:
If the hardware queue for a scheduler is empty then we don't
need to the shift the entities from their current scheduler
as they are not getting scheduled because of some dependency.
v2: to calculate the least loaded scheduler we only use hw_rq_count
when the number of jobs in their run queue are same
I still don't think that the hw_rq_count is the right thing to use here.
It is only a very short living snapshot of the momentary load and
doesn't reflect what is going on the ring in general.
When the number of jobs is equal I would rather use the number of
entities a scheduler has already assigned.
Christian.
Signed-off-by: Nayan Deshmukh <nayan26deshm...@gmail.com>
---
drivers/gpu/drm/scheduler/sched_entity.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/scheduler/sched_entity.c
b/drivers/gpu/drm/scheduler/sched_entity.c
index 3e22a54a99c2..cfe48df6621d 100644
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -125,15 +125,21 @@ bool drm_sched_entity_is_ready(struct drm_sched_entity
*entity)
static struct drm_sched_rq *
drm_sched_entity_get_free_sched(struct drm_sched_entity *entity)
{
- struct drm_sched_rq *rq = NULL;
+ struct drm_sched_rq *rq = NULL, *curr_rq = NULL;
unsigned int min_jobs = UINT_MAX, num_jobs;
int i;
for (i = 0; i < entity->num_rq_list; ++i) {
- num_jobs = atomic_read(&entity->rq_list[i]->sched->num_jobs);
+ curr_rq = entity->rq_list[i];
+ num_jobs = atomic_read(&curr_rq->sched->num_jobs);
if (num_jobs < min_jobs) {
min_jobs = num_jobs;
- rq = entity->rq_list[i];
+ rq = curr_rq;
+ } else if (num_jobs == min_jobs) {
+ if (atomic_read(&curr_rq->sched->hw_rq_count) <
+ atomic_read(&rq->sched->hw_rq_count)) {
+ rq = curr_rq;
+ }
}
}
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