[PATCH v2] drm/sched: Further optimise drm_sched_entity_push_job
Philipp Stanner
pstanner at redhat.com
Thu Sep 26 08:18:06 UTC 2024
On Tue, 2024-09-24 at 14:02 +0200, Christian König wrote:
> Am 24.09.24 um 11:58 schrieb Tvrtko Ursulin:
> >
> > On 24/09/2024 10:45, Tvrtko Ursulin wrote:
> > >
> > > On 24/09/2024 09:20, Christian König wrote:
> > > > Am 16.09.24 um 19:30 schrieb Tvrtko Ursulin:
> > > > > From: Tvrtko Ursulin <tvrtko.ursulin at igalia.com>
> > > > >
> > > > > Having removed one re-lock cycle on the entity->lock in a
> > > > > patch titled
> > > > > "drm/sched: Optimise drm_sched_entity_push_job", with only a
> > > > > tiny bit
> > > > > larger refactoring we can do the same optimisation on the rq-
> > > > > >lock.
> > > > > (Currently both drm_sched_rq_add_entity() and
> > > > > drm_sched_rq_update_fifo_locked() take and release the same
> > > > > lock.)
> > > > >
> > > > > To achieve this we make drm_sched_rq_update_fifo_locked() and
> > > > > drm_sched_rq_add_entity() expect the rq->lock to be held.
> > > > >
> > > > > We also align drm_sched_rq_update_fifo_locked(),
> > > > > drm_sched_rq_add_entity() and
> > > > > drm_sched_rq_remove_fifo_locked() function signatures, by
> > > > > adding rq
> > > > > as a
> > > > > parameter to the latter.
> > > > >
> > > > > v2:
> > > > > * Fix after rebase of the series.
> > > > > * Avoid naming incosistency between
> > > > > drm_sched_rq_add/remove.
> > > > > (Christian)
> > > > >
> > > > > Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at igalia.com>
> > > > > Cc: Christian König <christian.koenig at amd.com>
> > > > > Cc: Alex Deucher <alexander.deucher at amd.com>
> > > > > Cc: Luben Tuikov <ltuikov89 at gmail.com>
> > > > > Cc: Matthew Brost <matthew.brost at intel.com>
> > > > > Cc: Philipp Stanner <pstanner at redhat.com>
> > > >
> > > > Reviewed-by: Christian König <christian.koenig at amd.com>
> > >
> > > Thanks!
> > >
> > > Are you okay to pull into drm-misc-next or we should do some more
> > > testing on this?
> > >
> > > And/or should I resend the series once more in it's entirety so
> > > this
> > > v2 is not a reply-to to the original?
> >
> > I have to respin for the drm_sched_wakeup fix that landed.
>
> When I should push the series to drm-misc-next then please send it to
> me
> once more.
>
> On the other hand we should now have to maintainers for that.
Yup, will pick up this responsibilities soonish. Danilo and I have been
on conference recently and I'm out of office soon for a bit, but you
can expect me / us to take over that work soonish in early autumn.
Regards,
P.
>
> Regards,
> Christian.
>
> >
> > Regards,
> >
> > Tvrtko
> >
> > >
> > > Regards,
> > >
> > > Tvrtko
> > >
> > > >
> > > > > ---
> > > > > drivers/gpu/drm/scheduler/sched_entity.c | 12 ++++++++--
> > > > > drivers/gpu/drm/scheduler/sched_main.c | 29
> > > > > ++++++++++++------------
> > > > > include/drm/gpu_scheduler.h | 3 ++-
> > > > > 3 files changed, 26 insertions(+), 18 deletions(-)
> > > > >
> > > > > diff --git a/drivers/gpu/drm/scheduler/sched_entity.c
> > > > > b/drivers/gpu/drm/scheduler/sched_entity.c
> > > > > index d982cebc6bee..8ace1f1ea66b 100644
> > > > > --- a/drivers/gpu/drm/scheduler/sched_entity.c
> > > > > +++ b/drivers/gpu/drm/scheduler/sched_entity.c
> > > > > @@ -515,9 +515,14 @@ struct drm_sched_job
> > > > > *drm_sched_entity_pop_job(struct drm_sched_entity *entity)
> > > > > next =
> > > > > to_drm_sched_job(spsc_queue_peek(&entity->job_queue));
> > > > > if (next) {
> > > > > + struct drm_sched_rq *rq;
> > > > > +
> > > > > spin_lock(&entity->lock);
> > > > > - drm_sched_rq_update_fifo_locked(entity,
> > > > > + rq = entity->rq;
> > > > > + spin_lock(&rq->lock);
> > > > > + drm_sched_rq_update_fifo_locked(entity, rq,
> > > > > next->submit_ts);
> > > > > + spin_unlock(&rq->lock);
> > > > > spin_unlock(&entity->lock);
> > > > > }
> > > > > }
> > > > > @@ -618,11 +623,14 @@ void drm_sched_entity_push_job(struct
> > > > > drm_sched_job *sched_job)
> > > > > sched = rq->sched;
> > > > > atomic_inc(sched->score);
> > > > > +
> > > > > + spin_lock(&rq->lock);
> > > > > drm_sched_rq_add_entity(rq, entity);
> > > > > if (drm_sched_policy == DRM_SCHED_POLICY_FIFO)
> > > > > - drm_sched_rq_update_fifo_locked(entity,
> > > > > submit_ts);
> > > > > + drm_sched_rq_update_fifo_locked(entity, rq,
> > > > > submit_ts);
> > > > > + spin_unlock(&rq->lock);
> > > > > spin_unlock(&entity->lock);
> > > > > drm_sched_wakeup(sched, entity);
> > > > > diff --git a/drivers/gpu/drm/scheduler/sched_main.c
> > > > > b/drivers/gpu/drm/scheduler/sched_main.c
> > > > > index 18a952f73ecb..5c83fb92bb89 100644
> > > > > --- a/drivers/gpu/drm/scheduler/sched_main.c
> > > > > +++ b/drivers/gpu/drm/scheduler/sched_main.c
> > > > > @@ -153,17 +153,18 @@ static __always_inline bool
> > > > > drm_sched_entity_compare_before(struct rb_node *a,
> > > > > return ktime_before(ent_a->oldest_job_waiting,
> > > > > ent_b->oldest_job_waiting);
> > > > > }
> > > > > -static inline void drm_sched_rq_remove_fifo_locked(struct
> > > > > drm_sched_entity *entity)
> > > > > +static void drm_sched_rq_remove_fifo_locked(struct
> > > > > drm_sched_entity *entity,
> > > > > + struct drm_sched_rq *rq)
> > > > > {
> > > > > - struct drm_sched_rq *rq = entity->rq;
> > > > > -
> > > > > if (!RB_EMPTY_NODE(&entity->rb_tree_node)) {
> > > > > rb_erase_cached(&entity->rb_tree_node, &rq-
> > > > > >rb_tree_root);
> > > > > RB_CLEAR_NODE(&entity->rb_tree_node);
> > > > > }
> > > > > }
> > > > > -void drm_sched_rq_update_fifo_locked(struct drm_sched_entity
> > > > > *entity, ktime_t ts)
> > > > > +void drm_sched_rq_update_fifo_locked(struct drm_sched_entity
> > > > > *entity,
> > > > > + struct drm_sched_rq *rq,
> > > > > + ktime_t ts)
> > > > > {
> > > > > /*
> > > > > * Both locks need to be grabbed, one to protect from
> > > > > entity->rq change
> > > > > @@ -171,17 +172,14 @@ void
> > > > > drm_sched_rq_update_fifo_locked(struct
> > > > > drm_sched_entity *entity, ktime_t ts
> > > > > * other to update the rb tree structure.
> > > > > */
> > > > > lockdep_assert_held(&entity->lock);
> > > > > + lockdep_assert_held(&rq->lock);
> > > > > - spin_lock(&entity->rq->lock);
> > > > > -
> > > > > - drm_sched_rq_remove_fifo_locked(entity);
> > > > > + drm_sched_rq_remove_fifo_locked(entity, rq);
> > > > > entity->oldest_job_waiting = ts;
> > > > > - rb_add_cached(&entity->rb_tree_node, &entity->rq-
> > > > > >rb_tree_root,
> > > > > + rb_add_cached(&entity->rb_tree_node, &rq->rb_tree_root,
> > > > > drm_sched_entity_compare_before);
> > > > > -
> > > > > - spin_unlock(&entity->rq->lock);
> > > > > }
> > > > > /**
> > > > > @@ -213,15 +211,14 @@ static void drm_sched_rq_init(struct
> > > > > drm_gpu_scheduler *sched,
> > > > > void drm_sched_rq_add_entity(struct drm_sched_rq *rq,
> > > > > struct drm_sched_entity *entity)
> > > > > {
> > > > > + lockdep_assert_held(&entity->lock);
> > > > > + lockdep_assert_held(&rq->lock);
> > > > > +
> > > > > if (!list_empty(&entity->list))
> > > > > return;
> > > > > - spin_lock(&rq->lock);
> > > > > -
> > > > > atomic_inc(rq->sched->score);
> > > > > list_add_tail(&entity->list, &rq->entities);
> > > > > -
> > > > > - spin_unlock(&rq->lock);
> > > > > }
> > > > > /**
> > > > > @@ -235,6 +232,8 @@ void drm_sched_rq_add_entity(struct
> > > > > drm_sched_rq *rq,
> > > > > void drm_sched_rq_remove_entity(struct drm_sched_rq *rq,
> > > > > struct drm_sched_entity *entity)
> > > > > {
> > > > > + lockdep_assert_held(&entity->lock);
> > > > > +
> > > > > if (list_empty(&entity->list))
> > > > > return;
> > > > > @@ -247,7 +246,7 @@ void drm_sched_rq_remove_entity(struct
> > > > > drm_sched_rq *rq,
> > > > > rq->current_entity = NULL;
> > > > > if (drm_sched_policy == DRM_SCHED_POLICY_FIFO)
> > > > > - drm_sched_rq_remove_fifo_locked(entity);
> > > > > + drm_sched_rq_remove_fifo_locked(entity, rq);
> > > > > spin_unlock(&rq->lock);
> > > > > }
> > > > > diff --git a/include/drm/gpu_scheduler.h
> > > > > b/include/drm/gpu_scheduler.h
> > > > > index 80198e6cf537..b21806d5a8eb 100644
> > > > > --- a/include/drm/gpu_scheduler.h
> > > > > +++ b/include/drm/gpu_scheduler.h
> > > > > @@ -596,7 +596,8 @@ void drm_sched_rq_add_entity(struct
> > > > > drm_sched_rq *rq,
> > > > > void drm_sched_rq_remove_entity(struct drm_sched_rq *rq,
> > > > > struct drm_sched_entity *entity);
> > > > > -void drm_sched_rq_update_fifo_locked(struct drm_sched_entity
> > > > > *entity, ktime_t ts);
> > > > > +void drm_sched_rq_update_fifo_locked(struct drm_sched_entity
> > > > > *entity,
> > > > > + struct drm_sched_rq *rq, ktime_t ts);
> > > > > int drm_sched_entity_init(struct drm_sched_entity *entity,
> > > > > enum drm_sched_priority priority,
> > > >
>
More information about the amd-gfx
mailing list