Commit 34d292d5 authored by Felix Kuehling's avatar Felix Kuehling Committed by Alex Deucher
Browse files

drm/amdkfd: Asynchronously free events 



The synchronize_rcu call in destroy_events can take several ms, which
noticeably slows down applications destroying many events. Use kfree_rcu
to free the event structure asynchronously and eliminate the
synchronize_rcu call in the user thread.

Signed-off-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: default avatarPhilip Yang <Philip.Yang@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 634c67ee

drivers/gpu/drm/amd/amdkfd/kfd_events.c

+1 −2
Original line number Diff line number Diff line
@@ -262,8 +262,7 @@ static void destroy_event(struct kfd_process *p, struct kfd_event *ev) 
		p->signal_event_count--;



	idr_remove(&p->event_idr, ev->event_id);

	synchronize_rcu();

	kfree(ev);

	kfree_rcu(ev, rcu);

}



static void destroy_events(struct kfd_process *p)

drivers/gpu/drm/amd/amdkfd/kfd_events.h

+2 −0
Original line number Diff line number Diff line
@@ -70,6 +70,8 @@ struct kfd_event { 
		struct kfd_hsa_memory_exception_data memory_exception_data;

		struct kfd_hsa_hw_exception_data hw_exception_data;

	};



	struct rcu_head rcu; /* for asynchronous kfree_rcu */

};



#define KFD_EVENT_TIMEOUT_IMMEDIATE 0