From: Chunming Zhou Date: Thu, 13 Aug 2015 05:04:06 +0000 (+0800) Subject: drm/amdgpu: fix unnecessary wake up X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1c8f805af9af445a42b8dbda5f620752996cba44;p=linux-beck.git drm/amdgpu: fix unnecessary wake up decrease CPU extra overhead. Signed-off-by: Chunming Zhou Reviewed-by: Jammy Zhou Reviewed-by: Christian K?nig --- diff --git a/drivers/gpu/drm/amd/scheduler/gpu_scheduler.c b/drivers/gpu/drm/amd/scheduler/gpu_scheduler.c index 5017c71ba700..3d45ff29eaa8 100644 --- a/drivers/gpu/drm/amd/scheduler/gpu_scheduler.c +++ b/drivers/gpu/drm/amd/scheduler/gpu_scheduler.c @@ -158,7 +158,7 @@ exit: if (sched->current_entity && (sched->current_entity != tmp)) wake_entity = sched->current_entity; sched->current_entity = tmp; - if (wake_entity) + if (wake_entity && wake_entity->need_wakeup) wake_up(&wake_entity->wait_queue); return tmp; } @@ -195,6 +195,7 @@ int amd_sched_entity_init(struct amd_gpu_scheduler *sched, entity->fence_context = fence_context_alloc(1); snprintf(name, sizeof(name), "c_entity[%llu]", entity->fence_context); memcpy(entity->name, name, 20); + entity->need_wakeup = false; if(kfifo_alloc(&entity->job_queue, jobs * sizeof(void *), GFP_KERNEL)) @@ -257,7 +258,7 @@ int amd_sched_entity_fini(struct amd_gpu_scheduler *sched, if (!is_context_entity_initialized(sched, entity)) return 0; - + entity->need_wakeup = true; /** * The client will not queue more IBs during this fini, consume existing * queued IBs @@ -323,8 +324,9 @@ int amd_sched_push_job(struct amd_gpu_scheduler *sched, */ schedule(); } - - wake_up_interruptible(&sched->wait_queue); + /* first job wake up scheduler */ + if ((kfifo_len(&c_entity->job_queue) / sizeof(void *)) == 1) + wake_up_interruptible(&sched->wait_queue); return 0; } diff --git a/drivers/gpu/drm/amd/scheduler/gpu_scheduler.h b/drivers/gpu/drm/amd/scheduler/gpu_scheduler.h index 5e35018ad7b8..47823b4a71e0 100644 --- a/drivers/gpu/drm/amd/scheduler/gpu_scheduler.h +++ b/drivers/gpu/drm/amd/scheduler/gpu_scheduler.h @@ -54,6 +54,7 @@ struct amd_sched_entity { bool is_pending; uint64_t fence_context; char name[20]; + bool need_wakeup; }; /**