[PATCH v2] drm/i915/gvt: avoid unnecessary vgpu switch
Ping Gao
ping.a.gao at intel.com
Wed Apr 19 06:02:31 UTC 2017
It's no need to switch vgpu if next vgpu is the same with current
vgpu, otherwise it will make performance drop in some case.
v2: correct the comments.
Signed-off-by: Ping Gao <ping.a.gao at intel.com>
---
drivers/gpu/drm/i915/gvt/sched_policy.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/gvt/sched_policy.c b/drivers/gpu/drm/i915/gvt/sched_policy.c
index 79ba4b3..f25ff13 100644
--- a/drivers/gpu/drm/i915/gvt/sched_policy.c
+++ b/drivers/gpu/drm/i915/gvt/sched_policy.c
@@ -129,9 +129,13 @@ static void try_to_schedule_next_vgpu(struct intel_gvt *gvt)
struct vgpu_sched_data *vgpu_data;
ktime_t cur_time;
- /* no target to schedule */
- if (!scheduler->next_vgpu)
+ /* no need to schedule if next_vgpu is the same with current_vgpu,
+ * let scheduler chose next_vgpu again by setting it to NULL.
+ */
+ if (scheduler->next_vgpu == scheduler->current_vgpu) {
+ scheduler->next_vgpu = NULL;
return;
+ }
/*
* after the flag is set, workload dispatch thread will
--
1.9.1
More information about the intel-gvt-dev
mailing list