[PATCH] drm/i915/gvt: avoid unnecessary vgpu switch
Ping Gao
ping.a.gao at intel.com
Mon Apr 17 05:43:53 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.
Signed-off-by: Ping Gao <ping.a.gao at intel.com>
---
drivers/gpu/drm/i915/gvt/sched_policy.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gvt/sched_policy.c b/drivers/gpu/drm/i915/gvt/sched_policy.c
index 79ba4b3..450a7ca 100644
--- a/drivers/gpu/drm/i915/gvt/sched_policy.c
+++ b/drivers/gpu/drm/i915/gvt/sched_policy.c
@@ -130,8 +130,10 @@ static void try_to_schedule_next_vgpu(struct intel_gvt *gvt)
ktime_t cur_time;
/* no target to schedule */
- if (!scheduler->next_vgpu)
+ if (scheduler->next_vgpu == scheduler->current_vgpu) {
+ scheduler->next_vgpu = NULL;
return;
+ }
/*
* after the flag is set, workload dispatch thread will
--
1.9.1
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