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drm/i915/gvt: avoid unnecessary vgpu switch 

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@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Ping Gao 2017-04-19 14:02:31 +08:00 committed by Zhenyu Wang
parent 2345ab1df8
commit ae157902ae
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/i915/gvt/sched_policy.c
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@ -53,9 +53,13 @@ static void try_to_schedule_next_vgpu(struct intel_gvt *gvt)
enum intel_engine_id i;
struct intel_engine_cs *engine;
/* 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;
}
gvt_dbg_sched("try to schedule next vgpu %d\n",
scheduler->next_vgpu->id);