[PATCH v2] drm/i915/gvt: avoid unnecessary vgpu switch

[Zhenyu Wang]

On 2017.04.19 14:02:31 +0800, Ping Gao wrote:
> 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
> -- 

applied, thanks!

-- 
Open Source Technology Center, Intel ltd.

$gpg --keyserver wwwkeys.pgp.net --recv-keys 4D781827
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 195 bytes
Desc: not available
URL: <https://lists.freedesktop.org/archives/intel-gvt-dev/attachments/20170420/3ff1f225/attachment.sig>