[RFC v3 0/9] make performance is associated with vGPU type

[Zhenyu Wang]

On 2017.03.02 10:19:34 +0800, Ping Gao wrote:
> v3:	1. rename dummy vGPU to idle vGPU.
> 	2. introduce an enum for num_vgpu_sched.
> 	3. rename some structure and function.
> 	4. comments elaborating. 
> 	5. didnot add statitic interface as no per-vgpu interface exist.

Just have a quick review, I think there's some order issues, preceding patch
in series should not depend on later ones, e.g should first add weight
interface for vgpu, then add weight based timeslice scheduling function, etc.
We need each one to be bisect-able, so be careful on patch order.

And weight value setting for vgpu type needs to refresh on latest gvt-staging
change for fixed vgpu types.

> 
> v2:
>         1. use hrtimer to replace delay_work to trigger scheduler.
>         2. introduce dummy vGPU to help handle performance control.
>         3. introduce vGPU LRU list to handle longest unsched vGPU.
>         4. Test result(stability and precision) seems good.
> 
> v1:
> 	1. Currrently, scheduler is triggered by delay_work, it's only can be
> 	   accurate at 10ms level, so have to change the scheduler period to
> 	   10ms, it will have stability impact.
> 	2. Test two vGPU type 2 and type 5, the fps of tropic in two guest show 
>   	   about 5:2, it's workable but the precision is not good.
> 
> 	TODO: 1. Use htimer replace the delay_work to trigger scheduler.
> 	      2. Create dummy vGPU to help caculation.   
> 
> Ping Gao (9):
>   drm/i915/gvt: use hrtimer replace delayed_work in scheduler
>   drm/i915/gvt: create an idle vGPU
>   drm/i915/gvt: insert the idle vGPU into scheduler
>   drm/i915/gvt: add some statistic routine for scheduler
>   drm/i915/gvt: factor out the scheduler
>   drm/i915/gvt: introduce the vGPU LRU list
>   drm/i915/gvt: add basic function for weight control
>   drm/i915/gvt: control the scheduler by timeslice usage
>   drm/i915/gvt: define weight according to vGPU type
> 
>  drivers/gpu/drm/i915/gvt/gvt.c          |  17 ++
>  drivers/gpu/drm/i915/gvt/gvt.h          |  15 ++
>  drivers/gpu/drm/i915/gvt/handlers.c     |   1 +
>  drivers/gpu/drm/i915/gvt/kvmgt.c        |   4 +-
>  drivers/gpu/drm/i915/gvt/sched_policy.c | 356 +++++++++++++++++++++++++++-----
>  drivers/gpu/drm/i915/gvt/sched_policy.h |   2 +
>  drivers/gpu/drm/i915/gvt/vgpu.c         |  59 ++++++
>  7 files changed, 402 insertions(+), 52 deletions(-)
> 
> -- 
> 2.7.4
> 
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