Re: [PATCH 05/12] drm/i915: Trim NEWCLIENT boosting

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Quoting Tvrtko Ursulin (2019-02-04 12:11:41)
> 
> On 04/02/2019 08:41, Chris Wilson wrote:
> > Limit the NEWCLIENT boost to only give its small priority boost to fresh
> > clients only that have no dependencies.
> 
> Needs some actual explaining/documenting on why we would want this.
> 
> > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> > ---
> >   drivers/gpu/drm/i915/i915_request.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
> > index 7968875d0bed..69bc549e95d8 100644
> > --- a/drivers/gpu/drm/i915/i915_request.c
> > +++ b/drivers/gpu/drm/i915/i915_request.c
> > @@ -979,7 +979,7 @@ void i915_request_add(struct i915_request *request)
> >                * Allow interactive/synchronous clients to jump ahead of
> >                * the bulk clients. (FQ_CODEL)
> >                */
> > -             if (!prev || i915_request_completed(prev))
> > +             if (list_empty(&request->sched.signalers_list))
> 
> Why are the !prev and completed checks gone? Seems in disagreement with 
> the commit message text - they wouldn't have to be new clients any more, 
> just have no dependencies.

What? signalers_list is a superset of !prev || i915_request_completed.
-Chris
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