linux-kernel - Re: [PATCH] drm/scheduler: set current

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Date:   Thu, 27 Oct 2022 03:01:43 -0400
From:   Luben Tuikov <luben.tuikov@....com>
To:     Alex Deucher <alexdeucher@...il.com>,
        brolerliew <brolerliew@...il.com>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/scheduler: set current_entity to next when remove
 from rq

On 2022-10-25 13:50, Luben Tuikov wrote:
> Looking...
> 
> Regards,
> Luben
> 
> On 2022-10-25 09:35, Alex Deucher wrote:
>> + Luben
>>
>> On Tue, Oct 25, 2022 at 2:55 AM brolerliew <brolerliew@...il.com> wrote:
>>>
>>> When entity move from one rq to another, current_entity will be set to NULL
>>> if it is the moving entity. This make entities close to rq head got
>>> selected more frequently, especially when doing load balance between
>>> multiple drm_gpu_scheduler.
>>>
>>> Make current_entity to next when removing from rq.
>>>
>>> Signed-off-by: brolerliew <brolerliew@...il.com>
>>> ---
>>>  drivers/gpu/drm/scheduler/sched_main.c | 5 +++--
>>>  1 file changed, 3 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
>>> index 2fab218d7082..00b22cc50f08 100644
>>> --- a/drivers/gpu/drm/scheduler/sched_main.c
>>> +++ b/drivers/gpu/drm/scheduler/sched_main.c
>>> @@ -168,10 +168,11 @@ void drm_sched_rq_remove_entity(struct drm_sched_rq *rq,
>>>         spin_lock(&rq->lock);
>>>
>>>         atomic_dec(rq->sched->score);
>>> -       list_del_init(&entity->list);
>>>
>>>         if (rq->current_entity == entity)
>>> -               rq->current_entity = NULL;
>>> +               rq->current_entity = list_next_entry(entity, list);
>>> +
>>> +       list_del_init(&entity->list);
>>>
>>>         if (drm_sched_policy == DRM_SCHED_POLICY_FIFO)
>>>                 drm_sched_rq_remove_fifo_locked(entity);
>>> --
>>> 2.34.1
>>>
> 

Looks good. I'll pick it up into some other changes I've in tow, and repost
along with my changes, as they're somewhat related.

Regards,
Luben