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

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Message-ID: <a70dcda0-6723-38f6-efeb-e8edb16dab55@amd.com>
Date:   Tue, 25 Oct 2022 13:50:03 -0400
From:   Luben Tuikov <luben.tuikov@....com>
To:     Alex Deucher <alexdeucher@...il.com>,
        brolerliew <brolerliew@...il.com>
Cc:     Andrey Grodzovsky <andrey.grodzovsky@....com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/scheduler: set current_entity to next when remove
 from rq

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
>>