[PATCH libdrm] amdgpu: add a faster BO list API

[Marek Olšák]

On Wed, Jan 16, 2019 at 9:43 AM Christian König <
ckoenig.leichtzumerken at gmail.com> wrote:

> Am 16.01.19 um 15:39 schrieb Marek Olšák:
>
>
>
> On Wed, Jan 16, 2019, 9:34 AM Koenig, Christian <Christian.Koenig at amd.com
> wrote:
>
>> Am 16.01.19 um 15:31 schrieb Marek Olšák:
>>
>>
>>
>> On Wed, Jan 16, 2019, 7:55 AM Christian König <
>> ckoenig.leichtzumerken at gmail.com wrote:
>>
>>> Well if you ask me we should have the following interface for
>>> negotiating memory management with the kernel:
>>>
>>> 1. We have per process BOs which can't be shared between processes.
>>>
>>> Those are always valid and don't need to be mentioned in any BO list
>>> whatsoever.
>>>
>>> If we knew that a per process BO is currently not in use we can
>>> optionally tell that to the kernel to make memory management more
>>> efficient.
>>>
>>> In other words instead of a list of stuff which is used we send down to
>>> the kernel a list of stuff which is not used any more and that only when
>>> we know that it is necessary, e.g. when a game or application
>>> overcommits.
>>>
>>
>> Radeonsi doesn't use this because this approach caused performance
>> degradation and also drops BO priorities.
>>
>>
>> The performance degradation where mostly shortcomings with the LRU which
>> by now have been fixed.
>>
>> BO priorities are a different topic, but could be added to per VM BOs as
>> well.
>>
>
> What's the minimum drm version that contains the fixes?
>
>
> I've pushed the last optimization this morning. No idea when it really
> became useful, but the numbers from the closed source clients now look much
> better.
>
> We should probably test and bump the drm version when we are sure that
> this now works as expected.
>

We should, but AMD Mesa guys don't have any time.

Marek
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