Random short freezes due to TTM buffer migrations

[Marek Olšák]

On Wed, Aug 24, 2016 at 9:56 AM, Christian König
<deathsimple at vodafone.de> wrote:
> Am 23.08.2016 um 21:55 schrieb Marek Olšák:
>>
>> On Tue, Aug 23, 2016 at 8:01 PM, Marek Olšák <maraeo at gmail.com> wrote:
>>>
>>> On Thu, Aug 18, 2016 at 10:52 AM, Christian König
>>> <deathsimple at vodafone.de> wrote:
>>>>
>>>> In that case my patch should clearly help with that.
>>>>
>>>> Going to release what I have so far today, but looks like I need more
>>>> time
>>>> actually fixing this.
>>>>
>>>> In the meantime you could try the "drm/amdgpu: fix lru size grouping"
>>>> patch
>>>> as well. It fixes a bug related to this and could help as well.
>>>
>>> Thanks. "drm/amdgpu: fix lru size grouping" does help a lot and
>>> removes most of the long stalls.
>>>
>>> There are still some spikes in the number of moved bytes, but rarely
>>> do they cause long stalls and the number of moved bytes is lower now
>>> (e.g.
>>> the spikes are at 512MB/s instead of 4GB/s).
>>
>> Shouldn't "drm/amdgpu: fix lru size grouping" be a candidate for
>> stable since it improves usability of the driver and seems to fix a
>> regression?
>
>
> Yeah, probably. But when did the TTM LRU handling got upstream?
>
> Alex, wasn't that just in the current cycle? I complete lost track when
> stuff goes upstream because of the internal branch we use to work with now.

"drm/amdgpu: group BOs by log2 of the size on the LRU v2" was first in
v4.7, so it should be a candidate for 4.7.

Marek