[PATCH v2 0/5] drm/ttm, amdgpu: Introduce LRU bulk move functionality

[Mike Lothian]

Hi

I've been testing these patches over the weekend on my Tonga and Raven
systems

Tested-by: Mike Lothian <mike at fireburn.co.uk>

Cheers

Mike

On Fri, 10 Aug 2018 at 12:56 Huang Rui <ray.huang at amd.com> wrote:

> The idea and proposal is originally from Christian, and I continue to work
> to
> deliver it.
>
> Background:
> amdgpu driver will move all PD/PT and PerVM BOs into idle list. Then move
> all of
> them on the end of LRU list one by one. Thus, that cause so many BOs moved
> to
> the end of the LRU, and impact performance seriously.
>
> Then Christian provided a workaround to not move PD/PT BOs on LRU with
> below
> patch:
> "drm/amdgpu: band aid validating VM PTs"
> Commit 0bbf32026cf5ba41e9922b30e26e1bed1ecd38ae
>
> However, the final solution should bulk move all PD/PT and PerVM BOs on
> the LRU
> instead of one by one.
>
> Whenever amdgpu_vm_validate_pt_bos() is called and we have BOs which need
> to be
> validated we move all BOs together to the end of the LRU without dropping
> the
> lock for the LRU.
>
> While doing so we note the beginning and end of this block in the LRU list.
>
> Now when amdgpu_vm_validate_pt_bos() is called and we don't have anything
> to do,
> we don't move every BO one by one, but instead cut the LRU list into
> pieces so
> that we bulk move everything to the end in just one operation.
>
> Test data:
>
> +--------------+-----------------+-----------+---------------------------------------+
> |              |The Talos        |Clpeak(OCL)|BusSpeedReadback(OCL)
>           |
> |              |Principle(Vulkan)|           |
>            |
>
> +------------------------------------------------------------------------------------+
> |              |                 |           |0.319 ms(1k) 0.314 ms(2K)
> 0.308 ms(4K) |
> | Original     |  147.7 FPS      |  76.86 us |0.307 ms(8K) 0.310 ms(16K)
>            |
>
> +------------------------------------------------------------------------------------+
> | Orignial + WA|                 |           |0.254 ms(1K) 0.241 ms(2K)
>           |
> |(don't move   |  162.1 FPS      |  42.15 us |0.230 ms(4K) 0.223 ms(8K)
> 0.204 ms(16K)|
> |PT BOs on LRU)|                 |           |
>            |
>
> +------------------------------------------------------------------------------------+
> | Bulk move    |  163.1 FPS      |  40.52 us |0.244 ms(1K) 0.252 ms(2K)
> 0.213 ms(4K) |
> |              |                 |           |0.214 ms(8K) 0.225 ms(16K)
>            |
>
> +--------------+-----------------+-----------+---------------------------------------+
>
> After test them with above three benchmarks include vulkan and opencl. We
> can
> see the visible improvement than original, and even better than original
> with
> workaround.
>
> Changes from V1 -> V2:
> - Fix to missed the BOs in relocated/moved that should be also moved to
> the end
>   of LRU.
>
> Thanks,
> Rui
>
> Christian König (2):
>   drm/ttm: add helper structures for bulk moves on lru list
>   drm/ttm: revise ttm_bo_move_to_lru_tail to support bulk moves
>
> Huang Rui (3):
>   drm/ttm: add bulk move function on LRU
>   drm/amdgpu: use bulk moves for efficient VM LRU handling (v2)
>   drm/amdgpu: move PD/PT bos on LRU again
>
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 77
> +++++++++++++++++++++++++--------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h |  4 ++
>  drivers/gpu/drm/ttm/ttm_bo.c           | 78
> +++++++++++++++++++++++++++++++++-
>  include/drm/ttm/ttm_bo_api.h           | 16 ++++++-
>  include/drm/ttm/ttm_bo_driver.h        | 28 ++++++++++++
>  5 files changed, 184 insertions(+), 19 deletions(-)
>
> --
> 2.7.4
>
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>
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