linux-kernel - Re: [PATCH for-next v2 0/2] RDMA/rxe: Prefetching pages with explicit ODP

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Message-ID: <7e7d944b-b211-458a-8a03-b9b7b5f3dcde@gmail.com>
Date: Sun, 4 May 2025 18:23:27 +0900
From: Daisuke Matsuda <dskmtsd@...il.com>
To: Zhu Yanjun <yanjun.zhu@...ux.dev>, linux-kernel@...r.kernel.org,
 linux-rdma@...r.kernel.org, leon@...nel.org, jgg@...pe.ca,
 zyjzyj2000@...il.com
Subject: Re: [PATCH for-next v2 0/2] RDMA/rxe: Prefetching pages with explicit
 ODP

On 2025/05/04 2:08, Zhu Yanjun wrote:
> 在 2025/5/3 15:42, Daisuke Matsuda 写道:
>> There is ibv_advise_mr(3) that can be used by applications to optimize
>> memory access. This series enables the feature on rxe driver, which has
>> already been available in mlx5.
>>
>> There is a tiny change on the rdma-core util.
>> cf. https://github.com/linux-rdma/rdma-core/pull/1605
> 
> Hi, Daisuke
> 
> Thanks a lot for your efforts to this patch series. It is very nice. With this patch series, we can make prefetch for ODP MRs of RXE.
> 
> I read through this patch series. And it seems fine with me.^_^
> 
> IIRC, you have added ODP testcases in rdma-core. To verify this prefetch work well for ODP MRs, can you add this synchronous/asynchronous prefetch to the ODP testcases in rdma-core?
> 
> Thus, we can verify this patch series. And in the future, we can use these testcases to confirm this prefetch feature work well.
> 
> To now, it seems that no tool can verify this prefetch feature.

Hi, Thank you for taking a look!

There are already relevant testcases implemented in ./tests/test_odp.py:
  - test_odp_sync_prefetch_rc_traffic
  - test_odp_async_prefetch_rc_traffic
  - test_odp_prefetch_sync_no_page_fault_rc_traffic
  - test_odp_prefetch_async_no_page_fault_rc_traffic
On my node (x86-64/linux-6.15.0-rc1+), this series can pass all these tests.

Other than that, this feature is required by librpma as far as I know.
Though it is not maintained anymore, perhaps this could also be used for testing.
cf. https://github.com/pmem/rpma

Thanks,
Daisuke

> 
> Thanks a lot.
> Zhu Yanjun
> 
>>
>> Daisuke Matsuda (2):
>>    RDMA/rxe: Implement synchronous prefetch for ODP MRs
>>    RDMA/rxe: Enable asynchronous prefetch for ODP MRs
>>
>>   drivers/infiniband/sw/rxe/rxe.c     |   7 ++
>>   drivers/infiniband/sw/rxe/rxe_loc.h |  10 ++
>>   drivers/infiniband/sw/rxe/rxe_odp.c | 165 ++++++++++++++++++++++++++++
>>   3 files changed, 182 insertions(+)
>>
>