2023-05-23 meeting notes

 日期

May 23, 2023

 参与者

• @yangyicong@huawei.com

• @Jonathan Cameron

• @Vishnu Banavath

• @Leonardo Garcia

• @Joyce

 目标

• Two topics Huawei engineers wants to talk ：3 memory related topics and RAS

  1. the batched TLB flush support on arm64 to optimize the performance of unmapping and page migration on arm64

    https://lore.kernel.org/linux-mm/20230518065934.12877-1-yangyicong@huawei.com/

  1. ARM64 RAS enhancement including below content. This is important for our product since we've met some real issues.

    a) ARM64 support Machine Check safe memory copy(ARCH_HAS_COPY_MC)
       https://lore.kernel.org/lkml/20221219120008.3818828-1-tongtiangen@huawei.com/
    b) Handle synchronous exceptions with proper si_code
       https://lore.kernel.org/lkml/20230408091359.31554-1-xueshuai@linux.alibaba.com/
       

  We'd like to discuss the current status of these works, the solution and to see if there's any suggestions and worries.

• For the RAS patch, wangkefeng.wang wants to discuss further：
  He has communicated with the community and waiting for the feedback from the maintainers

  1. ARM64 MC-Safe Copy,

  Mark Rutland give some advises in v4 and all are adressed, Catain give us some comments in v8 and all are fixed too in v9. This feature is
  pushed out one years ago( in 2022/4/16), so we want to make sure that
  could it be picked up for v6.4?

  2)Handle synchronous exceptions with proper si_code
  Both Huawei and Alibaba are trying to fix the commit
  7f17b4a121d0 ("ACPI: APEI: Kick the memory_failure() queue for synchronous errors") which is from James Morse(glad to see James
  is Cced), but for now no response from Ampere/arm.

  We want the two arm64 RAS enhancements to be accepted, any comments
  and feedbacks from maintainer are appreciated

• Recordings as below:

• 
  密码： 6Vq@cQC5

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