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  1. MariaDB Server
  2. MDEV-24630

MY_RELAX_CPU assembly instruction upgrade/research for memory barrier on ARM

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      From the latest Mysql 8.0.23(2021/1/18) release, we found there are the same optimization towards MY_RELAX_CPU. See below
      https://github.com/mysql/mysql-server/commit/f2a4ed5b65a6c03ee1bea60b8c3bb4db64dbed10

      In current situation for Mariadb server, we introduced
      define UT_RELAX_CPU() _asm_ _volatile_ ("":::"memory")
      like https://jira.mariadb.org/browse/MDEV-23633 .

      For the specific instruction, such as DMB/DSB/ISB(https://developer.arm.com/documentation/dui0489/c/CIHGHHIE), we need to deep analysis or test on ARM, which one is good for ARM.

      So this JIRA ticket will trace the test result and following fix/upgrade for this goal. But let's wait for whether this extra operation is visible in some benchmarks.

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          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-25807 ARM build failure due to missing ISB instruction on ARMv6

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-21452 Use condition variables and normal mutexes instead of InnoDB os_event and mutex

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-23633 MY_RELAX_CPU performs unnecessary compare-and-swap on ARM

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-24142 rw_lock_t has unnecessarily complex wait logic

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-24167 InnoDB unnecessarily uses complex rw-lock implementation

          • Major - Major loss of function.
          • Closed

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              marko Marko Mäkelä
              bzhaoopenstack ZhaoBo
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