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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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              Assignee:
              marko Marko Mäkelä
              Reporter:
              bzhaoopenstack ZhaoBo
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