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  1. MariaDB Server
  2. MDEV-23633

MY_RELAX_CPU performs unnecessary compare-and-swap on ARM

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    Description

      This is basically a re-request to fix MDEV-14374 as it was described. On target architectures where nothing special is available (not IA-32, AMD64, POWER), the macro UT_RELAX_CPU() would perform a dummy compare-and-swap operation.

      According to krunalbauskar, this extra operation is visible in some benchmarks.

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          Task - A task that needs to be done. MDEV-23635 Add notional delay (using existing ut_delay) while spinning for registering reader in rw-locks

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-14374 UT_DELAY code : Removing hardware barrier for arm64 bit platform

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-24630 MY_RELAX_CPU assembly instruction upgrade/research for memory barrier on ARM

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

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              marko Marko Mäkelä
              marko Marko Mäkelä
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                Resolved:

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