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  1. MariaDB Server
  2. MDEV-8010

Avoid sql_alloc() in Items

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Details

    • Task
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Fixed
    • 10.1.7
    • OTHER
    • None

    Description

      sql_alloc() has additional costs compared to direct mem_root allocation:

      • function call: it is defined in a separate translation unit and can't be inlined
      • it needs to call pthread_getspecific() to get THD::mem_root

      It is called dozens of times implicitly by Items. Try to get rid of those calls.

      Attachments

        1. mdev8010.patch
          653 kB
          Sergey Vojtovich

        Issue Links

          is part of

          Task - A task that needs to be done. MDEV-6152 Remove calls to current_thd while creating Item

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

                Created:
                Updated:
                Resolved:

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