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  1. MariaDB Server
  2. MDEV-12266

Reduce the number of InnoDB tablespace lookups

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    • Sprint:
      10.3.6-1

      Description

      InnoDB used to hide the definition of fil_space_t and use numeric tablespace ID everywhere. This causes a large number of tablespace lookups and thus contention on the fil_system->mutex.

      We should store fil_space_t* where possible to reduce the number of tablespace lookups:

      • fil_system->sys_space for the innodb_system tablespace
      • fil_system->temp_space for the innodb_temporary tablespace
      • dict_table_t::space for user tables
      • optionally, rseg_t::space for rollback segment header pages and and undo logs

      Also, we should use atomic memory access in fil_space_release() and avoid acquiring the mutex there. Furthermore, some accessor functions, such as fil_space_get_type() and fil_space_get_first_path() must be removed.

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              • Assignee:
                marko Marko Mäkelä
                Reporter:
                ratzpo Rasmus Johansson
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