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  1. MariaDB Server
  2. MDEV-10813

Clean-up InnoDB atomics, memory barriers and mutexes

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    • 10.2.3-1, 10.2.3-2

    Description

      InnoDB atomics implementation is getting worse: 5.7 implementation is not maintainable. We should remove it and use atomics provided by server instead.

      InnoDB is now full of meaningless memory barriers, these should be removed along with memory barriers implementation.

      We should restore fixes for InnoDB rwlocks.

      Mutexes should be cleaned up so that their code is readable. Also we should ensure that mutexes issue proper memory barriers.

      NOTE: there're 4 mutex implementations in InnoDB: futex base, spin lock (never used), pthread/critical_section based, event based (default). We should consider removing 3 implementations and leaving only pthread/critical_section based solution.

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          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-22859 Possible hang in InnoDB rw_lock_lock_word_decr()

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

          Task - A task that needs to be done. MDEV-6113 merge 5.7 innodb

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-6654 Combine ib_mutex_t::waiters and ib_mutex_t::lock_word

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-14304 Unnecessary conditions in buf_page_get_gen()

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-18724 Replace buf_block_t::mutex with more std::atomic

          • Major - Major loss of function.
          • Closed

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              svoj Sergey Vojtovich
              svoj Sergey Vojtovich
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              Dates

                Created:
                Updated:
                Resolved:

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