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  1. MariaDB Server
  2. MDEV-5403

Reduce usage of LOCK_open: tc_count

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Details

    • Task
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Fixed
    • 10.0.9
    • None
    • None

    Description

      tc_release_table is critical section of table cache. Among other things, it checks if table cache threshold is reached and if so evicts to-be-released table. This is done by comparing tc_count with tc_size.

      tc_count can be atomic and checked beyond of LOCK_open. Besides it is last global variable protected by this lock.

      The cost is as following:

      • tc_add_table() assumed that there is nothing to evict if tc_count > tc_size and skipped expensive LRU lookup. This assumption will be broken and LRU lookup must be done if tc_count >= tc_size.

      A patch for this task hasn't been benchmarked yet.

      Attachments

        Issue Links

          relates to

          Task - A task that needs to be done. MDEV-4702 Reduce usage of LOCK_open

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-4956 Reduce usage of LOCK_open: TABLE_SHARE::tdc.used_tables

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-5388 Reduce usage of LOCK_open: unused_tables

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-5492 Reduce usage of LOCK_open: TABLE::in_use

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-5864 Reduce usage of LOCK_open: TABLE_SHARE::tdc.free_tables

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-5597 Reduce usage of LOCK_open: LOCK_flush

          • Major - Major loss of function.
          • Closed

          Activity

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              svoj Sergey Vojtovich
              svoj Sergey Vojtovich
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              Dates

                Created:
                Updated:
                Resolved:

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