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  1. MariaDB Server
  2. MDEV-18851

modernise Linux Large Page support (multiplesizes)

Details

    Description

      Large page support for MariaDB has a number of problems

      1. MDEV-18726 - innodb allocates chunks larger than innodb_buffer_pool_chunk_size
      2. granularity - Linux has supported multiple large page sizes since kernel ~2.6.32. MariaDB needs multiple large page sizes to support a 128M key_cache_size/aria_pagecache_buffer_size to a larger 1G innodb_buffer_pool_chunk_size
      3. using shared memory means that kernel limits of kernel.shmall or kernel.shmmax need to be adjusted (and the biggest clue in the log is `Failed to attach shared memory segment, errno 22`)
      4. innodb falls back to conventional mmap if shmget SHM_HUGETLB fails, meaning the deallocation attempts to use shmdt on an mmapped segment.

      Attachments

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          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-26533 MariaDB 10.5 and 10.6 crashes with key_buffer_size greater than 4Gb on Windows 64bit

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-18726 INNDOB gets confused when using large pages if pages=1G

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-25424 my_multi_malloc_large doesn't do large allocations

          • Major - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. MDEV-21239 ASAN use-after-poison in a server shutdown in innodb.innodb_buffer_pool_resize

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-22135 Document changes to large/huge page support in 10.5

          • Major - Major loss of function.
          • Closed

          DOCS-2782 Loading...

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            People

              svoj Sergey Vojtovich
              danblack Daniel Black
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              Dates

                Created:
                Updated:
                Resolved:

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