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Use mlock2() instead of mlock() on Linux and use mlockall(MCL_FUTURE). #98

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Use mlock2() instead of mlock() on Linux and use mlockall(MCL_FUTURE). #98

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Commits on Mar 2, 2024

  1. Use mlock2() instead of mlock() on Linux and use mlockall(MCL_FUTURE). 

    Use mlock2() instead of mlock() on Linux:
  - mlock2() allows a third argument MLOCK_ONFAULT, which allow to
    lock the pages in a range before touching them, so mlock2()
    can be called before touching all pages instead of after.
  - "vmtouch -t -l" some_file would not keep the pages in cache
    after touching them, so at the lock() step they needed to
    be read again from disk. After this patch files are cached
    twice as fast on this system.

Use mlockall(MCL_FUTURE) instead of mlockall(MCL_CURRENT):
  - Set mlockall(MCL_FUTURE) before touching pages to have similar
    behaviour as the mlock2() approach above.
    @ghuls
    ghuls committed Mar 2, 2024
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