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  1. Lustre
  2. LU-8978

improve conurrency in ZFS's SA

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    Details

    • Type: Improvement
    • Status: Open
    • Priority: Minor
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Labels:
    • Rank (Obsolete):
      9223372036854775807

      Description

      all SA updates in a object set are serialized with a global mutex. given SA is used to store regular attributes and EAs, it's very expensive to update any of them, especially in a multi-thread and/or multi-core environment.
      the mutex (sa_lock) is used to protect a structure listing all known SA configurations.
      it's possible to cache references to few frequently-used configurations on per-cpu basis and skip the mutex in the majorify of cases - this is proved by a prototype patch. the patch still needs some polishing and inspections on ZoL

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              Assignee:
              bzzz Alex Zhuravlev
              Reporter:
              bzzz Alex Zhuravlev
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                Dates

                Created:
                Updated: