Uploaded image for project: 'Lustre'
  1. Lustre
  2. LU-7896

lu_object_limit() is called too frequently

    XMLWordPrintable

Details

    • Improvement
    • Resolution: Fixed
    • Minor
    • Lustre 2.9.0
    • None
    • None
    • 9223372036854775807

    Description

      with ZFS the number of objects in LU cache is limited, so any lu_object_new() checks whether the limit is exceeded. so, at some point it's called for every new object and worse - many threads got blocked in lu_site_purge() due to that. we don't need that strong semantics for the number of cached object, this should be fixed in a way to purge objects in batches in non-blocking manner.

      Attachments

        Issue Links

          is blocking

          Improvement - An improvement or enhancement to an existing feature or task. LU-7895 zfs metadata performance improvements

          • Major - Major loss of function.
          • Resolved
          is related to

          Bug - A problem which impairs or prevents the functions of the product. LU-7997 RCU stalls waiting for lu_sites_guard mutex in lu_cache_shrink_count

          • Major - Major loss of function.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. LU-5749 osd-zfs: object creation may serialize on lu_site::ls_purge_mutex

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Activity

            People

              bzzz Alex Zhuravlev
              bzzz Alex Zhuravlev
              Votes:
              0 Vote for this issue
              Watchers:
              4 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: