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  1. JDK
  2. JDK-8283674

Pad ObjectMonitor allocation size to cache line size

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Details

    • Bug
    • Resolution: Won't Fix
    • P4
    • tbd
    • 19
    • hotspot
    • None

    Description

      See discussion under [1].

      Since the libc malloc allocator may place ObjectMonitor instances adjacent to each other, we should pad the size of ObjectMonitor to fill a whole cache line to prevent false sharing between adjacent OMs.

      [1] https://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2022-March/054187.html

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8049737 Contended Locking reorder and cache line bucket

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Enhancement - null JDK-8253064 monitor list simplifications and getting rid of TSM

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          links to

          Review Review openjdk/jdk/7955

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              stuefe Thomas Stuefe
              stuefe Thomas Stuefe
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              Dates

                Created:
                Updated:
                Resolved: