# OMWorld Tasks

Umbrella issue tracking the work being done on OMWorld in the Lilliput project.

The main goal with OMWorld is to provide a mechanism for associating an ObjectMonitor with an Object and discovering such an association in a way that all threads and contexts agree upon which ObjectMonitor to use without disturbing the non-lock-bits of the mark word.

The development of OMWorld is done one the `omworld-jdk` branch in the Lilliput repo (https://github.com/openjdk/lilliput/tree/omworld-jdk). This work is based on-top of the latest jdk:jdk. The merge and integration is done in the `omworld` branch in the Lilliput repo and is tracked in a separate issue.

The follow is a non-exhaustive list of issues. As more tasks comes along add them to the list and create an appropriate sub-task is applicable.

* Enhancements / Investigations
  * Finalize the OMCache
    * Add cache lookup unrolling
      * Implementation: JDK-8326752
      * Evaluation: JDK-8326759
    * Use AoS: JDK-8326753
    * Evaluate the Cache Size: JDK-8326759
  * Hash Table
    * Resizing-Safepoint interaction:
    * Resizing Heuristics:
    * Initial/Max/Min sizing:
  * Spinning
    * Fixed pre-spin evaluation:
    * Deflation spinning
      * Evaluate Safepoint interactions:
  * Cleanups
    * BasicLock* cleanup, remove 32-bit runtime implementation dependencies
  * Unification
    * Unify LM_LIGHTWEIGHT and LM_PLACEHOLDER
* Bugs
  * Fix invalid markWord transition leading to ABA issues: JDK-8326761
* Performance
  * TODO