JDK-8331743 : make lightweight locking interpreter frames more compact
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Priority: P4
  • Status: Closed
  • Resolution: Not an Issue
  • Submitted: 2024-05-06
  • Updated: 2024-07-30
  • Resolved: 2024-07-30
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JDK 24
24Resolved
Related Reports
Relates :  
JDK-8315884 - New Object to ObjectMonitor mapping
Relates :  
JDK-8331742 - make lightweight locking compiled frames more compact
Description
Lightweight locking doesn't appear to use the displaced header slot in the BasicLock stack record of interpreter frames. We could save some stack space if we made its use and allocation conditional on the locking mode.
Comments
In JDK-8315884 the displaced header slot will be used to store the ObjectMonitor to make unlocking find the ObjectMonitor faster for the locked object. https://github.com/openjdk/jdk/pull/20067/files#diff-3673633e09f00548edd90fbfb16ae6d9360f5e790c5dd3d75b3fc7a577d89c9fR46 Closing as NAI.
30-07-2024