JDK-8226409 : Enable argument profiling for sun.misc.Unsafe.put*/get*
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 11,13,14
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2019-06-19
  • Updated: 2022-06-27
  • Resolved: 2019-07-05
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JDK 11 JDK 13 JDK 14
11.0.5Fixed 13.0.4Fixed 14 b05Fixed
Related Reports
Duplicate :  
JDK-8224182 - [Performance] sun.misc.Unsafe.[put|get]* suffer from redundant memory barriers
Relates :  
JDK-8181211 - C2: Use profiling data to optimize on/off heap unsafe accesses
Description
JDK-8181211 enabled argument profiling for jdk.internal.misc.Unsafe.
Since sun.misc.Unsafe delegates to jdk.internal.misc.Unsafe, profiling info is mostly useless there since it is almost always polluted.
Comments
Fix request (13u): The change applies cleanly, tested with tier1.
15-05-2020
Fix Request: change applies cleanly. Tested with tier1. This simple change helps performance and mirror a change that already exists for jdk.internal.misc.Unsafe. The change was pushed earlier this month. There was no follow up issues that I'm aware of.
30-07-2019
URL: http://hg.openjdk.java.net/jdk/jdk/rev/cf5a438b3c41 User: vlivanov Date: 2019-07-05 09:56:48 +0000
05-07-2019