JDK-8242054 : Shenandoah: New incremental-update mode
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 8-shenandoah,11-shenandoah,13,14,15
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2020-04-02
  • Updated: 2022-02-24
  • Resolved: 2020-04-06
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JDK 14 JDK 15
14.0.2Fixed 15 b18Fixed
Related Reports
Relates :  
JDK-8242273 - Shenandoah: accept either SATB or IU barriers, but not both
Relates :  
JDK-8242082 - Shenandoah: Purge Traversal mode
Relates :  
JDK-8243008 - Shenandoah: TestVolatilesShenandoah test failed on aarch64
Description
Some of our users like some properties of the marking/traversal behaviour of the Traversal mode, but would also like the benefits and ergonomics of the normal mode. It turns out that it is relatively easy to transplant the barrier-model of Traversal mode into the regular mode. This is essentially a variant of the well-known incremental-update model of concurrent marking.
Comments
Fix Request (14u) This adds a minor Shenandoah feature to replace Traversal (removed by JDK-8242082, already backported to 14u) and provides the ground for subsequent backports. Patch applies cleanly to 14u, passes hotspot_gc_shenandoah, tier{1,2} with Shenandoah enabled. Patch is completely isolated in Shenandoah code.
13-05-2020
URL: https://hg.openjdk.java.net/jdk/jdk/rev/7a6fa1fb094d User: rkennke Date: 2020-04-06 15:12:48 +0000
06-04-2020