JDK-8364414 : G1: Use simpler data structure for holding collection set candidates during calculation
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2025-07-31
  • Updated: 2025-08-01
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tbdUnresolved
Related Reports
Relates :  
JDK-8217330 - Split G1CollectionSetChooser into collection set candidate container and the chooser algorithm
Description
During calculation of the collection set candidates in the Remark pause, G1 uses an array of G1CollectionSetCandidateInfos. This struct holds a reference to a G1HeapRegion and some integer.

That latter integer is not needed during that calculation, and not modified at all by that process; since we delete that temporary data structure later anyway, it makes sense to not carry around the full G1CollectionSetCandidateInfo array while building the collection set candidates from marking.
Comments
A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk/pull/26572 Date: 2025-07-31 10:49:39 +0000
31-07-2025