JDK-8274077 : Make collection set regions not need remembered set update during GC
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 18
  • Priority: P4
  • Status: New
  • Resolution: Unresolved
  • Submitted: 2021-09-21
  • Updated: 2021-09-21
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Other
tbdUnresolved
Related Reports
Blocks :  
JDK-8271880 - Tighten condition for excluding regions from collecting cards with cross-references
Description
By not making collection set regions (not candidates!) mark as not needing remembered set update, some checks in the calculations whether a reference should be enqueued can be simplified after JDK-8271880 as suggested by [~ayang].

Initial tests show this is correct because either
- the collection set region will be empty after gc and collected
- the collection set region will have failed evacuation but g1 currently never builds remembered sets for these regions

Do some more testing on this too.