JDK-8267831 : Improve G1CardSetAllocator sizing heuristics
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 18
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2021-05-27
  • Updated: 2021-05-28
The Version table provides details related to the release that this issue/RFE will be addressed.

Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

To download the current JDK release, click here.
Other
tbdUnresolved
Related Reports
Blocks :  
JDK-8017163 - G1: Refactor remembered sets
Description
In JDK-8017163 card set allocator sizing heuristics (that is, initial buffer sizes etc) are reset after freeing them.

Investigate whether it makes sense to not start all over again every time with sizing to avoid some allocations.

Another avenue of investigation should be to see if the existing sizing bounds (i.e. at some point we start doubling the amount of pre-allocated buffers in the arenas, see see��G1CardSetConfiguration::mem_object_alloc_options()) could be improved.