RFR: 8369286: Parallel: Assertion failure in mutableNUMASpace

Tue Oct 7 13:18:18 UTC 2025

Parallel will try to expand eden to satisfy allocation request. However, the current NUMA implementation in Parallel requires a space to be empty on resizing so that the memory inside the space can be freely distributed among all NUMA nodes.

Add an early-return to `PSYoungGen::try_expand_to_hold` if NUMA is enabled and eden is not empty.

Test: tier1-3

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Commit messages:
 - pgc-eden-numa

Changes: https://git.openjdk.org/jdk/pull/27675/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27675&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8369286
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27675.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27675/head:pull/27675

PR: https://git.openjdk.org/jdk/pull/27675