JDK-8059758 : Footprint regressions with JDK-8038423
  • Type: Bug
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 8u40,9
  • Priority: P2
  • Status: Closed
  • Resolution: Fixed
  • Submitted: 2014-10-06
  • Updated: 2017-07-26
  • Resolved: 2014-10-09
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8u40Fixed 9 b37Fixed
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Recent changes in JDK-8038423 allow G1 to decommit regions within the heap freely, the VM always initializes associated auxiliary data structures (BOT, card table, mark bitmaps).

This works somewhat against OSes lazy initialization of committed pages where they are actually only backed by physical memory on the first access.

These startup benchmarks never actually use this memory because they are so simple, so this causes a footprint regression with the mentioned change.
Manually by running performance testing before review.

Medium performance regression -> P2