JDK-8233438 : Use zero_filled optimization for young gen regions when committing young regions
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 14
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2019-11-03
  • Updated: 2019-11-05
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tbdUnresolved
Related Reports
Blocks :  
JDK-8226731 - Remove StoreLoad in G1 post barrier
Description
With JDK-8226731 the young regions can be initialized as "dirty" (= value 0), as with that change the "young_card" value is not required any more.

I.e. when committing regions, on the on_commit handler for the card table should not do anything for young regions.

This (i.e. doing nothing in this case) improves startup  time.