JDK-6851908 : interpreter null check profiling broken causing extra compilation invalidation
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 6u14p
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • OS: solaris_10
  • CPU: x86
  • Submitted: 2009-06-17
  • Updated: 2010-12-08
  • Resolved: 2009-07-15
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JDK 6 JDK 7 Other
6u18Fixed 7Fixed hs16Fixed
Related Reports
Relates :  
JDK-6561457 - merge-o in fix to 6516101 bogusly sets the null_seen bit.
Description
Customer trials showing slight regression in performance with HS15 in comparison with HS10, This is more noticeable with AMD chips.
Comments
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/3f06f139ef53
27-06-2009
EVALUATION The profiling of nulls in the interpeter was accidentally removed in the putback for 6337834. http://prt-web.sfbay/net/prt-archiver.sfbay/data/archived_workspaces/main/c2_baseline/2007/20070719212032.jrose.6337834/workspace/webrevs/webrev-2007.07.19/ The fix is simply to restore that code.
26-06-2009