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Bug ID: 6851908 interpreter null check profiling broken causing extra compilation invalidation
6851908 : interpreter null check profiling broken causing extra compilation invalidation

Details
Type:
Bug
Submit Date:
2009-06-17
Status:
Resolved
Updated Date:
2010-12-08
Project Name:
JDK
Resolved Date:
2009-07-15
Component:
hotspot
OS:
solaris_10
Sub-Component:
compiler
CPU:
x86
Priority:
P3
Resolution:
Fixed
Affected Versions:
6u14p
Fixed Versions:
hs16

Related Reports
Backport:
JDK-2180092 - interpreter null check profiling broken causing extra compilation invalidation
Backport:
JDK-2180659 - interpreter null check profiling broken causing extra compilation invalidation
Relates:
JDK-6561457 - merge-o in fix to 6516101 bogusly sets the null_seen bit.

Sub Tasks

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
2009-06-27 
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.
2009-06-26


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