RFR(XXS/S): 8230940: Obsolete MonitorBound

[Daniel D. Daugherty]

Greetings,

I have a fix for the following bug:

   JDK-8230940 Obsolete MonitorBound
   https://bugs.openjdk.java.net/browse/JDK-8230940

This fix is marked as "XXS" and "S". It is "XXS" because it is primarily
code deletion and it is "S" because there are 83 changed lines.

The change in src/hotspot/share/runtime/flags/jvmFlag.cpp is the only
one that's not obvious. I updated the example with MaxInlineSize to
replace MonitorBound because both are 'intx' flags with the same range:
(0, max_jint) so the update was just changing the name.

Webrev URL: http://cr.openjdk.java.net/~dcubed/8230940-webrev/0-for-jdk15/

This fix has been tested with a Mach5 Tier[1-3] job set on the usual
Oracle platforms. No regressions.

The open and closed repos have been searched with the following patterns:

MonitorBound|check_for_forced_cleanup|is_forced_cleanup_needed|_forceMonitorScavenge|is_MonitorBound_exceeded|needs_monitor_scavenge|InduceScavenge

with no unexpected results.


Here's what we see with the current baseline:

$ build/macosx-x86_64-normal-server-release/images/jdk/bin/java 
-XX:MonitorBound=1000 -version
Java HotSpot(TM) 64-Bit Server VM warning: Temporarily processing option 
MonitorBound; support is scheduled for removal in 15.0
Java HotSpot(TM) 64-Bit Server VM warning: Temporarily processing option 
MonitorBound; support is scheduled for removal in 15.0
java version "15-internal" 2020-09-15
Java(TM) SE Runtime Environment (build 
15-internal+0-2020-05-01-0300239.dcubed...)
Java HotSpot(TM) 64-Bit Server VM (build 
15-internal+0-2020-05-01-0300239.dcubed..., mixed mode, sharing)


With the fix in place, here's what we see:

$ $JAVA_HOME/bin/java -XX:MonitorBound=1000 -version
Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option MonitorBound; 
support was removed in 15.0
java version "15-internal" 2020-09-15
Java(TM) SE Runtime Environment (build 
15-internal+0-2020-05-01-1817475.dcubed...)
Java HotSpot(TM) 64-Bit Server VM (build 
15-internal+0-2020-05-01-1817475.dcubed..., mixed mode, sharing)


Thanks, in advance, for any comments, questions or suggestions.

Dan