RFR: 8268573: Remove expired flags in JDK 19

[David Holmes]

On Tue, 14 Dec 2021 07:53:40 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Please review this simple change to remove all the flags that expired in JDK 19 from the flag table in arguments.cpp.
>> 
>> The java manpage is also updated as the UseBiasedLocking flag is moved from the "obsoleted" section, to the "removed" section. Plus we update the list of previous release docs.
>> 
>> Testing: local - all the runtime/CommandLine tests
>> 
>> Thanks,
>> David
>
> src/hotspot/share/runtime/arguments.cpp line 551:
> 
>> 549:   { "G1RSetSparseRegionEntries",    JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::jdk(19) },
>> 550:   { "AlwaysLockClassLoader",        JDK_Version::jdk(17), JDK_Version::jdk(18), JDK_Version::jdk(19) },
>> 551:   { "UseBiasedLocking",             JDK_Version::jdk(15), JDK_Version::jdk(18), JDK_Version::jdk(19) },
> 
> There are a number of servers with start scripts that specify -XX:-UseBiasedLocking. The option may be obsolete and I wonder if better to leave it as obsolete until there is more uptake of JDK 17 which does not need to disable it explicitly.

I don't understand the relevance of "uptake of JDK 17" - this change only affects 19. Anyone on 17 will get the deprecation warning as we deliberately deferred obsoleting the flag until JDK 18.

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PR: https://git.openjdk.java.net/jdk/pull/6819