On 2019-10-24 20:03, Leo Korinth wrote:
Fixes after suggestions from Coleen, David, Erik, Igor and Kim:
http://cr.openjdk.java.net/~lkorinth/8232365/00_01/ (incremental)
http://cr.openjdk.java.net/~lkorinth/8232365/01/ (full)
Build changes now look fine.
/Magnus
Thanks,
Leo
On 18/10/2019 10:20, Leo Korinth wrote:
Hi,
Here is a patch that removes the CMS GC.
I have neither tested arm nor ppc; I hope my changes to those .ad
files are correct, if someone can test those architectures, that
would be great.
Please take an extra look at
CollectedHeap::check_for_non_bad_heap_word_value, it was buggy before
(but never called), It is now called (and hopefully correct).
I have tried to remove most parts of CMS. I have not made it a goal
to remove all traces of CMS. I guess there are much more to cleanup,
and suggestions of more to remove are welcomed. I think more
complicated cleanups should be dealt with in separate enhancements.
Not fully addressed in code, but an issue that has to be dealt with,
how do I obsolete -Xconcgc and -Xnoconcgc? I believe the option
should be obsoleted, though I do not know if we have any precedence
obsoleting -X options.
My patch prints:
$ java -Xconcgc -jar Notepad.jar
Java HotSpot(TM) 64-Bit Server VM warning: -Xconcgc uses
UseConcMarkSweepGC
I guess that is not enough for being obsolete, compare with:
$ java -XX:UseConcMarkSweepGC -jar Notepad.jar
Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option
UseConcMarkSweepGC; support was removed in 14.0
Bug:
https://bugs.openjdk.java.net/browse/JDK-8232365
Webrev:
http://cr.openjdk.java.net/~lkorinth/8232365/00
Testing:
tier 1-5.
Thanks,
Leo
