RFR 8226310: Shenandoah: Concurrent evacuation of CLDG

Roman Kennke rkennke at redhat.com
Mon Jun 24 17:18:08 UTC 2019

Hi Zhengyu,

> Please review this patch that moves evacuation of CLDG to concurrent phase.
> Bug: https://bugs.openjdk.java.net/browse/JDK-8226310
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8226310/webrev.00/
> Test:
>   hotspot_gc_shenandoah (fastdebug and release)


+  ShenandoahClassLoaderDataRoots<true /*concurrent*/, false /*single
threaded*/> _cld_roots;

Why is it only single-threaded? Does it matter?

Do you think this is back-portable?

The question came up in IRC if we should start pushing this to sh/jdk
for the start, let it bake there a little and at some point push it to
jdk/jdk in one change. It doesn't have to be now, and I guess it depends
upon how risky it is.


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