Using ShenandoahGC forces NUMAInterleaving on

[Tom Babinski]

Hello,

If Shenandoah is turned on with the command line parameters

   -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC

then NUMAInterleaving is forced on, even if it is explicitly turned off with

   -XX:-UseNUMAInterleaving

To reproduce, run

    java -XX:+PrintFlagsFinal -XX:-UseNUMAInterleaving
-XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC --version | grep
UseNUMAInterleaving

You should see the following output:

    bool UseNUMAInterleaving                      = true
                   {product} {command line}

Version:
openjdk 12.0.2 2019-07-16
OpenJDK Runtime Environment AdoptOpenJDK (build 12.0.2+10)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 12.0.2+10, mixed mode,
sharing)

Centos/7
Kernel: 3.10.0-862.14.4.el7.x86_64

Any thoughts?  We run an application with numactl --membind=<node> to force
memory allocation onto a specific numa node.  However, when we turn on
Shenandoah, we can observe memory being allocated on a different numa node
(using numastat -p)

Thanks,
Tom