Hi,please review this patch to clean up and make sun.management.HotspotCompilation behave nice if the VM would decide to no longer expose per-compiler thread perf counters:
webrev: http://cr.openjdk.java.net/~redestad/jdk9/8134583/webrev.00/ bug: https://bugs.openjdk.java.net/browse/JDK-8134583 /Claes
