JDK-8153333: [REDO] STW phases at Concurrent GC should count in PerfCounter

[Yasumasa Suenaga]

Hi all,

I changed PerfCounter to show CGC STW phase in jstat in JDK-8151674.
However, it occurred several jtreg test failure, so it was back-outed.

I want to resume to work for this issue.

http://cr.openjdk.java.net/~ysuenaga/JDK-8153333/webrev.03/hotspot/
http://cr.openjdk.java.net/~ysuenaga/JDK-8153333/webrev.03/jdk/

These changes are work fine on jtreg test as below:

  hotspot/test/serviceability/tmtools/jstat
  jdk/test/sun/tools


Since JDK 9, default GC algorithm is set to G1.
So I think this change is useful to watch GC behavior through jstat.

I cannot access JPRT. Could you help?


Thanks,

Yasumasa