serviceability/tmtools/jstat tests times out with -Xcomp

Following tests timeout in JDK 14 CI with -Xcomp:
- serviceability/tmtools/jstat/GcTest01.java
- serviceability/tmtools/jstat/GcCauseTest02.java
- serviceability/tmtools/jstat/GcTest02.java

#Sample test log extract:
.......
#section:main
----------messages:(7/589)----------
command: main -XX:+IgnoreUnrecognizedVMOptions -XX:-VerifyDependencies -XX:+UsePerfData -XX:MaxNewSize=4m -XX:MaxHeapSize=128M -XX:MaxMetaspaceSize=128M GcTest02
reason: User specified action: run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-VerifyDependencies -XX:+UsePerfData -XX:MaxNewSize=4m -XX:MaxHeapSize=128M -XX:MaxMetaspaceSize=128M GcTest02
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.base --add-exports java.base/jdk.internal.misc=ALL-UNNAMED
Timeout information:
--- Timeout information end.
elapsed time (seconds): 1228.555
----------configuration:(4/111)----------
Boot Layer
  add modules: java.base
  add exports: java.base/jdk.internal.misc ALL-UNNAMED

----------System.out:(9/654)----------
[2019-09-20T21:00:56.362534Z] Gathering output for process 19665
[2019-09-20T21:00:58.073087Z] Waiting for completion for process 19665
[2019-09-20T21:00:58.093489Z] Waiting for completion finished for process 19665
Process output: Exit code: 0
stdout: S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT CGC CGCT GCT
 0.0 0.0 0.0 0.0 5120.0 3072.0 125952.0 0.0 0.0 0.0 0.0 0.0 0 0.000 0 0.000 0 0.000 0.000
stderr:
[2019-09-20T21:01:13.536906Z] Gathering output for process 19873
Timeout refired 1200 times
........................