Hi all,
Please review this change:
webrev:
http://cr.openjdk.java.net/~ysuenaga/JDK-8204531/webrev.00/
JBS:
https://bugs.openjdk.java.net/browse/JDK-8204531
We can use `jhsdb jsnap` to check all PerfData.
String values in PerfData are defined as jbyte array, but JSnap cannot handle
it well as following:
```
$ jhsdb jsnap --pid 28542 --all | less
sun.gc.cause=No
GC^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
```
You can see this value via `less` and `vim` on Linux. `^@` shows it is
non-ascii character.
PerfDataEntry has null-terminated C string. So we should restore as it in Java
layer.
Thanks,
Yasumasa
