Providing users with thread type

[Jean Christophe Beyler]

Hi all,

When doing profiling, often users have a hard time determining what is
happening inside libjvm.so. When doing profiling, the JVM seems like a
black box and it is hard to differentiate between a thread doing
GC/Compile/Actual VM work since all they get is profiles from libjvm.so but
not what are the various profiles doing.

We have a small patch that provides a method to users to ask what is the
type of the current thread, which then provides one of those types
(GC/Compile/Actual VM work).

I'd like to ask if this seems like a reasonable thing to do and should I
work on providing this via a JVMTI call. Something like
GetCurrentThreadType.

What do you all think? Is this sane and possible to try to push forward?

Thanks for your opinions,
Jc
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