RFR: Parallel safepoint cleaning

[Aleksey Shipilev]

On 05/23/2017 10:50 PM, Roman Kennke wrote:
> http://cr.openjdk.java.net/~rkennke/par-sp-cleaning/webrev.02/

Leftover:

 594     double start = os::elapsedTime();
 ...
 600     double end = os::elapsedTime();
 601     tty->print_cr("vmthread took: %f ms for symbol table rehash", (end -
start) * 1000.0);


Empty condition?

4397   VM_Operation* op = VMThread::vm_operation();
4398   if (op != NULL && op->marks_nmethods()) {
4399   }


Otherwise seems fine.

-Aleksey