RFR: Add support for CollectedHeap::get_safepoint_workers()

Per Liden per.liden at oracle.com
Tue May 8 14:49:46 UTC 2018

Added support for CollectedHeap::get_safepoint_workers(), to reduce 
safepoint cleanup times.


Here are some numbers on from SPECjbb2015, which look encouraging.


Safepoint cleanup tasks (secs):
                 avg: 0.00286622 (+/-0.00189263)
     95th percentile: 0.0059704
     99th percentile: 0.006819
   99.9th percentile: 0.0089186
  99.99th percentile: 0.0117573
                 max: 0.0117573


Safepoint cleanup tasks (secs):
                 avg: 0.000676487 (+/-0.000212009)
     95th percentile: 0.0010262
     99th percentile: 0.0011429
   99.9th percentile: 0.0012933
  99.99th percentile: 0.0013363
                 max: 0.0013363


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