8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen Summary: Fixed the output of G1SummarizeRSetStats: too small datatype for the number of concurrently processed cards, added concurrent remembered set thread time retrieval for Linux and Windows (BSD uses os::elapsedTime() now), and other cleanup. The information presented during VM operation is now relative to the previous output, not always cumulative if G1SummarizeRSetStatsPeriod > 0. At VM exit, the code prints a cumulative summary. Reviewed-by: johnc, jwilhelm

--- a/src/os/bsd/vm/os_bsd.cpp	Sat Jun 01 10:00:56 2013 +0200
+++ b/src/os/bsd/vm/os_bsd.cpp	Tue May 28 09:32:06 2013 +0200
@@ -935,10 +935,10 @@
   return (1000 * 1000);
 }
 
-// XXX: For now, code this as if BSD does not support vtime.
-bool os::supports_vtime() { return false; }
+bool os::supports_vtime() { return true; }
 bool os::enable_vtime()   { return false; }
 bool os::vtime_enabled()  { return false; }
+
 double os::elapsedVTime() {
   // better than nothing, but not much
   return elapsedTime();