src/hotspot/share/runtime/serviceThread.cpp

rev 56044 : imported patch 8230184.patch
rev 56046 : v2.00 -> v2.05 (CR5/v2.05/8-for-jdk13) patches combined into one; merge with 8229212.patch; merge with jdk-14+11; merge with 8230184.patch.
rev 56049 : Merge the remainder of the lock-free monitor list changes from v2.06 with v2.06a and v2.06b after running the changes through the edit scripts; merge pieces from dcubed.monitor_deflate_conc.v2.06d in dcubed.monitor_deflate_conc.v2.06[ac]; merge pieces from dcubed.monitor_deflate_conc.v2.06e into dcubed.monitor_deflate_conc.v2.06c; merge with jdk-14+11; test work around for test/jdk/tools/jlink/multireleasejar/JLinkMultiReleaseJarTest.java should not been needed anymore.

*** 188,216 ****
  
      if (deflate_idle_monitors) {
        // Deflate any global idle monitors.
        ObjectSynchronizer::deflate_global_idle_monitors_using_JT();
  
-       // deflate_per_thread_idle_monitors_using_JT() is called by
-       // each JavaThread from ObjectSynchronizer::omAlloc() as needed.
        int count = 0;
        for (JavaThreadIteratorWithHandle jtiwh; JavaThread *jt = jtiwh.next(); ) {
!         if (jt->om_in_use_count > 0) {
!           // This JavaThread is using monitors so request deflation.
!           jt->om_request_deflation = true;
            count++;
          }
        }
        if (count > 0) {
!         log_debug(monitorinflation)("requesting async deflation of idle monitors for %d thread(s).", count);
        }
        // The ServiceThread's async deflation request has been processed.
        ObjectSynchronizer::set_is_async_deflation_requested(false);
- 
-       // The global in-use list was handled above, but the request won't
-       // be complete until the JavaThreads have handled their in-use
-       // lists. This is the nature of an async deflation request.
      }
    }
  }
  
  bool ServiceThread::is_service_thread(Thread* thread) {
--- 188,212 ----
  
      if (deflate_idle_monitors) {
        // Deflate any global idle monitors.
        ObjectSynchronizer::deflate_global_idle_monitors_using_JT();
  
        int count = 0;
        for (JavaThreadIteratorWithHandle jtiwh; JavaThread *jt = jtiwh.next(); ) {
!         if (jt->om_in_use_count > 0 && !jt->is_exiting()) {
!           // This JavaThread is using ObjectMonitors so deflate any that
!           // are idle unless this JavaThread is exiting; do not race with
!           // ObjectSynchronizer::om_flush().
!           ObjectSynchronizer::deflate_per_thread_idle_monitors_using_JT(jt);
            count++;
          }
        }
        if (count > 0) {
!         log_debug(monitorinflation)("did async deflation of idle monitors for %d thread(s).", count);
        }
        // The ServiceThread's async deflation request has been processed.
        ObjectSynchronizer::set_is_async_deflation_requested(false);
      }
    }
  }
  
  bool ServiceThread::is_service_thread(Thread* thread) {