src/hotspot/share/gc/g1/g1YoungRemSetSamplingThread.cpp

rev 53920 : imported patch 8218880-g1-crashes-periodic-gc-gclocker
rev 53922 : [mq]: 8218880-kbarrett-review

*** 1,7 ****
  /*
!  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
--- 1,7 ----
  /*
!  * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
*** 87,97 ****
      return;
    }
    if ((os::elapsedTime() - _last_periodic_gc_attempt_s) > (G1PeriodicGCInterval / 1000.0)) {
      log_debug(gc, periodic)("Checking for periodic GC.");
      if (should_start_periodic_gc()) {
!       Universe::heap()->collect(GCCause::_g1_periodic_collection);
      }
      _last_periodic_gc_attempt_s = os::elapsedTime();
    }
  }
  
--- 87,100 ----
      return;
    }
    if ((os::elapsedTime() - _last_periodic_gc_attempt_s) > (G1PeriodicGCInterval / 1000.0)) {
      log_debug(gc, periodic)("Checking for periodic GC.");
      if (should_start_periodic_gc()) {
!       if (!G1CollectedHeap::heap()->try_collect(GCCause::_g1_periodic_collection,
!                                                     false /* retry_on_vmop_failure */)) {
!         log_debug(gc, periodic)("GC request denied. Skipping.");
!       }
      }
      _last_periodic_gc_attempt_s = os::elapsedTime();
    }
  }