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src/hotspot/share/gc/shared/gcArguments.cpp

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  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #include "precompiled.hpp"
  27 #include "gc/shared/gcArguments.hpp"
  28 #include "runtime/arguments.hpp"
  29 #include "runtime/globals.hpp"
  30 #include "runtime/globals_extension.hpp"
  31 #include "utilities/macros.hpp"
  32 
  33 void GCArguments::initialize() {
  34 #if INCLUDE_ALL_GCS












  35   if (MinHeapFreeRatio == 100) {
  36     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
  37     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
  38   }
  39 
  40   // If class unloading is disabled, also disable concurrent class unloading.
  41   if (!ClassUnloading) {
  42     FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
  43     FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
  44   }
  45 #endif // INCLUDE_ALL_GCS
  46 }


  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #include "precompiled.hpp"
  27 #include "gc/shared/gcArguments.hpp"
  28 #include "runtime/arguments.hpp"
  29 #include "runtime/globals.hpp"
  30 #include "runtime/globals_extension.hpp"
  31 #include "utilities/macros.hpp"
  32 
  33 void GCArguments::initialize() {
  34   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
  35     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
  36   }
  37 
  38   if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
  39     FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
  40   }
  41 
  42   if (GCTimeLimit == 100) {
  43     // Turn off gc-overhead-limit-exceeded checks
  44     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
  45   }
  46 
  47   if (MinHeapFreeRatio == 100) {
  48     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
  49     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
  50   }
  51 

  52   if (!ClassUnloading) {
  53     // If class unloading is disabled, also disable concurrent class unloading.
  54     FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
  55   }

  56 }
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