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src/hotspot/share/gc/shenandoah/heuristics/shenandoahStaticHeuristics.cpp

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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 
  27 #include "gc/shenandoah/heuristics/shenandoahStaticHeuristics.hpp"
  28 #include "gc/shenandoah/shenandoahCollectionSet.hpp"
  29 #include "gc/shenandoah/shenandoahFreeSet.hpp"
  30 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
  31 #include "logging/log.hpp"
  32 #include "logging/logTag.hpp"
  33 
  34 ShenandoahStaticHeuristics::ShenandoahStaticHeuristics() : ShenandoahHeuristics() {
  35   SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent);
  36   SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent);
  37 
  38   // Final configuration checks
  39   SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier);
  40   SHENANDOAH_CHECK_FLAG_SET(ShenandoahSATBBarrier);
  41   SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier);
  42   SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier);
  43 }
  44 
  45 ShenandoahStaticHeuristics::~ShenandoahStaticHeuristics() {}
  46 
  47 bool ShenandoahStaticHeuristics::should_start_gc() const {
  48   ShenandoahHeap* heap = ShenandoahHeap::heap();
  49 
  50   size_t capacity = heap->max_capacity();
  51   size_t available = heap->free_set()->available();
  52   size_t threshold_available = capacity / 100 * ShenandoahMinFreeThreshold;
  53 
  54   if (available < threshold_available) {
  55     log_info(gc)("Trigger: Free (" SIZE_FORMAT "%s) is below minimum threshold (" SIZE_FORMAT "%s)",
  56                  byte_size_in_proper_unit(available),           proper_unit_for_byte_size(available),
  57                  byte_size_in_proper_unit(threshold_available), proper_unit_for_byte_size(threshold_available));
  58     return true;
  59   }
  60   return ShenandoahHeuristics::should_start_gc();
  61 }
  62 




  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 
  27 #include "gc/shenandoah/heuristics/shenandoahStaticHeuristics.hpp"
  28 #include "gc/shenandoah/shenandoahCollectionSet.hpp"
  29 #include "gc/shenandoah/shenandoahFreeSet.hpp"
  30 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
  31 #include "logging/log.hpp"
  32 #include "logging/logTag.hpp"
  33 
  34 ShenandoahStaticHeuristics::ShenandoahStaticHeuristics() : ShenandoahHeuristics() {
  35   SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent);
  36   SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent);






  37 }
  38 
  39 ShenandoahStaticHeuristics::~ShenandoahStaticHeuristics() {}
  40 
  41 bool ShenandoahStaticHeuristics::should_start_gc() const {
  42   ShenandoahHeap* heap = ShenandoahHeap::heap();
  43 
  44   size_t capacity = heap->max_capacity();
  45   size_t available = heap->free_set()->available();
  46   size_t threshold_available = capacity / 100 * ShenandoahMinFreeThreshold;
  47 
  48   if (available < threshold_available) {
  49     log_info(gc)("Trigger: Free (" SIZE_FORMAT "%s) is below minimum threshold (" SIZE_FORMAT "%s)",
  50                  byte_size_in_proper_unit(available),           proper_unit_for_byte_size(available),
  51                  byte_size_in_proper_unit(threshold_available), proper_unit_for_byte_size(threshold_available));
  52     return true;
  53   }
  54   return ShenandoahHeuristics::should_start_gc();
  55 }
  56 


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