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

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  26 
  27 #include "gc/shenandoah/heuristics/shenandoahAggressiveHeuristics.hpp"
  28 #include "gc/shenandoah/shenandoahCollectionSet.hpp"
  29 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
  30 #include "logging/log.hpp"
  31 #include "logging/logTag.hpp"
  32 #include "runtime/os.hpp"
  33 
  34 ShenandoahAggressiveHeuristics::ShenandoahAggressiveHeuristics() : ShenandoahHeuristics() {
  35   // Do not shortcut evacuation
  36   SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahImmediateThreshold, 100);
  37 
  38   // Aggressive evacuates everything, so it needs as much evac space as it can get
  39   SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahEvacReserveOverflow);
  40 
  41   // If class unloading is globally enabled, aggressive does unloading even with
  42   // concurrent cycles.
  43   if (ClassUnloading) {
  44     SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahUnloadClassesFrequency, 1);
  45   }
  46 
  47   // Final configuration checks
  48   SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier);
  49   SHENANDOAH_CHECK_FLAG_SET(ShenandoahSATBBarrier);
  50   SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier);
  51   SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier);
  52 }
  53 
  54 void ShenandoahAggressiveHeuristics::choose_collection_set_from_regiondata(ShenandoahCollectionSet* cset,
  55                                                                            RegionData* data, size_t size,
  56                                                                            size_t free) {
  57   for (size_t idx = 0; idx < size; idx++) {
  58     ShenandoahHeapRegion* r = data[idx]._region;
  59     if (r->garbage() > 0) {
  60       cset->add_region(r);
  61     }
  62   }
  63 }
  64 
  65 bool ShenandoahAggressiveHeuristics::should_start_gc() const {
  66   log_info(gc)("Trigger: Start next cycle immediately");
  67   return true;
  68 }
  69 
  70 bool ShenandoahAggressiveHeuristics::should_process_references() {
  71   if (!can_process_references()) return false;




  26 
  27 #include "gc/shenandoah/heuristics/shenandoahAggressiveHeuristics.hpp"
  28 #include "gc/shenandoah/shenandoahCollectionSet.hpp"
  29 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
  30 #include "logging/log.hpp"
  31 #include "logging/logTag.hpp"
  32 #include "runtime/os.hpp"
  33 
  34 ShenandoahAggressiveHeuristics::ShenandoahAggressiveHeuristics() : ShenandoahHeuristics() {
  35   // Do not shortcut evacuation
  36   SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahImmediateThreshold, 100);
  37 
  38   // Aggressive evacuates everything, so it needs as much evac space as it can get
  39   SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahEvacReserveOverflow);
  40 
  41   // If class unloading is globally enabled, aggressive does unloading even with
  42   // concurrent cycles.
  43   if (ClassUnloading) {
  44     SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahUnloadClassesFrequency, 1);
  45   }






  46 }
  47 
  48 void ShenandoahAggressiveHeuristics::choose_collection_set_from_regiondata(ShenandoahCollectionSet* cset,
  49                                                                            RegionData* data, size_t size,
  50                                                                            size_t free) {
  51   for (size_t idx = 0; idx < size; idx++) {
  52     ShenandoahHeapRegion* r = data[idx]._region;
  53     if (r->garbage() > 0) {
  54       cset->add_region(r);
  55     }
  56   }
  57 }
  58 
  59 bool ShenandoahAggressiveHeuristics::should_start_gc() const {
  60   log_info(gc)("Trigger: Start next cycle immediately");
  61   return true;
  62 }
  63 
  64 bool ShenandoahAggressiveHeuristics::should_process_references() {
  65   if (!can_process_references()) return false;


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