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src/hotspot/share/gc/shenandoah/shenandoahPassiveMode.cpp

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rev 58558 : 8241605: Shenandoah: More aggressive reference discovery


  27 #include "gc/shenandoah/heuristics/shenandoahPassiveHeuristics.hpp"
  28 #include "logging/log.hpp"
  29 #include "logging/logTag.hpp"
  30 
  31 void ShenandoahPassiveMode::initialize_flags() const {
  32   // Do not allow concurrent cycles.
  33   FLAG_SET_DEFAULT(ExplicitGCInvokesConcurrent, false);
  34   FLAG_SET_DEFAULT(ShenandoahImplicitGCInvokesConcurrent, false);
  35 
  36   // Passive runs with max speed for allocation, because GC is always STW
  37   SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahPacing);
  38 
  39   // No need for evacuation reserve with Full GC, only for Degenerated GC.
  40   if (!ShenandoahDegeneratedGC) {
  41     SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahEvacReserve, 0);
  42   }
  43 
  44   // Disable known barriers by default.
  45   SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahLoadRefBarrier);
  46   SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahSATBBarrier);
  47   SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahKeepAliveBarrier);
  48   SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahStoreValEnqueueBarrier);
  49   SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCASBarrier);
  50   SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCloneBarrier);
  51 
  52   // Final configuration checks
  53   // No barriers are required to run.
  54 }
  55 ShenandoahHeuristics* ShenandoahPassiveMode::initialize_heuristics() const {
  56   if (ShenandoahGCHeuristics != NULL) {
  57     return new ShenandoahPassiveHeuristics();
  58   }
  59   ShouldNotReachHere();
  60   return NULL;
  61 }


  27 #include "gc/shenandoah/heuristics/shenandoahPassiveHeuristics.hpp"
  28 #include "logging/log.hpp"
  29 #include "logging/logTag.hpp"
  30 
  31 void ShenandoahPassiveMode::initialize_flags() const {
  32   // Do not allow concurrent cycles.
  33   FLAG_SET_DEFAULT(ExplicitGCInvokesConcurrent, false);
  34   FLAG_SET_DEFAULT(ShenandoahImplicitGCInvokesConcurrent, false);
  35 
  36   // Passive runs with max speed for allocation, because GC is always STW
  37   SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahPacing);
  38 
  39   // No need for evacuation reserve with Full GC, only for Degenerated GC.
  40   if (!ShenandoahDegeneratedGC) {
  41     SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahEvacReserve, 0);
  42   }
  43 
  44   // Disable known barriers by default.
  45   SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahLoadRefBarrier);
  46   SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahSATBBarrier);

  47   SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahStoreValEnqueueBarrier);
  48   SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCASBarrier);
  49   SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCloneBarrier);
  50 
  51   // Final configuration checks
  52   // No barriers are required to run.
  53 }
  54 ShenandoahHeuristics* ShenandoahPassiveMode::initialize_heuristics() const {
  55   if (ShenandoahGCHeuristics != NULL) {
  56     return new ShenandoahPassiveHeuristics();
  57   }
  58   ShouldNotReachHere();
  59   return NULL;
  60 }
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