< prev index next >

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

Print this page
rev 59422 : 8245754: Shenandoah: ditch ShenandoahAlwaysPreTouch
Reviewed-by: XXX


 126       FLAG_SET_DEFAULT(LoopStripMiningIter, 1000);
 127     }
 128   }
 129 #ifdef ASSERT
 130   // C2 barrier verification is only reliable when all default barriers are enabled
 131   if (ShenandoahVerifyOptoBarriers &&
 132           (!FLAG_IS_DEFAULT(ShenandoahSATBBarrier)            ||
 133            !FLAG_IS_DEFAULT(ShenandoahLoadRefBarrier)         ||
 134            !FLAG_IS_DEFAULT(ShenandoahStoreValEnqueueBarrier) ||
 135            !FLAG_IS_DEFAULT(ShenandoahCASBarrier)             ||
 136            !FLAG_IS_DEFAULT(ShenandoahCloneBarrier)
 137           )) {
 138     warning("Unusual barrier configuration, disabling C2 barrier verification");
 139     FLAG_SET_DEFAULT(ShenandoahVerifyOptoBarriers, false);
 140   }
 141 #else
 142   guarantee(!ShenandoahVerifyOptoBarriers, "Should be disabled");
 143 #endif // ASSERT
 144 #endif // COMPILER2
 145 
 146   if (AlwaysPreTouch) {
 147     // Shenandoah handles pre-touch on its own. It does not let the
 148     // generic storage code to do the pre-touch before Shenandoah has
 149     // a chance to do it on its own.
 150     FLAG_SET_DEFAULT(AlwaysPreTouch, false);
 151     FLAG_SET_DEFAULT(ShenandoahAlwaysPreTouch, true);
 152   }
 153 
 154   // Record more information about previous cycles for improved debugging pleasure
 155   if (FLAG_IS_DEFAULT(LogEventsBufferEntries)) {
 156     FLAG_SET_DEFAULT(LogEventsBufferEntries, 250);
 157   }
 158 
 159   if (ShenandoahAlwaysPreTouch) {
 160     if (!FLAG_IS_DEFAULT(ShenandoahUncommit)) {
 161       warning("AlwaysPreTouch is enabled, disabling ShenandoahUncommit");
 162     }
 163     FLAG_SET_DEFAULT(ShenandoahUncommit, false);
 164   }
 165 
 166   if ((InitialHeapSize == MaxHeapSize) && ShenandoahUncommit) {
 167     log_info(gc)("Min heap equals to max heap, disabling ShenandoahUncommit");
 168     FLAG_SET_DEFAULT(ShenandoahUncommit, false);
 169   }
 170 
 171   // If class unloading is disabled, no unloading for concurrent cycles as well.
 172   if (!ClassUnloading) {
 173     FLAG_SET_DEFAULT(ClassUnloadingWithConcurrentMark, false);
 174   }
 175 
 176   // AOT is not supported yet
 177   if (UseAOT) {
 178     if (!FLAG_IS_DEFAULT(UseAOT)) {
 179       warning("Shenandoah does not support AOT at this moment, disabling UseAOT");




 126       FLAG_SET_DEFAULT(LoopStripMiningIter, 1000);
 127     }
 128   }
 129 #ifdef ASSERT
 130   // C2 barrier verification is only reliable when all default barriers are enabled
 131   if (ShenandoahVerifyOptoBarriers &&
 132           (!FLAG_IS_DEFAULT(ShenandoahSATBBarrier)            ||
 133            !FLAG_IS_DEFAULT(ShenandoahLoadRefBarrier)         ||
 134            !FLAG_IS_DEFAULT(ShenandoahStoreValEnqueueBarrier) ||
 135            !FLAG_IS_DEFAULT(ShenandoahCASBarrier)             ||
 136            !FLAG_IS_DEFAULT(ShenandoahCloneBarrier)
 137           )) {
 138     warning("Unusual barrier configuration, disabling C2 barrier verification");
 139     FLAG_SET_DEFAULT(ShenandoahVerifyOptoBarriers, false);
 140   }
 141 #else
 142   guarantee(!ShenandoahVerifyOptoBarriers, "Should be disabled");
 143 #endif // ASSERT
 144 #endif // COMPILER2
 145 








 146   // Record more information about previous cycles for improved debugging pleasure
 147   if (FLAG_IS_DEFAULT(LogEventsBufferEntries)) {
 148     FLAG_SET_DEFAULT(LogEventsBufferEntries, 250);
 149   }
 150 
 151   if (AlwaysPreTouch) {
 152     if (!FLAG_IS_DEFAULT(ShenandoahUncommit)) {
 153       warning("AlwaysPreTouch is enabled, disabling ShenandoahUncommit");
 154     }
 155     FLAG_SET_DEFAULT(ShenandoahUncommit, false);
 156   }
 157 
 158   if ((InitialHeapSize == MaxHeapSize) && ShenandoahUncommit) {
 159     log_info(gc)("Min heap equals to max heap, disabling ShenandoahUncommit");
 160     FLAG_SET_DEFAULT(ShenandoahUncommit, false);
 161   }
 162 
 163   // If class unloading is disabled, no unloading for concurrent cycles as well.
 164   if (!ClassUnloading) {
 165     FLAG_SET_DEFAULT(ClassUnloadingWithConcurrentMark, false);
 166   }
 167 
 168   // AOT is not supported yet
 169   if (UseAOT) {
 170     if (!FLAG_IS_DEFAULT(UseAOT)) {
 171       warning("Shenandoah does not support AOT at this moment, disabling UseAOT");


< prev index next >