src/hotspot/share/gc/g1/g1Arguments.cpp

rev 49680 : imported patch 6672778-partial-queue-trimming
rev 49681 : [mq]: 6672778-refactoring

@@ -124,10 +124,15 @@
     FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
   }
 
   log_trace(gc)("MarkStackSize: %uk  MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
 
+  // By default do not let the target stack size to be more than 1/4 of the entries
+  if (FLAG_IS_DEFAULT(GCDrainStackTargetSize)) {
+    FLAG_SET_ERGO(uintx, GCDrainStackTargetSize, MIN2(GCDrainStackTargetSize, (uintx)TASKQUEUE_SIZE / 4));
+  }
+
 #ifdef COMPILER2
   // Enable loop strip mining to offer better pause time guarantees
   if (FLAG_IS_DEFAULT(UseCountedLoopSafepoints)) {
     FLAG_SET_DEFAULT(UseCountedLoopSafepoints, true);
     if (FLAG_IS_DEFAULT(LoopStripMiningIter)) {