src/share/vm/gc/g1/g1CollectorPolicy.cpp

rev 9312 : imported patch 8136678-implement-adaptive-sizing-algorithm-for-IHOP

@@ -1243,12 +1243,29 @@
 
   _collectionSetChooser->verify();
 }
 
 G1IHOPControl* G1CollectorPolicy::create_ihop_control() const {
+  if (G1UseAdaptiveIHOP) {
+    // The target occupancy is the total heap occupancy we want to hit. First, we
+    // want to avoid eating into the reserve intended for young GC (to avoid unnecessary
+    // throughput loss). Additionally G1 is free to not clean out up to
+    // G1HeapWastePercent of heap, that space also cannot be used for allocation
+    // while marking.
+    size_t safe_heap_percentage = (size_t) (G1ReservePercent + G1HeapWastePercent);
+    size_t target_occupancy = 0;
+
+    if (safe_heap_percentage < 100) {
+      target_occupancy = G1CollectedHeap::heap()->max_capacity() * (100.0 - safe_heap_percentage) / 100.0;
+    }
+    return new G1AdaptiveIHOPControl(InitiatingHeapOccupancyPercent,
+                                     target_occupancy,
+                                     &_predictor);
+  } else {
   return new G1StaticIHOPControl(InitiatingHeapOccupancyPercent,
                                  G1CollectedHeap::heap()->max_capacity());
+  }
 }
 
 void G1CollectorPolicy::update_ihop_statistics(double marking_time,
                                                double mutator_time_s,
                                                size_t mutator_alloc_bytes,