Fix incremental marking speed accelleration and start incremental marking when old space is almost …

src/incremental-marking.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 842 matching lines @@
   set_should_hurry(true);
   if (FLAG_trace_incremental_marking) {
     PrintF("[IncrementalMarking] Complete (normal).\n");
   }
   if (action == GC_VIA_STACK_GUARD) {
     heap_->isolate()->stack_guard()->RequestGC();
   }
 }
 
 
+void IncrementalMarking::OldSpaceStep(intptr_t allocated) {
+  if (IsStopped() && WorthActivating() && heap_->NextGCIsLikelyToBeFull()) {
+    Start();
+  } else {
+    Step(allocated * kFastMarking / kInitialMarkingSpeed, GC_VIA_STACK_GUARD);
+  }
+}
+
+
 void IncrementalMarking::Step(intptr_t allocated_bytes,
                               CompletionAction action) {
   if (heap_->gc_state() != Heap::NOT_IN_GC ||
       !FLAG_incremental_marking ||
       !FLAG_incremental_marking_steps ||
       (state_ != SWEEPING && state_ != MARKING)) {
     return;
   }
 
   allocated_ += allocated_bytes;
@@ skipping 85 matching lines @@
     }
     speed_up = true;
   }
 
   if (speed_up) {
     if (state_ != MARKING) {
       if (FLAG_trace_gc) {
         PrintPID("Postponing speeding up marking until marking starts\n");
       }
     } else {
-      marking_speed_ += kMarkingSpeedAccellerationInterval;
+      marking_speed_ += kMarkingSpeedAccelleration;
       marking_speed_ = static_cast<int>(
           Min(kMaxMarkingSpeed,
               static_cast<intptr_t>(marking_speed_ * 1.3)));
       if (FLAG_trace_gc) {
         PrintPID("Marking speed increased to %d\n", marking_speed_);
       }
     }
   }
 
   if (FLAG_trace_incremental_marking || FLAG_trace_gc ||
@@ skipping 23 matching lines @@
   bytes_scanned_ = 0;
   write_barriers_invoked_since_last_step_ = 0;
 }
 
 
 int64_t IncrementalMarking::SpaceLeftInOldSpace() {
   return heap_->MaxOldGenerationSize() - heap_->PromotedSpaceSizeOfObjects();
 }
 
 } }  // namespace v8::internal