Use smaller heap growing factor in idle notification to start incremental marking when there is idl…

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 574481bd39326828eee08412d45d41a3900024cd..0364a8e16fac6d213016ad95692e3775fcf406c5 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -634,6 +634,10 @@ class Heap {
   // Returns of size of all objects residing in the heap.
   intptr_t SizeOfObjects();
 
+  intptr_t old_generation_allocation_limit() const {
+    return old_generation_allocation_limit_;
+  }
+
   // Return the starting address and a mask for the new space.  And-masking an
   // address with the mask will result in the start address of the new space
   // for all addresses in either semispace.
@@ -1120,8 +1124,14 @@ class Heap {
   static const int kMaxExecutableSizeHugeMemoryDevice =
       256 * kPointerMultiplier;
 
-  intptr_t OldGenerationAllocationLimit(intptr_t old_gen_size,
-                                        int freed_global_handles);
+  // Calculates the allocation limit based on a given growing factor and a
+  // given old generation size.
+  intptr_t CalculateOldGenerationAllocationLimit(double factor,
+                                                 intptr_t old_gen_size);
+
+  // Sets the allocation limit to trigger the next full garbage collection.
+  void SetOldGenerationAllocationLimit(intptr_t old_gen_size,
+                                       int freed_global_handles);
 
   // Indicates whether inline bump-pointer allocation has been disabled.
   bool inline_allocation_disabled() { return inline_allocation_disabled_; }
@@ -1227,13 +1237,12 @@ class Heap {
     survived_since_last_expansion_ += survived;
   }
 
-  inline bool NextGCIsLikelyToBeFull() {
+  inline bool NextGCIsLikelyToBeFull(intptr_t limit) {
     if (FLAG_gc_global) return true;
 
     if (FLAG_stress_compaction && (gc_count_ & 1) != 0) return true;
 
-    intptr_t adjusted_allocation_limit =
-        old_generation_allocation_limit_ - new_space_.Capacity();
+    intptr_t adjusted_allocation_limit = limit - new_space_.Capacity();
 
     if (PromotedTotalSize() >= adjusted_allocation_limit) return true;
 
@@ -1636,6 +1645,10 @@ class Heap {
   // generation and on every allocation in large object space.
   intptr_t old_generation_allocation_limit_;
 
+  // The allocation limit when there is >16.66ms idle time in the idle time
+  // handler.
+  intptr_t idle_old_generation_allocation_limit_;
+
   // Indicates that an allocation has failed in the old generation since the
   // last GC.
   bool old_gen_exhausted_;