Reset growth control state after isolate initialization.

runtime/vm/pages.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_PAGES_H_
 #define VM_PAGES_H_
 
 #include "vm/freelist.h"
 #include "vm/globals.h"
 #include "vm/spaces.h"
@@ skipping 118 matching lines @@
   // the heap will grow.
   void EvaluateGarbageCollection(SpaceUsage before,
                                  SpaceUsage after,
                                  int64_t start, int64_t end);
 
   int64_t last_code_collection_in_us() { return last_code_collection_in_us_; }
   void set_last_code_collection_in_us(int64_t t) {
     last_code_collection_in_us_ = t;
   }
 
-  void set_is_enabled(bool state) {
-    is_enabled_ = state;
+  void Enable(SpaceUsage current) {
+    last_usage_ = current;
+    is_enabled_ = true;
+  }
+  void Disable() {
+    is_enabled_ = false;
   }
   bool is_enabled() {
     return is_enabled_;
   }
 
  private:
   bool is_enabled_;
 
-  // Usage after last evaluated GC.
+  // Usage after last evaluated GC or last enabled.
   SpaceUsage last_usage_;
 
-  // Heap growth control variable.
+  // Pages of capacity growth allowed before next GC is advised.
   intptr_t grow_heap_;
 
   // If the garbage collector was not able to free more than heap_growth_ratio_
   // memory, then the heap is grown. Otherwise garbage collection is performed.
   int heap_growth_ratio_;
 
   // The desired percent of heap in-use after a garbage collection.
   // Equivalent to \frac{100-heap_growth_ratio_}{100}.
   double desired_utilization_;
 
@@ skipping 57 matching lines @@
   // Checks if enough time has elapsed since the last attempt to collect
   // code.
   bool ShouldCollectCode();
 
   // Collect the garbage in the page space using mark-sweep.
   void MarkSweep(bool invoke_api_callbacks);
 
   void StartEndAddress(uword* start, uword* end) const;
 
   void SetGrowthControlState(bool state) {
-    page_space_controller_.set_is_enabled(state);
+    if (state) {
+      page_space_controller_.Enable(usage_);
+    } else {
+      page_space_controller_.Disable();
+    }
   }
 
   bool GrowthControlState() {
     return page_space_controller_.is_enabled();
   }
 
   bool NeedExternalGC() {
     return UsedInWords() + ExternalInWords() > max_capacity_in_words_;
   }
 
@@ skipping 72 matching lines @@
   intptr_t collections_;
 
   friend class PageSpaceController;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PageSpace);
 };
 
 }  // namespace dart
 
 #endif  // VM_PAGES_H_