Distinct block sizes for StoreBuffer/MarkingStack.

runtime/vm/scavenger.cc

 // 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.
 
 #include "vm/scavenger.h"
 
 #include <algorithm>
 #include <map>
 #include <utility>
 
@@ skipping 508 matching lines @@
     intptr_t count = pending->Count();
     total_count += count;
     while (!pending->IsEmpty()) {
       RawObject* raw_object = pending->Pop();
       ASSERT(raw_object->IsRemembered());
       raw_object->ClearRememberedBit();
       visitor->VisitingOldObject(raw_object);
       raw_object->VisitPointers(visitor);
     }
     pending->Reset();
-    isolate->store_buffer()->PushBlock(pending);
+    // Return the emptied block for recycling (no need to check threshold).
+    isolate->store_buffer()->PushBlock(pending, StoreBuffer::kIgnoreThreshold);
     pending = next;
   }
   heap_->RecordData(kStoreBufferEntries, total_count);
   heap_->RecordData(kDataUnused1, 0);
   heap_->RecordData(kDataUnused2, 0);
   // Done iterating through old objects remembered in the store buffers.
   visitor->VisitingOldObject(NULL);
 }
 
 
@@ skipping 373 matching lines @@
 }
 
 
 void Scavenger::FreeExternal(intptr_t size) {
   ASSERT(size >= 0);
   external_size_ -= size;
   ASSERT(external_size_ >= 0);
 }
 
 }  // namespace dart