[heap] Parallel newspace evacuation, semispace copy, and compaction \o/

src/heap/store-buffer.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_STORE_BUFFER_H_
 #define V8_STORE_BUFFER_H_
 
 #include "src/allocation.h"
 #include "src/base/logging.h"
 #include "src/base/platform/platform.h"
@@ skipping 198 matching lines @@
   }
 
   ~DontMoveStoreBufferEntriesScope() {
     store_buffer_->may_move_store_buffer_entries_ = stored_state_;
   }
 
  private:
   StoreBuffer* store_buffer_;
   bool stored_state_;
 };
+
+
+class LocalStoreBuffer BASE_EMBEDDED {
+ public:
+  LocalStoreBuffer() : top_(new Node(nullptr)) {}
+
+  ~LocalStoreBuffer() {
+    Node* current = top_;
+    while (current != nullptr) {
+      Node* tmp = current->next;
+      delete current;
+      current = tmp;
+    }
+  }
+
+  inline void Record(Address addr);
+  inline void Process(StoreBuffer* store_buffer);
+
+ private:
+  static const int kBufferSize = 16 * KB;

[Michael Lippautz, 2016/01/14 19:51:55]

Profiled using v8.infinite_scroll.

+
+  struct Node : Malloced {
+    explicit Node(Node* next_node) : next(next_node), count(0) {}
+
+    inline bool is_full() { return count == kBufferSize; }
+
+    Node* next;
+    Address buffer[kBufferSize];
+    int count;
+  };
+
+  Node* top_;
+};
+
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_STORE_BUFFER_H_