Implement committed physical memory stats for Linux.

include/v8.h

 // 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 2748 matching lines @@
  * Collection of V8 heap information.
  *
  * Instances of this class can be passed to v8::V8::HeapStatistics to
  * get heap statistics from V8.
  */
 class V8EXPORT HeapStatistics {
  public:
   HeapStatistics();
   size_t total_heap_size() { return total_heap_size_; }
   size_t total_heap_size_executable() { return total_heap_size_executable_; }
+  size_t total_physical_size() { return total_physical_size_; }
   size_t used_heap_size() { return used_heap_size_; }
   size_t heap_size_limit() { return heap_size_limit_; }
 
  private:
   void set_total_heap_size(size_t size) { total_heap_size_ = size; }
   void set_total_heap_size_executable(size_t size) {
     total_heap_size_executable_ = size;
   }
+  void set_total_physical_size(size_t size) {
+    total_physical_size_ = size;
+  }
   void set_used_heap_size(size_t size) { used_heap_size_ = size; }
   void set_heap_size_limit(size_t size) { heap_size_limit_ = size; }
 
   size_t total_heap_size_;
   size_t total_heap_size_executable_;
+  size_t total_physical_size_;
   size_t used_heap_size_;
   size_t heap_size_limit_;
 
   friend class V8;
 };
 
 
 class RetainedObjectInfo;
 
 /**
@@ skipping 1862 matching lines @@
 
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_