Implement committed physical memory stats for Linux.

src/api.cc

 // 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 4288 matching lines @@
                 "Use v8::Isolate::Dispose() for a non-default isolate.")) {
     return false;
   }
   i::V8::TearDown();
   return true;
 }
 
 
 HeapStatistics::HeapStatistics(): total_heap_size_(0),
                                   total_heap_size_executable_(0),
+                                  committed_physical_size_(0),
                                   used_heap_size_(0),
                                   heap_size_limit_(0) { }
 
 
 void v8::V8::GetHeapStatistics(HeapStatistics* heap_statistics) {
   if (!i::Isolate::Current()->IsInitialized()) {
     // Isolate is unitialized thus heap is not configured yet.
     heap_statistics->set_total_heap_size(0);
     heap_statistics->set_total_heap_size_executable(0);
+    heap_statistics->set_committed_physical_size(0);
     heap_statistics->set_used_heap_size(0);
     heap_statistics->set_heap_size_limit(0);
     return;
   }
 
   i::Heap* heap = i::Isolate::Current()->heap();
   heap_statistics->set_total_heap_size(heap->CommittedMemory());
   heap_statistics->set_total_heap_size_executable(
       heap->CommittedMemoryExecutable());
+  heap_statistics->set_committed_physical_size(heap->CommittedPhysicalMemory());
   heap_statistics->set_used_heap_size(heap->SizeOfObjects());
   heap_statistics->set_heap_size_limit(heap->MaxReserved());
 }
 
 
 void v8::V8::VisitExternalResources(ExternalResourceVisitor* visitor) {
   i::Isolate* isolate = i::Isolate::Current();
   IsDeadCheck(isolate, "v8::V8::VisitExternalResources");
   isolate->heap()->VisitExternalResources(visitor);
 }
@@ skipping 2253 matching lines @@
 
   v->VisitPointers(blocks_.first(), first_block_limit_);
 
   for (int i = 1; i < blocks_.length(); i++) {
     v->VisitPointers(blocks_[i], &blocks_[i][kHandleBlockSize]);
   }
 }
 
 
 } }  // namespace v8::internal