Made zone segments aligned in memory and included a pointer to the zone in the header. Larger objec…

src/base/accounting-allocator.cc

Index: src/base/accounting-allocator.cc
diff --git a/src/base/accounting-allocator.cc b/src/base/accounting-allocator.cc
index c56f037c04c00a9e6ec97976a6b0fb614e7cd091..7313209577a0921e537746e991d789374dcb00a6 100644
--- a/src/base/accounting-allocator.cc
+++ b/src/base/accounting-allocator.cc
@@ -16,20 +16,24 @@ namespace base {
 void* AccountingAllocator::Allocate(size_t bytes) {
   void* memory = malloc(bytes);
   if (memory) {
-    AtomicWord current =
-        NoBarrier_AtomicIncrement(&current_memory_usage_, bytes);
-    AtomicWord max = NoBarrier_Load(&max_memory_usage_);
-    while (current > max) {
-      max = NoBarrier_CompareAndSwap(&max_memory_usage_, max, current);
-    }
+    ChangeCurrentMemoryUsage(bytes);
   }
   return memory;
 }
 
 void AccountingAllocator::Free(void* memory, size_t bytes) {
   free(memory);
-  NoBarrier_AtomicIncrement(&current_memory_usage_,
-                            -static_cast<AtomicWord>(bytes));
+  ChangeCurrentMemoryUsage(-static_cast<int64_t>(bytes));
+}
+
+void AccountingAllocator::ChangeCurrentMemoryUsage(const int64_t bytes) {
+  AtomicWord current = NoBarrier_AtomicIncrement(&current_memory_usage_, bytes);
+  AtomicWord max = NoBarrier_Load(&max_memory_usage_);
+  if (bytes > 0) {
+    while (current > max) {
+      max = NoBarrier_CompareAndSwap(&max_memory_usage_, max, current);
+    }
+  }
 }
 
 size_t AccountingAllocator::GetCurrentMemoryUsage() const {