Implement committed physical memory stats for Linux.

src/spaces.cc

Index: src/spaces.cc
diff --git a/src/spaces.cc b/src/spaces.cc
index ce62877dfab6d9a97af317430c5e750939046db3..e9885f4d854d79a30fa0d08f0ac4cb073b42d03c 100644
--- a/src/spaces.cc
+++ b/src/spaces.cc
@@ -487,6 +487,18 @@ void MemoryChunk::Unlink() {
 }
 
 
+size_t MemoryChunk::CommittedPhysicalMemory() {
+  size_t physical;
+  size_t size = area_size();
+  if (VirtualMemory::CommittedPhysicalSizeInRegion(
+          area_start_, size, &physical)) {
+    return physical;
+  } else {
+    return size;
+  }
+}
+
+
 MemoryChunk* MemoryAllocator::AllocateChunk(intptr_t body_size,
                                             Executability executable,
                                             Space* owner) {
@@ -819,6 +831,16 @@ void PagedSpace::TearDown() {
 }
 
 
+size_t PagedSpace::CommittedPhysicalMemory() {
+  size_t size = 0;
+  PageIterator it(this);
+  while (it.has_next()) {
+    size += it.next()->CommittedPhysicalMemory();
+  }
+  return size;
+}
+
+
 MaybeObject* PagedSpace::FindObject(Address addr) {
   // Note: this function can only be called on precisely swept spaces.
   ASSERT(!heap()->mark_compact_collector()->in_use());
@@ -1384,6 +1406,17 @@ bool SemiSpace::Uncommit() {
 }
 
 
+size_t SemiSpace::CommittedPhysicalMemory() {
+  if (!is_committed()) return 0;
+  size_t size = 0;
+  NewSpacePageIterator it(this);
+  while (it.has_next()) {
+    size += it.next()->CommittedPhysicalMemory();
+  }
+  return size;
+}
+
+
 bool SemiSpace::GrowTo(int new_capacity) {
   if (!is_committed()) {
     if (!Commit()) return false;
@@ -2690,6 +2723,17 @@ MaybeObject* LargeObjectSpace::AllocateRaw(int object_size,
 }
 
 
+size_t LargeObjectSpace::CommittedPhysicalMemory() {
+  size_t size = 0;
+  LargePage* current = first_page_;
+  while (current != NULL) {
+    size += current->CommittedPhysicalMemory();
+    current = current->next_page();
+  }
+  return size;
+}
+
+
 // GC support
 MaybeObject* LargeObjectSpace::FindObject(Address a) {
   LargePage* page = FindPage(a);