PartitionAlloc: Count direct mapped pages as committed

Source/wtf/PartitionAlloc.cpp

Index: Source/wtf/PartitionAlloc.cpp
diff --git a/Source/wtf/PartitionAlloc.cpp b/Source/wtf/PartitionAlloc.cpp
index 3ba965297d9ba85cbd9dd873a8778b2de68e049e..8ad6d617d30cf51d52ad38f97b3a1778b1b16d71 100644
--- a/Source/wtf/PartitionAlloc.cpp
+++ b/Source/wtf/PartitionAlloc.cpp
@@ -578,6 +578,8 @@ static ALWAYS_INLINE void* partitionDirectMap(PartitionRootBase* root, int flags
     mapSize += kPageAllocationGranularityOffsetMask;
     mapSize &= kPageAllocationGranularityBaseMask;
 
+    root->totalSizeOfCommittedPages += size + kSystemPageSize;
+
     // TODO: we may want to let the operating system place these allocations
     // where it pleases. On 32-bit, this might limit address space
     // fragmentation and on 64-bit, this might have useful savings for TLB
@@ -634,6 +636,9 @@ static ALWAYS_INLINE void partitionDirectUnmap(PartitionPage* page)
     // page.
     unmapSize += kPartitionPageSize + kSystemPageSize;
 
+    PartitionRootBase* root = partitionPageToRoot(page);
+    root->totalSizeOfCommittedPages -= page->bucket->slotSize + kSystemPageSize;
+
     ASSERT(!(unmapSize & kPageAllocationGranularityOffsetMask));
 
     char* ptr = reinterpret_cast<char*>(partitionPageToPointer(page));