1 files changed, 5 insertions, 0 deletions
diff --git a/compiler-rt/lib/xray/xray_buffer_queue.h b/compiler-rt/lib/xray/xray_buffer_queue.h
index 9257657a32b..1ceb5827461 100644
--- a/compiler-rt/lib/xray/xray_buffer_queue.h
+++ b/compiler-rt/lib/xray/xray_buffer_queue.h
@@ -28,9 +28,14 @@ namespace __xray {
 /// trace collection.
 class BufferQueue {
  public:
+  struct alignas(64) BufferExtents {
+    __sanitizer::atomic_uint64_t Size;
+  };
+
   struct Buffer {
     void *Buffer = nullptr;
     size_t Size = 0;
+    BufferExtents* Extents;
   };
 
  private: