src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp

@@ -627,11 +627,11 @@
   Atomic::release_store_fence(&_used, bytes);
 }
 
 void ShenandoahHeap::decrease_used(size_t bytes) {
   assert(used() >= bytes, "never decrease heap size by more than we've left");
-  Atomic::sub(bytes, &_used);
+  Atomic::sub(&_used, bytes);
 }
 
 void ShenandoahHeap::increase_allocated(size_t bytes) {
   Atomic::add(&_bytes_allocated_since_gc_start, bytes);
 }