src/cpu/x86/vm/macroAssembler_x86.cpp

@@ -5598,10 +5598,14 @@
   movptr(Address(thread_reg, in_bytes(JavaThread::tlab_top_offset())), top);
   addptr(top, t1);
   subptr(top, (int32_t)ThreadLocalAllocBuffer::alignment_reserve_in_bytes());
   movptr(Address(thread_reg, in_bytes(JavaThread::tlab_end_offset())), top);
 
+  // Currently, if this happens, just set back the actual end to where it was.
+  // We miss a chance to sample here but it is a TODO.
+  movptr(Address(thread_reg, in_bytes(JavaThread::tlab_actual_end_offset())), top);
+
   if (ZeroTLAB) {
     // This is a fast TLAB refill, therefore the GC is not notified of it.
     // So compiled code must fill the new TLAB with zeroes.
     movptr(top, Address(thread_reg, in_bytes(JavaThread::tlab_start_offset())));
     zero_memory(top, t1, 0, t2);