src/hotspot/share/gc/epsilon/epsilonHeap.cpp

rev 52077 : 8212005: Epsilon elastic TLAB sizing may cause misalignment
Reviewed-by: XXX

@@ -116,10 +116,12 @@
   assert(heap->kind() == CollectedHeap::Epsilon, "Not an Epsilon heap");
   return (EpsilonHeap*)heap;
 }
 
 HeapWord* EpsilonHeap::allocate_work(size_t size) {
+  assert(is_object_aligned(size), "Allocation size should be aligned: " SIZE_FORMAT, size);
+
   HeapWord* res = _space->par_allocate(size);
 
   while (res == NULL) {
     // Allocation failed, attempt expansion, and retry:
     MutexLockerEx ml(Heap_lock);

@@ -166,10 +168,11 @@
                    used / M,
                    used * 100.0 / max_capacity());
     }
   }
 
+  assert(is_object_aligned(res), "Object should be aligned: " PTR_FORMAT, p2i(res));
   return res;
 }
 
 HeapWord* EpsilonHeap::allocate_new_tlab(size_t min_size,
                                          size_t requested_size,

@@ -209,10 +212,13 @@
   }
 
   // Always honor boundaries
   size = MAX2(min_size, MIN2(_max_tlab_size, size));
 
+  // Always honor alignment
+  size = align_up(size, MinObjAlignment);
+
   if (log_is_enabled(Trace, gc)) {
     ResourceMark rm;
     log_trace(gc)("TLAB size for \"%s\" (Requested: " SIZE_FORMAT "K, Min: " SIZE_FORMAT
                           "K, Max: " SIZE_FORMAT "K, Ergo: " SIZE_FORMAT "K) -> " SIZE_FORMAT "K",
                   thread->name(),