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

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

*** 116,125 ****
--- 116,127 ----
    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);
*** 166,175 ****
--- 168,178 ----
                     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,
*** 209,218 ****
--- 212,224 ----
    }
  
    // 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(),