src/hotspot/share/gc/g1/g1ParScanThreadState.cpp

@@ -66,13 +66,15 @@
  {
    // We allocate number of young gen regions in the collection set plus one
    // entries, since entry 0 keeps track of surviving bytes for non-young regions.
    // We also add a few elements at the beginning and at the end in
    // an attempt to eliminate cache contention
-   size_t array_length = PADDING_ELEM_NUM + _surviving_words_length + PADDING_ELEM_NUM;
+   const size_t padding_elem_num = (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t));
+   size_t array_length = padding_elem_num + _surviving_words_length + padding_elem_num;
+ 
    _surviving_young_words_base = NEW_C_HEAP_ARRAY(size_t, array_length, mtGC);
-   _surviving_young_words = _surviving_young_words_base + PADDING_ELEM_NUM;
+   _surviving_young_words = _surviving_young_words_base + padding_elem_num;
    memset(_surviving_young_words, 0, _surviving_words_length * sizeof(size_t));
  
    _plab_allocator = new G1PLABAllocator(_g1h->allocator());
  
    // The dest for Young is used when the objects are aged enough to