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diff src/share/vm/memory/padded.inline.hpp @ 17760:5479cb006184

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8036860: Pad and cache-align the BiasedMappedArray Summary: Pad and cache-align BiasedMappedArray instances by default to avoid performance variability problems due to false sharing, as instances of this data structures are typically used for performance sensitive code. Reviewed-by: brutisso, stefank
author tschatzl
date Mon, 24 Mar 2014 15:31:00 +0100
parents d7070f371770
children
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line diff
--- a/src/share/vm/memory/padded.inline.hpp	Mon Mar 24 15:30:56 2014 +0100
+++ b/src/share/vm/memory/padded.inline.hpp	Mon Mar 24 15:31:00 2014 +0100
@@ -76,3 +76,13 @@
 
   return result;
 }
+
+template <class T, MEMFLAGS flags, size_t alignment>
+T* PaddedPrimitiveArray<T, flags, alignment>::create_unfreeable(size_t length) {
+  // Allocate a chunk of memory large enough to allow for some alignment.
+  void* chunk = AllocateHeap(length * sizeof(T) + alignment, flags);
+
+  memset(chunk, 0, length * sizeof(T) + alignment);
+
+  return (T*)align_pointer_up(chunk, alignment);
+}