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diff src/share/vm/memory/threadLocalAllocBuffer.hpp @ 3854:1af104d6cf99

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7079329: Adjust allocation prefetching for T4 Summary: on T4 2 BIS instructions should be issued to prefetch 64 bytes Reviewed-by: iveresov, phh, twisti
author kvn
date Tue, 16 Aug 2011 16:59:46 -0700
parents b1a2afa37ec4
children d2a62e0f25eb
line wrap: on
line diff
--- a/src/share/vm/memory/threadLocalAllocBuffer.hpp	Tue Aug 16 11:53:57 2011 -0700
+++ b/src/share/vm/memory/threadLocalAllocBuffer.hpp	Tue Aug 16 16:59:46 2011 -0700
@@ -124,16 +124,7 @@
   // Reserve space at the end of TLAB
   static size_t end_reserve() {
     int reserve_size = typeArrayOopDesc::header_size(T_INT);
-    if (AllocatePrefetchStyle == 3) {
-      // BIS is used to prefetch - we need a space for it.
-      // +1 for rounding up to next cache line +1 to be safe
-      int lines = AllocatePrefetchLines + 2;
-      int step_size = AllocatePrefetchStepSize;
-      int distance = AllocatePrefetchDistance;
-      int prefetch_end = (distance + step_size*lines)/(int)HeapWordSize;
-      reserve_size = MAX2(reserve_size, prefetch_end);
-    }
-    return reserve_size;
+    return MAX2(reserve_size, VM_Version::reserve_for_allocation_prefetch());
   }
   static size_t alignment_reserve()              { return align_object_size(end_reserve()); }
   static size_t alignment_reserve_in_bytes()     { return alignment_reserve() * HeapWordSize; }