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diff src/share/vm/runtime/vm_version.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 1d1603768966
children c77d473e71f7
line wrap: on
line diff
--- a/src/share/vm/runtime/vm_version.hpp	Tue Aug 16 11:53:57 2011 -0700
+++ b/src/share/vm/runtime/vm_version.hpp	Tue Aug 16 16:59:46 2011 -0700
@@ -44,6 +44,7 @@
   static bool         _initialized;
   static int          _parallel_worker_threads;
   static bool         _parallel_worker_threads_initialized;
+  static int          _reserve_for_allocation_prefetch;
 
   static unsigned int nof_parallel_worker_threads(unsigned int num,
                                                   unsigned int dem,
@@ -77,6 +78,12 @@
     return _logical_processors_per_package;
   }
 
+  // Need a space at the end of TLAB for prefetch instructions
+  // which may fault when accessing memory outside of heap.
+  static int reserve_for_allocation_prefetch() {
+    return _reserve_for_allocation_prefetch;
+  }
+
   // ARCH specific policy for the BiasedLocking
   static bool use_biased_locking()  { return true; }