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diff src/cpu/x86/vm/vm_version_x86.cpp @ 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 6ae7a1561b53
children 9f12ede5571a
line wrap: on
line diff
--- a/src/cpu/x86/vm/vm_version_x86.cpp	Tue Aug 16 11:53:57 2011 -0700
+++ b/src/cpu/x86/vm/vm_version_x86.cpp	Tue Aug 16 16:59:46 2011 -0700
@@ -557,14 +557,16 @@
   if( !supports_sse() && supports_3dnow_prefetch() ) AllocatePrefetchInstr = 3;
 
   // Allocation prefetch settings
-  intx cache_line_size = L1_data_cache_line_size();
+  intx cache_line_size = prefetch_data_size();
   if( cache_line_size > AllocatePrefetchStepSize )
     AllocatePrefetchStepSize = cache_line_size;
-  if( FLAG_IS_DEFAULT(AllocatePrefetchLines) )
-    AllocatePrefetchLines = 3; // Optimistic value
+
   assert(AllocatePrefetchLines > 0, "invalid value");
-  if( AllocatePrefetchLines < 1 ) // set valid value in product VM
-    AllocatePrefetchLines = 1; // Conservative value
+  if( AllocatePrefetchLines < 1 )     // set valid value in product VM
+    AllocatePrefetchLines = 3;
+  assert(AllocateInstancePrefetchLines > 0, "invalid value");
+  if( AllocateInstancePrefetchLines < 1 ) // set valid value in product VM
+    AllocateInstancePrefetchLines = 1;
 
   AllocatePrefetchDistance = allocate_prefetch_distance();
   AllocatePrefetchStyle    = allocate_prefetch_style();
@@ -601,10 +603,11 @@
     tty->print_cr("Logical CPUs per core: %u",
                   logical_processors_per_package());
     tty->print_cr("UseSSE=%d",UseSSE);
-    tty->print("Allocation: ");
+    tty->print("Allocation");
     if (AllocatePrefetchStyle <= 0 || UseSSE == 0 && !supports_3dnow_prefetch()) {
-      tty->print_cr("no prefetching");
+      tty->print_cr(": no prefetching");
     } else {
+      tty->print(" prefetching: ");
       if (UseSSE == 0 && supports_3dnow_prefetch()) {
         tty->print("PREFETCHW");
       } else if (UseSSE >= 1) {
@@ -619,9 +622,9 @@
         }
       }
       if (AllocatePrefetchLines > 1) {
-        tty->print_cr(" %d, %d lines with step %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize);
+        tty->print_cr(" at distance %d, %d lines of %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize);
       } else {
-        tty->print_cr(" %d, one line", AllocatePrefetchDistance);
+        tty->print_cr(" at distance %d, one line of %d bytes", AllocatePrefetchDistance, AllocatePrefetchStepSize);
       }
     }