changeset 11287:3f2183f143b2

Merge
author dsamersoff
date Tue, 24 May 2016 10:03:07 +0000
parents 9dd574967e9b 18194796107b
children 3c3f82513ffc
files
diffstat 2 files changed, 7 insertions(+), 10 deletions(-) [+]
line wrap: on
line diff
--- a/src/share/vm/gc/shared/threadLocalAllocBuffer.cpp	Tue May 24 12:56:41 2016 +0300
+++ b/src/share/vm/gc/shared/threadLocalAllocBuffer.cpp	Tue May 24 10:03:07 2016 +0000
@@ -216,8 +216,10 @@
 
   _global_stats = new GlobalTLABStats();
 
-  // Need extra space at the end of TLAB, otherwise prefetching
-  // instructions will fault (due to accessing memory outside of heap).
+#ifdef COMPILER2
+  // If the C2 compiler is present, extra space is needed at the end of
+  // TLABs, otherwise prefetching instructions generated by the C2
+  // compiler will fault (due to accessing memory outside of heap).
   // The amount of space is the max of the number of lines to
   // prefetch for array and for instance allocations. (Extra space must be
   // reserved to accommodate both types of allocations.)
@@ -227,11 +229,14 @@
   // AllocatePrefetchInstr==1). To be on the safe side, however,
   // extra space is reserved for all combinations of
   // AllocatePrefetchStyle and AllocatePrefetchInstr.
+  //
+  // If the C2 compiler is not present, no space is reserved.
 
   // +1 for rounding up to next cache line, +1 to be safe
   int lines =  MAX2(AllocatePrefetchLines, AllocateInstancePrefetchLines) + 2;
   _reserve_for_allocation_prefetch = (AllocatePrefetchDistance + AllocatePrefetchStepSize * lines) /
                                      (int)HeapWordSize;
+#endif
 
   // During jvm startup, the main (primordial) thread is initialized
   // before the heap is initialized.  So reinitialize it now.
--- a/test/runtime/CommandLine/OptionsValidation/TestOptionsWithRanges.java	Tue May 24 12:56:41 2016 +0300
+++ b/test/runtime/CommandLine/OptionsValidation/TestOptionsWithRanges.java	Tue May 24 10:03:07 2016 +0000
@@ -90,14 +90,6 @@
         excludeTestMaxRange("CICompilerCount");
 
         /*
-         * JDK-8156679
-         * Temporarily exclude from range testing as the range is not
-         * valid for all platforms
-         */
-        excludeTestRange("AllocatePrefetchLines");
-        excludeTestRange("AllocateInstancePrefetchLines");
-
-        /*
          * JDK-8136766
          * Temporarily remove ThreadStackSize from testing because Windows can set it to 0
          * (for default OS size) but other platforms insist it must be greater than 0