# HG changeset patch
# User johnc
# Date 1298052454 28800
# Node ID 1ec37096cecfc19fbbba0fcafbae51471a8f2f8d
# Parent  c6491db25cb2daf50242fcf538d6405bc9bc02d8
7020042: G1: Partially remove fix for 6994628
Summary: Disable reference discovery and processing during concurrent marking by disabling fix for 6994628.
Reviewed-by: tonyp, ysr

diff -r c6491db25cb2 -r 1ec37096cecf src/share/vm/gc_implementation/g1/concurrentMark.cpp
--- a/src/share/vm/gc_implementation/g1/concurrentMark.cpp	Thu Feb 17 21:11:47 2011 -0800
+++ b/src/share/vm/gc_implementation/g1/concurrentMark.cpp	Fri Feb 18 10:07:34 2011 -0800
@@ -2951,8 +2951,12 @@
                CMTask* task)
     : _g1h(g1h), _cm(cm), _task(task)
   {
-    _ref_processor = g1h->ref_processor();
-    assert(_ref_processor != NULL, "should not be NULL");
+    assert(_ref_processor == NULL, "should be initialized to NULL");
+
+    if (G1UseConcMarkReferenceProcessing) {
+      _ref_processor = g1h->ref_processor();
+      assert(_ref_processor != NULL, "should not be NULL");
+    }
   }
 };
 
diff -r c6491db25cb2 -r 1ec37096cecf src/share/vm/gc_implementation/g1/g1_globals.hpp
--- a/src/share/vm/gc_implementation/g1/g1_globals.hpp	Thu Feb 17 21:11:47 2011 -0800
+++ b/src/share/vm/gc_implementation/g1/g1_globals.hpp	Fri Feb 18 10:07:34 2011 -0800
@@ -81,6 +81,11 @@
   product(intx, G1MarkRegionStackSize, 1024 * 1024,                         \
           "Size of the region stack for concurrent marking.")               \
                                                                             \
+  experimental(bool, G1UseConcMarkReferenceProcessing, false,               \
+          "If true, enable reference discovery during concurrent "          \
+          "marking and reference processing at the end of remark "          \
+          "(unsafe).")                                                      \
+                                                                            \
   develop(bool, G1SATBBarrierPrintNullPreVals, false,                       \
           "If true, count frac of ptr writes with null pre-vals.")          \
                                                                             \