--- old/src/share/vm/c1/c1_LIRGenerator.cpp	2014-02-11 12:51:01.488558055 +0400
+++ new/src/share/vm/c1/c1_LIRGenerator.cpp	2014-02-11 12:51:01.380558053 +0400
@@ -1734,7 +1734,8 @@
                 (info ? new CodeEmitInfo(info) : NULL));
   }
 
-  if (is_volatile && !needs_patching) {
+  bool needs_atomic_access = is_volatile || AlwaysAtomicAccesses;
+  if (needs_atomic_access && !needs_patching) {
     volatile_field_store(value.result(), address, info);
   } else {
     LIR_PatchCode patch_code = needs_patching ? lir_patch_normal : lir_patch_none;
@@ -1807,7 +1808,8 @@
     address = generate_address(object.result(), x->offset(), field_type);
   }
 
-  if (is_volatile && !needs_patching) {
+  bool needs_atomic_access = is_volatile || AlwaysAtomicAccesses;
+  if (needs_atomic_access && !needs_patching) {
     volatile_field_load(address, reg, info);
   } else {
     LIR_PatchCode patch_code = needs_patching ? lir_patch_normal : lir_patch_none;
--- old/src/share/vm/opto/parse3.cpp	2014-02-11 12:51:01.996558067 +0400
+++ new/src/share/vm/opto/parse3.cpp	2014-02-11 12:51:01.884558065 +0400
@@ -233,7 +233,8 @@
   // Build the load.
   //
   MemNode::MemOrd mo = is_vol ? MemNode::acquire : MemNode::unordered;
-  Node* ld = make_load(NULL, adr, type, bt, adr_type, mo, is_vol);
+  bool needs_atomic_access = is_vol || AlwaysAtomicAccesses;
+  Node* ld = make_load(NULL, adr, type, bt, adr_type, mo, needs_atomic_access);
 
   // Adjust Java stack
   if (type2size[bt] == 1)
@@ -314,7 +315,8 @@
     }
     store = store_oop_to_object(control(), obj, adr, adr_type, val, field_type, bt, mo);
   } else {
-    store = store_to_memory(control(), adr, val, bt, adr_type, mo, is_vol);
+    bool needs_atomic_access = is_vol || AlwaysAtomicAccesses;
+    store = store_to_memory(control(), adr, val, bt, adr_type, mo, needs_atomic_access);
   }
 
   // If reference is volatile, prevent following volatiles ops from
--- old/src/share/vm/runtime/globals.hpp	2014-02-11 12:51:02.464558078 +0400
+++ new/src/share/vm/runtime/globals.hpp	2014-02-11 12:51:02.348558076 +0400
@@ -3859,6 +3859,9 @@
           "Allocation less than this value will be allocated "              \
           "using malloc. Larger allocations will use mmap.")                \
                                                                             \
+  experimental(bool, AlwaysAtomicAccesses, false,                           \
+          "Accesses to all variables should always be atomic")              \
+                                                                            \
   product(bool, EnableTracing, false,                                       \
           "Enable event-based tracing")                                     \
                                                                             \