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diff src/share/vm/runtime/virtualspace.cpp @ 325:93befa083681

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6741004: UseLargePages + UseCompressedOops breaks implicit null checking guard page Summary: Turn off c2 implicit null checking on windows and large pages specified. Reviewed-by: jrose, xlu
author coleenp
date Tue, 02 Sep 2008 15:18:26 -0400
parents 1fdb98a17101
children 9ee9cf798b59 032ddb9432ad
line wrap: on
line diff
--- a/src/share/vm/runtime/virtualspace.cpp	Sun Aug 31 15:24:54 2008 -0700
+++ b/src/share/vm/runtime/virtualspace.cpp	Tue Sep 02 15:18:26 2008 -0400
@@ -380,7 +380,8 @@
                                      bool large, char* requested_address) :
   ReservedSpace(size, alignment, large,
                 requested_address,
-                UseCompressedOops ? lcm(os::vm_page_size(), alignment) : 0) {
+                UseCompressedOops && UseImplicitNullCheckForNarrowOop ?
+                  lcm(os::vm_page_size(), alignment) : 0) {
   // Only reserved space for the java heap should have a noaccess_prefix
   // if using compressed oops.
   protect_noaccess_prefix(size);
@@ -391,7 +392,8 @@
                                      const size_t suffix_size,
                                      const size_t suffix_align) :
   ReservedSpace(prefix_size, prefix_align, suffix_size, suffix_align,
-                UseCompressedOops ? lcm(os::vm_page_size(), prefix_align) : 0) {
+                UseCompressedOops && UseImplicitNullCheckForNarrowOop ?
+                  lcm(os::vm_page_size(), prefix_align) : 0) {
   protect_noaccess_prefix(prefix_size+suffix_size);
 }