8067469: G1 ignores AlwaysPreTouch

Summary: Factor out pretouch code of the various virtual space management classes and use them everywhere including in G1.
Reviewed-by: stefank, ehelin, dholmes

1 files changed, 3 insertions, 0 deletions

diff --git a/src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp b/src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp
index 662d28aee..f483dbbf4 100644
--- a/src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp
+++ b/src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp
@@ -144,6 +144,9 @@ bool G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) {
   }
   _committed.set_range(start, end);
 
+  if (AlwaysPreTouch) {
+    os::pretouch_memory(page_start(start), page_start(start) + byte_size_for_pages(size_in_pages));
+  }
   return zero_filled;
 }