Index: /trunk/src/VBox/Additions/common/VBoxService/VBoxServiceBalloon.cpp
===================================================================
--- /trunk/src/VBox/Additions/common/VBoxService/VBoxServiceBalloon.cpp	(revision 29542)
+++ /trunk/src/VBox/Additions/common/VBoxService/VBoxServiceBalloon.cpp	(revision 29543)
@@ -63,7 +63,10 @@
 {
 #ifdef RT_OS_LINUX
-    void *pv = RTMemPageAlloc(PAGE_SIZE);
-    g_fSysMadviseWorks = madvise(pv, PAGE_SIZE, MADV_DONTFORK) == 0;
-    RTMemPageFree(pv, PAGE_SIZE);
+    void *pv = (void*)mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+    if (pv != MAP_FAILED)
+    {
+        g_fSysMadviseWorks = madvise(pv, PAGE_SIZE, MADV_DONTFORK) == 0;
+        munmap(pv, PAGE_SIZE);
+    }
 #endif
 }