--- libc/elf/dl-lookup.c.jj	2009-06-22 15:40:35.000000000 -0400
+++ libc/elf/dl-lookup.c	2009-12-16 10:26:10.403974000 -0500
@@ -379,7 +379,8 @@ _dl_lookup_symbol_x (const char *undef_n
 				  version, type_class, flags, skip_map);
 
   /* The object is used.  */
-  current_value.m->l_used = 1;
+  if (__builtin_expect (current_value.m->l_used == 0, 0))
+    current_value.m->l_used = 1;
 
   if (__builtin_expect (GLRO(dl_debug_mask)
 			& (DL_DEBUG_BINDINGS|DL_DEBUG_PRELINK), 0))
--- libc/elf/dl-object.c.jj	2009-06-22 15:40:38.000000000 -0400
+++ libc/elf/dl-object.c	2009-12-16 10:27:15.965268000 -0500
@@ -67,6 +67,10 @@ _dl_new_object (char *realname, const ch
 
   new->l_name = realname;
   new->l_type = type;
+  /* If we set the bit now since we know it is never used we avoid
+     dirtying the cache line later.  */
+  if ((GLRO(dl_debug_mask) & DL_DEBUG_UNUSED) == 0)
+    new->l_used = 1;
   new->l_loader = loader;
 #if defined USE_TLS && NO_TLS_OFFSET != 0
   new->l_tls_offset = NO_TLS_OFFSET;
--- libc/elf/rtld.c.jj	2009-06-22 15:40:35.000000000 -0400
+++ libc/elf/rtld.c	2009-12-16 10:44:25.572605000 -0500
@@ -2668,6 +2668,8 @@ process_envvars (enum mode *modep)
 
   /* The caller wants this information.  */
   *modep = mode;
+  if (__builtin_expect (mode == normal, 1))
+    GLRO(dl_debug_mask) &= ~DL_DEBUG_UNUSED;
 
   /* Extra security for SUID binaries.  Remove all dangerous environment
      variables.  */