Update.

2004-11-13  Ulrich Drepper  <drepper@redhat.com>

	* malloc/malloc.c (malloc_state): stat_lock_* elements need only
	be defined if THREAD_STATS is defined.  Remove pad0_ since it does
	not align with cache line sizes in general anyway.

ChangeLog

@@ -1,3 +1,9 @@
+2004-11-13  Ulrich Drepper  <drepper@redhat.com>
+
+	* malloc/malloc.c (malloc_state): stat_lock_* elements need only
+	be defined if THREAD_STATS is defined.  Remove pad0_ since it does
+	not align with cache line sizes in general anyway.
+
 2004-11-13  Jakub Jelinek  <jakub@redhat.com>
 
 	* elf/rtld.c (print_statistics): Avoid segfaults if not all namespaces

malloc/malloc.c

@@ -2192,10 +2192,12 @@ typedef struct malloc_chunk* mfastbinptr;
 struct malloc_state {
   /* Serialize access.  */
   mutex_t mutex;
+  // Should we have padding to move the mutex to its own cache line?
 
+#if THREAD_STATS
   /* Statistics for locking.  Only used if THREAD_STATS is defined.  */
   long stat_lock_direct, stat_lock_loop, stat_lock_wait;
-  long pad0_[1]; /* try to give the mutex its own cacheline */
+#endif
 
   /* The maximum chunk size to be eligible for fastbin */
   INTERNAL_SIZE_T  max_fast;   /* low 2 bits used as flags */