* malloc/arena.c (arena_get2): Avoid unnecessarily
	retrieving #cpus from /proc.
	* malloc/malloc.c (mALLOPt): Clamp arena_test based on
	the value of arena_max.

diff --git a/malloc/arena.c b/malloc/arena.c
index cb8548b..00f1da5 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -828,7 +828,7 @@ arena_get2(mstate a_tsd, size_t size)
 	{
 	  if (mp_.arena_max != 0)
 	    narenas_limit = mp_.arena_max;
-	  else
+	  else if (narenas > mp_.arena_test)
 	    {
 	      int n  = __get_nprocs ();
 
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 8608083..f8d32da 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -6134,6 +6134,12 @@ int mALLOPt(param_number, value) int par
     break;
 #endif
   }
+#ifdef PER_THREAD
+  /* Clamp ARENA_TEST from ARENA_MAX to avoid creating too many
+     arenas.  */
+  if (mp_.arena_max > 0 && mp_.arena_max <= mp_.arena_test)
+    mp_.arena_test = mp_.arena_max - 1;
+#endif
   (void)mutex_unlock(&av->mutex);
   return res;
 }