malloc: set default tcache fill count to 16

Now that the fastbins are gone, set the default per size class length of
tcache to 16. We observe that doing this retains the original performance
of malloc.

Reviewed-by: DJ Delorie <dj@redhat.com>

diff --git a/malloc/malloc.c b/malloc/malloc.c
index eaf3fc36ca039b929361ae3e9a04ea86dd6be94a..08ca1879ac7bfab2de7310f094ec7fe639c96f99 100644 (file)
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -314,7 +314,7 @@
 
 /* This is another arbitrary limit, which tunables can change.  Each
    tcache bin will hold at most this number of chunks.  */
-# define TCACHE_FILL_COUNT 7
+# define TCACHE_FILL_COUNT 16
 
 /* Maximum chunks in tcache bins for tunables.  This value must fit the range
    of tcache->num_slots[] entries, else they may overflow.  */