smalloc: limit to 1 pool, and bump size to 16MB

We can easily add new pools, but if we do this after jobs have been
forked off, then it wont really be shared storage as the new mmap
mappings will only apply to the process that instantiated them.
Since we moved the randommap mappings to private storage, we should
not need a lot of room for shared allocations. Hence I hope the 16MB
will suffice.

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/smalloc.c b/smalloc.c
index 1ba9353..67cb7cc 100644
--- a/smalloc.c
+++ b/smalloc.c
@@ -25,8 +25,8 @@
 #define SMALLOC_BPI	(sizeof(unsigned int) * 8)
 #define SMALLOC_BPL	(SMALLOC_BPB * SMALLOC_BPI)
 
-#define INITIAL_SIZE	8192*1024	/* new pool size */
-#define MAX_POOLS	128		/* maximum number of pools to setup */
+#define INITIAL_SIZE	16*1024*1024	/* new pool size */
+#define MAX_POOLS	1		/* maximum number of pools to setup */
 
 #define SMALLOC_PRE_RED		0xdeadbeefU
 #define SMALLOC_POST_RED	0x5aa55aa5U