Add fields for storage manager statistics.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@1564 d4fa192b-c00b-0410-8231-f00ffab90ce4

include/stat_field.h

@@ -84,3 +84,8 @@ MAC_STAT(sess_herd,		uint64_t, "u", "Session herd")
 MAC_STAT(shm_records,		uint64_t, "u", "SHM records")
 MAC_STAT(shm_writes,		uint64_t, "u", "SHM writes")
 MAC_STAT(shm_cont,		uint64_t, "u", "SHM MTX contention")
+
+MAC_STAT(sm_nreq,		uint64_t, "u", "allocator requests")
+MAC_STAT(sm_nobj,		uint64_t, "u", "outstanding allocations")
+MAC_STAT(sm_balloc,		uint64_t, "u", "bytes allocated")
+MAC_STAT(sm_bfree,		uint64_t, "u", "bytes free")