crush: do is_out test only if we do not collide
The is_out() test may require an additional hashing operation, so we
should skip it whenever possible.
Reflects ceph.git commit db107cc7f15cf2481894add325dc93e33479f529.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/net/ceph/crush/mapper.c b/net/ceph/crush/mapper.c
index 2e31217..84d2de0 100644
--- a/net/ceph/crush/mapper.c
+++ b/net/ceph/crush/mapper.c
@@ -552,14 +552,12 @@ static int crush_choose_firstn(const struct crush_map *map,
}
}
- if (!reject) {
+ if (!reject && !collide) {
/* out? */
if (itemtype == 0)
reject = is_out(map, weight,
weight_max,
item, x);
- else
- reject = 0;
}
reject: