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Diffstat (limited to 'net/ceph/crush/mapper.c')
| -rw-r--r-- | net/ceph/crush/mapper.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/net/ceph/crush/mapper.c b/net/ceph/crush/mapper.c index caeb1066bea3..77b7a73e65cf 100644 --- a/net/ceph/crush/mapper.c +++ b/net/ceph/crush/mapper.c @@ -514,6 +514,14 @@ static void crush_choose_indep(const struct crush_map *map, /* choose through intervening buckets */ for (;;) { + /* note: we base the choice on the position + * even in the nested call. that means that + * if the first layer chooses the same bucket + * in a different position, we will tend to + * choose a different item in that bucket. + * this will involve more devices in data + * movement and tend to distribute the load. + */ r = rep; /* be careful */ |