summaryrefslogtreecommitdiff
path: root/block
diff options
context:
space:
mode:
Diffstat (limited to 'block')
-rw-r--r--block/bfq-cgroup.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index c83d90c99..32cd8ab1c 100644
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c
@@ -638,6 +638,18 @@ static void bfq_bic_update_cgroup(struct bfq_io_cq *bic, struct bio *bio)
if (unlikely(!bfqd) || likely(bic->blkcg_serial_nr == serial_nr))
goto out;
+ /*
+ * If we have a non-root cgroup, we can depend on that to
+ * do proper throttling of writes. Turn off wbt for that
+ * case.
+ */
+ if (bio_blkcg(bio) != &blkcg_root) {
+ struct request_queue *q = bfqd->queue;
+
+ if (q->rq_wb)
+ wbt_disable(q->rq_wb);
+ }
+
bfqg = __bfq_bic_change_cgroup(bfqd, bic, bio_blkcg(bio));
bic->blkcg_serial_nr = serial_nr;
out: