From: Joseph Qi <qijiang.qj@xxxxxxxxxxxxxxx>
dm device set QUEUE_FLAG_NONROT in resume, which is after register
queue. That is to mean, the previous initialization in
blk_throtl_register_queue is wrong in this case.
Fix it by checking and then updating the info during root tg
initialization as we don't have a better choice.
Signed-off-by: Joseph Qi <qijiang.qj@xxxxxxxxxxxxxxx>
---
block/blk-throttle.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 17816a0..6aeb79e 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -539,6 +539,21 @@ static void throtl_pd_init(struct blkg_policy_data *pd)
sq->parent_sq = &td->service_queue;
if (cgroup_subsys_on_dfl(io_cgrp_subsys) && blkg->parent)
sq->parent_sq = &blkg_to_tg(blkg->parent)->service_queue;
+
+ /*
+ * dm device set QUEUE_FLAG_NONROT in resume, which is after resister
+ * queue, so the previous initialization is wrong in this case. Check
+ * and update it here.
+ */
+ if (blk_queue_nonrot(blkg->q) &&
+ td->filtered_latency != LATENCY_FILTERED_SSD) {
+ int i;
+
+ td->throtl_slice = DFL_THROTL_SLICE_SSD;
+ td->filtered_latency = LATENCY_FILTERED_SSD;
+ for (i = 0; i < LATENCY_BUCKET_SIZE; i++)
+ td->avg_buckets[i].latency = 0;
+ }
tg->td = td;
}
--
1.9.4
