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authorMing Lei <ming.lei@redhat.com>2018-12-17 04:46:00 +0300
committerJens Axboe <axboe@kernel.dk>2018-12-17 05:53:47 +0300
commitcc56694f132a8f5fa9334e3afe990de8c3378866 (patch)
treec67715ced5609fdcd34e95c3dcc24e6bc8ae494a /block/blk-rq-qos.c
parentf9824952ee1cd02ae1a74e35e0e8653f8a4db772 (diff)
downloadlinux-cc56694f132a8f5fa9334e3afe990de8c3378866.tar.xz
blk-mq-debugfs: support rq_qos
blk-mq-debugfs has been proved as very helpful for debug some tough issues, such as IO hang. We have seen blk-wbt related IO hang several times, even inside Red Hat BZ, there is such report not sovled yet, so this patch adds support debugfs on rq_qos. Cc: Bart Van Assche <bart.vanassche@wdc.com> Cc: Omar Sandoval <osandov@fb.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-rq-qos.c')
-rw-r--r--block/blk-rq-qos.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/block/blk-rq-qos.c b/block/blk-rq-qos.c
index e932ef9d2718..d169d7188fa6 100644
--- a/block/blk-rq-qos.c
+++ b/block/blk-rq-qos.c
@@ -264,6 +264,8 @@ void rq_qos_wait(struct rq_wait *rqw, void *private_data,
void rq_qos_exit(struct request_queue *q)
{
+ blk_mq_debugfs_unregister_queue_rqos(q);
+
while (q->rq_qos) {
struct rq_qos *rqos = q->rq_qos;
q->rq_qos = rqos->next;