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Date: Thu, 17 Feb 2022 11:13:49 +0800
From: "Wang Jianchao (Kuaishou)" <jianchao.wan9@...il.com>
To: Jens Axboe <axboe@...nel.dk>
Cc: Josef Bacik <jbacik@...com>, Tejun Heo <tj@...nel.org>,
Bart Van Assche <bvanassche@....org>,
linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC V4 6/6] blk: export the sysfs for switching qos
All of the blk-rq-qos policies has been changed to use the new
interfaces. Thus we can export the sysfs interface, namely
/sys/block/xxx/queue/qos and get rid of the unused interfaces.
Signed-off-by: Wang Jianchao (Kuaishou) <jianchao.wan9@...il.com>
---
block/blk-mq-debugfs.c | 10 +------
block/blk-rq-qos.h | 63 +-----------------------------------------
block/blk-sysfs.c | 2 ++
3 files changed, 4 insertions(+), 71 deletions(-)
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index cbbd668029a1..3defd5cb1cea 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -823,11 +823,6 @@ void blk_mq_debugfs_unregister_sched(struct request_queue *q)
q->sched_debugfs_dir = NULL;
}
-static const char *rq_qos_id_to_name(enum rq_qos_id id)
-{
- return "unknown";
-}
-
void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
{
debugfs_remove_recursive(rqos->debugfs_dir);
@@ -837,9 +832,6 @@ void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
{
struct request_queue *q = rqos->q;
- const char *dir_name;
-
- dir_name = rqos->ops->name ? rqos->ops->name : rq_qos_id_to_name(rqos->id);
if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs)
return;
@@ -848,7 +840,7 @@ void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
q->rqos_debugfs_dir = debugfs_create_dir("rqos",
q->debugfs_dir);
- rqos->debugfs_dir = debugfs_create_dir(dir_name,
+ rqos->debugfs_dir = debugfs_create_dir(rqos->ops->name,
rqos->q->rqos_debugfs_dir);
debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs);
diff --git a/block/blk-rq-qos.h b/block/blk-rq-qos.h
index bba829bbb461..262d221794f5 100644
--- a/block/blk-rq-qos.h
+++ b/block/blk-rq-qos.h
@@ -13,10 +13,6 @@
struct blk_mq_debugfs_attr;
-enum rq_qos_id {
- RQ_QOS_UNUSED,
-};
-
struct rq_wait {
wait_queue_head_t wait;
atomic_t inflight;
@@ -25,7 +21,7 @@ struct rq_wait {
struct rq_qos {
const struct rq_qos_ops *ops;
struct request_queue *q;
- enum rq_qos_id id;
+ int id;
refcount_t ref;
wait_queue_head_t waitq;
bool dying;
@@ -69,17 +65,6 @@ struct rq_depth {
unsigned int default_depth;
};
-static inline struct rq_qos *rq_qos_id(struct request_queue *q,
- enum rq_qos_id id)
-{
- struct rq_qos *rqos;
- for (rqos = q->rq_qos; rqos; rqos = rqos->next) {
- if (rqos->id == id)
- break;
- }
- return rqos;
-}
-
static inline struct rq_qos *rq_qos_by_id(struct request_queue *q, int id)
{
struct rq_qos *rqos;
@@ -99,52 +84,6 @@ static inline void rq_wait_init(struct rq_wait *rq_wait)
init_waitqueue_head(&rq_wait->wait);
}
-static inline void rq_qos_add(struct request_queue *q, struct rq_qos *rqos)
-{
- /*
- * No IO can be in-flight when adding rqos, so freeze queue, which
- * is fine since we only support rq_qos for blk-mq queue.
- *
- * Reuse ->queue_lock for protecting against other concurrent
- * rq_qos adding/deleting
- */
- blk_mq_freeze_queue(q);
-
- spin_lock_irq(&q->queue_lock);
- rqos->next = q->rq_qos;
- q->rq_qos = rqos;
- spin_unlock_irq(&q->queue_lock);
-
- blk_mq_unfreeze_queue(q);
-
- if (rqos->ops->debugfs_attrs)
- blk_mq_debugfs_register_rqos(rqos);
-}
-
-static inline void rq_qos_del(struct request_queue *q, struct rq_qos *rqos)
-{
- struct rq_qos **cur;
-
- /*
- * See comment in rq_qos_add() about freezing queue & using
- * ->queue_lock.
- */
- blk_mq_freeze_queue(q);
-
- spin_lock_irq(&q->queue_lock);
- for (cur = &q->rq_qos; *cur; cur = &(*cur)->next) {
- if (*cur == rqos) {
- *cur = rqos->next;
- break;
- }
- }
- spin_unlock_irq(&q->queue_lock);
-
- blk_mq_unfreeze_queue(q);
-
- blk_mq_debugfs_unregister_rqos(rqos);
-}
-
int rq_qos_register(struct rq_qos_ops *ops);
void rq_qos_unregister(struct rq_qos_ops *ops);
void rq_qos_activate(struct request_queue *q,
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 9f32882ceb2f..c02747db4e3b 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -574,6 +574,7 @@ QUEUE_RO_ENTRY(queue_max_segments, "max_segments");
QUEUE_RO_ENTRY(queue_max_integrity_segments, "max_integrity_segments");
QUEUE_RO_ENTRY(queue_max_segment_size, "max_segment_size");
QUEUE_RW_ENTRY(elv_iosched, "scheduler");
+QUEUE_RW_ENTRY(queue_qos, "qos");
QUEUE_RO_ENTRY(queue_logical_block_size, "logical_block_size");
QUEUE_RO_ENTRY(queue_physical_block_size, "physical_block_size");
@@ -633,6 +634,7 @@ static struct attribute *queue_attrs[] = {
&queue_max_integrity_segments_entry.attr,
&queue_max_segment_size_entry.attr,
&elv_iosched_entry.attr,
+ &queue_qos_entry.attr,
&queue_hw_sector_size_entry.attr,
&queue_logical_block_size_entry.attr,
&queue_physical_block_size_entry.attr,
--
2.17.1
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