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Message-Id: <20220217031349.98561-3-jianchao.wan9@gmail.com>
Date: Thu, 17 Feb 2022 11:13:45 +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 2/6] blk-wbt: make wbt pluggable
This patch makes wbt pluggable through /sys/block/xxx/queue/qos.
Some queue_lock/unlock is added to protect rq_qos_by_id() in
wbt_rq_qos(). By default, wbt is enabled which is same with previous
code.
Signed-off-by: Wang Jianchao (Kuaishou) <jianchao.wan9@...il.com>
---
block/blk-mq-debugfs.c | 2 --
block/blk-rq-qos.h | 6 -----
block/blk-wbt.c | 51 +++++++++++++++++++++++++++++++++++-------
block/blk-wbt.h | 6 +++++
4 files changed, 49 insertions(+), 16 deletions(-)
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 8b6d557e1ad6..a5d78b094234 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -826,8 +826,6 @@ void blk_mq_debugfs_unregister_sched(struct request_queue *q)
static const char *rq_qos_id_to_name(enum rq_qos_id id)
{
switch (id) {
- case RQ_QOS_WBT:
- return "wbt";
case RQ_QOS_LATENCY:
return "latency";
case RQ_QOS_COST:
diff --git a/block/blk-rq-qos.h b/block/blk-rq-qos.h
index 586c3f5ec152..171a83d6de45 100644
--- a/block/blk-rq-qos.h
+++ b/block/blk-rq-qos.h
@@ -14,7 +14,6 @@
struct blk_mq_debugfs_attr;
enum rq_qos_id {
- RQ_QOS_WBT,
RQ_QOS_LATENCY,
RQ_QOS_COST,
RQ_QOS_IOPRIO,
@@ -96,11 +95,6 @@ static inline struct rq_qos *rq_qos_by_id(struct request_queue *q, int id)
return rqos;
}
-static inline struct rq_qos *wbt_rq_qos(struct request_queue *q)
-{
- return rq_qos_id(q, RQ_QOS_WBT);
-}
-
static inline struct rq_qos *blkcg_rq_qos(struct request_queue *q)
{
return rq_qos_id(q, RQ_QOS_LATENCY);
diff --git a/block/blk-wbt.c b/block/blk-wbt.c
index 0c119be0e813..8aa85303bbbc 100644
--- a/block/blk-wbt.c
+++ b/block/blk-wbt.c
@@ -31,6 +31,13 @@
#define CREATE_TRACE_POINTS
#include <trace/events/wbt.h>
+static struct rq_qos_ops wbt_rqos_ops;
+
+struct rq_qos *wbt_rq_qos(struct request_queue *q)
+{
+ return rq_qos_by_id(q, wbt_rqos_ops.id);
+}
+
static inline void wbt_clear_state(struct request *rq)
{
rq->wbt_flags = 0;
@@ -628,9 +635,13 @@ static void wbt_requeue(struct rq_qos *rqos, struct request *rq)
void wbt_set_write_cache(struct request_queue *q, bool write_cache_on)
{
- struct rq_qos *rqos = wbt_rq_qos(q);
+ struct rq_qos *rqos;
+
+ spin_lock_irq(&q->queue_lock);
+ rqos = wbt_rq_qos(q);
if (rqos)
RQWB(rqos)->wc = write_cache_on;
+ spin_unlock_irq(&q->queue_lock);
}
/*
@@ -638,14 +649,20 @@ void wbt_set_write_cache(struct request_queue *q, bool write_cache_on)
*/
void wbt_enable_default(struct request_queue *q)
{
- struct rq_qos *rqos = wbt_rq_qos(q);
+ struct rq_qos *rqos;
+
+ spin_lock_irq(&q->queue_lock);
+ rqos = wbt_rq_qos(q);
/* Throttling already enabled? */
if (rqos) {
if (RQWB(rqos)->enable_state == WBT_STATE_OFF_DEFAULT)
RQWB(rqos)->enable_state = WBT_STATE_ON_DEFAULT;
+
+ spin_unlock_irq(&q->queue_lock);
return;
}
+ spin_unlock_irq(&q->queue_lock);
/* Queue not registered? Maybe shutting down... */
if (!blk_queue_registered(q))
@@ -692,6 +709,7 @@ static void wbt_exit(struct rq_qos *rqos)
struct rq_wb *rwb = RQWB(rqos);
struct request_queue *q = rqos->q;
+ rq_qos_deactivate(rqos);
blk_stat_remove_callback(q, rwb->cb);
blk_stat_free_callback(rwb->cb);
kfree(rwb);
@@ -702,15 +720,21 @@ static void wbt_exit(struct rq_qos *rqos)
*/
void wbt_disable_default(struct request_queue *q)
{
- struct rq_qos *rqos = wbt_rq_qos(q);
+ struct rq_qos *rqos;
struct rq_wb *rwb;
+
+ spin_lock_irq(&q->queue_lock);
+ rqos = wbt_rq_qos(q);
if (!rqos)
- return;
+ goto out;
+
rwb = RQWB(rqos);
if (rwb->enable_state == WBT_STATE_ON_DEFAULT) {
blk_stat_deactivate(rwb->cb);
rwb->enable_state = WBT_STATE_OFF_DEFAULT;
}
+out:
+ spin_unlock_irq(&q->queue_lock);
}
EXPORT_SYMBOL_GPL(wbt_disable_default);
@@ -803,6 +827,7 @@ static const struct blk_mq_debugfs_attr wbt_debugfs_attrs[] = {
#endif
static struct rq_qos_ops wbt_rqos_ops = {
+ .name = "blk-wbt",
.throttle = wbt_wait,
.issue = wbt_issue,
.track = wbt_track,
@@ -811,6 +836,7 @@ static struct rq_qos_ops wbt_rqos_ops = {
.cleanup = wbt_cleanup,
.queue_depth_changed = wbt_queue_depth_changed,
.exit = wbt_exit,
+ .init = wbt_init,
#ifdef CONFIG_BLK_DEBUG_FS
.debugfs_attrs = wbt_debugfs_attrs,
#endif
@@ -834,9 +860,6 @@ int wbt_init(struct request_queue *q)
for (i = 0; i < WBT_NUM_RWQ; i++)
rq_wait_init(&rwb->rq_wait[i]);
- rwb->rqos.id = RQ_QOS_WBT;
- rwb->rqos.ops = &wbt_rqos_ops;
- rwb->rqos.q = q;
rwb->last_comp = rwb->last_issue = jiffies;
rwb->win_nsec = RWB_WINDOW_NSEC;
rwb->enable_state = WBT_STATE_ON_DEFAULT;
@@ -846,7 +869,7 @@ int wbt_init(struct request_queue *q)
/*
* Assign rwb and add the stats callback.
*/
- rq_qos_add(q, &rwb->rqos);
+ rq_qos_activate(q, &rwb->rqos, &wbt_rqos_ops);
blk_stat_add_callback(q, rwb->cb);
rwb->min_lat_nsec = wbt_default_latency_nsec(q);
@@ -856,3 +879,15 @@ int wbt_init(struct request_queue *q)
return 0;
}
+
+static __init int wbt_mod_init(void)
+{
+ return rq_qos_register(&wbt_rqos_ops);
+}
+
+static __exit void wbt_mod_exit(void)
+{
+ return rq_qos_unregister(&wbt_rqos_ops);
+}
+module_init(wbt_mod_init);
+module_exit(wbt_mod_exit);
diff --git a/block/blk-wbt.h b/block/blk-wbt.h
index 2eb01becde8c..e0d051cb00f7 100644
--- a/block/blk-wbt.h
+++ b/block/blk-wbt.h
@@ -88,6 +88,7 @@ static inline unsigned int wbt_inflight(struct rq_wb *rwb)
#ifdef CONFIG_BLK_WBT
+struct rq_qos *wbt_rq_qos(struct request_queue *q);
int wbt_init(struct request_queue *);
void wbt_disable_default(struct request_queue *);
void wbt_enable_default(struct request_queue *);
@@ -101,6 +102,11 @@ u64 wbt_default_latency_nsec(struct request_queue *);
#else
+static inline struct rq_qos *wbt_rq_qos(struct request_queue *q)
+{
+ return NULL;
+}
+
static inline void wbt_track(struct request *rq, enum wbt_flags flags)
{
}
--
2.17.1
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