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Date: Wed, 16 Feb 2022 19:48:07 +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 V3 4/6] blk-iocost: make iocost pluggable
Make blk-iocost pluggable. Then we can close or open it through
/sys/block/xxx/queue/qos.
Signed-off-by: Wang Jianchao (Kuaishou) <jianchao.wan9@...il.com>
---
block/blk-iocost.c | 49 ++++++++++++++++++++++++++----------------
block/blk-mq-debugfs.c | 2 --
block/blk-rq-qos.h | 1 -
3 files changed, 30 insertions(+), 22 deletions(-)
diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 769b64394298..73978b540e37 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -660,9 +660,10 @@ static struct ioc *rqos_to_ioc(struct rq_qos *rqos)
return container_of(rqos, struct ioc, rqos);
}
+static struct rq_qos_ops ioc_rqos_ops;
static struct ioc *q_to_ioc(struct request_queue *q)
{
- return rqos_to_ioc(rq_qos_id(q, RQ_QOS_COST));
+ return rqos_to_ioc(rq_qos_by_id(q, ioc_rqos_ops.id));
}
static const char *q_name(struct request_queue *q)
@@ -2810,6 +2811,7 @@ static void ioc_rqos_exit(struct rq_qos *rqos)
struct ioc *ioc = rqos_to_ioc(rqos);
blkcg_deactivate_policy(rqos->q, &blkcg_policy_iocost);
+ rq_qos_deactivate(rqos);
spin_lock_irq(&ioc->lock);
ioc->running = IOC_STOP;
@@ -2820,13 +2822,17 @@ static void ioc_rqos_exit(struct rq_qos *rqos)
kfree(ioc);
}
+static int blk_iocost_init(struct request_queue *q);
static struct rq_qos_ops ioc_rqos_ops = {
+ .name = "iocost",
+ .flags = RQOS_FLAG_CGRP_POL,
.throttle = ioc_rqos_throttle,
.merge = ioc_rqos_merge,
.done_bio = ioc_rqos_done_bio,
.done = ioc_rqos_done,
.queue_depth_changed = ioc_rqos_queue_depth_changed,
.exit = ioc_rqos_exit,
+ .init = blk_iocost_init,
};
static int blk_iocost_init(struct request_queue *q)
@@ -2856,10 +2862,7 @@ static int blk_iocost_init(struct request_queue *q)
}
rqos = &ioc->rqos;
- rqos->id = RQ_QOS_COST;
- rqos->ops = &ioc_rqos_ops;
- rqos->q = q;
-
+ rq_qos_activate(q, rqos, &ioc_rqos_ops);
spin_lock_init(&ioc->lock);
timer_setup(&ioc->timer, ioc_timer_fn, 0);
INIT_LIST_HEAD(&ioc->active_iocgs);
@@ -2883,10 +2886,9 @@ static int blk_iocost_init(struct request_queue *q)
* called before policy activation completion, can't assume that the
* target bio has an iocg associated and need to test for NULL iocg.
*/
- rq_qos_add(q, rqos);
ret = blkcg_activate_policy(q, &blkcg_policy_iocost);
if (ret) {
- rq_qos_del(q, rqos);
+ rq_qos_deactivate(rqos);
free_percpu(ioc->pcpu_stat);
kfree(ioc);
return ret;
@@ -3162,6 +3164,7 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
size_t nbytes, loff_t off)
{
struct block_device *bdev;
+ struct rq_qos *rqos;
struct ioc *ioc;
u32 qos[NR_QOS_PARAMS];
bool enable, user;
@@ -3172,12 +3175,10 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
if (IS_ERR(bdev))
return PTR_ERR(bdev);
- ioc = q_to_ioc(bdev_get_queue(bdev));
- if (!ioc) {
- ret = blk_iocost_init(bdev_get_queue(bdev));
- if (ret)
- goto err;
- ioc = q_to_ioc(bdev_get_queue(bdev));
+ rqos = rq_qos_get(bdev_get_queue(bdev), ioc_rqos_ops.id);
+ if (!rqos) {
+ ret = -EOPNOTSUPP;
+ goto err;
}
spin_lock_irq(&ioc->lock);
@@ -3329,6 +3330,7 @@ static ssize_t ioc_cost_model_write(struct kernfs_open_file *of, char *input,
size_t nbytes, loff_t off)
{
struct block_device *bdev;
+ struct rq_qos *rqos;
struct ioc *ioc;
u64 u[NR_I_LCOEFS];
bool user;
@@ -3339,12 +3341,10 @@ static ssize_t ioc_cost_model_write(struct kernfs_open_file *of, char *input,
if (IS_ERR(bdev))
return PTR_ERR(bdev);
- ioc = q_to_ioc(bdev_get_queue(bdev));
+ rqos = rq_qos_get(bdev_get_queue(bdev), ioc_rqos_ops.id);
if (!ioc) {
- ret = blk_iocost_init(bdev_get_queue(bdev));
- if (ret)
- goto err;
- ioc = q_to_ioc(bdev_get_queue(bdev));
+ ret = -EOPNOTSUPP;
+ goto err;
}
spin_lock_irq(&ioc->lock);
@@ -3441,12 +3441,23 @@ static struct blkcg_policy blkcg_policy_iocost = {
static int __init ioc_init(void)
{
- return blkcg_policy_register(&blkcg_policy_iocost);
+ int ret;
+
+ ret = rq_qos_register(&ioc_rqos_ops);
+ if (ret)
+ return ret;
+
+ ret = blkcg_policy_register(&blkcg_policy_iocost);
+ if (ret)
+ rq_qos_unregister(&ioc_rqos_ops);
+
+ return ret;
}
static void __exit ioc_exit(void)
{
blkcg_policy_unregister(&blkcg_policy_iocost);
+ rq_qos_unregister(&ioc_rqos_ops);
}
module_init(ioc_init);
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index ec1f74bdea74..652cd754dbd3 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_COST:
- return "cost";
case RQ_QOS_IOPRIO:
return "ioprio";
}
diff --git a/block/blk-rq-qos.h b/block/blk-rq-qos.h
index 2a919db52fef..6d691527cb51 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_COST,
RQ_QOS_IOPRIO,
};
--
2.17.1
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