forked from mirrors/linux
blk-rq-qos: refactor out common elements of blk-wbt
blkcg-qos is going to do essentially what wbt does, only on a cgroup basis. Break out the common code that will be shared between blkcg-qos and wbt into blk-rq-qos.* so they can both utilize the same infrastructure. Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Josef Bacik
Jens Axboe
parent
2ecbf45635
commit
a79050434b
10 changed files with 480 additions and 253 deletions
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@ -9,7 +9,7 @@ obj-$(CONFIG_BLOCK) := bio.o elevator.o blk-core.o blk-tag.o blk-sysfs.o \
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blk-lib.o blk-mq.o blk-mq-tag.o blk-stat.o \
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blk-mq-sysfs.o blk-mq-cpumap.o blk-mq-sched.o ioctl.o \
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genhd.o partition-generic.o ioprio.o \
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badblocks.o partitions/
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badblocks.o partitions/ blk-rq-qos.o
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obj-$(CONFIG_BOUNCE) += bounce.o
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obj-$(CONFIG_BLK_SCSI_REQUEST) += scsi_ioctl.o
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@ -1645,7 +1645,7 @@ void blk_requeue_request(struct request_queue *q, struct request *rq)
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blk_delete_timer(rq);
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blk_clear_rq_complete(rq);
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trace_block_rq_requeue(q, rq);
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wbt_requeue(q->rq_wb, rq);
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rq_qos_requeue(q, rq);
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if (rq->rq_flags & RQF_QUEUED)
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blk_queue_end_tag(q, rq);
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@ -1752,7 +1752,7 @@ void __blk_put_request(struct request_queue *q, struct request *req)
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/* this is a bio leak */
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WARN_ON(req->bio != NULL);
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wbt_done(q->rq_wb, req);
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rq_qos_done(q, req);
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/*
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* Request may not have originated from ll_rw_blk. if not,
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@ -2044,7 +2044,7 @@ static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio)
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}
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get_rq:
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wb_acct = wbt_wait(q->rq_wb, bio, q->queue_lock);
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wb_acct = rq_qos_throttle(q, bio, q->queue_lock);
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/*
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* Grab a free request. This is might sleep but can not fail.
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@ -2054,7 +2054,7 @@ static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio)
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req = get_request(q, bio->bi_opf, bio, 0, GFP_NOIO);
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if (IS_ERR(req)) {
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blk_queue_exit(q);
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__wbt_done(q->rq_wb, wb_acct);
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rq_qos_cleanup(q, wb_acct);
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if (PTR_ERR(req) == -ENOMEM)
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bio->bi_status = BLK_STS_RESOURCE;
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else
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@ -2983,7 +2983,7 @@ void blk_start_request(struct request *req)
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req->throtl_size = blk_rq_sectors(req);
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#endif
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req->rq_flags |= RQF_STATS;
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wbt_issue(req->q->rq_wb, req);
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rq_qos_issue(req->q, req);
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}
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BUG_ON(blk_rq_is_complete(req));
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@ -3207,7 +3207,7 @@ void blk_finish_request(struct request *req, blk_status_t error)
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blk_account_io_done(req, now);
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if (req->end_io) {
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wbt_done(req->q->rq_wb, req);
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rq_qos_done(q, req);
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req->end_io(req, error);
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} else {
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if (blk_bidi_rq(req))
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@ -504,7 +504,7 @@ void blk_mq_free_request(struct request *rq)
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if (unlikely(laptop_mode && !blk_rq_is_passthrough(rq)))
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laptop_io_completion(q->backing_dev_info);
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wbt_done(q->rq_wb, rq);
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rq_qos_done(q, rq);
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if (blk_rq_rl(rq))
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blk_put_rl(blk_rq_rl(rq));
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@ -527,7 +527,7 @@ inline void __blk_mq_end_request(struct request *rq, blk_status_t error)
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blk_account_io_done(rq, now);
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if (rq->end_io) {
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wbt_done(rq->q->rq_wb, rq);
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rq_qos_done(rq->q, rq);
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rq->end_io(rq, error);
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} else {
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if (unlikely(blk_bidi_rq(rq)))
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@ -641,7 +641,7 @@ void blk_mq_start_request(struct request *rq)
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rq->throtl_size = blk_rq_sectors(rq);
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#endif
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rq->rq_flags |= RQF_STATS;
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wbt_issue(q->rq_wb, rq);
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rq_qos_issue(q, rq);
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}
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WARN_ON_ONCE(blk_mq_rq_state(rq) != MQ_RQ_IDLE);
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@ -667,7 +667,7 @@ static void __blk_mq_requeue_request(struct request *rq)
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blk_mq_put_driver_tag(rq);
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trace_block_rq_requeue(q, rq);
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wbt_requeue(q->rq_wb, rq);
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rq_qos_requeue(q, rq);
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if (blk_mq_request_started(rq)) {
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WRITE_ONCE(rq->state, MQ_RQ_IDLE);
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@ -1806,13 +1806,13 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio)
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if (blk_mq_sched_bio_merge(q, bio))
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return BLK_QC_T_NONE;
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wb_acct = wbt_wait(q->rq_wb, bio, NULL);
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wb_acct = rq_qos_throttle(q, bio, NULL);
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trace_block_getrq(q, bio, bio->bi_opf);
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rq = blk_mq_get_request(q, bio, bio->bi_opf, &data);
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if (unlikely(!rq)) {
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__wbt_done(q->rq_wb, wb_acct);
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rq_qos_cleanup(q, wb_acct);
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if (bio->bi_opf & REQ_NOWAIT)
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bio_wouldblock_error(bio);
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return BLK_QC_T_NONE;
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178
block/blk-rq-qos.c
Normal file
178
block/blk-rq-qos.c
Normal file
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@ -0,0 +1,178 @@
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#include "blk-rq-qos.h"
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#include "blk-wbt.h"
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/*
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* Increment 'v', if 'v' is below 'below'. Returns true if we succeeded,
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* false if 'v' + 1 would be bigger than 'below'.
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*/
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static bool atomic_inc_below(atomic_t *v, int below)
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{
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int cur = atomic_read(v);
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for (;;) {
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int old;
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if (cur >= below)
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return false;
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old = atomic_cmpxchg(v, cur, cur + 1);
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if (old == cur)
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break;
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cur = old;
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}
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return true;
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}
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bool rq_wait_inc_below(struct rq_wait *rq_wait, int limit)
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{
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return atomic_inc_below(&rq_wait->inflight, limit);
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}
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void rq_qos_cleanup(struct request_queue *q, enum wbt_flags wb_acct)
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{
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struct rq_qos *rqos;
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for (rqos = q->rq_qos; rqos; rqos = rqos->next) {
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if (rqos->ops->cleanup)
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rqos->ops->cleanup(rqos, wb_acct);
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}
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}
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void rq_qos_done(struct request_queue *q, struct request *rq)
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{
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struct rq_qos *rqos;
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for (rqos = q->rq_qos; rqos; rqos = rqos->next) {
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if (rqos->ops->done)
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rqos->ops->done(rqos, rq);
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}
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}
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void rq_qos_issue(struct request_queue *q, struct request *rq)
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{
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struct rq_qos *rqos;
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for(rqos = q->rq_qos; rqos; rqos = rqos->next) {
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if (rqos->ops->issue)
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rqos->ops->issue(rqos, rq);
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}
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}
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void rq_qos_requeue(struct request_queue *q, struct request *rq)
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{
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struct rq_qos *rqos;
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for(rqos = q->rq_qos; rqos; rqos = rqos->next) {
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if (rqos->ops->requeue)
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rqos->ops->requeue(rqos, rq);
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}
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}
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enum wbt_flags rq_qos_throttle(struct request_queue *q, struct bio *bio,
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spinlock_t *lock)
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{
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struct rq_qos *rqos;
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enum wbt_flags flags = 0;
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for(rqos = q->rq_qos; rqos; rqos = rqos->next) {
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if (rqos->ops->throttle)
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flags |= rqos->ops->throttle(rqos, bio, lock);
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}
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return flags;
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}
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/*
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* Return true, if we can't increase the depth further by scaling
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*/
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bool rq_depth_calc_max_depth(struct rq_depth *rqd)
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{
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unsigned int depth;
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bool ret = false;
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/*
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* For QD=1 devices, this is a special case. It's important for those
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* to have one request ready when one completes, so force a depth of
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* 2 for those devices. On the backend, it'll be a depth of 1 anyway,
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* since the device can't have more than that in flight. If we're
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* scaling down, then keep a setting of 1/1/1.
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*/
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if (rqd->queue_depth == 1) {
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if (rqd->scale_step > 0)
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rqd->max_depth = 1;
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else {
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rqd->max_depth = 2;
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ret = true;
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}
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} else {
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/*
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* scale_step == 0 is our default state. If we have suffered
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* latency spikes, step will be > 0, and we shrink the
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* allowed write depths. If step is < 0, we're only doing
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* writes, and we allow a temporarily higher depth to
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* increase performance.
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*/
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depth = min_t(unsigned int, rqd->default_depth,
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rqd->queue_depth);
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if (rqd->scale_step > 0)
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depth = 1 + ((depth - 1) >> min(31, rqd->scale_step));
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else if (rqd->scale_step < 0) {
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unsigned int maxd = 3 * rqd->queue_depth / 4;
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depth = 1 + ((depth - 1) << -rqd->scale_step);
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if (depth > maxd) {
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depth = maxd;
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ret = true;
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}
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}
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rqd->max_depth = depth;
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}
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return ret;
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}
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void rq_depth_scale_up(struct rq_depth *rqd)
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{
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/*
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* Hit max in previous round, stop here
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*/
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if (rqd->scaled_max)
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return;
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rqd->scale_step--;
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rqd->scaled_max = rq_depth_calc_max_depth(rqd);
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}
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/*
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* Scale rwb down. If 'hard_throttle' is set, do it quicker, since we
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* had a latency violation.
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*/
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void rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle)
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{
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/*
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* Stop scaling down when we've hit the limit. This also prevents
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* ->scale_step from going to crazy values, if the device can't
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* keep up.
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*/
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if (rqd->max_depth == 1)
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return;
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if (rqd->scale_step < 0 && hard_throttle)
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rqd->scale_step = 0;
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else
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rqd->scale_step++;
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rqd->scaled_max = false;
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rq_depth_calc_max_depth(rqd);
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}
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void rq_qos_exit(struct request_queue *q)
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{
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while (q->rq_qos) {
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struct rq_qos *rqos = q->rq_qos;
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q->rq_qos = rqos->next;
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rqos->ops->exit(rqos);
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}
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}
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106
block/blk-rq-qos.h
Normal file
106
block/blk-rq-qos.h
Normal file
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@ -0,0 +1,106 @@
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#ifndef RQ_QOS_H
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#define RQ_QOS_H
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#include <linux/kernel.h>
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#include <linux/blkdev.h>
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#include <linux/blk_types.h>
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#include <linux/atomic.h>
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#include <linux/wait.h>
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enum rq_qos_id {
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RQ_QOS_WBT,
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RQ_QOS_CGROUP,
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};
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struct rq_wait {
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wait_queue_head_t wait;
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atomic_t inflight;
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};
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struct rq_qos {
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struct rq_qos_ops *ops;
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struct request_queue *q;
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enum rq_qos_id id;
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struct rq_qos *next;
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};
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struct rq_qos_ops {
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enum wbt_flags (*throttle)(struct rq_qos *, struct bio *,
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spinlock_t *);
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void (*issue)(struct rq_qos *, struct request *);
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void (*requeue)(struct rq_qos *, struct request *);
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void (*done)(struct rq_qos *, struct request *);
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void (*cleanup)(struct rq_qos *, enum wbt_flags);
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void (*exit)(struct rq_qos *);
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};
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struct rq_depth {
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unsigned int max_depth;
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int scale_step;
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bool scaled_max;
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unsigned int queue_depth;
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unsigned int default_depth;
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};
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static inline struct rq_qos *rq_qos_id(struct request_queue *q,
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enum rq_qos_id id)
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{
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struct rq_qos *rqos;
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for (rqos = q->rq_qos; rqos; rqos = rqos->next) {
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if (rqos->id == id)
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break;
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}
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return rqos;
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}
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static inline struct rq_qos *wbt_rq_qos(struct request_queue *q)
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{
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return rq_qos_id(q, RQ_QOS_WBT);
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}
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static inline struct rq_qos *blkcg_rq_qos(struct request_queue *q)
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{
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return rq_qos_id(q, RQ_QOS_CGROUP);
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}
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static inline void rq_wait_init(struct rq_wait *rq_wait)
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{
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atomic_set(&rq_wait->inflight, 0);
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init_waitqueue_head(&rq_wait->wait);
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}
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static inline void rq_qos_add(struct request_queue *q, struct rq_qos *rqos)
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{
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rqos->next = q->rq_qos;
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q->rq_qos = rqos;
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}
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static inline void rq_qos_del(struct request_queue *q, struct rq_qos *rqos)
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{
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struct rq_qos *cur, *prev = NULL;
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for (cur = q->rq_qos; cur; cur = cur->next) {
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if (cur == rqos) {
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if (prev)
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prev->next = rqos->next;
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else
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q->rq_qos = cur;
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break;
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}
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prev = cur;
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}
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}
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bool rq_wait_inc_below(struct rq_wait *rq_wait, int limit);
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void rq_depth_scale_up(struct rq_depth *rqd);
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void rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle);
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bool rq_depth_calc_max_depth(struct rq_depth *rqd);
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void rq_qos_cleanup(struct request_queue *, enum wbt_flags);
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void rq_qos_done(struct request_queue *, struct request *);
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void rq_qos_issue(struct request_queue *, struct request *);
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void rq_qos_requeue(struct request_queue *, struct request *);
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enum wbt_flags rq_qos_throttle(struct request_queue *, struct bio *, spinlock_t *);
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void rq_qos_exit(struct request_queue *);
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#endif
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@ -875,7 +875,7 @@ EXPORT_SYMBOL_GPL(blk_queue_flush_queueable);
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void blk_set_queue_depth(struct request_queue *q, unsigned int depth)
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{
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q->queue_depth = depth;
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wbt_set_queue_depth(q->rq_wb, depth);
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wbt_set_queue_depth(q, depth);
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}
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EXPORT_SYMBOL(blk_set_queue_depth);
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@ -900,7 +900,7 @@ void blk_queue_write_cache(struct request_queue *q, bool wc, bool fua)
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queue_flag_clear(QUEUE_FLAG_FUA, q);
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spin_unlock_irq(q->queue_lock);
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wbt_set_write_cache(q->rq_wb, test_bit(QUEUE_FLAG_WC, &q->queue_flags));
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wbt_set_write_cache(q, test_bit(QUEUE_FLAG_WC, &q->queue_flags));
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}
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EXPORT_SYMBOL_GPL(blk_queue_write_cache);
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@ -422,16 +422,16 @@ static ssize_t queue_poll_store(struct request_queue *q, const char *page,
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static ssize_t queue_wb_lat_show(struct request_queue *q, char *page)
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{
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if (!q->rq_wb)
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if (!wbt_rq_qos(q))
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return -EINVAL;
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||||
|
||||
return sprintf(page, "%llu\n", div_u64(q->rq_wb->min_lat_nsec, 1000));
|
||||
return sprintf(page, "%llu\n", div_u64(wbt_get_min_lat(q), 1000));
|
||||
}
|
||||
|
||||
static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page,
|
||||
size_t count)
|
||||
{
|
||||
struct rq_wb *rwb;
|
||||
struct rq_qos *rqos;
|
||||
ssize_t ret;
|
||||
s64 val;
|
||||
|
||||
|
|
@ -441,23 +441,21 @@ static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page,
|
|||
if (val < -1)
|
||||
return -EINVAL;
|
||||
|
||||
rwb = q->rq_wb;
|
||||
if (!rwb) {
|
||||
rqos = wbt_rq_qos(q);
|
||||
if (!rqos) {
|
||||
ret = wbt_init(q);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
rwb = q->rq_wb;
|
||||
if (val == -1)
|
||||
rwb->min_lat_nsec = wbt_default_latency_nsec(q);
|
||||
val = wbt_default_latency_nsec(q);
|
||||
else if (val >= 0)
|
||||
rwb->min_lat_nsec = val * 1000ULL;
|
||||
val *= 1000ULL;
|
||||
|
||||
if (rwb->enable_state == WBT_STATE_ON_DEFAULT)
|
||||
rwb->enable_state = WBT_STATE_ON_MANUAL;
|
||||
wbt_set_min_lat(q, val);
|
||||
|
||||
wbt_update_limits(rwb);
|
||||
wbt_update_limits(q);
|
||||
return count;
|
||||
}
|
||||
|
||||
|
|
@ -964,7 +962,7 @@ void blk_unregister_queue(struct gendisk *disk)
|
|||
kobject_del(&q->kobj);
|
||||
blk_trace_remove_sysfs(disk_to_dev(disk));
|
||||
|
||||
wbt_exit(q);
|
||||
rq_qos_exit(q);
|
||||
|
||||
mutex_lock(&q->sysfs_lock);
|
||||
if (q->request_fn || (q->mq_ops && q->elevator))
|
||||
|
|
|
|||
326
block/blk-wbt.c
326
block/blk-wbt.c
|
|
@ -25,6 +25,7 @@
|
|||
#include <linux/swap.h>
|
||||
|
||||
#include "blk-wbt.h"
|
||||
#include "blk-rq-qos.h"
|
||||
|
||||
#define CREATE_TRACE_POINTS
|
||||
#include <trace/events/wbt.h>
|
||||
|
|
@ -78,28 +79,6 @@ static inline bool rwb_enabled(struct rq_wb *rwb)
|
|||
return rwb && rwb->wb_normal != 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Increment 'v', if 'v' is below 'below'. Returns true if we succeeded,
|
||||
* false if 'v' + 1 would be bigger than 'below'.
|
||||
*/
|
||||
static bool atomic_inc_below(atomic_t *v, int below)
|
||||
{
|
||||
int cur = atomic_read(v);
|
||||
|
||||
for (;;) {
|
||||
int old;
|
||||
|
||||
if (cur >= below)
|
||||
return false;
|
||||
old = atomic_cmpxchg(v, cur, cur + 1);
|
||||
if (old == cur)
|
||||
break;
|
||||
cur = old;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
static void wb_timestamp(struct rq_wb *rwb, unsigned long *var)
|
||||
{
|
||||
if (rwb_enabled(rwb)) {
|
||||
|
|
@ -116,7 +95,7 @@ static void wb_timestamp(struct rq_wb *rwb, unsigned long *var)
|
|||
*/
|
||||
static bool wb_recent_wait(struct rq_wb *rwb)
|
||||
{
|
||||
struct bdi_writeback *wb = &rwb->queue->backing_dev_info->wb;
|
||||
struct bdi_writeback *wb = &rwb->rqos.q->backing_dev_info->wb;
|
||||
|
||||
return time_before(jiffies, wb->dirty_sleep + HZ);
|
||||
}
|
||||
|
|
@ -144,8 +123,9 @@ static void rwb_wake_all(struct rq_wb *rwb)
|
|||
}
|
||||
}
|
||||
|
||||
void __wbt_done(struct rq_wb *rwb, enum wbt_flags wb_acct)
|
||||
static void __wbt_done(struct rq_qos *rqos, enum wbt_flags wb_acct)
|
||||
{
|
||||
struct rq_wb *rwb = RQWB(rqos);
|
||||
struct rq_wait *rqw;
|
||||
int inflight, limit;
|
||||
|
||||
|
|
@ -194,10 +174,9 @@ void __wbt_done(struct rq_wb *rwb, enum wbt_flags wb_acct)
|
|||
* Called on completion of a request. Note that it's also called when
|
||||
* a request is merged, when the request gets freed.
|
||||
*/
|
||||
void wbt_done(struct rq_wb *rwb, struct request *rq)
|
||||
static void wbt_done(struct rq_qos *rqos, struct request *rq)
|
||||
{
|
||||
if (!rwb)
|
||||
return;
|
||||
struct rq_wb *rwb = RQWB(rqos);
|
||||
|
||||
if (!wbt_is_tracked(rq)) {
|
||||
if (rwb->sync_cookie == rq) {
|
||||
|
|
@ -209,72 +188,11 @@ void wbt_done(struct rq_wb *rwb, struct request *rq)
|
|||
wb_timestamp(rwb, &rwb->last_comp);
|
||||
} else {
|
||||
WARN_ON_ONCE(rq == rwb->sync_cookie);
|
||||
__wbt_done(rwb, wbt_flags(rq));
|
||||
__wbt_done(rqos, wbt_flags(rq));
|
||||
}
|
||||
wbt_clear_state(rq);
|
||||
}
|
||||
|
||||
/*
|
||||
* Return true, if we can't increase the depth further by scaling
|
||||
*/
|
||||
static bool calc_wb_limits(struct rq_wb *rwb)
|
||||
{
|
||||
unsigned int depth;
|
||||
bool ret = false;
|
||||
|
||||
if (!rwb->min_lat_nsec) {
|
||||
rwb->wb_max = rwb->wb_normal = rwb->wb_background = 0;
|
||||
return false;
|
||||
}
|
||||
|
||||
/*
|
||||
* For QD=1 devices, this is a special case. It's important for those
|
||||
* to have one request ready when one completes, so force a depth of
|
||||
* 2 for those devices. On the backend, it'll be a depth of 1 anyway,
|
||||
* since the device can't have more than that in flight. If we're
|
||||
* scaling down, then keep a setting of 1/1/1.
|
||||
*/
|
||||
if (rwb->queue_depth == 1) {
|
||||
if (rwb->scale_step > 0)
|
||||
rwb->wb_max = rwb->wb_normal = 1;
|
||||
else {
|
||||
rwb->wb_max = rwb->wb_normal = 2;
|
||||
ret = true;
|
||||
}
|
||||
rwb->wb_background = 1;
|
||||
} else {
|
||||
/*
|
||||
* scale_step == 0 is our default state. If we have suffered
|
||||
* latency spikes, step will be > 0, and we shrink the
|
||||
* allowed write depths. If step is < 0, we're only doing
|
||||
* writes, and we allow a temporarily higher depth to
|
||||
* increase performance.
|
||||
*/
|
||||
depth = min_t(unsigned int, RWB_DEF_DEPTH, rwb->queue_depth);
|
||||
if (rwb->scale_step > 0)
|
||||
depth = 1 + ((depth - 1) >> min(31, rwb->scale_step));
|
||||
else if (rwb->scale_step < 0) {
|
||||
unsigned int maxd = 3 * rwb->queue_depth / 4;
|
||||
|
||||
depth = 1 + ((depth - 1) << -rwb->scale_step);
|
||||
if (depth > maxd) {
|
||||
depth = maxd;
|
||||
ret = true;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Set our max/normal/bg queue depths based on how far
|
||||
* we have scaled down (->scale_step).
|
||||
*/
|
||||
rwb->wb_max = depth;
|
||||
rwb->wb_normal = (rwb->wb_max + 1) / 2;
|
||||
rwb->wb_background = (rwb->wb_max + 3) / 4;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline bool stat_sample_valid(struct blk_rq_stat *stat)
|
||||
{
|
||||
/*
|
||||
|
|
@ -307,7 +225,8 @@ enum {
|
|||
|
||||
static int latency_exceeded(struct rq_wb *rwb, struct blk_rq_stat *stat)
|
||||
{
|
||||
struct backing_dev_info *bdi = rwb->queue->backing_dev_info;
|
||||
struct backing_dev_info *bdi = rwb->rqos.q->backing_dev_info;
|
||||
struct rq_depth *rqd = &rwb->rq_depth;
|
||||
u64 thislat;
|
||||
|
||||
/*
|
||||
|
|
@ -351,7 +270,7 @@ static int latency_exceeded(struct rq_wb *rwb, struct blk_rq_stat *stat)
|
|||
return LAT_EXCEEDED;
|
||||
}
|
||||
|
||||
if (rwb->scale_step)
|
||||
if (rqd->scale_step)
|
||||
trace_wbt_stat(bdi, stat);
|
||||
|
||||
return LAT_OK;
|
||||
|
|
@ -359,58 +278,48 @@ static int latency_exceeded(struct rq_wb *rwb, struct blk_rq_stat *stat)
|
|||
|
||||
static void rwb_trace_step(struct rq_wb *rwb, const char *msg)
|
||||
{
|
||||
struct backing_dev_info *bdi = rwb->queue->backing_dev_info;
|
||||
struct backing_dev_info *bdi = rwb->rqos.q->backing_dev_info;
|
||||
struct rq_depth *rqd = &rwb->rq_depth;
|
||||
|
||||
trace_wbt_step(bdi, msg, rwb->scale_step, rwb->cur_win_nsec,
|
||||
rwb->wb_background, rwb->wb_normal, rwb->wb_max);
|
||||
trace_wbt_step(bdi, msg, rqd->scale_step, rwb->cur_win_nsec,
|
||||
rwb->wb_background, rwb->wb_normal, rqd->max_depth);
|
||||
}
|
||||
|
||||
static void calc_wb_limits(struct rq_wb *rwb)
|
||||
{
|
||||
if (rwb->min_lat_nsec == 0) {
|
||||
rwb->wb_normal = rwb->wb_background = 0;
|
||||
} else if (rwb->rq_depth.max_depth <= 2) {
|
||||
rwb->wb_normal = rwb->rq_depth.max_depth;
|
||||
rwb->wb_background = 1;
|
||||
} else {
|
||||
rwb->wb_normal = (rwb->rq_depth.max_depth + 1) / 2;
|
||||
rwb->wb_background = (rwb->rq_depth.max_depth + 3) / 4;
|
||||
}
|
||||
}
|
||||
|
||||
static void scale_up(struct rq_wb *rwb)
|
||||
{
|
||||
/*
|
||||
* Hit max in previous round, stop here
|
||||
*/
|
||||
if (rwb->scaled_max)
|
||||
return;
|
||||
|
||||
rwb->scale_step--;
|
||||
rq_depth_scale_up(&rwb->rq_depth);
|
||||
calc_wb_limits(rwb);
|
||||
rwb->unknown_cnt = 0;
|
||||
|
||||
rwb->scaled_max = calc_wb_limits(rwb);
|
||||
|
||||
rwb_wake_all(rwb);
|
||||
|
||||
rwb_trace_step(rwb, "step up");
|
||||
rwb_trace_step(rwb, "scale up");
|
||||
}
|
||||
|
||||
/*
|
||||
* Scale rwb down. If 'hard_throttle' is set, do it quicker, since we
|
||||
* had a latency violation.
|
||||
*/
|
||||
static void scale_down(struct rq_wb *rwb, bool hard_throttle)
|
||||
{
|
||||
/*
|
||||
* Stop scaling down when we've hit the limit. This also prevents
|
||||
* ->scale_step from going to crazy values, if the device can't
|
||||
* keep up.
|
||||
*/
|
||||
if (rwb->wb_max == 1)
|
||||
return;
|
||||
|
||||
if (rwb->scale_step < 0 && hard_throttle)
|
||||
rwb->scale_step = 0;
|
||||
else
|
||||
rwb->scale_step++;
|
||||
|
||||
rwb->scaled_max = false;
|
||||
rwb->unknown_cnt = 0;
|
||||
rq_depth_scale_down(&rwb->rq_depth, hard_throttle);
|
||||
calc_wb_limits(rwb);
|
||||
rwb_trace_step(rwb, "step down");
|
||||
rwb->unknown_cnt = 0;
|
||||
rwb_wake_all(rwb);
|
||||
rwb_trace_step(rwb, "scale down");
|
||||
}
|
||||
|
||||
static void rwb_arm_timer(struct rq_wb *rwb)
|
||||
{
|
||||
if (rwb->scale_step > 0) {
|
||||
struct rq_depth *rqd = &rwb->rq_depth;
|
||||
|
||||
if (rqd->scale_step > 0) {
|
||||
/*
|
||||
* We should speed this up, using some variant of a fast
|
||||
* integer inverse square root calculation. Since we only do
|
||||
|
|
@ -418,7 +327,7 @@ static void rwb_arm_timer(struct rq_wb *rwb)
|
|||
* though.
|
||||
*/
|
||||
rwb->cur_win_nsec = div_u64(rwb->win_nsec << 4,
|
||||
int_sqrt((rwb->scale_step + 1) << 8));
|
||||
int_sqrt((rqd->scale_step + 1) << 8));
|
||||
} else {
|
||||
/*
|
||||
* For step < 0, we don't want to increase/decrease the
|
||||
|
|
@ -433,12 +342,13 @@ static void rwb_arm_timer(struct rq_wb *rwb)
|
|||
static void wb_timer_fn(struct blk_stat_callback *cb)
|
||||
{
|
||||
struct rq_wb *rwb = cb->data;
|
||||
struct rq_depth *rqd = &rwb->rq_depth;
|
||||
unsigned int inflight = wbt_inflight(rwb);
|
||||
int status;
|
||||
|
||||
status = latency_exceeded(rwb, cb->stat);
|
||||
|
||||
trace_wbt_timer(rwb->queue->backing_dev_info, status, rwb->scale_step,
|
||||
trace_wbt_timer(rwb->rqos.q->backing_dev_info, status, rqd->scale_step,
|
||||
inflight);
|
||||
|
||||
/*
|
||||
|
|
@ -469,9 +379,9 @@ static void wb_timer_fn(struct blk_stat_callback *cb)
|
|||
* currently don't have a valid read/write sample. For that
|
||||
* case, slowly return to center state (step == 0).
|
||||
*/
|
||||
if (rwb->scale_step > 0)
|
||||
if (rqd->scale_step > 0)
|
||||
scale_up(rwb);
|
||||
else if (rwb->scale_step < 0)
|
||||
else if (rqd->scale_step < 0)
|
||||
scale_down(rwb, false);
|
||||
break;
|
||||
default:
|
||||
|
|
@ -481,19 +391,50 @@ static void wb_timer_fn(struct blk_stat_callback *cb)
|
|||
/*
|
||||
* Re-arm timer, if we have IO in flight
|
||||
*/
|
||||
if (rwb->scale_step || inflight)
|
||||
if (rqd->scale_step || inflight)
|
||||
rwb_arm_timer(rwb);
|
||||
}
|
||||
|
||||
void wbt_update_limits(struct rq_wb *rwb)
|
||||
static void __wbt_update_limits(struct rq_wb *rwb)
|
||||
{
|
||||
rwb->scale_step = 0;
|
||||
rwb->scaled_max = false;
|
||||
struct rq_depth *rqd = &rwb->rq_depth;
|
||||
|
||||
rqd->scale_step = 0;
|
||||
rqd->scaled_max = false;
|
||||
|
||||
rq_depth_calc_max_depth(rqd);
|
||||
calc_wb_limits(rwb);
|
||||
|
||||
rwb_wake_all(rwb);
|
||||
}
|
||||
|
||||
void wbt_update_limits(struct request_queue *q)
|
||||
{
|
||||
struct rq_qos *rqos = wbt_rq_qos(q);
|
||||
if (!rqos)
|
||||
return;
|
||||
__wbt_update_limits(RQWB(rqos));
|
||||
}
|
||||
|
||||
u64 wbt_get_min_lat(struct request_queue *q)
|
||||
{
|
||||
struct rq_qos *rqos = wbt_rq_qos(q);
|
||||
if (!rqos)
|
||||
return 0;
|
||||
return RQWB(rqos)->min_lat_nsec;
|
||||
}
|
||||
|
||||
void wbt_set_min_lat(struct request_queue *q, u64 val)
|
||||
{
|
||||
struct rq_qos *rqos = wbt_rq_qos(q);
|
||||
if (!rqos)
|
||||
return;
|
||||
RQWB(rqos)->min_lat_nsec = val;
|
||||
RQWB(rqos)->enable_state = WBT_STATE_ON_MANUAL;
|
||||
__wbt_update_limits(RQWB(rqos));
|
||||
}
|
||||
|
||||
|
||||
static bool close_io(struct rq_wb *rwb)
|
||||
{
|
||||
const unsigned long now = jiffies;
|
||||
|
|
@ -520,7 +461,7 @@ static inline unsigned int get_limit(struct rq_wb *rwb, unsigned long rw)
|
|||
* IO for a bit.
|
||||
*/
|
||||
if ((rw & REQ_HIPRIO) || wb_recent_wait(rwb) || current_is_kswapd())
|
||||
limit = rwb->wb_max;
|
||||
limit = rwb->rq_depth.max_depth;
|
||||
else if ((rw & REQ_BACKGROUND) || close_io(rwb)) {
|
||||
/*
|
||||
* If less than 100ms since we completed unrelated IO,
|
||||
|
|
@ -554,7 +495,7 @@ static inline bool may_queue(struct rq_wb *rwb, struct rq_wait *rqw,
|
|||
rqw->wait.head.next != &wait->entry)
|
||||
return false;
|
||||
|
||||
return atomic_inc_below(&rqw->inflight, get_limit(rwb, rw));
|
||||
return rq_wait_inc_below(rqw, get_limit(rwb, rw));
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -614,8 +555,10 @@ static inline bool wbt_should_throttle(struct rq_wb *rwb, struct bio *bio)
|
|||
* in an irq held spinlock, if it holds one when calling this function.
|
||||
* If we do sleep, we'll release and re-grab it.
|
||||
*/
|
||||
enum wbt_flags wbt_wait(struct rq_wb *rwb, struct bio *bio, spinlock_t *lock)
|
||||
static enum wbt_flags wbt_wait(struct rq_qos *rqos, struct bio *bio,
|
||||
spinlock_t *lock)
|
||||
{
|
||||
struct rq_wb *rwb = RQWB(rqos);
|
||||
enum wbt_flags ret = 0;
|
||||
|
||||
if (!rwb_enabled(rwb))
|
||||
|
|
@ -643,8 +586,10 @@ enum wbt_flags wbt_wait(struct rq_wb *rwb, struct bio *bio, spinlock_t *lock)
|
|||
return ret | WBT_TRACKED;
|
||||
}
|
||||
|
||||
void wbt_issue(struct rq_wb *rwb, struct request *rq)
|
||||
void wbt_issue(struct rq_qos *rqos, struct request *rq)
|
||||
{
|
||||
struct rq_wb *rwb = RQWB(rqos);
|
||||
|
||||
if (!rwb_enabled(rwb))
|
||||
return;
|
||||
|
||||
|
|
@ -661,8 +606,9 @@ void wbt_issue(struct rq_wb *rwb, struct request *rq)
|
|||
}
|
||||
}
|
||||
|
||||
void wbt_requeue(struct rq_wb *rwb, struct request *rq)
|
||||
void wbt_requeue(struct rq_qos *rqos, struct request *rq)
|
||||
{
|
||||
struct rq_wb *rwb = RQWB(rqos);
|
||||
if (!rwb_enabled(rwb))
|
||||
return;
|
||||
if (rq == rwb->sync_cookie) {
|
||||
|
|
@ -671,39 +617,30 @@ void wbt_requeue(struct rq_wb *rwb, struct request *rq)
|
|||
}
|
||||
}
|
||||
|
||||
void wbt_set_queue_depth(struct rq_wb *rwb, unsigned int depth)
|
||||
void wbt_set_queue_depth(struct request_queue *q, unsigned int depth)
|
||||
{
|
||||
if (rwb) {
|
||||
rwb->queue_depth = depth;
|
||||
wbt_update_limits(rwb);
|
||||
struct rq_qos *rqos = wbt_rq_qos(q);
|
||||
if (rqos) {
|
||||
RQWB(rqos)->rq_depth.queue_depth = depth;
|
||||
__wbt_update_limits(RQWB(rqos));
|
||||
}
|
||||
}
|
||||
|
||||
void wbt_set_write_cache(struct rq_wb *rwb, bool write_cache_on)
|
||||
void wbt_set_write_cache(struct request_queue *q, bool write_cache_on)
|
||||
{
|
||||
if (rwb)
|
||||
rwb->wc = write_cache_on;
|
||||
struct rq_qos *rqos = wbt_rq_qos(q);
|
||||
if (rqos)
|
||||
RQWB(rqos)->wc = write_cache_on;
|
||||
}
|
||||
|
||||
/*
|
||||
* Disable wbt, if enabled by default.
|
||||
*/
|
||||
void wbt_disable_default(struct request_queue *q)
|
||||
{
|
||||
struct rq_wb *rwb = q->rq_wb;
|
||||
|
||||
if (rwb && rwb->enable_state == WBT_STATE_ON_DEFAULT)
|
||||
wbt_exit(q);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(wbt_disable_default);
|
||||
|
||||
/*
|
||||
* Enable wbt if defaults are configured that way
|
||||
*/
|
||||
void wbt_enable_default(struct request_queue *q)
|
||||
{
|
||||
struct rq_qos *rqos = wbt_rq_qos(q);
|
||||
/* Throttling already enabled? */
|
||||
if (q->rq_wb)
|
||||
if (rqos)
|
||||
return;
|
||||
|
||||
/* Queue not registered? Maybe shutting down... */
|
||||
|
|
@ -741,6 +678,41 @@ static int wbt_data_dir(const struct request *rq)
|
|||
return -1;
|
||||
}
|
||||
|
||||
static void wbt_exit(struct rq_qos *rqos)
|
||||
{
|
||||
struct rq_wb *rwb = RQWB(rqos);
|
||||
struct request_queue *q = rqos->q;
|
||||
|
||||
blk_stat_remove_callback(q, rwb->cb);
|
||||
blk_stat_free_callback(rwb->cb);
|
||||
kfree(rwb);
|
||||
}
|
||||
|
||||
/*
|
||||
* Disable wbt, if enabled by default.
|
||||
*/
|
||||
void wbt_disable_default(struct request_queue *q)
|
||||
{
|
||||
struct rq_qos *rqos = wbt_rq_qos(q);
|
||||
struct rq_wb *rwb;
|
||||
if (!rqos)
|
||||
return;
|
||||
rwb = RQWB(rqos);
|
||||
if (rwb->enable_state == WBT_STATE_ON_DEFAULT)
|
||||
rwb->wb_normal = 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(wbt_disable_default);
|
||||
|
||||
|
||||
static struct rq_qos_ops wbt_rqos_ops = {
|
||||
.throttle = wbt_wait,
|
||||
.issue = wbt_issue,
|
||||
.requeue = wbt_requeue,
|
||||
.done = wbt_done,
|
||||
.cleanup = __wbt_done,
|
||||
.exit = wbt_exit,
|
||||
};
|
||||
|
||||
int wbt_init(struct request_queue *q)
|
||||
{
|
||||
struct rq_wb *rwb;
|
||||
|
|
@ -756,39 +728,29 @@ int wbt_init(struct request_queue *q)
|
|||
return -ENOMEM;
|
||||
}
|
||||
|
||||
for (i = 0; i < WBT_NUM_RWQ; i++) {
|
||||
atomic_set(&rwb->rq_wait[i].inflight, 0);
|
||||
init_waitqueue_head(&rwb->rq_wait[i].wait);
|
||||
}
|
||||
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->queue = q;
|
||||
rwb->win_nsec = RWB_WINDOW_NSEC;
|
||||
rwb->enable_state = WBT_STATE_ON_DEFAULT;
|
||||
wbt_update_limits(rwb);
|
||||
rwb->wc = 1;
|
||||
rwb->rq_depth.default_depth = RWB_DEF_DEPTH;
|
||||
__wbt_update_limits(rwb);
|
||||
|
||||
/*
|
||||
* Assign rwb and add the stats callback.
|
||||
*/
|
||||
q->rq_wb = rwb;
|
||||
rq_qos_add(q, &rwb->rqos);
|
||||
blk_stat_add_callback(q, rwb->cb);
|
||||
|
||||
rwb->min_lat_nsec = wbt_default_latency_nsec(q);
|
||||
|
||||
wbt_set_queue_depth(rwb, blk_queue_depth(q));
|
||||
wbt_set_write_cache(rwb, test_bit(QUEUE_FLAG_WC, &q->queue_flags));
|
||||
wbt_set_queue_depth(q, blk_queue_depth(q));
|
||||
wbt_set_write_cache(q, test_bit(QUEUE_FLAG_WC, &q->queue_flags));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void wbt_exit(struct request_queue *q)
|
||||
{
|
||||
struct rq_wb *rwb = q->rq_wb;
|
||||
|
||||
if (rwb) {
|
||||
blk_stat_remove_callback(q, rwb->cb);
|
||||
blk_stat_free_callback(rwb->cb);
|
||||
q->rq_wb = NULL;
|
||||
kfree(rwb);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -9,6 +9,7 @@
|
|||
#include <linux/ktime.h>
|
||||
|
||||
#include "blk-stat.h"
|
||||
#include "blk-rq-qos.h"
|
||||
|
||||
enum wbt_flags {
|
||||
WBT_TRACKED = 1, /* write, tracked for throttling */
|
||||
|
|
@ -35,20 +36,12 @@ enum {
|
|||
WBT_STATE_ON_MANUAL = 2,
|
||||
};
|
||||
|
||||
struct rq_wait {
|
||||
wait_queue_head_t wait;
|
||||
atomic_t inflight;
|
||||
};
|
||||
|
||||
struct rq_wb {
|
||||
/*
|
||||
* Settings that govern how we throttle
|
||||
*/
|
||||
unsigned int wb_background; /* background writeback */
|
||||
unsigned int wb_normal; /* normal writeback */
|
||||
unsigned int wb_max; /* max throughput writeback */
|
||||
int scale_step;
|
||||
bool scaled_max;
|
||||
|
||||
short enable_state; /* WBT_STATE_* */
|
||||
|
||||
|
|
@ -67,15 +60,20 @@ struct rq_wb {
|
|||
void *sync_cookie;
|
||||
|
||||
unsigned int wc;
|
||||
unsigned int queue_depth;
|
||||
|
||||
unsigned long last_issue; /* last non-throttled issue */
|
||||
unsigned long last_comp; /* last non-throttled comp */
|
||||
unsigned long min_lat_nsec;
|
||||
struct request_queue *queue;
|
||||
struct rq_qos rqos;
|
||||
struct rq_wait rq_wait[WBT_NUM_RWQ];
|
||||
struct rq_depth rq_depth;
|
||||
};
|
||||
|
||||
static inline struct rq_wb *RQWB(struct rq_qos *rqos)
|
||||
{
|
||||
return container_of(rqos, struct rq_wb, rqos);
|
||||
}
|
||||
|
||||
static inline unsigned int wbt_inflight(struct rq_wb *rwb)
|
||||
{
|
||||
unsigned int i, ret = 0;
|
||||
|
|
@ -86,6 +84,7 @@ static inline unsigned int wbt_inflight(struct rq_wb *rwb)
|
|||
return ret;
|
||||
}
|
||||
|
||||
|
||||
#ifdef CONFIG_BLK_WBT
|
||||
|
||||
static inline void wbt_track(struct request *rq, enum wbt_flags flags)
|
||||
|
|
@ -93,19 +92,16 @@ static inline void wbt_track(struct request *rq, enum wbt_flags flags)
|
|||
rq->wbt_flags |= flags;
|
||||
}
|
||||
|
||||
void __wbt_done(struct rq_wb *, enum wbt_flags);
|
||||
void wbt_done(struct rq_wb *, struct request *);
|
||||
enum wbt_flags wbt_wait(struct rq_wb *, struct bio *, spinlock_t *);
|
||||
int wbt_init(struct request_queue *);
|
||||
void wbt_exit(struct request_queue *);
|
||||
void wbt_update_limits(struct rq_wb *);
|
||||
void wbt_requeue(struct rq_wb *, struct request *);
|
||||
void wbt_issue(struct rq_wb *, struct request *);
|
||||
void wbt_update_limits(struct request_queue *);
|
||||
void wbt_disable_default(struct request_queue *);
|
||||
void wbt_enable_default(struct request_queue *);
|
||||
|
||||
void wbt_set_queue_depth(struct rq_wb *, unsigned int);
|
||||
void wbt_set_write_cache(struct rq_wb *, bool);
|
||||
u64 wbt_get_min_lat(struct request_queue *q);
|
||||
void wbt_set_min_lat(struct request_queue *q, u64 val);
|
||||
|
||||
void wbt_set_queue_depth(struct request_queue *, unsigned int);
|
||||
void wbt_set_write_cache(struct request_queue *, bool);
|
||||
|
||||
u64 wbt_default_latency_nsec(struct request_queue *);
|
||||
|
||||
|
|
@ -114,31 +110,11 @@ u64 wbt_default_latency_nsec(struct request_queue *);
|
|||
static inline void wbt_track(struct request *rq, enum wbt_flags flags)
|
||||
{
|
||||
}
|
||||
static inline void __wbt_done(struct rq_wb *rwb, enum wbt_flags flags)
|
||||
{
|
||||
}
|
||||
static inline void wbt_done(struct rq_wb *rwb, struct request *rq)
|
||||
{
|
||||
}
|
||||
static inline enum wbt_flags wbt_wait(struct rq_wb *rwb, struct bio *bio,
|
||||
spinlock_t *lock)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
static inline int wbt_init(struct request_queue *q)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
static inline void wbt_exit(struct request_queue *q)
|
||||
{
|
||||
}
|
||||
static inline void wbt_update_limits(struct rq_wb *rwb)
|
||||
{
|
||||
}
|
||||
static inline void wbt_requeue(struct rq_wb *rwb, struct request *rq)
|
||||
{
|
||||
}
|
||||
static inline void wbt_issue(struct rq_wb *rwb, struct request *rq)
|
||||
static inline void wbt_update_limits(struct request_queue *q)
|
||||
{
|
||||
}
|
||||
static inline void wbt_disable_default(struct request_queue *q)
|
||||
|
|
@ -147,10 +123,17 @@ static inline void wbt_disable_default(struct request_queue *q)
|
|||
static inline void wbt_enable_default(struct request_queue *q)
|
||||
{
|
||||
}
|
||||
static inline void wbt_set_queue_depth(struct rq_wb *rwb, unsigned int depth)
|
||||
static inline void wbt_set_queue_depth(struct request_queue *q, unsigned int depth)
|
||||
{
|
||||
}
|
||||
static inline void wbt_set_write_cache(struct rq_wb *rwb, bool wc)
|
||||
static inline void wbt_set_write_cache(struct request_queue *q, bool wc)
|
||||
{
|
||||
}
|
||||
static inline u64 wbt_get_min_lat(struct request_queue *q)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
static inline void wbt_set_min_lat(struct request_queue *q, u64 val)
|
||||
{
|
||||
}
|
||||
static inline u64 wbt_default_latency_nsec(struct request_queue *q)
|
||||
|
|
|
|||
|
|
@ -42,7 +42,7 @@ struct bsg_job;
|
|||
struct blkcg_gq;
|
||||
struct blk_flush_queue;
|
||||
struct pr_ops;
|
||||
struct rq_wb;
|
||||
struct rq_qos;
|
||||
struct blk_queue_stats;
|
||||
struct blk_stat_callback;
|
||||
|
||||
|
|
@ -443,7 +443,7 @@ struct request_queue {
|
|||
int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */
|
||||
|
||||
struct blk_queue_stats *stats;
|
||||
struct rq_wb *rq_wb;
|
||||
struct rq_qos *rq_qos;
|
||||
|
||||
/*
|
||||
* If blkcg is not used, @q->root_rl serves all requests. If blkcg
|
||||
|
|
|
|||
Loading…
Reference in a new issue