summaryrefslogtreecommitdiffstats
path: root/block/blk-throttle.c
diff options
context:
space:
mode:
Diffstat (limited to 'block/blk-throttle.c')
-rw-r--r--block/blk-throttle.c100
1 files changed, 51 insertions, 49 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 9660ec8d0375..ebaaaa9f57d6 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -284,17 +284,18 @@ static struct throtl_grp *throtl_lookup_create_tg(struct throtl_data *td,
return tg;
}
-static struct throtl_grp *throtl_rb_first(struct throtl_service_queue *sq)
+static struct throtl_grp *
+throtl_rb_first(struct throtl_service_queue *parent_sq)
{
/* Service tree is empty */
- if (!sq->nr_pending)
+ if (!parent_sq->nr_pending)
return NULL;
- if (!sq->first_pending)
- sq->first_pending = rb_first(&sq->pending_tree);
+ if (!parent_sq->first_pending)
+ parent_sq->first_pending = rb_first(&parent_sq->pending_tree);
- if (sq->first_pending)
- return rb_entry_tg(sq->first_pending);
+ if (parent_sq->first_pending)
+ return rb_entry_tg(parent_sq->first_pending);
return NULL;
}
@@ -305,29 +306,30 @@ static void rb_erase_init(struct rb_node *n, struct rb_root *root)
RB_CLEAR_NODE(n);
}
-static void throtl_rb_erase(struct rb_node *n, struct throtl_service_queue *sq)
+static void throtl_rb_erase(struct rb_node *n,
+ struct throtl_service_queue *parent_sq)
{
- if (sq->first_pending == n)
- sq->first_pending = NULL;
- rb_erase_init(n, &sq->pending_tree);
- --sq->nr_pending;
+ if (parent_sq->first_pending == n)
+ parent_sq->first_pending = NULL;
+ rb_erase_init(n, &parent_sq->pending_tree);
+ --parent_sq->nr_pending;
}
-static void update_min_dispatch_time(struct throtl_service_queue *sq)
+static void update_min_dispatch_time(struct throtl_service_queue *parent_sq)
{
struct throtl_grp *tg;
- tg = throtl_rb_first(sq);
+ tg = throtl_rb_first(parent_sq);
if (!tg)
return;
- sq->first_pending_disptime = tg->disptime;
+ parent_sq->first_pending_disptime = tg->disptime;
}
-static void tg_service_queue_add(struct throtl_service_queue *sq,
- struct throtl_grp *tg)
+static void tg_service_queue_add(struct throtl_grp *tg,
+ struct throtl_service_queue *parent_sq)
{
- struct rb_node **node = &sq->pending_tree.rb_node;
+ struct rb_node **node = &parent_sq->pending_tree.rb_node;
struct rb_node *parent = NULL;
struct throtl_grp *__tg;
unsigned long key = tg->disptime;
@@ -346,39 +348,39 @@ static void tg_service_queue_add(struct throtl_service_queue *sq,
}
if (left)
- sq->first_pending = &tg->rb_node;
+ parent_sq->first_pending = &tg->rb_node;
rb_link_node(&tg->rb_node, parent, node);
- rb_insert_color(&tg->rb_node, &sq->pending_tree);
+ rb_insert_color(&tg->rb_node, &parent_sq->pending_tree);
}
-static void __throtl_enqueue_tg(struct throtl_service_queue *sq,
- struct throtl_grp *tg)
+static void __throtl_enqueue_tg(struct throtl_grp *tg,
+ struct throtl_service_queue *parent_sq)
{
- tg_service_queue_add(sq, tg);
+ tg_service_queue_add(tg, parent_sq);
tg->flags |= THROTL_TG_PENDING;
- sq->nr_pending++;
+ parent_sq->nr_pending++;
}
-static void throtl_enqueue_tg(struct throtl_service_queue *sq,
- struct throtl_grp *tg)
+static void throtl_enqueue_tg(struct throtl_grp *tg,
+ struct throtl_service_queue *parent_sq)
{
if (!(tg->flags & THROTL_TG_PENDING))
- __throtl_enqueue_tg(sq, tg);
+ __throtl_enqueue_tg(tg, parent_sq);
}
-static void __throtl_dequeue_tg(struct throtl_service_queue *sq,
- struct throtl_grp *tg)
+static void __throtl_dequeue_tg(struct throtl_grp *tg,
+ struct throtl_service_queue *parent_sq)
{
- throtl_rb_erase(&tg->rb_node, sq);
+ throtl_rb_erase(&tg->rb_node, parent_sq);
tg->flags &= ~THROTL_TG_PENDING;
}
-static void throtl_dequeue_tg(struct throtl_service_queue *sq,
- struct throtl_grp *tg)
+static void throtl_dequeue_tg(struct throtl_grp *tg,
+ struct throtl_service_queue *parent_sq)
{
if (tg->flags & THROTL_TG_PENDING)
- __throtl_dequeue_tg(sq, tg);
+ __throtl_dequeue_tg(tg, parent_sq);
}
/* Call with queue lock held */
@@ -691,8 +693,8 @@ static void throtl_charge_bio(struct throtl_grp *tg, struct bio *bio)
throtl_update_dispatch_stats(tg_to_blkg(tg), bio->bi_size, bio->bi_rw);
}
-static void throtl_add_bio_tg(struct throtl_service_queue *sq,
- struct throtl_grp *tg, struct bio *bio)
+static void throtl_add_bio_tg(struct bio *bio, struct throtl_grp *tg,
+ struct throtl_service_queue *parent_sq)
{
bool rw = bio_data_dir(bio);
@@ -701,11 +703,11 @@ static void throtl_add_bio_tg(struct throtl_service_queue *sq,
blkg_get(tg_to_blkg(tg));
tg->nr_queued[rw]++;
tg->td->nr_queued[rw]++;
- throtl_enqueue_tg(sq, tg);
+ throtl_enqueue_tg(tg, parent_sq);
}
-static void tg_update_disptime(struct throtl_service_queue *sq,
- struct throtl_grp *tg)
+static void tg_update_disptime(struct throtl_grp *tg,
+ struct throtl_service_queue *parent_sq)
{
unsigned long read_wait = -1, write_wait = -1, min_wait = -1, disptime;
struct bio *bio;
@@ -720,9 +722,9 @@ static void tg_update_disptime(struct throtl_service_queue *sq,
disptime = jiffies + min_wait;
/* Update dispatch time */
- throtl_dequeue_tg(sq, tg);
+ throtl_dequeue_tg(tg, parent_sq);
tg->disptime = disptime;
- throtl_enqueue_tg(sq, tg);
+ throtl_enqueue_tg(tg, parent_sq);
}
static void tg_dispatch_one_bio(struct throtl_grp *tg, bool rw,
@@ -777,14 +779,14 @@ static int throtl_dispatch_tg(struct throtl_grp *tg, struct bio_list *bl)
return nr_reads + nr_writes;
}
-static int throtl_select_dispatch(struct throtl_service_queue *sq,
+static int throtl_select_dispatch(struct throtl_service_queue *parent_sq,
struct bio_list *bl)
{
unsigned int nr_disp = 0;
struct throtl_grp *tg;
while (1) {
- tg = throtl_rb_first(sq);
+ tg = throtl_rb_first(parent_sq);
if (!tg)
break;
@@ -792,12 +794,12 @@ static int throtl_select_dispatch(struct throtl_service_queue *sq,
if (time_before(jiffies, tg->disptime))
break;
- throtl_dequeue_tg(sq, tg);
+ throtl_dequeue_tg(tg, parent_sq);
nr_disp += throtl_dispatch_tg(tg, bl);
if (tg->nr_queued[0] || tg->nr_queued[1])
- tg_update_disptime(sq, tg);
+ tg_update_disptime(tg, parent_sq);
if (nr_disp >= throtl_quantum)
break;
@@ -952,7 +954,7 @@ static int tg_set_conf(struct cgroup *cgrp, struct cftype *cft, const char *buf,
throtl_start_new_slice(tg, 1);
if (tg->flags & THROTL_TG_PENDING) {
- tg_update_disptime(&td->service_queue, tg);
+ tg_update_disptime(tg, &td->service_queue);
throtl_schedule_next_dispatch(td);
}
@@ -1106,11 +1108,11 @@ queue_bio:
tg->nr_queued[READ], tg->nr_queued[WRITE]);
bio_associate_current(bio);
- throtl_add_bio_tg(&q->td->service_queue, tg, bio);
+ throtl_add_bio_tg(bio, tg, &q->td->service_queue);
throttled = true;
if (update_disptime) {
- tg_update_disptime(&td->service_queue, tg);
+ tg_update_disptime(tg, &td->service_queue);
throtl_schedule_next_dispatch(td);
}
@@ -1132,7 +1134,7 @@ void blk_throtl_drain(struct request_queue *q)
__releases(q->queue_lock) __acquires(q->queue_lock)
{
struct throtl_data *td = q->td;
- struct throtl_service_queue *sq = &td->service_queue;
+ struct throtl_service_queue *parent_sq = &td->service_queue;
struct throtl_grp *tg;
struct bio_list bl;
struct bio *bio;
@@ -1141,8 +1143,8 @@ void blk_throtl_drain(struct request_queue *q)
bio_list_init(&bl);
- while ((tg = throtl_rb_first(sq))) {
- throtl_dequeue_tg(sq, tg);
+ while ((tg = throtl_rb_first(parent_sq))) {
+ throtl_dequeue_tg(tg, parent_sq);
while ((bio = bio_list_peek(&tg->bio_lists[READ])))
tg_dispatch_one_bio(tg, bio_data_dir(bio), &bl);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 20:28:24 +0100