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authorJosef Bacik <josef@toxicpanda.com>2018-12-04 18:59:03 +0100
committerJens Axboe <axboe@kernel.dk>2018-12-08 06:26:38 +0100
commitb6c7b58f5fcc2386bddf9852011c42c1d2b83979 (patch)
tree15d379a0c0a184d4d3d0f5c57478072f6dc34d62 /block/blk-wbt.c
parentblock: add rq_qos_wait to rq_qos (diff)
downloadlinux-b6c7b58f5fcc2386bddf9852011c42c1d2b83979.tar.xz
linux-b6c7b58f5fcc2386bddf9852011c42c1d2b83979.zip
block: convert wbt_wait() to use rq_qos_wait()
Now that we have rq_qos_wait() in place, convert wbt_wait() over to using it with it's specific callbacks. Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-wbt.c')
-rw-r--r--block/blk-wbt.c65
1 files changed, 11 insertions, 54 deletions
diff --git a/block/blk-wbt.c b/block/blk-wbt.c
index d051ebfb4852..40207edd1d89 100644
--- a/block/blk-wbt.c
+++ b/block/blk-wbt.c
@@ -489,31 +489,21 @@ static inline unsigned int get_limit(struct rq_wb *rwb, unsigned long rw)
}
struct wbt_wait_data {
- struct wait_queue_entry wq;
- struct task_struct *task;
struct rq_wb *rwb;
- struct rq_wait *rqw;
+ enum wbt_flags wb_acct;
unsigned long rw;
- bool got_token;
};
-static int wbt_wake_function(struct wait_queue_entry *curr, unsigned int mode,
- int wake_flags, void *key)
+static bool wbt_inflight_cb(struct rq_wait *rqw, void *private_data)
{
- struct wbt_wait_data *data = container_of(curr, struct wbt_wait_data,
- wq);
-
- /*
- * If we fail to get a budget, return -1 to interrupt the wake up
- * loop in __wake_up_common.
- */
- if (!rq_wait_inc_below(data->rqw, get_limit(data->rwb, data->rw)))
- return -1;
+ struct wbt_wait_data *data = private_data;
+ return rq_wait_inc_below(rqw, get_limit(data->rwb, data->rw));
+}
- data->got_token = true;
- list_del_init(&curr->entry);
- wake_up_process(data->task);
- return 1;
+static void wbt_cleanup_cb(struct rq_wait *rqw, void *private_data)
+{
+ struct wbt_wait_data *data = private_data;
+ wbt_rqw_done(data->rwb, rqw, data->wb_acct);
}
/*
@@ -525,45 +515,12 @@ static void __wbt_wait(struct rq_wb *rwb, enum wbt_flags wb_acct,
{
struct rq_wait *rqw = get_rq_wait(rwb, wb_acct);
struct wbt_wait_data data = {
- .wq = {
- .func = wbt_wake_function,
- .entry = LIST_HEAD_INIT(data.wq.entry),
- },
- .task = current,
.rwb = rwb,
- .rqw = rqw,
+ .wb_acct = wb_acct,
.rw = rw,
};
- bool has_sleeper;
-
- has_sleeper = wq_has_sleeper(&rqw->wait);
- if (!has_sleeper && rq_wait_inc_below(rqw, get_limit(rwb, rw)))
- return;
-
- prepare_to_wait_exclusive(&rqw->wait, &data.wq, TASK_UNINTERRUPTIBLE);
- do {
- if (data.got_token)
- break;
-
- if (!has_sleeper &&
- rq_wait_inc_below(rqw, get_limit(rwb, rw))) {
- finish_wait(&rqw->wait, &data.wq);
-
- /*
- * We raced with wbt_wake_function() getting a token,
- * which means we now have two. Put our local token
- * and wake anyone else potentially waiting for one.
- */
- if (data.got_token)
- wbt_rqw_done(rwb, rqw, wb_acct);
- break;
- }
-
- io_schedule();
- has_sleeper = false;
- } while (1);
- finish_wait(&rqw->wait, &data.wq);
+ rq_qos_wait(rqw, &data, wbt_inflight_cb, wbt_cleanup_cb);
}
static inline bool wbt_should_throttle(struct rq_wb *rwb, struct bio *bio)