blk-throttle: remove last_low_overflow_time

last_low_overflow_time is not used anymore after commit bf20ab538c81
("blk-throttle: remove CONFIG_BLK_DEV_THROTTLING_LOW").

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20240903135149.271857-2-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index dc6140f..eb859c4 100644 (file)
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1611,17 +1611,13 @@ bool __blk_throtl_bio(struct bio *bio)
        sq = &tg->service_queue;
 
        while (true) {
-               if (tg->last_low_overflow_time[rw] == 0)
-                       tg->last_low_overflow_time[rw] = jiffies;
                /* throtl is FIFO - if bios are already queued, should queue */
                if (sq->nr_queued[rw])
                        break;
 
                /* if above limits, break to queue */
-               if (!tg_may_dispatch(tg, bio, NULL)) {
-                       tg->last_low_overflow_time[rw] = jiffies;
+               if (!tg_may_dispatch(tg, bio, NULL))
                        break;
-               }
 
                /* within limits, let's charge and dispatch directly */
                throtl_charge_bio(tg, bio);
@@ -1661,8 +1657,6 @@ bool __blk_throtl_bio(struct bio *bio)
                   tg->io_disp[rw], tg_iops_limit(tg, rw),
                   sq->nr_queued[READ], sq->nr_queued[WRITE]);
 
-       tg->last_low_overflow_time[rw] = jiffies;
-
        td->nr_queued[rw]++;
        throtl_add_bio_tg(bio, qn, tg);
        throttled = true;

diff --git a/block/blk-throttle.h b/block/blk-throttle.h
index 4d9ef5a..1a36d12 100644 (file)
--- a/block/blk-throttle.h
+++ b/block/blk-throttle.h
@@ -106,8 +106,6 @@ struct throtl_grp {
        /* Number of bio's dispatched in current slice */
        unsigned int io_disp[2];
 
-       unsigned long last_low_overflow_time[2];
-
        uint64_t last_bytes_disp[2];
        unsigned int last_io_disp[2];