blk-throttle: Avoid checking bps/iops limitation if bps or iops is unlimited

Do not need check the bps or iops limitation if bps or iops is unlimited.

Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 8719e37..36ba61c 100644 (file)
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -901,6 +901,12 @@ static bool tg_with_in_iops_limit(struct throtl_grp *tg, struct bio *bio,
        unsigned long jiffy_elapsed, jiffy_wait, jiffy_elapsed_rnd;
        u64 tmp;
 
+       if (iops_limit == UINT_MAX) {
+               if (wait)
+                       *wait = 0;
+               return true;
+       }
+
        jiffy_elapsed = jiffies - tg->slice_start[rw];
 
        /* Round up to the next throttle slice, wait time must be nonzero */
@@ -943,6 +949,12 @@ static bool tg_with_in_bps_limit(struct throtl_grp *tg, struct bio *bio,
        unsigned long jiffy_elapsed, jiffy_wait, jiffy_elapsed_rnd;
        unsigned int bio_size = throtl_bio_data_size(bio);
 
+       if (bps_limit == U64_MAX) {
+               if (wait)
+                       *wait = 0;
+               return true;
+       }
+
        jiffy_elapsed = jiffy_elapsed_rnd = jiffies - tg->slice_start[rw];
 
        /* Slice has just started. Consider one slice interval */