diff options
| author | Baolin Wang <baolin.wang@linux.alibaba.com> | 2020-10-08 06:52:23 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-10-08 17:01:37 +0300 |
| commit | 7901601aef35082d8431d05ab50a3567f7624b55 (patch) | |
| tree | abac41987e02d3e86593714e33a22e2e8b640a6e /block | |
| parent | 4247d9c8ba810c1d4a9502893a9ce1cec6abbf7a (diff) | |
| download | linux-7901601aef35082d8431d05ab50a3567f7624b55.tar.xz | |
blk-throttle: Avoid getting the current time if tg->last_finish_time is 0
We only update the tg->last_finish_time when the low limitaion is
enabled, so we can move the tg->last_finish_time validation a little
forward to avoid getting the unnecessary current time stamp if the
the low limitation is not enabled.
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-throttle.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 4007b26d4fd7..7e72102aa918 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -2077,10 +2077,14 @@ static void throtl_downgrade_check(struct throtl_grp *tg) static void blk_throtl_update_idletime(struct throtl_grp *tg) { - unsigned long now = ktime_get_ns() >> 10; + unsigned long now; unsigned long last_finish_time = tg->last_finish_time; - if (now <= last_finish_time || last_finish_time == 0 || + if (last_finish_time == 0) + return; + + now = ktime_get_ns() >> 10; + if (now <= last_finish_time || last_finish_time == tg->checked_last_finish_time) return; |