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blk-throttle: Avoid getting the current time if tg->last_finish_time is 0

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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>
This commit is contained in:
Baolin Wang 2020-10-08 11:52:23 +08:00 committed by Jens Axboe
parent 4247d9c8ba
commit 7901601aef
1 changed files with 6 additions and 2 deletions
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8
block/blk-throttle.c
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@ -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;