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blk-iocost: make iocg_kick_waitq() call iocg_kick_delay() after paying debt 

iocg_kick_waitq() is the function which pays debt and iocg_kick_delay()
updates the actual delay status accordingly. If iocg_kick_delay() is not
called after iocg_kick_delay() updated debt, unnecessarily large delays can
be applied temporarily.

Let's make sure such conditions don't occur by making iocg_kick_waitq()
always call iocg_kick_delay() after paying debt.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2020-09-01 14:52:37 -04:00 committed by Jens Axboe
parent 6ef20f787b
commit 7b84b49e38
1 changed files with 2 additions and 1 deletions
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3
block/blk-iocost.c
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@ -1226,6 +1226,8 @@ static void iocg_kick_waitq(struct ioc_gq *iocg, struct ioc_now *now)
atomic64_add(delta, &iocg->vtime);
atomic64_add(delta, &iocg->done_vtime);
iocg->abs_vdebt -= abs_delta;
iocg_kick_delay(iocg, now);
}
/*
@ -1383,7 +1385,6 @@ static void ioc_timer_fn(struct timer_list *timer)
if (waitqueue_active(&iocg->waitq) || iocg->abs_vdebt) {
/* might be oversleeping vtime / hweight changes, kick */
iocg_kick_waitq(iocg, &now);
iocg_kick_delay(iocg, &now);
} else if (iocg_is_idle(iocg)) {
/* no waiter and idle, deactivate */
iocg->last_inuse = iocg->inuse;