If budget left is less than budget need by next request, the activated bfqq
will be expired if it preempts the in-service queue. Avoid to cause useless
overhead to check budget left is enough for next request.
Signed-off-by: Kemeng Shi <[email protected]>
---
block/bfq-iosched.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index be69b0e061f7..f4b4ba05f804 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -1623,7 +1623,7 @@ static bool bfq_bfqq_update_budg_for_activation(struct bfq_data *bfqd,
* service. This would only cause useless overhead.
*/
if (bfq_bfqq_non_blocking_wait_rq(bfqq) && arrived_in_time &&
- bfq_bfqq_budget_left(bfqq) > 0) {
+ bfq_bfqq_budget_left(bfqq) >= bfq_serv_to_charge(bfqq->next_rq, bfqq)) {
/*
* We do not clear the flag non_blocking_wait_rq here, as
* the latter is used in bfq_activate_bfqq to signal
--
2.30.0