linux-kernel - [PATCH BUGFIX/IMPROVEMENT 4/4] block, bfq: improve code of bfq_bfqq_charge

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Message-Id: <20180816165118.17402-5-paolo.valente@linaro.org>
Date:   Thu, 16 Aug 2018 18:51:18 +0200
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        ulf.hansson@...aro.org, linus.walleij@...aro.org,
        broonie@...nel.org, bfq-iosched@...glegroups.com,
        oleksandr@...alenko.name, Paolo Valente <paolo.valente@...aro.org>
Subject: [PATCH BUGFIX/IMPROVEMENT 4/4] block, bfq: improve code of bfq_bfqq_charge_time

bfq_bfqq_charge_time contains some lengthy and redundant code. This
commit trims and condenses that code.

Signed-off-by: Paolo Valente <paolo.valente@...aro.org>
---
 block/bfq-wf2q.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/block/bfq-wf2q.c b/block/bfq-wf2q.c
index d558fd26740c..ae52bff43ce4 100644
--- a/block/bfq-wf2q.c
+++ b/block/bfq-wf2q.c
@@ -881,15 +881,11 @@ void bfq_bfqq_charge_time(struct bfq_data *bfqd, struct bfq_queue *bfqq,
 			  unsigned long time_ms)
 {
 	struct bfq_entity *entity = &bfqq->entity;
-	int tot_serv_to_charge = entity->service;
-	unsigned int timeout_ms = jiffies_to_msecs(bfq_timeout);
-
-	if (time_ms > 0 && time_ms < timeout_ms)
-		tot_serv_to_charge =
-			(bfqd->bfq_max_budget * time_ms) / timeout_ms;
-
-	if (tot_serv_to_charge < entity->service)
-		tot_serv_to_charge = entity->service;
+	unsigned long timeout_ms = jiffies_to_msecs(bfq_timeout);
+	unsigned long bounded_time_ms = min(time_ms, timeout_ms);
+	int serv_to_charge_for_time =
+		(bfqd->bfq_max_budget * bounded_time_ms) / timeout_ms;
+	int tot_serv_to_charge = max(serv_to_charge_for_time, entity->service);
 
 	/* Increase budget to avoid inconsistencies */
 	if (tot_serv_to_charge > entity->budget)
-- 
2.16.1