linux-kernel - [PATCH 04/20] block, bfq: simpfy computation of bfqd->budgets

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Date:   Tue, 1 Nov 2022 17:34:01 +0800
From:   Kemeng Shi <shikemeng@...wei.com>
To:     <paolo.valente@...aro.org>, <axboe@...nel.dk>
CC:     <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <shikemeng@...wei.com>
Subject: [PATCH 04/20] block, bfq: simpfy computation of bfqd->budgets_assigned

The computation of budgets_assigned is a little confusing as we only need
to check if it's updated more than 10 times. Simpfy the computation to
improve readability.

Signed-off-by: Kemeng Shi <shikemeng@...wei.com>
---
 block/bfq-iosched.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index b21c3711d69d..be69b0e061f7 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -175,7 +175,7 @@ static const int bfq_back_penalty = 2;
 static u64 bfq_slice_idle = NSEC_PER_SEC / 125;
 
 /* Minimum number of assigned budgets for which stats are safe to compute. */
-static const int bfq_stats_min_budgets = 194;
+static const int bfq_stats_min_budgets = 11;
 
 /* Default maximum budget values, in sectors and number of requests. */
 static const int bfq_default_max_budget = 16 * 1024;
@@ -3288,7 +3288,7 @@ static void __bfq_set_in_service_queue(struct bfq_data *bfqd,
 	if (bfqq) {
 		bfq_clear_bfqq_fifo_expire(bfqq);
 
-		bfqd->budgets_assigned = (bfqd->budgets_assigned * 7 + 256) / 8;
+		bfqd->budgets_assigned++;
 
 		if (time_is_before_jiffies(bfqq->last_wr_start_finish) &&
 		    bfqq->wr_coeff > 1 &&
-- 
2.30.0