linux-kernel - [PATCH 11/17] block, bfq: simpfy computation of bfqd->budgets

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Date:   Sun, 19 Feb 2023 18:43:03 +0800
From:   Kemeng Shi <shikemeng@...weicloud.com>
To:     paolo.valente@...aro.org, axboe@...nel.dk, jack@...e.cz
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        shikemeng@...weicloud.com
Subject: [PATCH 11/17] 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@...weicloud.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 2559343593bb..a8cb0a0d36f3 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;
@@ -3317,7 +3317,7 @@ 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