linux-kernel - [PATCH -next v5 6/8] blk-throttle: calling throtl_dequeue/enqueue

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Message-ID: <20220528064330.3471000-7-yukuai3@huawei.com>
Date:   Sat, 28 May 2022 14:43:28 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <tj@...nel.org>, <mkoutny@...e.com>, <axboe@...nel.dk>,
        <ming.lei@...hat.com>
CC:     <cgroups@...r.kernel.org>, <linux-block@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <yukuai3@...wei.com>,
        <yi.zhang@...wei.com>
Subject: [PATCH -next v5 6/8] blk-throttle: calling throtl_dequeue/enqueue_tg in pairs

It's a litter weird to call throtl_dequeue_tg() unconditionally in
throtl_select_dispatch(), since it will be called in
tg_update_disptime() again if some bio is still throttled.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 block/blk-throttle.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 454a360f42e8..e6ae86d284b9 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1145,13 +1145,13 @@ static int throtl_select_dispatch(struct throtl_service_queue *parent_sq)
 		if (time_before(jiffies, tg->disptime))
 			break;
 
-		throtl_dequeue_tg(tg);
-
 		nr_disp += throtl_dispatch_tg(tg);
 
 		sq = &tg->service_queue;
 		if (sq->nr_queued[READ] || sq->nr_queued[WRITE])
 			tg_update_disptime(tg);
+		else
+			throtl_dequeue_tg(tg);
 
 		if (nr_disp >= THROTL_QUANTUM)
 			break;
-- 
2.31.1