linux-kernel - [PATCH] blk-throttle: Eliminate redundant checks for data direction

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Date: Tue, 23 Jan 2024 16:12:48 +0800
From: Tang Yizhou <yizhou.tang@...pee.com>
To: tj@...nel.org,
	axboe@...nel.dk
Cc: linux-block@...r.kernel.org,
	cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	chunguang.xu@...pee.com,
	Tang Yizhou <yizhou.tang@...pee.com>
Subject: [PATCH] blk-throttle: Eliminate redundant checks for data direction

From: Tang Yizhou <yizhou.tang@...pee.com>

After calling throtl_peek_queued(), the data direction can be determined so
there is no need to call bio_data_dir() to check the direction again.

Signed-off-by: Tang Yizhou <yizhou.tang@...pee.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 16f5766620a4..2ad4f6cd465b 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1098,7 +1098,7 @@ static int throtl_dispatch_tg(struct throtl_grp *tg)
 	while ((bio = throtl_peek_queued(&sq->queued[READ])) &&
 	       tg_may_dispatch(tg, bio, NULL)) {
 
-		tg_dispatch_one_bio(tg, bio_data_dir(bio));
+		tg_dispatch_one_bio(tg, READ);
 		nr_reads++;
 
 		if (nr_reads >= max_nr_reads)
@@ -1108,7 +1108,7 @@ static int throtl_dispatch_tg(struct throtl_grp *tg)
 	while ((bio = throtl_peek_queued(&sq->queued[WRITE])) &&
 	       tg_may_dispatch(tg, bio, NULL)) {
 
-		tg_dispatch_one_bio(tg, bio_data_dir(bio));
+		tg_dispatch_one_bio(tg, WRITE);
 		nr_writes++;
 
 		if (nr_writes >= max_nr_writes)
-- 
2.25.1