linux-kernel - [PATCH -next 2/2] block: add plug while submitting IO

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Message-Id: <20240411032349.3051233-3-yukuai1@huaweicloud.com>
Date: Thu, 11 Apr 2024 11:23:49 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: axboe@...nel.dk,
	johannes.thumshirn@....com
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	yukuai3@...wei.com,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH -next 2/2] block: add plug while submitting IO

From: Yu Kuai <yukuai3@...wei.com>

So that if caller didn't use plug, for example, __blkdev_direct_IO_simple()
and __blkdev_direct_IO_async(), block layer can still benefit from caching
nsec time in the plug. And if caller already use plug, then there should be
no affect.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 block/blk-core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/block/blk-core.c b/block/blk-core.c
index e317d7bc0696..c833bc875a61 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -647,11 +647,13 @@ static void __submit_bio(struct bio *bio)
 static void __submit_bio_noacct(struct bio *bio)
 {
 	struct bio_list bio_list_on_stack[2];
+	struct blk_plug plug;
 
 	BUG_ON(bio->bi_next);
 
 	bio_list_init(&bio_list_on_stack[0]);
 	current->bio_list = bio_list_on_stack;
+	blk_start_plug(&plug);
 
 	do {
 		struct request_queue *q = bdev_get_queue(bio->bi_bdev);
@@ -685,19 +687,23 @@ static void __submit_bio_noacct(struct bio *bio)
 		bio_list_merge(&bio_list_on_stack[0], &bio_list_on_stack[1]);
 	} while ((bio = bio_list_pop(&bio_list_on_stack[0])));
 
+	blk_finish_plug(&plug);
 	current->bio_list = NULL;
 }
 
 static void __submit_bio_noacct_mq(struct bio *bio)
 {
 	struct bio_list bio_list[2] = { };
+	struct blk_plug plug;
 
 	current->bio_list = bio_list;
+	blk_start_plug(&plug);
 
 	do {
 		__submit_bio(bio);
 	} while ((bio = bio_list_pop(&bio_list[0])));
 
+	blk_finish_plug(&plug);
 	current->bio_list = NULL;
 }
 
-- 
2.39.2