linux-kernel - [PATCH] aio: inform block layer of how many requests we are submitting

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Message-Id: <1642497464-1847-1-git-send-email-zhenggy@chinatelecom.cn>
Date:   Tue, 18 Jan 2022 17:17:44 +0800
From:   GuoYong Zheng <zhenggy@...natelecom.cn>
To:     bcrl@...ck.org, viro@...iv.linux.org.uk
Cc:     linux-aio@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        GuoYong Zheng <zhenggy@...natelecom.cn>
Subject: [PATCH] aio: inform block layer of how many requests we are submitting

After commit 47c122e35d7e ("block: pre-allocate requests if plug is
started and is a batch"), block layer can make smarter request allocation
if it know how many requests it need to submit, so switch to use
blk_start_plug_nr_ios here to pass the number of requests we will submit.

Signed-off-by: GuoYong Zheng <zhenggy@...natelecom.cn>
---
 fs/aio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/aio.c b/fs/aio.c
index 4ceba13..7c4935e 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -2071,7 +2071,7 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
 		nr = ctx->nr_events;
 
 	if (nr > AIO_PLUG_THRESHOLD)
-		blk_start_plug(&plug);
+		blk_start_plug_nr_ios(&plug, nr);
 	for (i = 0; i < nr; i++) {
 		struct iocb __user *user_iocb;
 
-- 
1.8.3.1