linux-kernel - [PATCH] 9p: set readahead and io size according to maxsize

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Message-Id: <20211104120323.2189376-1-asmadeus@codewreck.org>
Date:   Thu,  4 Nov 2021 21:03:23 +0900
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     v9fs-developer@...ts.sourceforge.net
Cc:     linux-kernel@...r.kernel.org, Latchesar Ionkov <lucho@...kov.net>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Dominique Martinet <asmadeus@...ewreck.org>
Subject: [PATCH] 9p: set readahead and io size according to maxsize

having a readahead of 128k with a msize of 128k (with overhead) lead to
reading 124+4k everytime, making two roundtrips needlessly.

tune readahead according to msize when cache is enabled for better
performance

Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>
---
 fs/9p/vfs_super.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index c6028af51925..b0632f4e337f 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -79,6 +79,9 @@ v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
 	if (!v9ses->cache) {
 		sb->s_bdi->ra_pages = 0;
 		sb->s_bdi->io_pages = 0;
+	} else {
+		sb->s_bdi->ra_pages = v9ses->maxdata >> PAGE_SHIFT;
+		sb->s_bdi->io_pages = v9ses->maxdata >> PAGE_SHIFT;
 	}
 
 	sb->s_flags |= SB_ACTIVE | SB_DIRSYNC;
-- 
2.31.1