linux-kernel - [PATCH v3 2/2] btrfs: use iget5_locked

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Message-ID: <20240611101633.507101-3-mjguzik@gmail.com>
Date: Tue, 11 Jun 2024 12:16:32 +0200
From: Mateusz Guzik <mjguzik@...il.com>
To: brauner@...nel.org
Cc: viro@...iv.linux.org.uk,
	jack@...e.cz,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-btrfs@...r.kernel.org,
	josef@...icpanda.com,
	hch@...radead.org,
	Mateusz Guzik <mjguzik@...il.com>
Subject: [PATCH v3 2/2] btrfs: use iget5_locked_rcu

With 20 threads each walking a dedicated 1000 dirs * 1000 files
directory tree to stat(2) on a 32 core + 24GB ram vm:

before: 3.54s user 892.30s system 1966% cpu 45.549 total
after:  3.28s user 738.66s system 1955% cpu 37.932 total (-16.7%)

Benchmark can be found here: https://people.freebsd.org/~mjg/fstree.tgz

Signed-off-by: Mateusz Guzik <mjguzik@...il.com>
---
 fs/btrfs/inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 4883cb512379..457d2c18d071 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5588,7 +5588,7 @@ static struct inode *btrfs_iget_locked(struct super_block *s, u64 ino,
 	args.ino = ino;
 	args.root = root;
 
-	inode = iget5_locked(s, hashval, btrfs_find_actor,
+	inode = iget5_locked_rcu(s, hashval, btrfs_find_actor,
 			     btrfs_init_locked_inode,
 			     (void *)&args);
 	return inode;
-- 
2.43.0