linux-kernel - [PATCH v2 2/4] fs: use fput_close

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Message-ID: <20250304183506.498724-3-mjguzik@gmail.com>
Date: Tue,  4 Mar 2025 19:35:04 +0100
From: Mateusz Guzik <mjguzik@...il.com>
To: brauner@...nel.org,
	viro@...iv.linux.org.uk
Cc: jack@...e.cz,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Mateusz Guzik <mjguzik@...il.com>
Subject: [PATCH v2 2/4] fs: use fput_close_sync() in close()

This bumps open+close rate by 1% on Sapphire Rapids by eliding one
atomic.

It would be higher if it was not for several other slowdowns of the same
nature.

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

diff --git a/fs/open.c b/fs/open.c
index 57e088c01ea4..fc1c6118eb30 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -1615,7 +1615,7 @@ SYSCALL_DEFINE1(close, unsigned int, fd)
 	 * We're returning to user space. Don't bother
 	 * with any delayed fput() cases.
 	 */
-	__fput_sync(file);
+	fput_close_sync(file);
 
 	if (likely(retval == 0))
 		return 0;
-- 
2.43.0