linux-kernel - Re: [PATCH v2] f2fs: add fadvise tracepoint

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Message-ID: <aQUrtSAXWtHtLhtm@google.com>
Date: Fri, 31 Oct 2025 21:35:49 +0000
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: linux-kernel@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH v2] f2fs: add fadvise tracepoint

This adds a tracepoint in the fadvise call path.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---

 v2 from v1:
  - use i_size_read()

 fs/f2fs/file.c              |  2 ++
 include/trace/events/f2fs.h | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 7b966f6d40d2..d7047ca6b98d 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -5288,6 +5288,8 @@ static int f2fs_file_fadvise(struct file *filp, loff_t offset, loff_t len,
 	struct inode *inode = file_inode(filp);
 	int err;
 
+	trace_f2fs_fadvise(inode, offset, len, advice);
+
 	if (advice == POSIX_FADV_SEQUENTIAL) {
 		if (S_ISFIFO(inode->i_mode))
 			return -ESPIPE;
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index e1fae78d64a5..e00611ead024 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -586,6 +586,38 @@ TRACE_EVENT(f2fs_file_write_iter,
 		__entry->ret)
 );
 
+TRACE_EVENT(f2fs_fadvise,
+
+	TP_PROTO(struct inode *inode, loff_t offset, loff_t len, int advice),
+
+	TP_ARGS(inode, offset, len, advice),
+
+	TP_STRUCT__entry(
+		__field(dev_t,	dev)
+		__field(ino_t,	ino)
+		__field(loff_t, size)
+		__field(loff_t,	offset)
+		__field(loff_t,	len)
+		__field(int,	advice)
+	),
+
+	TP_fast_assign(
+		__entry->dev	= inode->i_sb->s_dev;
+		__entry->ino	= inode->i_ino;
+		__entry->size	= i_size_read(inode);
+		__entry->offset	= offset;
+		__entry->len	= len;
+		__entry->advice	= advice;
+	),
+
+	TP_printk("dev = (%d,%d), ino = %lu, i_size = %lld offset:%llu, len:%llu, advise:%d",
+		show_dev_ino(__entry),
+		(unsigned long long)__entry->size,
+		__entry->offset,
+		__entry->len,
+		__entry->advice)
+);
+
 TRACE_EVENT(f2fs_map_blocks,
 	TP_PROTO(struct inode *inode, struct f2fs_map_blocks *map, int flag,
 		 int ret),
-- 
2.51.2.997.g839fc31de9-goog