[f2fs-dev] [PATCH 2/2] f2fs: add a tracepoint for readahead pages

[Jaegeuk Kim via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>]

This patch adds a tracepoint to track the f2fs_readahead_pages().

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/data.c              |  3 +++
 include/trace/events/f2fs.h | 43 +++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index d95974d79fb3..c80d7960b652 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2757,6 +2757,8 @@ int f2fs_readahead_pages(struct file *file, loff_t offset, loff_t len)
 	if (start_index > end_index)
 		return 0;
 
+	trace_f2fs_readahead_pages_start(inode, start_index, end_index);
+
 	nrpages = end_index - start_index + 1;
 
 	while (nrpages) {
@@ -2768,6 +2770,7 @@ int f2fs_readahead_pages(struct file *file, loff_t offset, loff_t len)
 
 		nrpages -= this_chunk;
 	}
+	trace_f2fs_readahead_pages_end(inode, start_index, end_index);
 	return 0;
 }
 
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index d406b047c50b..bb98a9655ec9 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -618,6 +618,49 @@ TRACE_EVENT(f2fs_fadvise,
 		__entry->advice)
 );
 
+DECLARE_EVENT_CLASS(f2fs__readahead_pages,
+
+	TP_PROTO(struct inode *inode, pgoff_t start, pgoff_t end),
+
+	TP_ARGS(inode, start, end),
+
+	TP_STRUCT__entry(
+		__field(dev_t,	dev)
+		__field(ino_t,	ino)
+		__field(loff_t, size)
+		__field(pgoff_t, start)
+		__field(pgoff_t, end)
+	),
+
+	TP_fast_assign(
+		__entry->dev	= inode->i_sb->s_dev;
+		__entry->ino	= inode->i_ino;
+		__entry->size	= inode->i_size;
+		__entry->start = start;
+		__entry->end	= end;
+	),
+
+	TP_printk("dev = (%d,%d), ino = %lu, i_size = %lld start: %lu, end: %lu",
+		show_dev_ino(__entry),
+		(unsigned long long)__entry->size,
+		__entry->start,
+		__entry->end)
+);
+
+DEFINE_EVENT(f2fs__readahead_pages, f2fs_readahead_pages_start,
+
+	TP_PROTO(struct inode *inode, pgoff_t start, pgoff_t end),
+
+	TP_ARGS(inode, start, end)
+);
+
+DEFINE_EVENT(f2fs__readahead_pages, f2fs_readahead_pages_end,
+
+	TP_PROTO(struct inode *inode, pgoff_t start, pgoff_t end),
+
+	TP_ARGS(inode, start, end)
+);
+
 TRACE_EVENT(f2fs_map_blocks,
 	TP_PROTO(struct inode *inode, struct f2fs_map_blocks *map, int flag,
 		 int ret),
-- 
2.52.0.487.g5c8c507ade-goog



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