f2fs: add a tracepoint for f2fs_read_data_pages

This patch adds a tracepoint for f2fs_read_data_pages to trace when pages
are readahead by VFS.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 7de751d5763b..00b4a6308249 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -1028,6 +1028,32 @@ TRACE_EVENT(f2fs_writepages,
                 __entry->for_sync)
 );
 
+TRACE_EVENT(f2fs_readpages,
+
+        TP_PROTO(struct inode *inode, struct page *page, unsigned int nrpage),
+
+        TP_ARGS(inode, page, nrpage),
+
+        TP_STRUCT__entry(
+                __field(dev_t,  dev)
+                __field(ino_t,  ino)
+                __field(pgoff_t,        start)
+                __field(unsigned int,   nrpage)
+        ),
+
+        TP_fast_assign(
+                __entry->dev    = inode->i_sb->s_dev;
+                __entry->ino    = inode->i_ino;
+                __entry->start  = page->index;
+                __entry->nrpage = nrpage;
+        ),
+
+        TP_printk("dev = (%d,%d), ino = %lu, start = %lu nrpage = %u",
+                show_dev_ino(__entry),
+                (unsigned long)__entry->start,
+                __entry->nrpage)
+);
+
 TRACE_EVENT(f2fs_write_checkpoint,
 
         TP_PROTO(struct super_block *sb, int reason, char *msg),