f2fs: add a tracepoint for f2fs_read_data_page

This patch adds a tracepoint for f2fs_read_data_page to trace when page is
readed by user.

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

2 files changed, 15 insertions, 2 deletions

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 21bfafaafe83..8c250a5d6f26 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -713,6 +713,8 @@ static int f2fs_read_data_page(struct file *file, struct page *page)
         struct inode *inode = page->mapping->host;
         int ret;
 
+        trace_f2fs_readpage(page, DATA);
+
         /* If the file has inline data, try to read it directlly */
         if (f2fs_has_inline_data(inode))
                 ret = f2fs_read_inline_data(inode, page);
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 91b1fcc5ec93..b983990b4a9f 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -732,6 +732,7 @@ DECLARE_EVENT_CLASS(f2fs__page,
                 __field(int, dir)
                 __field(pgoff_t, index)
                 __field(int, dirty)
+                __field(int, uptodate)
         ),
 
         TP_fast_assign(
@@ -741,14 +742,17 @@ DECLARE_EVENT_CLASS(f2fs__page,
                 __entry->dir    = S_ISDIR(page->mapping->host->i_mode);
                 __entry->index  = page->index;
                 __entry->dirty  = PageDirty(page);
+                __entry->uptodate = PageUptodate(page);
         ),
 
-        TP_printk("dev = (%d,%d), ino = %lu, %s, %s, index = %lu, dirty = %d",
+        TP_printk("dev = (%d,%d), ino = %lu, %s, %s, index = %lu, "
+                "dirty = %d, uptodate = %d",
                 show_dev_ino(__entry),
                 show_block_type(__entry->type),
                 show_file_type(__entry->dir),
                 (unsigned long)__entry->index,
-                __entry->dirty)
+                __entry->dirty,
+                __entry->uptodate)
 );
 
 DEFINE_EVENT(f2fs__page, f2fs_writepage,
@@ -758,6 +762,13 @@ DEFINE_EVENT(f2fs__page, f2fs_writepage,
         TP_ARGS(page, type)
 );
 
+DEFINE_EVENT(f2fs__page, f2fs_readpage,
+
+        TP_PROTO(struct page *page, int type),
+
+        TP_ARGS(page, type)
+);
+
 DEFINE_EVENT(f2fs__page, f2fs_set_page_dirty,
 
         TP_PROTO(struct page *page, int type),