f2fs: add tracepoint for f2fs_filemap_fault()

This patch adds tracepoint for f2fs_filemap_fault().
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

@@ -39,6 +39,8 @@ static vm_fault_t f2fs_filemap_fault(struct vm_fault *vmf)
 	ret = filemap_fault(vmf);
 	up_read(&F2FS_I(inode)->i_mmap_sem);
 
+	trace_f2fs_filemap_fault(inode, vmf->pgoff, (unsigned long)ret);
+
 	return ret;
 }
 

include/trace/events/f2fs.h

@@ -1284,6 +1284,32 @@ DEFINE_EVENT(f2fs__page, f2fs_commit_inmem_page,
 	TP_ARGS(page, type)
 );
 
+TRACE_EVENT(f2fs_filemap_fault,
+
+	TP_PROTO(struct inode *inode, pgoff_t index, unsigned long ret),
+
+	TP_ARGS(inode, index, ret),
+
+	TP_STRUCT__entry(
+		__field(dev_t,	dev)
+		__field(ino_t,	ino)
+		__field(pgoff_t, index)
+		__field(unsigned long, ret)
+	),
+
+	TP_fast_assign(
+		__entry->dev	= inode->i_sb->s_dev;
+		__entry->ino	= inode->i_ino;
+		__entry->index	= index;
+		__entry->ret	= ret;
+	),
+
+	TP_printk("dev = (%d,%d), ino = %lu, index = %lu, ret = %lx",
+		show_dev_ino(__entry),
+		(unsigned long)__entry->index,
+		__entry->ret)
+);
+
 TRACE_EVENT(f2fs_writepages,
 
 	TP_PROTO(struct inode *inode, struct writeback_control *wbc, int type),