You can serialize symbols that are necessary to analyze your application. Symbol serialization adds symbols to the .vsp file. By adding symbol information to the .vsp file, others can analyze performance report without having access to the original symbols. If symbols are not serialized, you will need original instrumented .exe and .pdb files to analyze the .vsp file.
To automatically serialize symbol information
On the Tools menu, click Options.
The Options dialog box is displayed
Click Performance Tools.
Under General Setting, select Automatically serialize symbol information.