GDM的PreFetchProgram选项怎么用？

MACHINE

据说GDM的PreFetchProgram选项可以预装载指定的Libraries，但怎么用呢？

BeCome

2.12. GDM Performance

To speed performance it is possible to build GDM so that it will preload libraries when GDM first displays a greeter program. This has been shown to speed first time login since these libraries can be loaded into memory while the user types in their username and password.

To use this feature, configure GDM with the --with-prefetch option. This will cause GDM to install the gdmprefetch program to the EXPANDED_LIBEXEC directory, install the gdmprefetchlist to the <etc>/gdm directory, and set the PreFetchProgram configuration variable so that the gdmprefetch program is called with the default gdmprefetchlist file. The default gdmprefetchlist file was optimized for a GNOME desktop running on Solaris, so may need fine-tuning on other systems. Alternative prefetchlist files can be contributed to the "gdm" category in bugzilla.gnome.org, so that they can be included in future GDM releases.