On Fri, Jul 31, 2009 at 11:33:28PM +0200, Petter Reinholdtsen wrote: > [Josh Triplett] > > Please consider automatically mounting debugfs on /sys/kernel/debug > > when available. > > Why should this be done in the init.d scripts installed on each Debian > system, and not in some special package handling debugfs? What is > debugfs and who is using it?
debugfs provides an interface to in-kernel tracing and debugging facilities. The Debian kernels have debugfs available. Various subsystems have debugfs interfaces, including ftrace, usbmon, dri, kvm, and wireless. I'd suggest mounting debugfs by default because doing so will allow tracing tools like sysprof (packaged in Debian) and trace-cmd to work without additional configuration. Mounting debugfs does not entail any overhead apart from the time for one call to mount. mountkernfs already mounts other kernel filesystems, so it seemed like the right place to mount debugfs. Obviously a debugfs-common package could do the same thing, and packages which want to have debugfs enabled by default could depend on that; on the other hand, it seems somewhat silly to have a package for a five-line init script. Note that /etc/fstab seems like the *wrong* place to mount debugfs, because that would generate an error if booting a kernel without debugfs, and because that would require additional configuration before packages using debugfs would work. - Josh Triplett _______________________________________________ Pkg-sysvinit-devel mailing list [email protected] http://lists.alioth.debian.org/mailman/listinfo/pkg-sysvinit-devel
