On Wed, 2005-07-06 at 15:46 -0700, Greg KH wrote: > Ok, now that devfs is removed from the 2.6 kernel tree[1], I think it's > time to start to revisit some of the /dev naming rules that we currently > are living with[2]. > > To start with, the 061 version of udev offers a big memory savings if > you use the "default" kernel name of a device[3]. If you do that, it does > not create a file in its database in /dev/.udevdb/ > > If we can move away from some of our devfs-like names, we stand to > reclaim a lot of memory from everyone's machines. As an example, if we > drop all of the tty/pts/vc/vcc symlinks, and just go with the default > kernel name, we save 2.5Mb of space in tempfs/ramfs. I've done this on > my machines and everything seems to work just fine (it looks like > everything that was trying to use a tty node was just using the symlink > anyway.) > > So, anyone have any objections to me changing the default udev naming > scheme in this manner? >
Fine with me. I assume we will need to keep the rcscript support for those die-hard 2.4 users still, but hopefully we can eventually drop that as well. > Next up, that loony block device naming scheme (more on that later...) > Heh. I hope that we will still at least just do the cdsymlinks stuff (just the /dev/cdrom, /dev/dvd, etc stuff) as that do make things a bit easier for multimedia stuff. > [3] HAL needs a patch to be able to handle this. It's posted on the > hal development mailing lists and will be checked in real-soon-now. I just think we need to make sure this is in first ... Lastly on an unrelated note ... I have a rule: ----- # cat /etc/udev/rules.d/40-dm.rules KERNEL="dm-[0-9]*", PROGRAM="/sbin/devmap_name %M %m", NAME="mapper/%c", SYMLINK="%c" ----- And in theory it should be the last rule to set the name ... however the default one in 50-udev.rules overrides it, and I have to add OPTIONS="last_rule" --- (default rule) --- KERNEL="dm-[0-9]*", NAME="" ---------------------- I am assuming (without having looked at the code) that because NAME is set to "", whatever code that should drop it as it have NAME, does not kick in? Thanks, -- Martin Schlemmer Gentoo Linux Developer, Desktop/System Team Developer Cape Town, South Africa
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