On Thu, 2005-07-07 at 13:52 -0700, Greg KH wrote: > On Thu, Jul 07, 2005 at 03:55:45PM +0200, Martin Schlemmer wrote: > > 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. > > What rcscript support? >
Err, sorry, all the crap in /sbin/rc ... > > > Next up, that loony block device naming scheme (more on that later...) > > > > > > > > [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 ... > > The HAL patch? It's now in HAL's cvs tree, don't know when they will do > a new release. > Well, you did provide the patch, so hopefully foser or somebody else will just add it. Foser ping ... > > 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" > > Yes. > > Want me to just change the default rule to yours? > I do not think that will work, as that is not distributed with either udev or device-mapper, but multipath-tools (sorda silly if you ask me, as I think it would have been more appropriate with device-mapper, but what the hey). Anyhow, I'll see if I can hack a patch or something up so that NAME="" will also be seen as as a rule that 'set the name' .... Thanks, -- Martin Schlemmer Gentoo Linux Developer, Desktop/System Team Developer Cape Town, South Africa
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