Messages in this thread | | | Date | Sun, 3 Jul 2005 01:03:03 +0200 | From | Willy Tarreau <> | Subject | Re: updating kernel to 2.6.13-rc1 from 2.6.12 + CONFIG_DEVFS_FS + empty /dev |
| |
On Sat, Jul 02, 2005 at 01:13:58PM -0700, Mike Bell wrote: > On Sat, Jul 02, 2005 at 12:03:49PM +0200, Willy Tarreau wrote: > > They cost almost nothing, and in all cases, far less than the required code > > to autodetect them. > > I beg to differ on that. As ndevfs has shown, the code required to > create a device node from kernel space is actually very minimal, when > you utilize all the infrastructure already available to you in the > kernel. libfs has most of what you need, the rest is easily stolen from > ramfs. Almost undoubtebly much less than all those device nodes, > especially when you consider the need to be able to perform chown/chmod > on nodes (thus they can't be stored in the read-only flash image, but > must instead be created at each boot on a kernel-generated filesystem > like ramfs)
Well, here on my firewall, the /.preinit script is 1.7 kB and the init binary which does everything (mkdir,mknod,chmod,chown,mount,...) is 5.6 kB. I doubt you can enable devfs in a kernel for less than 8 kB. One /tmpfs entry consumes about 600 bytes of RAM, which is still fairly acceptable IMHO.
> devfs not utilizing it is perfectly explainable by the fact none of it > was around way back when devfs was created. Back then kernel generated > filesystems were proc, proc and proc. proc is pretty ugly too.
Regards, Willy
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |