From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg KH Date: Thu, 03 Aug 2006 08:39:06 +0000 Subject: Re: udev on Fedore 5 Message-Id: <20060803083906.GA29339@kroah.com> List-Id: References: <1154582086.8839.42.camel@piet2.bluelane.com> In-Reply-To: <1154582086.8839.42.camel@piet2.bluelane.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: linux-hotplug@vger.kernel.org On Wed, Aug 02, 2006 at 10:14:46PM -0700, Piet Delaney wrote: > I wasn't able to login to your Fedora 5 (10.10.111.220). > I tried my AMD hammer at home (hammer.piet.net) and looked > at the Fedora 5 udev scripts. I can't see what the gento=20 > /sbin/start_udev might be doing to boost Performance so much > and didn't see the udev daemon stuff we saw on your system. > Perhaps it's probing the modules to pre-awaken them. I'm not > using modules, so I doubt it would have an effect. The gentoo script for startup is attached below. It picks it's startup logic depending on the kernel version running. Hope this helps, greg k-h ------------------ # Copyright 1999-2005 Gentoo Foundation # Distributed under the terms of the GNU General Public License v2 udev_version() { local version=3D0 if [[ -x /sbin/udev ]] ; then version=3D$(/sbin/udev -V) # We need it without a leading '0', else bash do the wrong thing version=3D${version##0} # Older udev's will print nothing [[ -z ${version} ]] && version=3D0 fi echo "${version}" } # This works for 2.6.15 kernels or greater trigger_events() { list=3D"" # if you want real coldplug (with all modules being loaded for all # devices in the system), uncomment out the next line. #list=3D"$list $(echo /sys/bus/*/devices/*/uevent)" list=3D"$list $(echo /sys/class/*/*/uevent)" list=3D"$list $(echo /sys/block/*/uevent /sys/block/*/*/uevent)" for i in $list; do case "$i" in */device/uevent) # skip followed device symlinks continue ;; */class/mem/*|*/class/tty/*) first=3D"$first $i" ;; */block/md*) last=3D"$last $i" ;; */*) default=3D"$default $i" ;; esac done # trigger the sorted events for i in $first $default $last; do echo "add" > "$i" done } populate_udev() { # populate /dev with devices already found by the kernel if [ "$(get_KV)" -gt "$(KV_to_int '2.6.14')" ] ; then ebegin "Populating /dev with existing devices through uevents" udevtrigger eend 0 else ebegin "Populating /dev with existing devices with udevstart" /sbin/udevstart eend 0 fi # loop until everything is finished # there's gotta be a better way... ebegin "Letting udev process events" loop=3D0 while test -d /dev/.udev/queue; do sleep 0.1; test "$loop" -gt 300 && break loop=3D$(($loop + 1)) done #einfo "loop =3D $loop" eend 0 return 0 } seed_dev() { # Seed /dev with some things that we know we need ebegin "Seeding /dev with needed nodes" # copy over any persistant things if [[ -d /lib/udev/devices ]] ; then cp --preserve=3Dall --recursive --update /lib/udev/devices/* /dev fi # Not provided by sysfs but needed ln -snf /proc/self/fd /dev/fd ln -snf fd/0 /dev/stdin ln -snf fd/1 /dev/stdout ln -snf fd/2 /dev/stderr [[ -e /proc/kcore ]] && ln -snf /proc/kcore /dev/core # Create problematic directories mkdir -p /dev/{pts,shm} eend 0 } main() { # Setup temporary storage for /dev ebegin "Mounting /dev for udev" if [[ ${RC_USE_FSTAB} =3D "yes" ]] ; then mntcmd=3D$(get_mount_fstab /dev) else unset mntcmd fi if [[ -n ${mntcmd} ]] ; then try mount -n ${mntcmd} else if egrep -qs tmpfs /proc/filesystems ; then mntcmd=3D"tmpfs" else mntcmd=3D"ramfs" fi # many video drivers require exec access in /dev #92921 try mount -n -t ${mntcmd} udev /dev -o exec,nosuid,mode=0755 fi eend $? # Create a file so that our rc system knows it's still in sysinit. # Existance means init scripts will not directly run. # rc will remove the file when done with sysinit. touch /dev/.rcsysinit # Selinux lovin; /selinux should be mounted by selinux-patched init if [[ -x /sbin/restorecon && -c /selinux/null ]] ; then restorecon /dev &> /selinux/null fi # Actually get udev rolling if [[ ${RC_DEVICE_TARBALL} =3D "yes" && \ -s /lib/udev-state/devices.tar.bz2 ]] ; then ebegin "Populating /dev with saved device nodes" try tar -jxpf /lib/udev-state/devices.tar.bz2 -C /dev eend $? fi seed_dev # Setup hotplugging (if possible) ebegin "Setting up proper hotplug agent" if [[ -e /proc/sys/kernel/hotplug ]] ; then if [ "$(get_KV)" -gt "$(KV_to_int '2.6.14')" ] ; then einfo " Using netlink for hotplug events..." echo "" > /proc/sys/kernel/hotplug elif [[ $(udev_version) -ge "48" ]] ; then einfo " Setting /sbin/udevsend as hotplug agent ..." echo "/sbin/udevsend" > /proc/sys/kernel/hotplug elif [[ -x /sbin/hotplug ]] ; then einfo " Using /sbin/hotplug as hotplug agent ..." else einfo " Setting /sbin/udev as hotplug agent ..." echo "/sbin/udev" > /proc/sys/kernel/hotplug fi fi eend 0 ebegin "Starting udevd" /sbin/udevd --daemon eend $? populate_udev # Create nodes that udev can't ebegin "Finalizing udev configuration" [[ -x /sbin/dmsetup ]] && /sbin/dmsetup mknodes &>/dev/null [[ -x /sbin/lvm ]] && \ /sbin/lvm vgscan -P --mknodes --ignorelockingfailure &>/dev/null # Running evms_activate on a LiveCD causes lots of headaches [[ -z ${CDBOOT} ]] && [[ -x /sbin/evms_activate ]] && \ /sbin/evms_activate -q &>/dev/null eend 0 } main # vim:ts=3D4 ------------------------------------------------------------------------- Take Surveys. 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