>Number: 153123
>Category: conf
>Synopsis: [rc] add gsched rc file to automatically insert gsched on top
>of storage device(s)
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Mon Dec 13 15:40:06 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: David Naylor
>Release: FreeBSD-current
>Organization:
Private
>Environment:
FreeBSD dragon.dg 9.0-CURRENT FreeBSD 9.0-CURRENT #0: Tue Nov 9 22:34:47 SAST
2010 [email protected]:/tmp/home/freebsd9/src/sys/DRAGON amd64
>Description:
Add a gsched rc file to automatically insert gsched on top of a storage
device(s). The rc file inserts the scheduler on startup and removes the
scheduler on shutdown. It could also be integrated into devd.
I have used this without incident with the following in my rc.conf:
gsched_enable="YES"
gsched_devs="ad4 ad8"
There are two issues when using the following for devd:
notify 100 {
match "system" "DEVFS";
match "subsystem" "CDEV";
match "type" "CREATE";
match "cdev" "(ad|ada|cd|da)[0-9]+";
action "/etc/rc.d/gsched start $cdev";
};
1) a scheduler insert is attempted twice on startup (devd appears to run the
script when it is first run)
2) using the above to insert a scheduler on a memory stick causes KDE (via hal,
I assume) to loose the labels.
>How-To-Repeat:
>Fix:
Patch attached with submission follows:
#!/bin/sh
#
# $FreeBSD$
#
# Specify gsched_enable="YES" in /etc/rc.conf(.local) to activate scheduling on
# storage devices.
#
# gsched_devs is a space separated list of accepted devices. `ALL' may be used
# to indicate all storage devices.
#
# gsched_flags_$dev specifies storage device specific flags (i.e. ``-a rr'' to
# use rr scheduling, see gsched(8) insert command).
# TODO:
# - add gsched profiles, such as `desktop' for kern.geom.sched.rr tunables
# - add rejected list
# PROVIDE: gsched
# KEYWORD: nojail
. /etc/rc.subr
gsched_enable=${gsched_enable:-NO}
name="gsched"
rcvar=`set_rcvar`
command="/sbin/${name}"
start_cmd="gsched_start"
stop_cmd="gsched_stop"
gsched_filter() {
local _gsched_devs _devs _devs_recon _kern_disks
_kern_disks=`sysctl -n kern.disks`
_devs=$*
if [ -z "${_devs}" ]; then
_devs=${_kern_disks}
fi
_gsched_devs=${gsched_devs}
case ${_gsched_devs} in
[aA][lL][lL])
_gsched_devs=${_kern_disks}
;;
esac
for _g in ${_devs}; do
# Filter all devs that are part of gsched_devs
case " ${_gsched_devs} " in
*\ ${_g}\ *)
# Filter all devs that exist
case " ${_kern_disks} " in
*\ ${_g}\ *)
# ${_g} is part of ${gsched_dev} and it exists
_devs_recon="${_devs_recon} ${_g}"
;;
esac
;;
esac
done
echo ${_devs_recon}
}
gsched_start()
{
local _devs _g _gsched_flags
# Make sure only accepted (and existing) devices are used
#
_devs=`gsched_filter $*`
echo -n "Starting gsched devices:"
for _g in ${_devs}; do
echo -n " $_g"
eval _gsched_flags=\$gsched_flags_${_g}
${command} insert ${_gsched_flags} ${_g}
done
echo "."
}
gsched_stop() {
local _devs _g
# Make sure only accepted (and existing) devices are used
#
_devs=`gsched_filter $*`
echo -n "Stopping gsched devices:"
for _g in ${_devs}; do
echo -n " $_g"
${command} destroy ${_g}.sched.
done
echo "."
}
load_rc_config $name
run_rc_command $*
>Release-Note:
>Audit-Trail:
>Unformatted:
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