On 2013-12-19 Thu 13:43 PM |, Craig R. Skinner wrote:
> Enhance rc.d/rc.subr with lowered/raised daemon running priority.
>
Comments/testing observations/?
ksh syntax used (which works with /bin/sh & bin/ksh being the same
binary), but dinnae ken if that's "wrong"... for rc* stuff.
> Use renice as simple nice didn't always work on daemons started in the
> background. Niceness level sanity checked, defaulting to 10.
>
> Index: rc.subr
> ===================================================================
> RCS file: /cvs/src/etc/rc.d/rc.subr,v
> retrieving revision 1.70
> diff -u -u -p -r1.70 rc.subr
> --- rc.subr 11 Jul 2013 09:34:33 -0000 1.70
> +++ rc.subr 19 Dec 2013 13:17:45 -0000
> @@ -104,6 +104,25 @@ rc_wait() {
> return 1
> }
>
> +rc_reprioritise()
> +{
> + [[ ${rc_renice} != 'YES' ]] &&
> + {
> + for _renice_level in $(jot 40 20 -20)
> + do
> + [[ ${rc_renice} == ${_renice_level} ]] &&
> + {
> + _scheduling_priority=${rc_renice}
> + break
> + }
> + done
> + }
> +
> + [[ -z ${_scheduling_priority} ]] && _scheduling_priority='10'
> +
> + renice -n ${_scheduling_priority} -p $(pgrep -f "^${pexp}")
> +}
> +
> rc_cmd() {
> local _bg _n
>
> @@ -136,6 +155,17 @@ rc_cmd() {
> fi
> [ -z "${INRC}" ] && rc_do rc_check && exit 0
> echo $_n "${INRC:+ }${_name}"
> +
> + [[ ${rc_renice} == 'NO' ]] && unset rc_renice
> + [[ -n ${rc_renice} ]] &&
> + {
> + printf "%d" ${rc_renice} > /dev/null 2>&1 &&
> + {
> + rc_renice=$(printf "%d" ${rc_renice})
> + [[ ${rc_renice} -eq 0 ]] && unset rc_renice
> + }
> + }
> +
> while true; do # no real loop, only needed to break
> if type rc_pre >/dev/null; then
> rc_do rc_pre || break
> @@ -148,6 +178,7 @@ rc_cmd() {
> rc_do rc_wait start || break
> fi
> rc_do rc_write_runfile
> + [[ -n ${rc_renice} ]] && rc_do rc_reprioritise
> rc_exit ok
> done
> # handle failure
>
