Allow guests to have a system priority using renice

lib/vm-rctl

@@ -28,25 +28,29 @@
 # set limits to virtual machine
 # this is the background process
 #
-rctl::set_limits(){
+rctl::set(){
     local _pcpu _rbps _wbps _riops _wiops
-    local _pid
+    local _pid _pri
 
     # get limit settings
+    config::get "_pri" "priority"
     config::get "_pcpu" "limit_pcpu"
     config::get "_rbps" "limit_rbps"
     config::get "_wbps" "limit_wbps"
     config::get "_riops" "limit_riops"
     config::get "_wiops" "limit_wiops"
 
-    # return if there are no limits
-    [ -z "${_pcpu}${_rbps}${_wbps}${_riops}${_wiops}" ] && return 1
-
     # wait till bhyve starts and get pid
     sleep 1
     _pid=$(pgrep -fx "bhyve: ${_name}")
     [ -z "${_pid}" ] && return 1
 
+    # check for a priority
+    [ -n "${_pri}" ] && renice ${_pri} ${_pid} >/dev/null 2>&1
+
+    # return if there are no limits
+    [ -z "${_pcpu}${_rbps}${_wbps}${_riops}${_wiops}" ] && return 1
+
     # see if rctl works
     /usr/bin/rctl >/dev/null 2>&1
     [ $? -ne 0 ] && \