Higher priority for root processes

Hello,
I need to set a higher priority for sshd and sshguard processes, but I can't find a way. On my server, there are 2 types of users (faculty and student with corresponding groups) plus the root. Moreover, I need a realtime group.

Users from group faculty (also student, if needed) need to be able to ssh even if the server RAM is almost full.

Here is my limits.conf:

Code:root soft priority -15
@faculty soft priority -5
@student soft priority 0
@realtime soft priority -10

root hard nice -20
@faculty hard nice -10
@student hard nice -5
@realtime hard nice -15

@faculty hard nofile 16384
@faculty soft nofile 16384
@realtime soft rtprio 99
@realtime soft memlock 500000However, at startup processes from faculty run with default priority 10 and niceness -10, while root processes run with default priority 20 and niceness 0.

How can I make root processes run with default priority lower than other groups?