[systemd-devel] specialized user sessions for running large processes

[Thomas Blume]

Hi,

there is some large software like SAP or Oracle out there that need to
be started/stopped via special users.

At system boot, they get started via a user session and inherit the 
restrictions from the user slice.
That is not really appropriate for such large processes as they usually
need higher resource limits than normal users.
Hence, they should get rather attached below the system slice (or a
dedicated custom slice below -.slice) 
Also, those specialized users, don't need a full blown user session but
only that much environment which is necessary for doing their management
tasks.
Unfortunately, pam_systemd enforces all users to get attached below the
user.slice at login.

So, what I need would be the possibility to put a user outside the user
slice and/or start a customized session instead of a normal user
session.

I'm looking for the best approach to get this.
Would a patch to pam_systemd, that allows the setup of such specialized
user sessions be acceptable?
If not, are there any other ideas to get this?

Thanks and regards
Thomas