Hallo Alex,
On Mon, Mar 28, 2011 at 03:48:25PM +0200, Alexander Reichle-Schmehl wrote:
> When running any programm shiped in rt-tests as non-root user, one is
> greeted with something similar to:
>
> Unable to change scheduling policy!
> either run as root or join realtime group
>
>
> However, there doesn't seem such a group, nor is it documented how to
> create it and which privileges this group would need.
yeah, the message is misleading. I guess there is a realtime group on
redhat-based distros that has the needed capabilities. Actually the
message should better talk about sched_setscheduler(2), RLIMIT_RTPRIO
and so maybe limits.conf(5).
E.g. after adding
@users hard rtprio 20
@users soft rtprio 20
to /etc/security/limits.conf I'm able to run the rt test programs as
ordinary user. I will check with upstream how to make the message more
clear.
> Also, I'm wonderung if these programms should be shipped in /usr/sbin/
> instead of /usr/bin.
I'm not sure. The FHS says about /usr/sbin:
This directory contains any non-essential binaries used
exclusively by the system administrator.
On one hand the tests in the rt-tests package are not related to
administration; on the other hand you probably don't want a random user
of your system run hackbench and cyclictest at a high priority.
All in all I think /usr/bin is OK.
Best regards and thanks,
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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