[LITMUS^RT] Tutorial's demo scheduling plug-in conplications

[Brittany Subialdea]

Hello,

I have installed litmus rt and liblitmus. I continued with the tutorial and
included the demo file with the other plugins. I added it to the Makefile
but when I run 'setsched DEMO' the result is:
          Error: cannot write to /proc/litmus/active_plugin. Do you have
root privileges?
          Error: Setting new plugin failed.
          Are there any active real time tasks?

I used sudo su so I should have permissions to the files.
Similarly, when running 'setsched' alone the demo plugin is not included in
the list. My adviser and I have both run through reinstalling but with the
same results.  I was wondering if you might know what is causing this. ​

Thank you,
Brittany
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