Messages in this thread | | | Subject | Re: Where is RLIMIT_RT_CPU? | From | Lee Revell <> | Date | Sat, 15 Jul 2006 09:58:15 -0400 |
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On Sat, 2006-07-15 at 09:20 +1000, Jean-Marc Valin wrote: > > Can't you just make a prio 1 task which signals a prio 99 once say every > > second. If the priority 99 task doesn't get the signal after say 2 > > seconds, it will look for a rt task running wild. At worst it will have to do > > an O(n) algorith when things have gone wrong, not when everything is > > working. > > Well, that would work in sort of preventing a complete lockup, but the > watchdog wouldn't even know if the task eating lots of CPU is privileged > (OK) or unprivileged (not OK). Also, the original RLIMIT_RT_CPU feature > allowed you to really control how much CPU is available to unprivileged > users, not just prevent them from getting 100% CPU.
Non-root RT tasks are not "unprivileged" - they have a level of privileges between a normal user and root. Really I think it's OK for these tasks to consume 100% CPU, as the admin has explicitly allowed it.
The only problem is that Ubuntu shipped with this enabled for everyone.
Lee
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