linux-kernel - Re: Where is RLIMIT_RT

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Date:	Sat, 15 Jul 2006 09:20:40 +1000
From:	Jean-Marc Valin <Jean-Marc.Valin@...erbrooke.ca>
To:	Esben Nielsen <nielsen.esben@...glemail.com>
Cc:	Lee Revell <rlrevell@...-job.com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Where is RLIMIT_RT_CPU?

> 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. 

	Jean-Marc
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