Re: [patch, 2.6.11-rc2] sched: RLIMIT_RT_CPU_RATIO feature

[Ingo Molnar]

* Nick Piggin <nickpiggin@xxxxxxxxxxxx> wrote:

> And finally, with rlimit support, is there any reason why lockup
> detection and correction can't go into userspace? Even RT throttling
> could probably be done in a userspace daemon.

that is correct. Jackd already has a watchdog thread, against lockups.

i'm wondering, couldnt Jackd solve this whole issue completely in
user-space, via a simple setuid-root wrapper app that does nothing else
but validates whether the user is in the 'jackd' group and then keeps a
pipe open to to the real jackd process which it forks off, deprivileges
and exec()s? Then unprivileged jackd could request RT-priority changes
via that pipe in a straightforward way. Jack normally gets installed as
root/admin anyway, so it's not like this couldnt be done.

	Ingo
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