Re: [PATCH 2/2] sched: allow users with rtprio rlimit to changefrom SCHED_IDLE policy

[Peter Zijlstra]

On Tue, 2011-02-22 at 13:04 -0800, Darren Hart wrote:
> As it stands, users with rtprio rlimit permissions can change their policy from
> SCHED_OTHER to SCHED_FIFO and back. They can change to SCHED_IDLE, but not back
> to SCHED_FIFO. If they have the rtprio permission, they should be able to. Once
> in SCHED_FIFO, they could go back to SCHED_OTHER. This patch allows users with
> rtprio permission to change out of SCHED_IDLE.
> 

Ingo, can you remember the rationale for this?

The fact is that SCHED_IDLE is very near nice-20, and we can do:

peterz@twins:~$ renice 5 -p $$
1867: old priority 0, new priority 5
peterz@twins:~$ renice 0 -p $$
1867: old priority 5, new priority 0

Which would suggest that we should be able to return to SCHED_OTHER
RLIMIT_NICE-20.

Hmm?

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