Re: [PATCH] scheduling priorities with rlimit

[Arjan van de Ven]

On Sun, 2005-01-09 at 18:15 +0100, utz lehmann wrote:
> Hi
> 
> I really like the idea of controlling the maximum settable scheduling
> priorities via rlimit. See the Realtime LSM thread. I want to give users
> the right to raise the priority of previously niced jobs.
> 
> I have modified Chris Wright's patch (against 2.6.10):
> (http://marc.theaimsgroup.com/?l=linux-kernel&m=110513793228776&w=2)
> 
> - allow always to increase nice levels (lower priority).
> - set the default for RLIMIT_PRIO to 0.
> - add the other architectures.
> 
> With this the default is compatible with the old behavior.
> 
> With RLIMIT_PRIO > 0 a user is able to raise the priority up to the
> value. 0-39 for nice levels 19 .. -20, 40-139 for realtime priorities
> (0 .. 99).

this is a bit of an awkward interface don't you think?
I much rather have the rlimit match the exact nice values we communicate
to userspace elsewhere, both to be consistent and to not expose
scheduler internals to userpsace.


Also I like the idea of allowing sysadmins to make certain users/groups
nice levels 5 and higher (think a university machine that makes all
students nice 5 and higher only, while giving staff 0 and higher, and
the sysadmin -5 and higher ;)

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