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SubjectRe: [patch, 2.6.11-rc2] sched: RLIMIT_RT_CPU_RATIO feature
Jack O'Quin wrote:
> Peter Williams <pwil3058@bigpond.net.au> writes:
>
>
>>Paul Davis wrote:
>>
>>>There are several kernel-side attributes that would make JACK better
>>>from my perspective:
>>> * better ways to acquire and release RT scheduling
>>
>>I'm no expert on the topic but it would seem to me that the mechanisms
>>associated with the capable() function are intended to provide a
>>consistent and extensible interface to the control of privileged
>>operations with possible finer grained control than "root 'yes' and
>>everybody else 'no'". Maybe the way to solve this problem is to
>>modify the interpretation of capable(CAP_SYS_NICE) so that it returns
>>true when invoked by a task setuid to a nominated uid in addition to
>>zero?
>
>
> That is essentially what the RT-LSM does. At exec() time RT-LSM turns
> on CAP_SYS_NICE for appropriate process images.
>
> In the current implementation this is only done per-group not
> per-user. Adding UID as well as GID granularity should be easy. We
> didn't do it because we didn't really need it. If there's a use for
> it, I have no objection to adding it. It could even compatibly be
> added later.

If what you have is adequate I wouldn't suggest changing it. My use of
uid in my rant was just to illustrate a general idea.

>
> Many distributions require users to join group `audio' anyway to gain
> access to the sound card. We found it convenient to piggy-back on
> that mechanism.
>
> I believe Paul considers this adequate for his requirements. :-)

Peter
--
Peter Williams pwil3058@bigpond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
-- Ambrose Bierce
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