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SubjectRe: [tip:sched/core] sched/core: Document that RT task priorities are 1...99
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On 2019-04-16, Sebastian Andrzej Siewior <bigeasy@linutronix.de> wrote:
> On 2019-04-16 11:36:34 [+0200], Peter Zijlstra wrote:
>> On Tue, Apr 16, 2019 at 01:13:11AM -0700, tip-bot for Sebastian Andrzej Siewior wrote:
>> > Commit-ID: 37a8f8590f307db8f8cfa62dfd82b3fc0978607c
>> > Gitweb: https://git.kernel.org/tip/37a8f8590f307db8f8cfa62dfd82b3fc0978607c
>> > Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
>> > AuthorDate: Wed, 3 Apr 2019 23:08:21 +0200
>> > Committer: Ingo Molnar <mingo@kernel.org>
>> > CommitDate: Tue, 16 Apr 2019 10:06:08 +0200
>> >
>> > sched/core: Document that RT task priorities are 1...99
>> >
>> > John identified three files which claim that RT task priorities start at
>> > zero. As far as I understand, 0 is used for DL and has nothing to do
>> > wihich RT priorities as identified by the RT policy.
>>
>> DL is -1, 0 is still very much FIFO/FF
>
> but it can't be set. The lowest we can set is 1. Is this a bug then?

I think it is important to clarify if you are talking about userspace or
kernel. They are different. For userspace 1(low)-99(high) is
allowed. For kernel 0(high)-98(low) is used.

John Ogness

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