Messages in this thread | | | Date | Tue, 12 May 2009 11:42:10 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH]sched: fix typo in sched-rt-group.txt file |
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* Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:
> On Tue, 2009-05-12 at 17:37 +0900, GeunSik Lim wrote: > > > > > > Dear Ingo, > > > > I found typo about the range of static priority ( = realtime priority ) > > in "./Documentation/scheduler/sched-rt-group.txt" file. > > > > If I don't understand static priority levels, Correct me. > > Right, that 'confusion' stems from the fact that our in-kernel priority > lists do consider all 140 priorities. > > The patch looks good though. > > > commit d6af702008117ca489a2f5476239d1688a517e98 > > Author: GeunSik,Lim <leemgs1@gmail.com> > > Date: Tue May 12 17:20:32 2009 +0900 > > > > sched: fix typo in sched-rt-group.txt file > > > > Fix typo about static priority's range. > > Kernel Space priority: 0 to 99 --> User Space RT priority 99 to 0 > > Kernel Space priority: 100 to 139 --> User Space nice -20 to 19 > > > > Signed-off-by: GeunSik Lim <geunsik.lim@samsung.com> > > > > diff --git a/Documentation/scheduler/sched-rt-group.txt b/Documentation/scheduler/sched-rt-group.txt > > index 5ba4d3f..1537146 100644 > > --- a/Documentation/scheduler/sched-rt-group.txt > > +++ b/Documentation/scheduler/sched-rt-group.txt > > @@ -169,7 +169,7 @@ get their allocated time. > > > > Implementing SCHED_EDF might take a while to complete. Priority Inheritance is > > the biggest challenge as the current linux PI infrastructure is geared towards > > -the limited static priority levels 0-139. With deadline scheduling you need to > > +the limited static priority levels 0-99. With deadline scheduling you need to
SCHED_FIFO goes from 1 to 99. So it's either 0-98 or 1-99. From sched_setscheduler(2):
Processes scheduled under one of the real-time policies (SCHED_FIFO, SCHED_RR) have a sched_priority value in the range 1 (low) to 99 (high).
Ingo
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