[PATCH 0/1 ,v3] sched: fix typo in sched-rt-group.txt file

GeunSik Lim
2009-05-21T05:39:20Z

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Dear Ingo,

I made 2 patch files again about static prioriy levels to map between kernel-space
and usper-space according to opinions and helps from Peter, Ingo, Steven.

Fix static priority related range and chart map(userspace/kernelspace) of ftrace.
- about chart map of static priority in ftrace.txt file
- about static priority levels(range) in sched-rt-group.txt file

Please, drop my previous version and merge this.

Changelog since V3
o Modified kernel static priority to map user rt priority ( 99 ~ 1).
- Archives: http://marc.info/?l=linux-kernel&m=124279443511114&w=2
- before : Kernel priority: 0(high) to 99(low) --> user RT priority 99(high) to 1(low)
- after : Kernel priority: 0(high) to 98(low) --> user RT priority 99(high) to 1(low)

Changelog since V2
o Modified description static priority(SCHED_FIFO,SCHED_RR) levels of user-space using sched_setscheduler(2)
- Archives: http://marc.info/?t=124211992800003&r=1&w=2
- before : Kernel priority: 0(high) to 99(low) --> user RT priority 99(high) to 0(low)
- after : Kernel priority: 0(high) to 99(low) --> user RT priority 99(high) to 1(low)
o Modified static priority related quick chart of sched_switch section in ./Documentation/trace/ftrace.txt file

Changelog since V1
o Changed static priority levels of kernel-space. ( 0 ~ 139 --> 0-99 ) in sched-rt-group.txt file

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(high) to 98(low) --> User Space RT priority 99(high) to 1(low) with SCHED_RR or SCHED_FIFO
* Kernel Space priority 99 --> sched_priority is not used in scheduling decisions (it must be specified as 0)
* Kernel Space priority 100(high) to 139(low)--> User Space nice -20(high) to 19(low)

For processes scheduled under one of the normal scheduling policies
(SCHED_OTHER, SCHED_IDLE, SCHED_BATCH), sched_priority is not used in
scheduling decisions (it must be specified as 0).

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).
(reference: http://www.kernel.org/doc/man-pages/online/pages/man2/sched_setscheduler.2.html)

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
do deadline inheritance (since priority is inversely proportional to the
deadline delta (deadline - now).

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GeunSik Lim (ELS - OS Group - S/W Lab - SAIT - SAMSUNG)
e-Mail :1) geunsik.lim@samsung.com
2) leemgs@gmail.com , leemgs1@gmail.com
HomePage: http://intomail.dnip.net/invain/me/
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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(high) to 98(low) --> User Space RT priority 99(high) to 1(low) with SCHED_RR or SCHED_FIFO
* Kernel Space priority 99 --> sched_priority is not used in scheduling decisions (it must be specified as 0)
* Kernel Space priority 100(high) to 139(low)--> User Space nice -20(high) to 19(low)

For processes scheduled under one of the normal scheduling policies
(SCHED_OTHER, SCHED_IDLE, SCHED_BATCH), sched_priority is not used in
scheduling decisions (it must be specified as 0).

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).
(reference: http://www.kernel.org/doc/man-pages/online/pages/man2/sched_setscheduler.2.html)

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
do deadline inheritance (since priority is inversely proportional to the
deadline delta (deadline - now).