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Date: Thu, 21 May 2009 14:39:20 +0900
From: GeunSik Lim <leemgs1@...il.com>
To: Ingo Molnar <mingo@...e.hu>
Cc: linux-kernel <linux-kernel@...r.kernel.org>,
linux-rt-users <linux-rt-users@...r.kernel.org>,
tglx <tglx@...utronix.de>, williams <williams@...hat.com>,
Steven Rostedt <rostedt@...dmis.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH 0/1 ,v3] sched: fix typo in sched-rt-group.txt file
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@...il.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@...sung.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@...sung.com
2) leemgs@...il.com , leemgs1@...il.com
HomePage: http://intomail.dnip.net/invain/me/
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