* [PATCH 0/1 ,v3] sched: fix typo in sched-rt-group.txt file
@ 2009-05-21 5:39 GeunSik Lim
2009-05-28 1:36 ` [RESEND] [PATCH 0/2 V3] description about static priority GeunSik Lim
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: GeunSik Lim @ 2009-05-21 5:39 UTC (permalink / raw)
To: Ingo Molnar
Cc: linux-kernel, linux-rt-users, tglx, williams, Steven Rostedt,
Peter Zijlstra
[-- Attachment #1: Type: text/plain, Size: 3695 bytes --]
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/
-----------------------------------------------
[-- Attachment #2: fix-typo-static-priority-levels-sched-rt-group.v3.patch --]
[-- Type: text/x-patch, Size: 1769 bytes --]
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).
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [RESEND] [PATCH 0/2 V3] description about static priority.
2009-05-21 5:39 [PATCH 0/1 ,v3] sched: fix typo in sched-rt-group.txt file GeunSik Lim
@ 2009-05-28 1:36 ` GeunSik Lim
2009-05-28 13:06 ` Peter Zijlstra
2009-05-28 1:36 ` [RESEND] [PATCH 1/2 V3] ftrace: fix typo about map of kernel priority in ftrace.txt file GeunSik Lim
2009-05-28 1:36 ` [RESEND] [PATCH 2/2 V3] sched: fix typo in sched-rt-group.txt file GeunSik Lim
2 siblings, 1 reply; 6+ messages in thread
From: GeunSik Lim @ 2009-05-28 1:36 UTC (permalink / raw)
To: Ingo Molnar
Cc: linux-kernel, linux-rt-users, tglx, williams, Steven Rostedt,
Peter Zijlstra
--
>From c2e8f308730c87010d50a72f80ede6b7f308497e Mon Sep 17 00:00:00 2001
From: GeunSik,Lim <leemgs1@gmail.com>
Date: Thu, 28 May 2009 10:08:00 +0900
Subject: [PATCH 0/2] description about static priority.
Dear Ingo Molnar,
This is static priority description related patch files.
Please, merge my patch.
Thanks,
GeunSik,Lim (2):
ftrace: fix typo about map of kernel priority in ftrace.txt file.
sched: fix typo in sched-rt-group.txt file
Documentation/scheduler/sched-rt-group.txt | 2 +-
Documentation/trace/ftrace.txt | 15 ++++++++++++---
2 files changed, 13 insertions(+), 4 deletions(-)
-----------------------------------------------
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Please read the FAQ at http://www.tux.org/lkml/
GeunSik Lim ( S A M S U N G E L E C T R O N I C S )
e-Mail :1) geunsik.lim@samsung.com
2) leemgs@gmail.com , leemgs1@gmail.com
HomePage: http://blog.naver.com/invain/
-----------------------------------------------
^ permalink raw reply [flat|nested] 6+ messages in thread
* [RESEND] [PATCH 1/2 V3] ftrace: fix typo about map of kernel priority in ftrace.txt file.
2009-05-21 5:39 [PATCH 0/1 ,v3] sched: fix typo in sched-rt-group.txt file GeunSik Lim
2009-05-28 1:36 ` [RESEND] [PATCH 0/2 V3] description about static priority GeunSik Lim
@ 2009-05-28 1:36 ` GeunSik Lim
2009-05-28 1:36 ` [RESEND] [PATCH 2/2 V3] sched: fix typo in sched-rt-group.txt file GeunSik Lim
2 siblings, 0 replies; 6+ messages in thread
From: GeunSik Lim @ 2009-05-28 1:36 UTC (permalink / raw)
To: Ingo Molnar
Cc: linux-kernel, linux-rt-users, tglx, williams, Steven Rostedt,
Peter Zijlstra
>From 5764d50e29e08d86f7f3b7dff66d7c1ad4762ff8 Mon Sep 17 00:00:00 2001
From: GeunSik,Lim <leemgs1@gmail.com>
Date: Thu, 28 May 2009 09:57:28 +0900
Subject: [PATCH 1/2] ftrace: fix typo about map of kernel priority in ftrace.txt file.
Fix typo about chart to map the kernel priority to user land priorities.
* About sched_setscheduler(2)
Processes scheduled under SCHED_FIFO or SCHED_RR
can have a (user-space) static priority in the range 1 to 99.
(reference: http://www.kernel.org/doc/man-pages/online/pages/
man2/sched_setscheduler.2.html)
* From: Steven Rostedt
0 to 98 - maps to RT tasks 99 to 1 (SCHED_RR or SCHED_FIFO)
99 - maps to internal kernel threads that want to be lower than RT tasks
but higher than SCHED_OTHER tasks. Although I'm not sure if any
kernel thread actually uses this. I'm not even sure how this can be
set, because the internal sched_setscheduler function does not allow
for it.
100 to 139 - maps nice levels -20 to 19. These are not set via
sched_setscheduler, but are set via the nice system call.
140 - reserved for idle tasks.
Signed-off-by: GeunSik Lim <geunsik.lim@samsung.com>
Acked-by : Steven Rostedt <rostedt@goodmis.org>
CC : Ingo Molnar <mingo@elte.hu>
---
Documentation/trace/ftrace.txt | 15 ++++++++++++---
1 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index fd9a3e6..e362f50 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -518,9 +518,18 @@ priority with zero (0) being the highest priority and the nice
values starting at 100 (nice -20). Below is a quick chart to map
the kernel priority to user land priorities.
- Kernel priority: 0 to 99 ==> user RT priority 99 to 0
- Kernel priority: 100 to 139 ==> user nice -20 to 19
- Kernel priority: 140 ==> idle task priority
+ Kernel Space User Space
+ ===============================================================
+ 0(high) to 98(low) user RT priority 99(high) to 1(low)
+ with SCHED_RR or SCHED_FIFO
+ ---------------------------------------------------------------
+ 99 sched_priority is not used in scheduling
+ decisions(it must be specified as 0)
+ ---------------------------------------------------------------
+ 100(high) to 139(low) user nice -20(high) to 19(low)
+ ---------------------------------------------------------------
+ 140 idle task priority
+ ---------------------------------------------------------------
The task states are:
--
1.6.3.1
-----------------------------------------------
To unsubscribe from this list: send the line "unsubscribe linux-***"
in the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
GeunSik Lim ( S A M S U N G E L E C T R O N I C S )
e-Mail :1) geunsik.lim@samsung.com
2) leemgs@gmail.com , leemgs1@gmail.com
HomePage: http://blog.naver.com/invain/
-----------------------------------------------
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [RESEND] [PATCH 2/2 V3] sched: fix typo in sched-rt-group.txt file
2009-05-21 5:39 [PATCH 0/1 ,v3] sched: fix typo in sched-rt-group.txt file GeunSik Lim
2009-05-28 1:36 ` [RESEND] [PATCH 0/2 V3] description about static priority GeunSik Lim
2009-05-28 1:36 ` [RESEND] [PATCH 1/2 V3] ftrace: fix typo about map of kernel priority in ftrace.txt file GeunSik Lim
@ 2009-05-28 1:36 ` GeunSik Lim
2 siblings, 0 replies; 6+ messages in thread
From: GeunSik Lim @ 2009-05-28 1:36 UTC (permalink / raw)
To: Ingo Molnar
Cc: linux-kernel, linux-rt-users, tglx, williams, Steven Rostedt,
Peter Zijlstra
>From c2e8f308730c87010d50a72f80ede6b7f308497e Mon Sep 17 00:00:00 2001
From: GeunSik,Lim <leemgs1@gmail.com>
Date: Thu, 28 May 2009 09:59:46 +0900
Subject: [PATCH 2/2] sched: fix typo in sched-rt-group.txt file
Fix typo about static priority's range.
Kernel Space User Space
===============================================================
0(high) to 98(low) user RT priority 99(high) to 1(low)
with SCHED_RR or SCHED_FIFO
---------------------------------------------------------------
99 sched_priority is not used in scheduling
decisions(it must be specified as 0)
---------------------------------------------------------------
100(high) to 139(low) user nice -20(high) to 19(low)
---------------------------------------------------------------
140 idle task priority
---------------------------------------------------------------
* ref) http://www.kernel.org/doc/man-pages/online/pages/man2/sched_setscheduler.2.html
Signed-off-by: GeunSik Lim <geunsik.lim@samsung.com>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
CC: Steven Rostedt <rostedt@goodmis.org>
---
Documentation/scheduler/sched-rt-group.txt | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
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).
--
1.6.3.1
-----------------------------------------------
To unsubscribe from this list: send the line "unsubscribe linux-***"
in the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
GeunSik Lim ( S A M S U N G E L E C T R O N I C S )
e-Mail :1) geunsik.lim@samsung.com
2) leemgs@gmail.com , leemgs1@gmail.com
HomePage: http://blog.naver.com/invain/
-----------------------------------------------
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [RESEND] [PATCH 0/2 V3] description about static priority.
2009-05-28 1:36 ` [RESEND] [PATCH 0/2 V3] description about static priority GeunSik Lim
@ 2009-05-28 13:06 ` Peter Zijlstra
2009-05-29 1:07 ` GeunSik Lim
0 siblings, 1 reply; 6+ messages in thread
From: Peter Zijlstra @ 2009-05-28 13:06 UTC (permalink / raw)
To: leemgs1
Cc: Ingo Molnar, linux-kernel, linux-rt-users, tglx, williams,
Steven Rostedt
On Thu, 2009-05-28 at 10:36 +0900, GeunSik Lim wrote:
> Please, merge my patch.
ok, I've queued them up for my next push to ingo.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [RESEND] [PATCH 0/2 V3] description about static priority.
2009-05-28 13:06 ` Peter Zijlstra
@ 2009-05-29 1:07 ` GeunSik Lim
0 siblings, 0 replies; 6+ messages in thread
From: GeunSik Lim @ 2009-05-29 1:07 UTC (permalink / raw)
To: Peter Zijlstra
Cc: Ingo Molnar, linux-kernel, linux-rt-users, tglx, williams,
Steven Rostedt
On Thu, May 28, 2009 at 10:06 PM, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:
> On Thu, 2009-05-28 at 10:36 +0900, GeunSik Lim wrote:
>> Please, merge my patch.
>
> ok, I've queued them up for my next push to ingo.
Thanks Peter.
>
>
--
Regards,
GeunSik Lim ( SAMSUNG ELECTRONICS)
Blog : http://blog.naver.com/invain/
e-Mail: geunsik.lim@samsung.com
leemgs@gmail.com , leemgs1@gmail.com
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To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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^ permalink raw reply [flat|nested] 6+ messages in thread
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2009-05-21 5:39 [PATCH 0/1 ,v3] sched: fix typo in sched-rt-group.txt file GeunSik Lim
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2009-05-28 13:06 ` Peter Zijlstra
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