linux-kernel - [PATCH 1/1 ,v3] ftrace: fix typo in ftrace.txt file

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Message-Id: <1242884365.31161.78.camel@centos51>
Date:	Thu, 21 May 2009 14:39:25 +0900
From:	GeunSik Lim <leemgs1@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	williams <williams@...hat.com>, tglx <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/1 ,v3] ftrace: fix typo in ftrace.txt file


-- 

commit 16d92cb2334b19751db851d221aab814cd9da1af
Author: GeunSik,Lim <leemgs1@...il.com>
Date:   Thu May 21 14:31:17 2009 +0900

            ftrace: fix typo 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@...sung.com>

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:
 

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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/
-----------------------------------------------

View attachment "fix-typo-chart-map-priority-ftrace.v3.patch" of type "text/x-patch" (2662 bytes)