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

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Date:	Wed, 20 May 2009 10:41:32 +0900
From:	GeunSik Lim <leemgs1@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	tglx <tglx@...utronix.de>, williams <williams@...hat.com>
Subject: [PATCH 1/1] ftrace: fix typo in ftrace.txt file



commit 43bf3fdddfd6b0ac65ef59bec3c79d9f9064e8bd
Author: GeunSik,Lim <leemgs1@...il.com>
Date:   Thu May 14 13:39:18 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 static priority in the range 1 to 99.
    
        Signed-off-by: GeunSik Lim <geunsik.lim@...sung.com>

diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index fd9a3e6..0e17632 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -518,9 +518,14 @@ 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 priority: 0(high) to 99(low)    ==> user RT priority 99(high) to 1(low)
+ Kernel priority: 100(high) to 139(low) ==> user nice -20(high) to 19(low)
+ Kernel priority: 140                   ==> idle task priority
+
+Processes scheduled with SCHED_OTHER or SCHED_BATCH must be assigned
+the static priority 0. Processes scheduled under SCHED_FIFO or SCHED_RR 
+can have a static priority in the range 1 to 99. 
+ (reference: $> man 2 sched_setscheduler)
 
 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.patch" of type "text/x-patch" (1501 bytes)