From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761911AbZE1Bgj (ORCPT ); Wed, 27 May 2009 21:36:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760327AbZE1BgT (ORCPT ); Wed, 27 May 2009 21:36:19 -0400 Received: from rv-out-0506.google.com ([209.85.198.234]:60703 "EHLO rv-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759931AbZE1BgR (ORCPT ); Wed, 27 May 2009 21:36:17 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:reply-to:to:cc:in-reply-to:references:content-type :organization:date:message-id:mime-version:x-mailer :content-transfer-encoding; b=VIpFXYxUFbLVwMiy8PMkR8YKy6i8HrtzOFRTrAwF612N0qIO8nSxTRAgUAlR2q1FPR EcmVr+ua7GGTiR4MXT8TxCcOFQkWNgnTqS9jYm8tXEsNH7bRnFMTMG0ldSNc2KH8DfaF SEzDcM+KR/5AB//Q201jrLMQJXqlBgrRpq2Is= Subject: [RESEND] [PATCH 1/2 V3] ftrace: fix typo about map of kernel priority in ftrace.txt file. From: GeunSik Lim Reply-To: leemgs1@gmail.com To: Ingo Molnar Cc: linux-kernel , linux-rt-users , tglx , williams , Steven Rostedt , Peter Zijlstra In-Reply-To: <1242884360.31161.77.camel@centos51> References: <1242884360.31161.77.camel@centos51> Content-Type: text/plain Organization: Private Date: Thu, 28 May 2009 10:36:11 +0900 Message-Id: <1243474571.14685.37.camel@centos51> Mime-Version: 1.0 X-Mailer: Evolution 2.8.0 (2.8.0-40.el5_1.1) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>From 5764d50e29e08d86f7f3b7dff66d7c1ad4762ff8 Mon Sep 17 00:00:00 2001 From: GeunSik,Lim 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 Acked-by : Steven Rostedt CC : Ingo Molnar --- 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/ -----------------------------------------------