Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754036AbZKNGfZ (ORCPT ); Sat, 14 Nov 2009 01:35:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752678AbZKNGfX (ORCPT ); Sat, 14 Nov 2009 01:35:23 -0500 Received: from mail-px0-f180.google.com ([209.85.216.180]:36800 "EHLO mail-px0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752467AbZKNGfU (ORCPT ); Sat, 14 Nov 2009 01:35:20 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=Ho2WVi9ORxi+fnUiiDtloQMCUDWf/CyhEcDw4jhxbSzsljLNM13173p+LP2iAZSlQq vk0VGROyer2LpZXdPGzGgn9FJ3ydJsmd/eI2GBdNLMkoyh1GnkmfoyVKnNxJx9lVWrKv fD2TGJIPnUWrzJdx4kkccXh8RTocAYu0rCqR0= From: Wu Zhangjin To: rostedt@goodmis.org, Ralf Baechle Cc: Wu Zhangjin , Frederic Weisbecker , Ingo Molnar , Nicholas Mc Guire , David Daney , Richard Sandiford , Patrik Kluba , Thomas Gleixner , Michal Simek , "Maciej W . Rozycki" , linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, zhangfx@lemote.com, zhouqg@gmail.com Subject: [PATCH v8 09/16] tracing: define a new __time_notrace annotation flag Date: Sat, 14 Nov 2009 14:33:24 +0800 Message-Id: X-Mailer: git-send-email 1.6.2.1 In-Reply-To: <99ebd8fcb19e4cccd702fca966405ffc45f8540b.1258177321.git.wuzhangjin@gmail.com> References: <9dc81a7a9e5a292cccdf465c533a2b08d19d6021.1258177321.git.wuzhangjin@gmail.com> <8f579e2cece16cd22358a4ec143ef6a8c462639b.1258177321.git.wuzhangjin@gmail.com> <7c7568247ad6cc109ec20387cfc3ca258d1d430f.1258177321.git.wuzhangjin@gmail.com> <3fcaffcfb3c8c8cd3015151ed5b7480ccaecde0f.1258177321.git.wuzhangjin@gmail.com> <48676d84140dbafd46e530611766121e18abc4ef.1258177321.git.wuzhangjin@gmail.com> <99ebd8fcb19e4cccd702fca966405ffc45f8540b.1258177321.git.wuzhangjin@gmail.com> In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1975 Lines: 64 From: Wu Zhangjin Ftrace gets the timestamp via time relative functions, when enabling function graph tracer, if we also trace these functions, the system will go into recusion and then hang there. So, we must not trace them. and there are two existing methods help this job. The first one is annotating them with notrace, another method is removing the -pg for the whole file which included them: CFLAGS_REMOVE_ftrace.o = -pg But there is a particular situation, that is some archs(i.e MIPS, Microblaze) need to notrace the common time relative source code, we can not simply annotate them with the above methods, but need to consider the archs respectively. this patch does it! This patch introduce a new annotation flag: __time_notrace, if your platform need it, define it in your arch specific ftrace.h: #define __time_notrace notrace if only function graph trace need it, wrap it: #ifdef CONFIG_FUNCTION_GRAPH_TRACER #define __time_notrace notrace #endif otherwise, ignore it! Signed-off-by: Wu Zhangjin --- include/linux/ftrace.h | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index 0b4f97d..c3f2f0f 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -511,4 +511,16 @@ static inline void trace_hw_branch_oops(void) {} #endif /* CONFIG_HW_BRANCH_TRACER */ +/* arch specific notrace for time relative functions, If your arch need it, + * define it in the arch specific ftrace.h + * + * #define __time_notrace notrace + * + * otherwise, ignore it! + */ + +#ifndef __time_notrace + #define __time_notrace +#endif + #endif /* _LINUX_FTRACE_H */ -- 1.6.2.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" 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/