From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756242AbZKIPcv (ORCPT ); Mon, 9 Nov 2009 10:32:51 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756161AbZKIPcu (ORCPT ); Mon, 9 Nov 2009 10:32:50 -0500 Received: from mail-ew0-f207.google.com ([209.85.219.207]:39623 "EHLO mail-ew0-f207.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756165AbZKIPcr (ORCPT ); Mon, 9 Nov 2009 10:32:47 -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=Bz1MCrU8tNcRA6/UKc3T/YENxR0sM/j7cgtzP8a94GrcDK5ezweRFauprMPfPTLaeR HvRIaXiOVULVnCdmZZ7LPiFckf7HImgjqhwCmH5/q6kK4wPfL8x7hCjK71siCMV1AvWG Ldl3iV/13ewIZVsfPUcGcUd0MJN+UU7MK51Xo= From: Wu Zhangjin To: linux-mips@linux-mips.org, linux-kernel@vger.kernel.org Cc: zhangfx@lemote.com, zhouqg@gmail.com, Wu Zhangjin , Ralf Baechle , rostedt@goodmis.org, Frederic Weisbecker , Ingo Molnar , Nicholas Mc Guire , David Daney , Richard Sandiford , Patrik Kluba , Thomas Gleixner , Michal Simek Subject: [PATCH v7 09/17] tracing: define a new __time_notrace annotation flag Date: Mon, 9 Nov 2009 23:31:26 +0800 Message-Id: <18e1d617ed824bb1c10f15216f2ed9ed3de78abd.1257779502.git.wuzhangjin@gmail.com> X-Mailer: git-send-email 1.6.2.1 In-Reply-To: <0cef783a71333ff96a78aaea8961e3b6b5392665.1257779502.git.wuzhangjin@gmail.com> References: <9dc81a7a9e5a292cccdf465c533a2b08d19d6021.1257779502.git.wuzhangjin@gmail.com> <8f579e2cece16cd22358a4ec143ef6a8c462639b.1257779502.git.wuzhangjin@gmail.com> <6199d7b3956b544fc65896af1062787a2e1283ce.1257779502.git.wuzhangjin@gmail.com> <58a7558730fbea6cd0417100c8fcd6f45668d1e3.1257779502.git.wuzhangjin@gmail.com> <3a9fc9ca02e8e6e9c3c28797a4c084c1f9d91f69.1257779502.git.wuzhangjin@gmail.com> <0cef783a71333ff96a78aaea8961e3b6b5392665.1257779502.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 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 common notrace 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