From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759094AbZFRCV2 (ORCPT ); Wed, 17 Jun 2009 22:21:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758631AbZFRCVI (ORCPT ); Wed, 17 Jun 2009 22:21:08 -0400 Received: from mail-ew0-f210.google.com ([209.85.219.210]:34041 "EHLO mail-ew0-f210.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758643AbZFRCVG (ORCPT ); Wed, 17 Jun 2009 22:21:06 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=SSouHhRJOGPzn9JTtoW9fFedIScGbAkNI5/JXNeklOfrLgwRz/ljGcXZaCQgflWjq0 io/AvQkj0i0M9fFl5hobY37IYjlX3gsICDPXVrwxLels0icsP6PvlhyXP8v+3KhIBTeh ibxIGzY06J8IQIIbJII12RU98yHgzXTretEn8= Date: Thu, 18 Jun 2009 04:21:05 +0200 From: Frederic Weisbecker To: Ingo Molnar Cc: Jason Baron , linux-kernel@vger.kernel.org, laijs@cn.fujitsu.com, rostedt@goodmis.org, peterz@infradead.org, mathieu.desnoyers@polymtl.ca, jiayingz@google.com, bligh@google.com, roland@redhat.com, fche@redhat.com Subject: Re: [PATCH 0/7] add syscall tracepoints Message-ID: <20090618022102.GA8095@nowhere> References: <20090616193220.GB12699@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090616193220.GB12699@elte.hu> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 16, 2009 at 09:32:20PM +0200, Ingo Molnar wrote: > > * Jason Baron wrote: > > > hi, > > > > The following is an implementation of Frederic's syscall tracer on > > top of tracepoints. It adds the ability to toggle the entry/exit > > of each syscall via the standard > > events/syscalls/syscall_blah/enable interface. The implementation > > is done by adding 2 tracepoints. One on entry and one for exit. > > > > This implementation required a few 'core' api changes. I've added > > 'DECLARE_TRACE_REG()' macro which takes a register and and an > > unregister function as arguments. This allowed me to toggle the > > ftrace tif flag when the first tracepoint callback is added and > > the last is removed. Current callers of 'DECLARE_TRACE()' are not > > impacted. > > > > Another change was to call arch_init_ftrace_syscalls via an > > 'arch_initall'. In this implmentation I needed to access the > > syscalls_metadata structure at runtime in order to determine which > > syscalls were 'traceable'. Although the implementation uses > > SYSCALL_DEFINE() to set up the the trace events, for some reason > > at runtime there is no syscalls_metadata, associated with some of > > the SYSCALL_DEFINE() calls. I'm not quite sure why that is. > > However, by calling arch_init_ftrace_syscalls() at boot I can make > > sure the lists are in sync. > > > > thanks, > > > > -Jason > > > > > > arch/x86/include/asm/ftrace.h | 4 +- > > arch/x86/kernel/ftrace.c | 24 +++++- > > arch/x86/kernel/ptrace.c | 6 +- > > include/linux/syscalls.h | 63 +++++++++++++++ > > include/linux/tracepoint.h | 27 ++++++- > > include/trace/syscall.h | 37 +++++++--- > > kernel/trace/trace_events.c | 29 +++++--- > > kernel/trace/trace_syscalls.c | 172 +++++++++++++++++++---------------------- > > kernel/tracepoint.c | 38 +++++++++ > > 9 files changed, 278 insertions(+), 122 deletions(-) > > This looks far nicer structurally. Steve, Frederic, what's your take > on this series? > > Ingo Sorry, I hadn't a lot of time recently to review it but I'll have some time to do it soon. Thanks.