From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933967AbbHLRdP (ORCPT ); Wed, 12 Aug 2015 13:33:15 -0400 Received: from mail-la0-f47.google.com ([209.85.215.47]:36617 "EHLO mail-la0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932605AbbHLRdO (ORCPT ); Wed, 12 Aug 2015 13:33:14 -0400 Date: Wed, 12 Aug 2015 19:33:07 +0200 From: Rabin Vincent To: Christian Ascheberg Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: Problem with ftrace uprobes on ARM Message-ID: <20150812173307.GA19814@debian> References: <55C8E417.7080607@techfak.uni-bielefeld.de> <20150810193116.GA2895@debian> <55CB1187.6030301@techfak.uni-bielefeld.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <55CB1187.6030301@techfak.uni-bielefeld.de> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 12, 2015 at 11:27:35AM +0200, Christian Ascheberg wrote: > Is there any documentation regarding limitations of perf/ftrace support on > ARM (compared to x86)? There's Documentation/features/ which lists the status of architecture support for various kernel options. I don't know of any other documentation. > For example, I also noticed that 'perf help' lists 'trace' command, but > running 'perf trace' says 'is not a perf-command'. That doesn't have anything to do with something missing in ARM afaics. It's probably because your perf wasn't built with libaudit. Information is printed about this when you build perf. The fact that 'perf help' lists unavailable commands is probably a bug. ~/dev/linux/tools/perf$ make BUILD: Doing 'make -j8' parallel build config/Makefile:366: No libaudit.h found, disables 'trace' tool, please install audit-libs-devel or libaudit-dev