Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933420Ab0LUJEu (ORCPT ); Tue, 21 Dec 2010 04:04:50 -0500 Received: from mail4.hitachi.co.jp ([133.145.228.5]:46771 "EHLO mail4.hitachi.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755101Ab0LUJEr (ORCPT ); Tue, 21 Dec 2010 04:04:47 -0500 X-AuditID: b753bd60-a87a8ba000003e7d-57-4d106dacf273 From: Akihiro Nagai Subject: [PATCH -tip v2 0/6] perf: Introduce bts sub commands To: Arnaldo Carvalho de Melo , Ingo Molnar , Peter Zijlstra , Frederic Weisbecker Cc: "akihiro.nagai.hw@hitachi.com"@sdl.hitachi.co.jp, Peter Zijlstra , Frederic Weisbecker , Paul Mackerras , Ingo Molnar , Arnaldo Carvalho de Melo , linux-kernel@vger.kernel.org, Masami Hiramatsu , 2nddept-manager@sdl.hitachi.co.jp Date: Tue, 21 Dec 2010 18:05:27 +0900 Message-ID: <20101221090527.8552.41486.stgit@localhost6.localdomain6> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: AAAAAA== X-FMFTCR: RANGEB Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4185 Lines: 106 Hi, This patch series provides the commands 'perf bts record' and 'perf bts trace' version 2. These commands can record and analyze BTS (Branch Trace Store) log. And, provide the interface to use BTS log for application developers. BTS is a facility of Intel x86 processors, which can record the address of 'branch to/from' on every branch/jump instruction and interrupt. This facility is very useful for developers to test their software. For example, coverage test, execution path analysis, dynamic step count ...etc. Also, those tools can have a very big advantage that they don't require any changes of the target executable binaries. But, there are few applications using BTS. Reasons I guess are ... - Few people know what BTS is. - Few people know how to use BTS on Linux box. - It's hard to analyze the BTS log because it includes just a series of addresses. So, I want to provide a user-friendly interface to BTS for application developers. About new sub commands ======================== 'perf bts record' provides the easy way to record bts log. Usage is 'perf bts record '. This command is just an alias to 'perf record -e branches:u -c 1 '. But, new one is more simple and more intuitive. 'perf bts trace' can parse and analyze recorded bts log and print various information of execution path. This command can show address, pid, command name, function+offset, file path of elf. You can choose the printed information with option. Example: 'perf bts trace' function+offset irq_return+0x0 => _start+0x0 irq_return+0x0 => _start+0x0 _start+0x3 => _dl_start+0x0 irq_return+0x0 => _dl_start+0x0 irq_return+0x0 => _dl_start+0x26 irq_return+0x0 => _dl_start+0x2d _dl_start+0x71 => _dl_start+0x93 _dl_start+0x97 => _dl_start+0x78 ... This is the default behavior of 'perf bts trace'. It prints function+offset. Example2: 'perf bts -cas trace' command address function+offset ls 0xffffffff8146fe0e irq_return+0x0 => ls 0x0000003806200b20 _start+0x0 ls 0xffffffff8146fe0e irq_return+0x0 => ls 0x0000003806200b20 _start+0x0 ls 0x0000003806200b23 _start+0x3 => ls 0x0000003806204910 _dl_start+0x0 ls 0xffffffff8146fe0e irq_return+0x0 => ls 0x0000003806204910 _dl_start+0x0 ls 0xffffffff8146fe0e irq_return+0x0 => ls 0x0000003806204936 _dl_start+0x26 ls 0xffffffff8146fe0e irq_return+0x0 => ls 0x000000380620493d _dl_start+0x2d ls 0x0000003806204981 _dl_start+0x71 => ls 0x00000038062049a3 _dl_start+0x93 ls 0x00000038062049a7 _dl_start+0x97 => ls 0x0000003806204988 _dl_start+0x78 ... In the future, I'd like to make this more informative. For example - Show source file path - Show line number - Show inlined function name - Draw call graph - Browse source code and coloring - Make bts record fast and more! Changes in V2: - Update to the latest -tip tree - add bts explanation to the subcommand list - remove the patch already merged (add OPT_CALLBACK_DEFAULT_NOOPT) - add comments - add new function to the todo list Thanks, --- Akihiro Nagai (6): perf bts trace: add print all option perf bts trace: print function+offset perf bts trace: print file path of the executed elf perf bts trace: print pid and command perf bts: Introduce new sub command 'perf bts trace' perf: Introduce perf sub command 'bts record' tools/perf/Documentation/perf-bts.txt | 53 ++++++ tools/perf/Makefile | 1 tools/perf/builtin-bts.c | 301 +++++++++++++++++++++++++++++++++ tools/perf/builtin.h | 1 tools/perf/command-list.txt | 1 tools/perf/perf.c | 1 6 files changed, 358 insertions(+), 0 deletions(-) create mode 100644 tools/perf/Documentation/perf-bts.txt create mode 100644 tools/perf/builtin-bts.c -- Akihiro Nagai (akihiro.nagai.hw@hitachi.com) -- 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/