From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755861AbcHaBBc (ORCPT ); Tue, 30 Aug 2016 21:01:32 -0400 Received: from mail.kernel.org ([198.145.29.136]:51784 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751499AbcHaBB3 (ORCPT ); Tue, 30 Aug 2016 21:01:29 -0400 Date: Wed, 31 Aug 2016 10:01:18 +0900 From: Masami Hiramatsu To: Masami Hiramatsu , Arnaldo Carvalho de Melo Cc: linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar , Jiri Olsa Subject: Re: [PATCH v2 0/3] perf probe: Introduce remote cross-arch probes Message-Id: <20160831100118.71240562ebdbcf03bbb70f61@kernel.org> In-Reply-To: <147214224523.23638.10155676067678947950.stgit@devbox> References: <147214224523.23638.10155676067678947950.stgit@devbox> X-Mailer: Sylpheed 3.5.0 (GTK+ 2.24.30; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ping? On Fri, 26 Aug 2016 01:24:10 +0900 Masami Hiramatsu wrote: > Hi, > > Here is the 2nd version of remote cross-arch probe support on perf-probe. > V1 is here: > https://lkml.org/lkml/2016/8/24/29 > > Currently perf-probe doesn't supoort cross/remote target. This means > we have to cross-build the perf-tools including libraries (elfutils, > libelf etc.), and to prepare vmlinux with debuginfo which can be > accessed from the target machine. > This requires too much resource for a small embededd device. > > If we can analyze the debuginfo by perf-probe on host machine, > we do not need to cross-build perf-tools, nor copy vmlinux on the > device. :) > > For that purpose, this series adds --definition(-D) command for > perf-probe, which shows trace event definition instead of adding > it in running kernel, according to Arnaldo's comment. > Using -D with --vmlinux(or -k)=OFFLINE-VMLINUX, perf-probe reads > the vmlinux architecture and show definition with correct > dwarf-registers. > > perf probe -k -D > > Here is an example: > ----- > $ perf probe --vmlinux=./vmlinux-arm --definition 'do_sys_open $params' > p:probe/do_sys_open do_sys_open+0 dfd=%r5:s32 filename=%r1:u32 flags=%r6:s32 mode=%r3:u16 > ----- > Here, we can get probe/do_sys_open event by "copy & paste" the > definition to target-machine's debugfs/tracing/kprobe_events. > > Note that it shows definition with direct symbol name instead of > _text+offset. It is treated as an offline module. > > Thanks, > --- > > Masami Hiramatsu (3): > perf-probe: Show trace event definition > perf-probe: Ignore vmlinux buildid if offline kernel is given > perf-probe: Support probing on offline cross-arch binary > > > tools/perf/Documentation/perf-probe.txt | 9 +++ > tools/perf/arch/arm/include/dwarf-regs-table.h | 9 +++ > tools/perf/arch/arm64/include/dwarf-regs-table.h | 13 +++++ > tools/perf/arch/powerpc/include/dwarf-regs-table.h | 27 ++++++++++ > tools/perf/arch/s390/include/dwarf-regs-table.h | 8 +++ > tools/perf/arch/sh/include/dwarf-regs-table.h | 25 +++++++++ > tools/perf/arch/sparc/include/dwarf-regs-table.h | 18 +++++++ > tools/perf/arch/x86/include/dwarf-regs-table.h | 14 +++++ > tools/perf/arch/xtensa/include/dwarf-regs-table.h | 8 +++ > tools/perf/builtin-probe.c | 34 ++++++++++-- > tools/perf/util/Build | 1 > tools/perf/util/dwarf-regs.c | 55 ++++++++++++++++++++ > tools/perf/util/include/dwarf-regs.h | 6 ++ > tools/perf/util/probe-event.c | 50 ++++++++++++++++++ > tools/perf/util/probe-event.h | 1 > tools/perf/util/probe-finder.c | 27 ++++++---- > tools/perf/util/probe-finder.h | 1 > tools/perf/util/symbol-elf.c | 2 - > 18 files changed, 289 insertions(+), 19 deletions(-) > create mode 100644 tools/perf/arch/arm/include/dwarf-regs-table.h > create mode 100644 tools/perf/arch/arm64/include/dwarf-regs-table.h > create mode 100644 tools/perf/arch/powerpc/include/dwarf-regs-table.h > create mode 100644 tools/perf/arch/s390/include/dwarf-regs-table.h > create mode 100644 tools/perf/arch/sh/include/dwarf-regs-table.h > create mode 100644 tools/perf/arch/sparc/include/dwarf-regs-table.h > create mode 100644 tools/perf/arch/x86/include/dwarf-regs-table.h > create mode 100644 tools/perf/arch/xtensa/include/dwarf-regs-table.h > create mode 100644 tools/perf/util/dwarf-regs.c > > -- > Masami Hiramatsu (Linaro Ltd.) -- Masami Hiramatsu