From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759232AbcHYQYZ (ORCPT ); Thu, 25 Aug 2016 12:24:25 -0400 Received: from mail.kernel.org ([198.145.29.136]:34784 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759022AbcHYQYX (ORCPT ); Thu, 25 Aug 2016 12:24:23 -0400 From: Masami Hiramatsu To: Arnaldo Carvalho de Melo Cc: Masami Hiramatsu , linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar , Jiri Olsa Subject: [PATCH v2 0/3] perf probe: Introduce remote cross-arch probes Date: Fri, 26 Aug 2016 01:24:10 +0900 Message-Id: <147214224523.23638.10155676067678947950.stgit@devbox> X-Mailer: git-send-email 2.7.4 User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.)