Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752655AbaAQMeu (ORCPT ); Fri, 17 Jan 2014 07:34:50 -0500 Received: from mx1.redhat.com ([209.132.183.28]:47749 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752297AbaAQMer (ORCPT ); Fri, 17 Jan 2014 07:34:47 -0500 Date: Fri, 17 Jan 2014 13:34:25 +0100 From: Jiri Olsa To: Jean Pihet Cc: "linux-kernel@vger.kernel.org" , Corey Ashford , Frederic Weisbecker , Ingo Molnar , Namhyung Kim , Paul Mackerras , Peter Zijlstra , Arnaldo Carvalho de Melo , David Ahern , Jan Kratochvil Subject: Re: [PATCH 00/16] perf tools: Add libdw DWARF unwind support Message-ID: <20140117123425.GE1130@krava.brq.redhat.com> References: <1389098853-14466-1-git-send-email-jolsa@redhat.com> <20140117122431.GC1130@krava.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jan 17, 2014 at 01:27:53PM +0100, Jean Pihet wrote: > Hi Jiri, > > Let me start on it next week. Is that OK? great ;-) thanks jirka > > Thx for the reminder, I had not entirely forgotten it though ;p > > Regards, > Jean > > On 17 January 2014 13:24, Jiri Olsa wrote: > > ping ;-) > > > > thanks, > > jirka > > > > On Tue, Jan 07, 2014 at 01:47:17PM +0100, Jiri Olsa wrote: > >> hi, > >> adding libdw DWARF unwind support, which is part of just released > >> elfutils package 0.158. > >> > >> We can now compile perf to have either libunwind DWARF unwind, > >> (which is still default) or the new one libdw unwind. > >> > >> Examples: > >> - compile in libdw unwinder if present: > >> $ make NO_LIBUNWIND=1 > >> > >> - compile in libdw (with libdw installation directory) unwinder if present: > >> $ make LIBDW_DIR=/opt/elfutils/ NO_LIBUNWIND=1 > >> > >> - disable post dwarf unwind completely: > >> $ make NO_LIBUNWIND=1 NO_LIBDW_DWARF_UNWIND=1 > >> > >> Performance wise the libdw unwinder seems to be faster. > >> Following results are from 2GB perf.data file with 249156 > >> samples: > >> > >> The libdw unwind perf: > >> $ time perf report -i ~/perf.data > perf.data.ldw > >> > >> real 0m35.746s > >> user 0m24.211s > >> sys 0m11.214s > >> > >> The libunwind unwind perf: > >> $ time perf report -i ~/perf.data > perf.data.unw > >> > >> real 1m41.149s > >> user 1m9.694s > >> sys 0m30.595s > >> > >> In example above I've got 2206 differences (perf.data.ldw and > >> perf.data.unw files) in the callchains output out of the 249156 > >> samples which is below 1%. Together with some other tips for speed > >> increase it's on my TODO list for future. > >> > >> Git tree: > >> https://git.kernel.org/cgit/linux/kernel/git/jolsa/perf.git/ > >> perf/core_libdw_unwind > >> > >> Kudos to Jan Kratochvil for helping me with the new interface. > >> > >> Jean, > >> I haven't tested on arm.. so not sure I broke anything there. > >> Any chance you could test for me, and maybe make the automated > >> test I added work there? ;-) > >> > >> thanks, > >> jirka > >> > >> > >> Signed-off-by: Jiri Olsa > >> Cc: Corey Ashford > >> Cc: Frederic Weisbecker > >> Cc: Ingo Molnar > >> Cc: Namhyung Kim > >> Cc: Paul Mackerras > >> Cc: Peter Zijlstra > >> Cc: Arnaldo Carvalho de Melo > >> Cc: David Ahern > >> Cc: Jan Kratochvil > >> Cc: Jean Pihet > >> --- > >> Jiri Olsa (16): > >> perf tools: Automate setup of FEATURE_CHECK_(C|LD)FLAGS-all variables > >> perf tools: Fix machine initialization > >> perf tools: Make perf_event__synthesize_mmap_events global > >> perf tests x86: Introduce perf_regs_load function > >> perf tests x86: Add dwarf unwind test > >> perf tools: Fix dwarf unwind max_stack processing > >> perf tools: Do not report zero address in unwind > >> perf tools: Add mask into struct regs_dump > >> perf tools: Separate libunwind code to special object > >> perf tools: Rename unwind__arch_reg_id into libunwind__arch_reg_id > >> perf tools: Introduce HAVE_DWARF_UNWIND_SUPPORT macro > >> perf tools: Separate perf_reg_value function in perf_regs object > >> perf tools: Add feature check for libdw dwarf unwind > >> perf tools: Add libdw DWARF post unwind support > >> perf tools: Setup default dwarf post unwinder > >> perf tests: Add NO_LIBDW_DWARF_UNWIND make test > >> > >> tools/perf/Makefile.perf | 19 ++++++- > >> tools/perf/arch/arm/Makefile | 2 +- > >> tools/perf/arch/arm/util/{unwind.c => unwind-libunwind.c} | 2 +- > >> tools/perf/arch/x86/Makefile | 9 +++- > >> tools/perf/arch/x86/include/perf_regs.h | 6 +++ > >> tools/perf/arch/x86/tests/dwarf-unwind.c | 59 ++++++++++++++++++++ > >> tools/perf/arch/x86/tests/regs_load.S | 92 ++++++++++++++++++++++++++++++++ > >> tools/perf/arch/x86/util/unwind-libdw.c | 51 ++++++++++++++++++ > >> tools/perf/arch/x86/util/{unwind.c => unwind-libunwind.c} | 4 +- > >> tools/perf/builtin-inject.c | 1 - > >> tools/perf/builtin-record.c | 10 ++-- > >> tools/perf/config/Makefile | 94 +++++++++++++++++++++++--------- > >> tools/perf/config/feature-checks/Makefile | 6 ++- > >> tools/perf/config/feature-checks/test-all.c | 5 ++ > >> tools/perf/config/feature-checks/test-libdw-dwarf-unwind.c | 13 +++++ > >> tools/perf/tests/builtin-test.c | 8 +++ > >> tools/perf/tests/dwarf-unwind.c | 144 +++++++++++++++++++++++++++++++++++++++++++++++++ > >> tools/perf/tests/make | 63 +++++++++++----------- > >> tools/perf/tests/sample-parsing.c | 17 +++--- > >> tools/perf/tests/tests.h | 9 ++++ > >> tools/perf/util/event.c | 12 ++--- > >> tools/perf/util/event.h | 12 ++++- > >> tools/perf/util/evsel.c | 13 ++--- > >> tools/perf/util/machine.c | 4 +- > >> tools/perf/util/perf_regs.c | 19 +++++++ > >> tools/perf/util/perf_regs.h | 13 +++++ > >> tools/perf/util/session.c | 5 +- > >> tools/perf/util/unwind-libdw.c | 210 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > >> tools/perf/util/unwind-libdw.h | 21 ++++++++ > >> tools/perf/util/{unwind.c => unwind-libunwind.c} | 50 ++++++----------- > >> tools/perf/util/unwind.h | 11 ++-- > >> 31 files changed, 849 insertions(+), 135 deletions(-) > >> rename tools/perf/arch/arm/util/{unwind.c => unwind-libunwind.c} (95%) > >> create mode 100644 tools/perf/arch/x86/tests/dwarf-unwind.c > >> create mode 100644 tools/perf/arch/x86/tests/regs_load.S > >> create mode 100644 tools/perf/arch/x86/util/unwind-libdw.c > >> rename tools/perf/arch/x86/util/{unwind.c => unwind-libunwind.c} (95%) > >> create mode 100644 tools/perf/config/feature-checks/test-libdw-dwarf-unwind.c > >> create mode 100644 tools/perf/tests/dwarf-unwind.c > >> create mode 100644 tools/perf/util/perf_regs.c > >> create mode 100644 tools/perf/util/unwind-libdw.c > >> create mode 100644 tools/perf/util/unwind-libdw.h > >> rename tools/perf/util/{unwind.c => unwind-libunwind.c} (92%) -- 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/