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Date: Fri, 17 Jan 2014 13:34:25 +0100
From: Jiri Olsa <jolsa@...hat.com>
To: Jean Pihet <jean.pihet@...aro.org>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Ingo Molnar <mingo@...e.hu>,
Namhyung Kim <namhyung@...nel.org>,
Paul Mackerras <paulus@...ba.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
David Ahern <dsahern@...il.com>,
Jan Kratochvil <jan.kratochvil@...hat.com>
Subject: Re: [PATCH 00/16] perf tools: Add libdw DWARF unwind support
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 <jolsa@...hat.com> 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 <jolsa@...hat.com>
> >> Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
> >> Cc: Frederic Weisbecker <fweisbec@...il.com>
> >> Cc: Ingo Molnar <mingo@...e.hu>
> >> Cc: Namhyung Kim <namhyung@...nel.org>
> >> Cc: Paul Mackerras <paulus@...ba.org>
> >> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> >> Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> >> Cc: David Ahern <dsahern@...il.com>
> >> Cc: Jan Kratochvil <jan.kratochvil@...hat.com>
> >> Cc: Jean Pihet <jean.pihet@...aro.org>
> >> ---
> >> 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%)
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