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Message-ID: <CAFrcx1kJmW_ET8FGcrQJs9P-rqyRsbi3di=5cJNT3wPmSOYiuA@mail.gmail.com>
Date: Thu, 9 Jan 2014 16:45:03 +0100
From: Jean Pihet <jean.pihet@...aro.org>
To: Jiri Olsa <jolsa@...hat.com>
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
Hi Jiri,
On 7 January 2014 13:47, Jiri Olsa <jolsa@...hat.com> 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.
That is great!
> 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.
Nice improvement!
>
> 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? ;-)
Yes sure. I will review the patches and test/benchmark them on ARMv7/v8.
Let me do that after the current tasks.
>
> thanks,
> jirka
Regards,
Jean
>
>
> 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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