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Message-ID: <20140117142823.GA3207@ghostprotocols.net>
Date: Fri, 17 Jan 2014 11:28:23 -0300
From: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To: Jiri Olsa <jolsa@...hat.com>
Cc: 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>,
David Ahern <dsahern@...il.com>,
Jan Kratochvil <jan.kratochvil@...hat.com>,
Jean Pihet <jean.pihet@...aro.org>
Subject: Re: [PATCH 00/16] perf tools: Add libdw DWARF unwind support
Em Fri, Jan 17, 2014 at 01:24:31PM +0100, Jiri Olsa escreveu:
> ping ;-)
I'll try and test this this afternoon to possibly get it in the next
pull req, after the one I'll do shortly
> 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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