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 <jo...@redhat.com> > > Cc: Corey Ashford <cjash...@linux.vnet.ibm.com> > > Cc: Frederic Weisbecker <fweis...@gmail.com> > > Cc: Ingo Molnar <mi...@elte.hu> > > Cc: Namhyung Kim <namhy...@kernel.org> > > Cc: Paul Mackerras <pau...@samba.org> > > Cc: Peter Zijlstra <a.p.zijls...@chello.nl> > > Cc: Arnaldo Carvalho de Melo <a...@ghostprotocols.net> > > Cc: David Ahern <dsah...@gmail.com> > > Cc: Jan Kratochvil <jan.kratoch...@redhat.com> > > Cc: Jean Pihet <jean.pi...@linaro.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%) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/