On Tue, Mar 04, 2014 at 02:24:37AM +0100, Jean Pihet wrote: > Hi, > > Here are some notes about the performance improvement and the test usage. > > Jiri, do you need these notes in the one of commit description? > > 1. Using libdw vs libunwind on ARMv7 > > The performance gain is (more than) significant: >800%.
I dont mind.. but 800% would look just great in changelog ;-) jirka > > I did not profile perf itself ;-p just did a timing measurement. > The benchmark has been run multiple times with different perf.data > sizes. The results are consistent across the tests runs. > > Usage: > ./tools/perf/perf record --call-graph dwarf -- > ../../libunwind/test_app/stress_bt > time ./tools/perf/perf report --stdio > /dev/null 2>&1 > > Platform: > Quad-core marvell XP370. perf runs on 1 cpu > > Perf data size: > 304MB libunwind libdw improvement > real 9m31.577s 1m13.052s 782% > user 5m33.020s 1m2.910s 529% > sys 3m57.770s 0m10.090s 2356% > > 2. unwind test usage > perf test list gives the list of supported tests. In this case the > test #23 is dwarf unwinding: > > ./tools/perf/perf test 23 > 23: Test dwarf unwind : Ok > > > Regards, > Jean > > > On 3 March 2014 10:53, Jean Pihet <jean.pi...@linaro.org> wrote: > > Adding libdw DWARF post unwind support, which is part > > of elfutils-devel/libdw-dev package from version 0.158. > > > > Also includes the test suite for dwarf unwinding, by adding the > > arch specific test code and the perf_regs_load function. > > > > Jean Pihet (3): > > perf tests: Introduce perf_regs_load function on ARM > > perf tests: Add dwarf unwind test on ARM > > perf tools: Add libdw DWARF post unwind support for ARM > > > > tools/perf/Makefile.perf | 2 +- > > tools/perf/arch/arm/Makefile | 7 ++++ > > tools/perf/arch/arm/include/perf_regs.h | 5 +++ > > tools/perf/arch/arm/tests/dwarf-unwind.c | 59 > > ++++++++++++++++++++++++++++++++ > > tools/perf/arch/arm/tests/regs_load.S | 51 +++++++++++++++++++++++++++ > > tools/perf/arch/arm/util/unwind-libdw.c | 36 +++++++++++++++++++ > > tools/perf/tests/builtin-test.c | 2 +- > > tools/perf/tests/tests.h | 2 +- > > 8 files changed, 161 insertions(+), 3 deletions(-) > > create mode 100644 tools/perf/arch/arm/tests/dwarf-unwind.c > > create mode 100644 tools/perf/arch/arm/tests/regs_load.S > > create mode 100644 tools/perf/arch/arm/util/unwind-libdw.c > > > > --- > > > > - Rebased on latest acme/perf/core git tree, > > - Tested on quad-core ARMv7 machine > > > > -- > > 1.7.11.7 > > -- 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/
