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SubjectRe: [GIT PULL 00/14] perf/core improvements and fixes
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Hi Jiri,


On 12 June 2014 17:30, Jiri Olsa <jolsa@kernel.org> wrote:
> hi Ingo,
> please consider pulling
>
> thanks,
> jirka
>
> The following changes since commit 7184062b94b4bfac08715fb786fd2df399c5d6ee:
>
> Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core (2014-06-12 13:54:42 +0200)
>
> are available in the git repository at:
>
>
> git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git tags/perf-core-for-mingo
>
> for you to fetch changes up to 45dc1bb5c1d47f9519e2101f6b073bb4bb1d1f99:
>
> perf tests: Add test for closing dso objects on EMFILE error (2014-06-12 16:53:23 +0200)
>
> ----------------------------------------------------------------
> perf/core improvements and fixes:
>
> . Honor user freq/interval properly in record command (Namhyung Kim)
>
> . Speedup DWARF unwind (Jiri Olsa)
Here are the results of the performance assessment on ARMv7, FWIW:

The results for unwind_speedup (v4) on ARMv7 are:
- libunwind: between -17% in execution time for light load (i.e. using
not-so-deep backtraces from the stress app.) and -25% for deep
backtrace (the stress_bt app.),
- libdw: no significant improvement (0-3% improvement).

The results for unwind_speedup (v3) on ARMv7 are:
- libunwind: between -29% in execution time for light load (i.e. using
not-so-deep backtraces from the stress app.) and -49% for deep
backtrace (the stress_bt app.),
- libdw: no significant improvement (0-2% improvement).

Note: v3 is faster than v4 by 13-25%, with and without the speed-up
patches. The real cause has been investigated, yet.

Cf. https://wiki.linaro.org/LEG/Engineering/TOOLS/perf-callstack-unwinding#Speed_improvement
for the details.

Regards,
Jean

>
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
>
> ----------------------------------------------------------------
> Jiri Olsa (13):
> perf tools: Cache register accesses for unwind processing
> perf tools: Separate dso data related variables
> perf tools: Add data_fd into dso object
> perf tools: Add global list of opened dso objects
> perf tools: Add global count of opened dso objects
> perf tools: Cache dso data file descriptor
> perf tools: Add file size check and factor dso__data_read_offset
> perf tools: Allow to close dso fd in case of open failure
> perf tools: Add dso__data_* interface descriptons
> perf tests: Spawn child for each test
> perf tests: Allow reuse of test_file function
> perf tests: Add test for caching dso file descriptors
> perf tests: Add test for closing dso objects on EMFILE error
>
> Namhyung Kim (1):
> perf record: Fix to honor user freq/interval properly
>
> tools/perf/tests/builtin-test.c | 42 +++++-
> tools/perf/tests/dso-data.c | 214 +++++++++++++++++++++++++++-
> tools/perf/tests/tests.h | 2 +
> tools/perf/util/dso.c | 279 +++++++++++++++++++++++++++++++++----
> tools/perf/util/dso.h | 50 ++++++-
> tools/perf/util/event.h | 5 +
> tools/perf/util/evsel.c | 4 +-
> tools/perf/util/perf_regs.c | 10 +-
> tools/perf/util/perf_regs.h | 4 +-
> tools/perf/util/unwind-libunwind.c | 2 -
> 10 files changed, 574 insertions(+), 38 deletions(-)


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