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    SubjectRe: [RFC 00/12] perf diff: Factor diff command
    forgot to mention git repo:

    git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/linux.git
    perf/diff8 branch

    jirka


    On Thu, Sep 06, 2012 at 05:46:54PM +0200, Jiri Olsa wrote:
    > hi,
    > this patchset factors the perf diff command to be usable for
    > differential profiling following paper from Paul McKenney:
    > (thanks to Arnaldo for sharing it with me).
    >
    > http://www2.rdrop.com/users/paulmck/scalability/paper/profiling.2002.06.04.pdf
    >
    > The 'perf diff' and 'std/hist' code is now changed to allow computations
    > mentioned in the paper. Two of them are implemented within this patchset:
    > 1) ratio differential profiling
    > 2) weighted differential profiling
    >
    > The standard ratio delta computation stays as default.
    >
    > To sum it up:
    > - perf diff displays output for matching event pairs within 2 given perf.data files
    > - stdio ui code is factored to allow easy insertion of new data column
    > - added perf diff '-b' option to display only matched hist entries
    > (hist entries found in both files)
    > - added perf diff '-c' option to choose diff computation,
    > support for:
    > delta: the current default one
    > ratio: ratio differential profile
    > wdiff: weighted differential profile
    > - added perf diff '-c+' option to sort entries based on the computation data
    > - added perf diff '-F' option to show formula used to compute the data
    > - added perf diff '-p' option to display hist entries periods
    >
    >
    > Attached patches:
    > 01/12 perf diff: Make diff command work with evsel hists
    > 02/12 perf tools: Replace sort's standalone field_sep with symbol_conf.field_sep
    > 03/12 perf hists: Add struct hists pointer to struct hist_entry
    > 04/12 perf diff: Refactor diff displacement possition info
    > 05/12 perf diff: Refactor stdio ui data columns output
    > 06/12 perf diff: Add -b option for perf diff to display paired entries only
    > 07/12 perf diff: Add ratio computation way to compare hist entries
    > 08/12 perf diff: Add option to sort entries based on diff computation
    > 09/12 perf diff: Add weighted diff computation way to compare hist entries
    > 10/12 perf diff: Add -p option to display period values for hist entries
    > 11/12 perf diff: Add -F option to display formula for computation
    > 12/12 perf diff: Add -F option for ratio computation
    >
    >
    > I'm still testing this, trying to find out useful outputs/computations/options,
    > so looking for any ideas and recommendations ;)
    >
    > thanks,
    > jirka
    >
    >
    > Eamples:
    >
    > display default profile
    > -----------------------------------------------------------------------------------
    > $ ./perf diff
    > # Event 'cache-misses:u'
    > #
    > # Baseline Delta Shared Object Symbol
    > # ........ ........ .................. .................................
    > #
    > 0.00% +63.54% libc-2.15.so [.] __dcigettext
    > 0.00% +5.38% libc-2.15.so [.] _dl_addr
    > 0.00% +5.30% libc-2.15.so [.] __register_atfork
    > 0.31% +3.94% [kernel.kallsyms] [k] page_fault
    > 0.00% +4.07% ld-2.15.so [.] check_match.11335
    > 0.00% +3.65% ld-2.15.so [.] version_check_doit
    > 0.00% +3.56% ld-2.15.so [.] _dl_fixup
    > 0.00% +3.05% ld-2.15.so [.] _dl_map_object
    > 0.00% +2.90% [kernel.kallsyms] [k] system_call
    > 3.94% -1.53% [kernel.kallsyms] [k] device_not_available
    > 0.00% +1.21% libc-2.15.so [.] __GI___libc_write
    > 0.00% +0.54% libc-2.15.so [.] __memcpy_ssse3_back
    > 0.00% +0.11% libc-2.15.so [.] execvp
    > 7.71% -7.69% ld-2.15.so [.] _dl_start
    > 0.03% -0.02% libpthread-2.15.so [.] __read_nocancel
    > 0.20% -0.18% perf [.] perf_evlist__prepare_workload
    >
    >
    >
    > display ratio profile
    > -----------------------------------------------------------------------------------
    > $ ./perf diff -cratio
    > # Event 'cache-misses:u'
    > #
    > # Baseline Ratio Shared Object Symbol
    > # ........ .............. .................. .................................
    > #
    > 0.00% 0.000 libc-2.15.so [.] __dcigettext
    > 0.00% 0.000 libc-2.15.so [.] _dl_addr
    > 0.00% 0.000 libc-2.15.so [.] __register_atfork
    > 0.31% 15.450 [kernel.kallsyms] [k] page_fault
    > 0.00% 0.000 ld-2.15.so [.] check_match.11335
    > 0.00% 0.000 ld-2.15.so [.] version_check_doit
    > 0.00% 0.000 ld-2.15.so [.] _dl_fixup
    > 0.00% 0.000 ld-2.15.so [.] _dl_map_object
    > 0.00% 0.000 [kernel.kallsyms] [k] system_call
    > 3.94% 0.678 [kernel.kallsyms] [k] device_not_available
    > 0.00% 0.000 libc-2.15.so [.] __GI___libc_write
    > 0.00% 0.000 libc-2.15.so [.] __memcpy_ssse3_back
    > 0.00% 0.000 libc-2.15.so [.] execvp
    > 7.71% 0.002 ld-2.15.so [.] _dl_start
    > 0.03% 0.500 libpthread-2.15.so [.] __read_nocancel
    > 0.20% 0.077 perf [.] perf_evlist__prepare_workload
    >
    >
    >
    > display ratio profile only with entries matched in both files
    > -----------------------------------------------------------------------------------
    > $ ./perf diff -cratio -b
    >
    > # Event 'cache-misses:u'
    > #
    > # Baseline Ratio Shared Object Symbol
    > # ........ .............. .................. .................................
    > #
    > 0.31% 15.450 [kernel.kallsyms] [k] page_fault
    > 3.94% 0.678 [kernel.kallsyms] [k] device_not_available
    > 7.71% 0.002 ld-2.15.so [.] _dl_start
    > 0.03% 0.500 libpthread-2.15.so [.] __read_nocancel
    > 0.20% 0.077 perf [.] perf_evlist__prepare_workload
    >
    >
    >
    > display ratio profile only with entries matched in both files and sorted
    > -----------------------------------------------------------------------------------
    > $ ./perf diff -c+ratio -b
    >
    > # Event 'cache-misses:u'
    > #
    > # Baseline Ratio Shared Object Symbol
    > # ........ .............. .................. .................................
    > #
    > 0.31% 15.450 [kernel.kallsyms] [k] page_fault
    > 3.94% 0.678 [kernel.kallsyms] [k] device_not_available
    > 0.03% 0.500 libpthread-2.15.so [.] __read_nocancel
    > 0.20% 0.077 perf [.] perf_evlist__prepare_workload
    > 7.71% 0.002 ld-2.15.so [.] _dl_start
    >
    >
    >
    > display weighted profile with weights w1=1 w2=2, with formula, sorted, matching
    > entries only and with periods displayed
    > -----------------------------------------------------------------------------------
    > $ ./perf diff -c+wdiff:1,2 -F -b -p
    >
    > # Baseline Weighted diff Formula Baseline Period Period Shared Object Symbol
    > # ........ ............. .................................................. ............... ............ .................. .................................
    > #
    > 0.31% +598 (309 * 2) - (20 * 1) 20 309 [kernel.kallsyms] [k] page_fault
    > 3.94% +92 (175 * 2) - (258 * 1) 258 175 [kernel.kallsyms] [k] device_not_available
    > 0.03% +0 (1 * 2) - (2 * 1) 2 1 libpthread-2.15.so [.] __read_nocancel
    > 0.20% -11 (1 * 2) - (13 * 1) 13 1 perf [.] perf_evlist__prepare_workload
    > 7.71% -503 (1 * 2) - (505 * 1) 505 1 ld-2.15.so [.] _dl_start
    >
    >
    > Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
    > Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    > Cc: Ingo Molnar <mingo@elte.hu>
    > Cc: Paul Mackerras <paulus@samba.org>
    > Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
    > Cc: Frederic Weisbecker <fweisbec@gmail.com>
    > Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    > Cc: Andi Kleen <andi@firstfloor.org>
    > Cc: David Ahern <dsahern@gmail.com>
    > Cc: Namhyung Kim <namhyung@kernel.org>
    >
    > ---
    > tools/perf/Documentation/perf-diff.txt | 63 ++++++++++
    > tools/perf/builtin-diff.c | 488 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------
    > tools/perf/builtin-report.c | 6 +-
    > tools/perf/builtin-top.c | 6 +-
    > tools/perf/ui/stdio/hist.c | 574 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-----------------------------------
    > tools/perf/ui/stdio/hist.h | 26 ++++
    > tools/perf/util/evsel.h | 7 ++
    > tools/perf/util/hist.c | 7 +-
    > tools/perf/util/hist.h | 24 +++-
    > tools/perf/util/session.h | 4 +-
    > tools/perf/util/sort.c | 6 +-
    > tools/perf/util/sort.h | 22 +++-
    > 12 files changed, 957 insertions(+), 276 deletions(-)


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