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 <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Corey Ashford <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Andi Kleen <[email protected]> Cc: David Ahern <[email protected]> Cc: Namhyung Kim <[email protected]> --- 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(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
