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Arnaldo Carvalho de Melo bfaef4b46b perf diff: Use hists__link when not pairing just with baseline 
Previously there were blind spots because we were not looking at symbols
that didn't ocurred in the latest run:

  # perf record usleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.018 MB perf.data (~801 samples) ]
  # perf record usleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.018 MB perf.data (~801 samples) ]

Before:

  # perf diff
  # Event 'cycles'
  #
  # Baseline    Delta      Shared Object                         Symbol
  # ........  .......  .................  .............................
  #
              +10.38%  [kernel.kallsyms]  [k] get_empty_filp
               +9.51%  [kernel.kallsyms]  [k] update_sd_lb_stats
               +9.41%  libpopt.so.0.0.0   [.] _init
               +9.29%  [kernel.kallsyms]  [k] vma_interval_tree_insert
       9.05%   +0.12%  [kernel.kallsyms]  [k] do_sys_open
               +9.14%  [kernel.kallsyms]  [k] kfree
               +8.98%  [kernel.kallsyms]  [k] free_pages_and_swap_cache
               +8.78%  [kernel.kallsyms]  [k] unmap_page_range
       9.36%   -0.90%  [kernel.kallsyms]  [k] zap_pte_range
       7.60%   +0.09%  [kernel.kallsyms]  [k] find_next_bit
               +4.37%  [kernel.kallsyms]  [k] place_entity
               +3.38%  [kernel.kallsyms]  [k] __do_page_fault
               +0.80%  [kernel.kallsyms]  [k] native_apic_mem_write
       0.21%   +0.43%  [kernel.kallsyms]  [k] native_write_msr_safe
  #

So 9.05 + 9.36 + 7.60 + 0.21 != 100%

Now using the recently introduced hists__link we can see the whole
picture:

  # perf diff
  # Event 'cycles'
  #
  # Baseline    Delta      Shared Object                         Symbol
  # ........  .......  .................  .............................
  #
       8.44%   -8.44%  [kernel.kallsyms]  [k] _raw_spin_lock
       9.05%   -9.05%  [kernel.kallsyms]  [k] sha_transform
      10.55%  -10.55%  [kernel.kallsyms]  [k] __d_lookup_rcu
              +10.38%  [kernel.kallsyms]  [k] get_empty_filp
      17.70%  -17.70%  [kernel.kallsyms]  [k] kmem_cache_free
               +9.51%  [kernel.kallsyms]  [k] update_sd_lb_stats
               +9.41%  libpopt.so.0.0.0   [.] _init
               +9.29%  [kernel.kallsyms]  [k] vma_interval_tree_insert
       9.05%   +0.12%  [kernel.kallsyms]  [k] do_sys_open
               +9.14%  [kernel.kallsyms]  [k] kfree
               +8.98%  [kernel.kallsyms]  [k] free_pages_and_swap_cache
               +8.78%  [kernel.kallsyms]  [k] unmap_page_range
       9.36%   -0.90%  [kernel.kallsyms]  [k] zap_pte_range
       7.60%   +0.09%  [kernel.kallsyms]  [k] find_next_bit
               +4.37%  [kernel.kallsyms]  [k] place_entity
               +3.38%  [kernel.kallsyms]  [k] __do_page_fault
       4.01%   -4.01%  [kernel.kallsyms]  [k] handle_pte_fault
       9.27%   -9.27%  [kernel.kallsyms]  [k] find_get_page
       0.78%   -0.78%  [kernel.kallsyms]  [k] rcu_irq_enter
       0.57%   -0.57%  [kernel.kallsyms]  [k] finish_task_switch
       4.25%   -4.25%  [kernel.kallsyms]  [k] run_timer_softirq
               +0.80%  [kernel.kallsyms]  [k] native_apic_mem_write
       0.21%   +0.43%  [kernel.kallsyms]  [k] native_write_msr_safe
       9.16%   -9.16%  ld-2.12.so         [.] close
  #

Now:

8.44 + 9.05 + 10.55 + 17.70 + 9.05 + 9.36 +
7.60 + 4.01 + 9.27 + 0.78 + 0.57 + 4.25 + 0.21 + 9.16 == 100%

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-jeq55qdgby1745bs8r9sscdh@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2012-11-08 18:08:26 -03:00
..
arch perf tools: Don't try to lookup objdump for live mode 2012-11-08 17:26:52 -03:00
bench perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
config perf tools: Always show CHK message when doing try-cc 2012-10-26 11:22:24 -02:00
Documentation perf tools: Add info about cross compiling for Android ARM 2012-10-31 12:17:49 -02:00
python perf python: Use attr.watermark in twatch.py 2012-01-30 18:38:23 -02:00
scripts perf scripts: Add event_analyzing_sample-record/report 2012-09-17 13:11:15 -03:00
tests perf tests: Move attr.py temp dir cleanup into finally section 2012-11-08 13:16:19 -03:00
ui perf diff: Start moving to support matching more than two hists 2012-11-08 17:43:09 -03:00
util perf hists: Introduce hists__link 2012-11-08 18:08:15 -03:00
.gitignore perf tools: Ignore compiled python binaries 2012-09-07 12:10:58 -03:00
bash_completion perf tools: Complete tracepoint event names 2012-10-04 12:44:52 -03:00
builtin-annotate.c perf tools: Introduce struct hist_browser_timer 2012-11-05 14:03:58 -03:00
builtin-bench.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
builtin-buildid-cache.c perf tools: Move BUILD_ID_SIZE into build-id object 2012-10-29 11:35:32 -02:00
builtin-buildid-list.c perf tools: Add a global variable "const char *input_name" 2012-10-29 11:45:34 -02:00
builtin-diff.c perf diff: Use hists__link when not pairing just with baseline 2012-11-08 18:08:26 -03:00
builtin-evlist.c perf tools: Add a global variable "const char *input_name" 2012-10-29 11:45:34 -02:00
builtin-help.c perf help: Fix --help for builtins 2012-10-22 12:35:49 -02:00
builtin-inject.c perf inject: Mark a dso if it's used 2012-10-26 11:22:25 -02:00
builtin-kmem.c perf tools: Add a global variable "const char *input_name" 2012-10-29 11:45:34 -02:00
builtin-kvm.c perf kvm: Add braces around multi-line statements 2012-10-08 17:15:54 -03:00
builtin-list.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
builtin-lock.c perf tools: Add a global variable "const char *input_name" 2012-10-29 11:45:34 -02:00
builtin-probe.c perf probe: Don't use globals where not needed to 2012-10-02 18:36:37 -03:00
builtin-record.c perf record: Fix mmap error output condition 2012-10-29 12:14:59 -02:00
builtin-report.c perf report: Postpone objdump check until annotation requested 2012-11-05 14:03:58 -03:00
builtin-sched.c perf tools: Add a global variable "const char *input_name" 2012-10-29 11:45:34 -02:00
builtin-script.c perf script: Add more filter to find_scripts() 2012-10-29 11:46:23 -02:00
builtin-stat.c perf stat: Add --pre and --post command 2012-10-26 11:22:25 -02:00
builtin-timechart.c perf tools: Add a global variable "const char *input_name" 2012-10-29 11:45:34 -02:00
builtin-top.c perf report: Postpone objdump check until annotation requested 2012-11-05 14:03:58 -03:00
builtin-trace.c perf trace: Use sched:sched_stat_runtime to provide a thread summary 2012-10-25 10:57:43 -02:00
builtin.h perf trace: New tool 2012-09-26 20:42:23 -03:00
command-list.txt perf trace: New tool 2012-09-26 20:42:23 -03:00
CREDITS perf_counter tools: Add CREDITS file for Git contributors 2009-06-24 19:54:29 +02:00
design.txt perf tools: Update ioctl documentation for PERF_IOC_FLAG_GROUP 2012-05-31 11:38:42 -03:00
Makefile perf tools: Add LIBDW_DIR Makefile variable to for alternate libdw 2012-11-08 16:01:37 -03:00
MANIFEST perf kvm: Events analysis tool 2012-09-21 12:51:22 -03:00
perf-archive.sh perf archive: Make 'f' the last parameter for tar 2012-09-17 13:10:42 -03:00
perf.c perf tests: Add framework for automated perf_event_attr tests 2012-10-31 16:20:58 -02:00
perf.h perf tests: Add attr tests under builtin test command 2012-11-01 17:00:40 -03:00