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perf script: Add branch counters

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It's useful to print the branch counter information for each jump in
the brstackinsn when it's available.

Add a new field 'brcntr' to display the branch counter information.

By default, the abbreviation will be used to indicate the branch
counter. In the verbose mode, the real event name is shown.

  $ perf script -F +brstackinsn,+brcntr

  # Branch counter abbr list:
  # branch-instructions:ppp = A
  # branch-misses = B
  # '-' No event occurs
  # '+' Event occurrences may be lost due to branch counter saturated
      tchain_edit  332203 3366329.405674:      53030 branch-instructions:ppp:            401781 f3+0x2c (home/sdp/test/tchain_edit)
         f3+31:
         0000000000401774        insn: eb 04                     br_cntr: AA     # PRED 5 cycles [5]
         000000000040177a        insn: 81 7d fc 0f 27 00 00
         0000000000401781        insn: 7e e3                     br_cntr: A      # PRED 1 cycles [6] 2.00 IPC
         0000000000401766        insn: 8b 45 fc
         0000000000401769        insn: 83 e0 01
         000000000040176c        insn: 85 c0
         000000000040176e        insn: 74 06                     br_cntr: A      # PRED 1 cycles [7] 4.00 IPC
         0000000000401776        insn: 83 45 fc 01
         000000000040177a        insn: 81 7d fc 0f 27 00 00
         0000000000401781        insn: 7e e3                     br_cntr: A      # PRED 7 cycles [14] 0.43 IPC

  $ perf script -F +brstackinsn,+brcntr -v

     tchain_edit  332203 3366329.405674:      53030 branch-instructions:ppp:            401781 f3+0x2c (/home/sdp/os.linux.perf.test-suite/kernels/lbr_kernel/tchain_edit)
        f3+31:
        0000000000401774        insn: eb 04                     br_cntr: branch-instructions:ppp 2 branch-misses 0      # PRED 5 cycles [5]
        000000000040177a        insn: 81 7d fc 0f 27 00 00
        0000000000401781        insn: 7e e3                     br_cntr: branch-instructions:ppp 1 branch-misses 0      # PRED 1 cycles [6] 2.00 IPC
        0000000000401766        insn: 8b 45 fc
        0000000000401769        insn: 83 e0 01
        000000000040176c        insn: 85 c0
        000000000040176e        insn: 74 06                     br_cntr: branch-instructions:ppp 1 branch-misses 0      # PRED 1 cycles [7] 4.00 IPC
        0000000000401776        insn: 83 45 fc 01
        000000000040177a        insn: 81 7d fc 0f 27 00 00
        0000000000401781        insn: 7e e3                     br_cntr: branch-instructions:ppp 1 branch-misses 0      # PRED 7 cycles [14] 0.43 IPC

Originally-by: Tinghao Zhang <tinghao.zhang@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20240813160208.2493643-9-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Kan Liang
2024-08-13 09:02:07 -07:00
committed by Arnaldo Carvalho de Melo
parent e6952dcec8
commit 6f9d8d1de2
2 changed files with 63 additions and 8 deletions
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2
tools/perf/Documentation/perf-script.txt
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@@ -134,7 +134,7 @@ OPTIONS
srcline, period, iregs, uregs, brstack, brstacksym, flags, bpf-output,
brstackinsn, brstackinsnlen, brstackdisasm, brstackoff, callindent, insn, disasm,
insnlen, synth, phys_addr, metric, misc, srccode, ipc, data_page_size,
code_page_size, ins_lat, machine_pid, vcpu, cgroup, retire_lat,
code_page_size, ins_lat, machine_pid, vcpu, cgroup, retire_lat, brcntr,
Field list can be prepended with the type, trace, sw or hw,
to indicate to which event type the field list applies.