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linux/tools/perf/scripts/python
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Leo Yan a9e99b860f perf cs-etm: Filter synthesized branch samples 
The itrace 'c' and 'r' options request synthesized branch events for
calls and returns only. For perf script the default itrace options are
"--itrace=ce", so CS ETM should emit call branches and error events by
default.

CS ETM currently synthesizes a branch sample for every decoded taken
branch whenever branch synthesis is enabled. This produces redundant
jump and conditional branch samples.

Add a branch filter derived from the itrace calls and returns options.
When neither option is set, keep the existing behavior and synthesize all
branch samples. When calls or returns are requested, emit only branch
samples whose flags match the selected branch type, while preserving trace
begin/end markers.

Also update test_arm_coresight_disasm.sh and arm-cs-trace-disasm.py
to use the --itrace=b option for generating branch samples.

Before:

  perf script -F,+flags

  callchain_test    6114 [005] 331519.825214:          1 branches:   tr strt jmp                           0 [unknown] ([unknown]) => ffff8000803a3a68 perf_report_aux_output_id+0x50 ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   call                   ffff8000803a3a74 perf_report_aux_output_id+0x5c ([kernel.kallsyms]) => ffff8000817f4d88 memset+0x0 ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   jmp                    ffff8000817f4d8c memset+0x4 ([kernel.kallsyms]) => ffff8000817f4c00 __pi_memset_generic+0x0 ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   jcc                    ffff8000817f4c1c __pi_memset_generic+0x1c ([kernel.kallsyms]) => ffff8000817f4c44 __pi_memset_generic+0x44 ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   jcc                    ffff8000817f4c4c __pi_memset_generic+0x4c ([kernel.kallsyms]) => ffff8000817f4c5c __pi_memset_generic+0x5c ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   jcc                    ffff8000817f4c5c __pi_memset_generic+0x5c ([kernel.kallsyms]) => ffff8000817f4cf0 __pi_memset_generic+0xf0 ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   jcc                    ffff8000817f4d30 __pi_memset_generic+0x130 ([kernel.kallsyms]) => ffff8000817f4d68 __pi_memset_generic+0x168 ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   jcc                    ffff8000817f4d78 __pi_memset_generic+0x178 ([kernel.kallsyms]) => ffff8000817f4d6c __pi_memset_generic+0x16c ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   jcc                    ffff8000817f4d78 __pi_memset_generic+0x178 ([kernel.kallsyms]) => ffff8000817f4d6c __pi_memset_generic+0x16c ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   jcc                    ffff8000817f4d78 __pi_memset_generic+0x178 ([kernel.kallsyms]) => ffff8000817f4d6c __pi_memset_generic+0x16c ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   return                 ffff8000817f4d84 __pi_memset_generic+0x184 ([kernel.kallsyms]) => ffff8000803a3a78 perf_report_aux_output_id+0x60 ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   jcc                    ffff8000803a3a98 perf_report_aux_output_id+0x80 ([kernel.kallsyms]) => ffff8000803a3b04 perf_report_aux_output_id+0xec ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   call                   ffff8000803a3b1c perf_report_aux_output_id+0x104 ([kernel.kallsyms]) => ffff8000803a38f8 __perf_event_header__init_id+0x0 ([kernel.kallsyms])

After:

  callchain_test    6114 [005] 331519.825214:          1 branches:   tr strt jmp                           0 [unknown] ([unknown]) => ffff8000803a3a68 perf_report_aux_output_id+0x50 ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   call                   ffff8000803a3a74 perf_report_aux_output_id+0x5c ([kernel.kallsyms]) => ffff8000817f4d88 memset+0x0 ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   call                   ffff8000803a3b1c perf_report_aux_output_id+0x104 ([kernel.kallsyms]) => ffff8000803a38f8 __perf_event_header__init_id+0x0 ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   call                   ffff8000803a39c0 __perf_event_header__init_id+0xc8 ([kernel.kallsyms]) => ffff800080105258 __task_pid_nr_ns+0x0 ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   call                   ffff80008010528c __task_pid_nr_ns+0x34 ([kernel.kallsyms]) => ffff8000801d5610 __rcu_read_lock+0x0 ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   call                   ffff8000801052b0 __task_pid_nr_ns+0x58 ([kernel.kallsyms]) => ffff800080192078 lock_acquire+0x0 ([kernel.kallsyms])
  callchain_test    6114 [005] 331519.825214:          1 branches:   call                   ffff8000801923f4 lock_acquire+0x37c ([kernel.kallsyms]) => ffff8000801d6da0 rcu_is_watching+0x0 ([kernel.kallsyms])

Fixes: b12235b113 ("perf tools: Add mechanic to synthesise CoreSight trace packets")
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
2026-07-03 16:51:59 -07:00
..
bin perf script: Fix hangup in offline flamegraph report 2025-02-18 16:12:19 -08:00
Perf-Trace-Util perf script: Fix script_fetch_insn for more than just x86 2026-01-27 01:35:22 -03:00
arm-cs-trace-disasm.py perf cs-etm: Filter synthesized branch samples 2026-07-03 16:51:59 -07:00
check-perf-trace.py perf script python: add Python3 support to check-perf-trace.py 2019-03-06 18:10:46 -03:00
compaction-times.py perf tools: Address python 3.6 DeprecationWarning for string scapes 2023-11-23 10:56:09 -03:00
event_analyzing_sample.py perf script python: Add Python3 support to event_analyzing_sample.py 2019-03-06 18:11:11 -03:00
export-to-postgresql.py perf scripts python: export-to-postgresql.py: Export all sample flags 2022-02-15 17:15:07 -03:00
export-to-sqlite.py perf scripts python: export-to-sqlite.py: Export all sample flags 2022-02-15 17:15:05 -03:00
exported-sql-viewer.py perf scripts python: exported-sql-viewer.py: Fix pattern matching with Python 3 2025-05-12 14:18:16 -03:00
failed-syscalls-by-pid.py perf script python: Remove mixed indentation 2019-03-06 18:09:14 -03:00
flamegraph.py perf flamegraph: Fix minor pylint/type hint issues 2025-07-16 10:43:27 -07:00
futex-contention.py perf script: Add min, max to futex-contention output, in addition to avg 2020-09-23 12:58:53 -03:00
gecko.py perf scripts python gecko: Launch the profiler UI on the default browser with the appropriate URL 2023-08-24 14:41:49 -03:00
intel-pt-events.py perf scripts python intel-pt-events: Delete unused 'event_attr variable 2023-04-12 12:19:42 -03:00
libxed.py perf scripting python: exported-sql-viewer.py: Factor out libxed.py 2021-06-01 10:05:08 -03:00
mem-phys-addr.py perf script python: Improve physical mem type resolution 2024-12-09 17:51:53 -03:00
net_dropmonitor.py perf script: Add new parameter in kfree_skb tracepoint to the python scripts using it 2023-05-02 08:36:14 -03:00
netdev-times.py perf script: netdev-times: add location parameter to consume_skb 2024-06-06 23:29:23 -07:00
parallel-perf.py tools/perf: Fix parallel-perf python script to replace new python syntax ":=" usage 2024-06-25 11:06:19 -07:00
powerpc-hcalls.py perf scripts: Add configurable sorting option to powerpc-hcalls 2026-06-30 10:24:21 -07:00
sched-migration.py perf script python: Remove mixed indentation 2019-03-06 18:09:14 -03:00
sctop.py perf script python: Remove mixed indentation 2019-03-06 18:09:14 -03:00
stackcollapse.py perf script python: Remove mixed indentation 2019-03-06 18:09:14 -03:00
stat-cpi.py perf script python: Add Python3 support to stat-cpi.py 2019-02-25 17:17:07 -03:00
syscall-counts-by-pid.py perf script python: Remove mixed indentation 2019-03-06 18:09:14 -03:00
syscall-counts.py perf script python: Remove mixed indentation 2019-03-06 18:09:14 -03:00
task-analyzer.py perf script task-analyzer: Fix spelling mistake "miliseconds" -> "milliseconds" 2023-04-17 22:24:14 -03:00