Messages in this thread Patch in this message |  | | Date | Tue, 28 Apr 2026 00:18:32 -0700 | | Subject | [PATCH v8 27/58] perf syscall-counts: Port syscall-counts to use python module | | From | Ian Rogers <> |
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Rewrite tools/perf/scripts/python/syscall-counts.py to use the python module and various style changes. By avoiding the overheads in the `perf script` execution the performance improves by more than 4x as shown in the following (with PYTHON_PATH and PERF_EXEC_PATH set as necessary):
``` $ perf record -e raw_syscalls:sys_enter -a sleep 1 ... $ time perf script tools/perf/scripts/python/syscall-counts.py perf Install the python-audit package to get syscall names. For example: # apt-get install python3-audit (Ubuntu) # yum install python3-audit (Fedora) etc.
Press control+C to stop and show the summary Warning: 1 out of order events recorded.
syscall events for perf:
event count -------------------------------------- ------------ 1 538989 16 32 203 17 3 2 257 1 204 1 15 1 7 1 0 1
real 0m3.887s user 0m3.578s sys 0m0.308s $ time python3 tools/perf/python/syscall-counts.py perf Warning: 1 out of order events recorded.
syscall events for perf:
event count -------------------------------------- ------------ write 538989 ioctl 32 sched_setaffinity 17 close 2 openat 1 sched_getaffinity 1 rt_sigreturn 1 poll 1 read 1
real 0m0.953s user 0m0.905s sys 0m0.048s ```
Assisted-by: Gemini:gemini-3.1-pro-preview Signed-off-by: Ian Rogers <irogers@google.com> --- v2:
1. Fallback for Unknown Syscalls: If perf.syscall_name() returns None for an unmapped ID, the script now falls back to using the numeric ID string. This prevents a TypeError when applying string alignment formatting.
2. Fallback for Syscall Number Attribute: The script now checks for __syscall_nr first, and if not present (as on some older kernels), falls back to checking for nr .
3. Robust Process Resolution: Added a try-except block around session.process(sample.pid).comm() . If the process lookup fails (returning NULL/None), it falls back to "unknown" instead of letting a TypeError crash the script.
4. Support for Custom Input Files: Added a -i / --input command-line argument to allow processing arbitrarily named trace files, removing the hardcoded "perf.data" restriction. --- tools/perf/python/syscall-counts.py | 72 +++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100755 tools/perf/python/syscall-counts.py
diff --git a/tools/perf/python/syscall-counts.py b/tools/perf/python/syscall-counts.py new file mode 100755 index 000000000000..ef2bd8c7b24c --- /dev/null +++ b/tools/perf/python/syscall-counts.py @@ -0,0 +1,72 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0 +""" +Displays system-wide system call totals, broken down by syscall. + +If a [comm] arg is specified, only syscalls called by [comm] are displayed. +""" + +import argparse +from collections import defaultdict +from typing import DefaultDict +import perf + +syscalls: DefaultDict[int, int] = defaultdict(int) +for_comm = None +session = None + + +def print_syscall_totals(): + """Print aggregated statistics.""" + if for_comm is not None: + print(f"\nsyscall events for {for_comm}:\n") + else: + print("\nsyscall events:\n") + + print(f"{'event':<40} {'count':>10}") + print("---------------------------------------- -----------") + + for sc_id, val in sorted(syscalls.items(), + key=lambda kv: (kv[1], kv[0]), reverse=True): + name = perf.syscall_name(sc_id) or str(sc_id) + print(f"{name:<40} {val:>10}") + + +def process_event(sample): + """Process a single sample event.""" + event_name = str(sample.evsel) + if event_name == "evsel(raw_syscalls:sys_enter)": + sc_id = getattr(sample, "id", -1) + elif event_name.startswith("evsel(syscalls:sys_enter_"): + sc_id = getattr(sample, "__syscall_nr", None) + if sc_id is None: + sc_id = getattr(sample, "nr", -1) + else: + return + + if sc_id == -1: + return + + comm = "unknown" + try: + if session: + proc = session.find_thread(sample.sample_pid) + if proc: + comm = proc.comm() + except (TypeError, AttributeError): + pass + + if for_comm and comm != for_comm: + return + syscalls[sc_id] += 1 + + +if __name__ == "__main__": + ap = argparse.ArgumentParser() + ap.add_argument("comm", nargs="?", help="Only report syscalls for comm") + ap.add_argument("-i", "--input", default="perf.data", help="Input file name") + args = ap.parse_args() + for_comm = args.comm + session = perf.session(perf.data(args.input), sample=process_event) + session.process_events() + print_syscall_totals() -- 2.54.0.545.g6539524ca2-goog
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