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Tue, 28 Apr 2026 00:20:53 -0700 (PDT) Date: Tue, 28 Apr 2026 00:18:52 -0700 In-Reply-To: <20260428071903.1886173-1-irogers@google.com> Mime-Version: 1.0 References: <20260425224951.174663-1-irogers@google.com> <20260428071903.1886173-1-irogers@google.com> X-Mailer: git-send-email 2.54.0.545.g6539524ca2-goog Message-ID: <20260428071903.1886173-48-irogers@google.com> Subject: [PATCH v8 47/58] perf failed-syscalls: Port failed-syscalls to use python module From: Ian Rogers To: acme@kernel.org, namhyung@kernel.org Cc: adrian.hunter@intel.com, alice.mei.rogers@gmail.com, dapeng1.mi@linux.intel.com, james.clark@linaro.org, leo.yan@linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, tmricht@linux.ibm.com, Ian Rogers Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260428_002056_388477_5BA44B28 X-CRM114-Status: GOOD ( 15.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Port the legacy Perl script failed-syscalls.pl to a python script using the perf module in tools/perf/python. The new script uses a class-based architecture and leverages the perf.session API for event processing, making it a standalone script that reads perf.data files. It filters for sys_exit events, checks for failed syscalls (where return value ret < 0), and aggregates counts per command name. Complications: - The script is designed for file-based processing using perf.session. - pylint warns about the module name not being snake_case, but it is kept for consistency with the original script name. Assisted-by: Gemini:gemini-3.1-pro-preview Signed-off-by: Ian Rogers --- tools/perf/python/failed-syscalls.py | 78 ++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100755 tools/perf/python/failed-syscalls.py diff --git a/tools/perf/python/failed-syscalls.py b/tools/perf/python/failed-syscalls.py new file mode 100755 index 000000000000..c3b58664eb57 --- /dev/null +++ b/tools/perf/python/failed-syscalls.py @@ -0,0 +1,78 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0 +"""Failed system call counts.""" + +import argparse +from collections import defaultdict +import sys +from typing import Optional +import perf + +class FailedSyscalls: + """Tracks and displays failed system call totals.""" + def __init__(self, comm: Optional[str] = None) -> None: + self.failed_syscalls: dict[str, int] = defaultdict(int) + self.for_comm = comm + self.session: Optional[perf.session] = None + self.unhandled: dict[str, int] = defaultdict(int) + + def process_event(self, sample: perf.sample_event) -> None: + """Process sys_exit events.""" + event_name = str(sample.evsel) + if not event_name.startswith("evsel(syscalls:sys_exit_") and \ + not event_name.startswith("evsel(raw_syscalls:sys_exit_"): + return + + try: + ret = sample.ret + except AttributeError: + self.unhandled[event_name] += 1 + return + + if ret >= 0: + return + + pid = sample.sample_pid + assert self.session is not None + try: + comm = self.session.find_thread(pid).comm() + except Exception: # pylint: disable=broad-except + comm = "unknown" + + if self.for_comm and comm != self.for_comm: + return + + self.failed_syscalls[comm] += 1 + + def print_totals(self) -> None: + """Print summary table.""" + print("\nfailed syscalls by comm:\n") + print(f"{'comm':<20s} {'# errors':>10s}") + print(f"{'-'*20} {'-'*10}") + + for comm, val in sorted(self.failed_syscalls.items(), + key=lambda kv: (kv[1], kv[0]), reverse=True): + print(f"{comm:<20s} {val:10d}") + + def run(self, input_file: str) -> None: + """Run the session.""" + self.session = perf.session(perf.data(input_file), sample=self.process_event) + self.session.process_events() + self.print_totals() + +def main() -> None: + """Main function.""" + parser = argparse.ArgumentParser(description="Trace failed syscalls") + parser.add_argument("comm", nargs="?", help="Filter by command name") + parser.add_argument("-i", "--input", default="perf.data", help="Input file") + args = parser.parse_args() + + analyzer = FailedSyscalls(args.comm) + try: + analyzer.run(args.input) + except IOError as e: + print(e, file=sys.stderr) + sys.exit(1) + +if __name__ == "__main__": + main() -- 2.54.0.545.g6539524ca2-goog