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AFNElJ9RGlAlyw6bb8OacZQTt2Q4NZlVO3D66pIt5xr2qMKUkQAH10NA/IUj+/B+JXWlPOZdYODWBlNODwJsyOsoGzC1@vger.kernel.org X-Gm-Message-State: AOJu0YzfGT3kNM8hdoQyaoZfuE3CE2BIm0wixT0t+EllQhPH/6TfC04C du95qmhVlk8LkEnoFhlqCsXqvMzD8u4DFIuHzhmwJJ+BsJ9RC99DpPz0A6dOSN7Xqs9LaDNJBwy 1B5qf+DkBzw== X-Received: from dybb21.prod.google.com ([2002:a05:693c:6095:b0:2d9:61d4:4d0e]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7300:a191:b0:2be:6693:9b4d with SMTP id 5a478bee46e88-2e42cd45b4cmr13181217eec.9.1776960687165; Thu, 23 Apr 2026 09:11:27 -0700 (PDT) Date: Thu, 23 Apr 2026 09:09:44 -0700 In-Reply-To: <20260423161006.1762700-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260423035526.1537178-1-irogers@google.com> <20260423161006.1762700-1-irogers@google.com> X-Mailer: git-send-email 2.54.0.rc2.533.g4f5dca5207-goog Message-ID: <20260423161006.1762700-38-irogers@google.com> Subject: [PATCH v3 37/58] perf failed-syscalls-by-pid: Port failed-syscalls-by-pid to use python module From: Ian Rogers To: irogers@google.com, acme@kernel.org, adrian.hunter@intel.com, james.clark@linaro.org, leo.yan@linux.dev, namhyung@kernel.org, tmricht@linux.ibm.com Cc: 9erthalion6@gmail.com, adityab1@linux.ibm.com, alexandre.chartre@oracle.com, alice.mei.rogers@gmail.com, ankur.a.arora@oracle.com, ashelat@redhat.com, atrajeev@linux.ibm.com, blakejones@google.com, changbin.du@huawei.com, chuck.lever@oracle.com, collin.funk1@gmail.com, coresight@lists.linaro.org, ctshao@google.com, dapeng1.mi@linux.intel.com, derek.foreman@collabora.com, dsterba@suse.com, gautam@linux.ibm.com, howardchu95@gmail.com, john.g.garry@oracle.com, jolsa@kernel.org, jonathan.cameron@huawei.com, justinstitt@google.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, mike.leach@arm.com, mingo@redhat.com, morbo@google.com, nathan@kernel.org, nichen@iscas.ac.cn, nick.desaulniers+lkml@gmail.com, pan.deng@intel.com, peterz@infradead.org, ravi.bangoria@amd.com, ricky.ringler@proton.me, stephen.s.brennan@oracle.com, sun.jian.kdev@gmail.com, suzuki.poulose@arm.com, swapnil.sapkal@amd.com, tanze@kylinos.cn, terrelln@fb.com, thomas.falcon@intel.com, tianyou.li@intel.com, tycho@kernel.org, wangyang.guo@intel.com, xiaqinxin@huawei.com, yang.lee@linux.alibaba.com, yuzhuo@google.com, zhiguo.zhou@intel.com, zli94@ncsu.edu Content-Type: text/plain; charset="UTF-8" Ported from tools/perf/scripts/python/failed-syscalls-by-pid.py to use the perf Python module API. Key changes: - Used perf.syscall_name() to resolve syscall names instead of legacy Util library. - Used standard collections.defaultdict for nested statistics aggregation. - Used errno.errorcode for resolving error strings. - Supported optional filtering by COMM or PID via command line arguments. Assisted-by: Gemini:gemini-3.1-pro-preview Signed-off-by: Ian Rogers --- v2: Fixed Syscall Name Fallback: Handled the case where perf.syscall_name() returns None , falling back to the string representation of the syscall ID to avoid TypeError during string formatting. --- tools/perf/python/failed-syscalls-by-pid.py | 119 ++++++++++++++++++++ 1 file changed, 119 insertions(+) create mode 100755 tools/perf/python/failed-syscalls-by-pid.py diff --git a/tools/perf/python/failed-syscalls-by-pid.py b/tools/perf/python/failed-syscalls-by-pid.py new file mode 100755 index 000000000000..1a8c9bb7e90c --- /dev/null +++ b/tools/perf/python/failed-syscalls-by-pid.py @@ -0,0 +1,119 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0 +""" +Displays system-wide failed system call totals, broken down by pid. +If a [comm] or [pid] arg is specified, only syscalls called by it are displayed. + +Ported from tools/perf/scripts/python/failed-syscalls-by-pid.py +""" + +import argparse +from collections import defaultdict +import errno +from typing import Optional +import perf + + +def strerror(nr: int) -> str: + """Return error string for a given errno.""" + try: + return errno.errorcode[abs(nr)] + except KeyError: + return f"Unknown {nr} errno" + + +class SyscallAnalyzer: + """Analyzes failed syscalls and aggregates counts.""" + + def __init__(self, for_comm: Optional[str] = None, for_pid: Optional[int] = None): + self.for_comm = for_comm + self.for_pid = for_pid + self.session: Optional[perf.session] = None + self.syscalls: dict[tuple[str, int, int, int], int] = defaultdict(int) + self.unhandled: dict[str, int] = defaultdict(int) + + def process_event(self, sample: perf.sample_event) -> None: + """Process a single sample event.""" + event_name = str(sample.evsel) + if "sys_exit" not in event_name: + return + + pid = sample.sample_pid + if hasattr(self, 'session') and self.session: + comm = self.session.process(pid).comm() + else: + comm = "Unknown" + + if self.for_comm and comm != self.for_comm: + return + if self.for_pid and pid != self.for_pid: + return + + ret = getattr(sample, "ret", 0) + if ret < 0: + syscall_id = getattr(sample, "id", -1) + if syscall_id == -1: + syscall_id = getattr(sample, "sys_id", -1) + + if syscall_id != -1: + self.syscalls[(comm, pid, syscall_id, ret)] += 1 + else: + self.unhandled[event_name] += 1 + + def print_summary(self) -> None: + """Print aggregated statistics.""" + if self.for_comm is not None: + print(f"\nsyscall errors for {self.for_comm}:\n") + elif self.for_pid is not None: + print(f"\nsyscall errors for PID {self.for_pid}:\n") + else: + print("\nsyscall errors:\n") + + print(f"{'comm [pid]':<30} {'count':>10}") + print(f"{'-' * 30:<30} {'-' * 10:>10}") + + sorted_keys = sorted(self.syscalls.keys(), key=lambda k: (k[0], k[1], k[2])) + current_comm_pid = None + for comm, pid, syscall_id, ret in sorted_keys: + if current_comm_pid != (comm, pid): + print(f"\n{comm} [{pid}]") + current_comm_pid = (comm, pid) + try: + name = perf.syscall_name(syscall_id) or str(syscall_id) + except AttributeError: + name = str(syscall_id) + print(f" syscall: {name:<16}") + err_str = strerror(ret) + count = self.syscalls[(comm, pid, syscall_id, ret)] + print(f" err = {err_str:<20} {count:10d}") + + +if __name__ == "__main__": + ap = argparse.ArgumentParser( + description="Displays system-wide failed system call totals, broken down by pid.") + ap.add_argument("-i", "--input", default="perf.data", + help="Input file name") + ap.add_argument("filter", nargs="?", help="COMM or PID to filter by") + args = ap.parse_args() + + F_COMM = None + F_PID = None + + if args.filter: + try: + F_PID = int(args.filter) + except ValueError: + F_COMM = args.filter + + analyzer = SyscallAnalyzer(F_COMM, F_PID) + + try: + print("Press control+C to stop and show the summary") + session = perf.session(perf.data(args.input), sample=analyzer.process_event) + analyzer.session = session + session.process_events() + analyzer.print_summary() + except KeyboardInterrupt: + analyzer.print_summary() + except Exception as e: + print(f"Error processing events: {e}") -- 2.54.0.rc2.533.g4f5dca5207-goog