From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy1-f201.google.com (mail-dy1-f201.google.com [74.125.82.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A917740243B for ; Tue, 28 Apr 2026 07:20:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777360852; cv=none; b=Ky3yJHeGb6/HGXJR453JECsvjYclsZYLpmML9qij48FiB5cWFQwbumX2wAsPatJo1HMCZPdFiRnSAeS3Mw5GPehURNqmLUm3jIOu9dI/Rds5FF8JOjvYYQHFAmPMmS9JQ4Wk6w3mm41GeImsPlRgBM8hvdx7N9ZFhdn5UKAAiKQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777360852; c=relaxed/simple; bh=5gMnnOsYKM+JhLn9wx2zoIzOqskbDsFXIF1JO3ndg5Y=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Xg0A+XC8vSyPEml5hx+81zFrBXYN5bkQAOTZiJfWkmTvqHKW9ukL05G59z8brx0SJBbOOLRbf9nq/TaSsA9bFs84R7n3AGKaU9CbyEtCtQzjQRaiTXYADp/4SYH10KJJZqPgM0mBRKbfS/Vwk/UwrUGlv/PpNc6o6QdEKH6moGw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=dHky0VWy; arc=none smtp.client-ip=74.125.82.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="dHky0VWy" Received: by mail-dy1-f201.google.com with SMTP id 5a478bee46e88-2c0f6593ef5so14539075eec.1 for ; Tue, 28 Apr 2026 00:20:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1777360850; x=1777965650; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=nQeNxtOSoOXwV2zRr64LvO5u7apubipAzZoDUg3KnRw=; b=dHky0VWyQI5FcG9S2z59rUfIkSJmTaAwPA696eMFEd5D0FFvHOfDi9aQo2CakNNuq6 rBSCQFa1wmxcNWZa8O+Mcn6F3b6pfUH/QUWuE1Z1NzIidsLepQ0jPUVNMrVVFQbQEaB8 VbFXfDF6c5CKJFCRnzRfXJW8dT1MwWHWb7PUEw4r8xhQsgmFtxOIE14YKvHpOFmLkkbh Q8il87Fv07asgXD0ObTZ0WNV7rDbCEl5LvD68SplnkwP3NFEWITHKt3Pz7hvNL57Vp+K lAqFkAgrZ9ofe9Godemq9CYrvisQq+Im4HaEA1hHlFOZk/TOrzvzcVLCTblpmYUWq+K2 F8PA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777360850; x=1777965650; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=nQeNxtOSoOXwV2zRr64LvO5u7apubipAzZoDUg3KnRw=; b=RO8VNXUqkIKykI0FG8Yuv3nqeQe+rzkoaEycJsztcewfGP3QrfQaIifQTGt5ANH7Vm gH70oVynzfsd/HiWnaLtpu9hmZaOh1L1PlcNOR/Ji5Vdyklm1qEq/ldK+HZ2mCjEMXQP VaZ1Bv4lsQlBWRtL834zb6/xSb7IVnSbbN2Ax5PqHZXb8+OyWlIUJuNyeTlDmccebsld AxeIcPm06psvqri1l1BU1vHTgCqsyKzZ+6eLZyIu0N2L+3fxd90EieGvhVZVThrFqvQ4 +WWW7xq34V/RaR45AgKAX4FkdzbnHjBLYo2jJLPTBwPeKxPK2Xw1+dPoHT/kz3+BgLPN 1lgg== X-Forwarded-Encrypted: i=1; AFNElJ+xPvCD9iC/+gGWFavcpl0L7T/gcLr6sZMGUKFdgpp0G0vsQgoxO+MmLF1C3Jyy13baAvYK8gseaqsGuG5fWb2z@vger.kernel.org X-Gm-Message-State: AOJu0YynM75KN2iZxpCdOWUle8aUiQXveUNDMDt6Cf6TEQW/z3o5o1qX iKkCVZDJqUPn+BePPbR1/lrSNdIA255kYCLksxrb9+cXATcR9xvZDnSMHnkFVCCqLnggd+O6Sgt Y9KlMkNdgpw== X-Received: from dlbqc1.prod.google.com ([2002:a05:7023:a81:b0:12c:87ba:191d]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7022:251f:b0:12d:de3f:d84b with SMTP id a92af1059eb24-12dde3fdd81mr457375c88.36.1777360849585; Tue, 28 Apr 2026 00:20:49 -0700 (PDT) Date: Tue, 28 Apr 2026 00:18:50 -0700 In-Reply-To: <20260428071903.1886173-1-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: <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: <20260428071903.1886173-46-irogers@google.com> Subject: [PATCH v8 45/58] perf stackcollapse: Port stackcollapse 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" Modernize the legacy stackcollapse.py trace script by refactoring it into a class-based architecture (StackCollapseAnalyzer). The script uses perf.session for event processing and aggregates call stacks to produce output suitable for flame graphs. Assisted-by: Gemini:gemini-3.1-pro-preview Signed-off-by: Ian Rogers --- v2: - Fixed Callchain Check: Replaced hasattr(sample, "callchain") with getattr(sample, "callchain", None) and checked if it is not None . This avoids attempting to iterate over None when a sample lacks a callchain, which would raise a TypeError. - Fixed Comm Resolution: The code already used self.session.process(sample.sample_pid).comm() to resolve the command name using the session object (if available), avoiding the missing comm attribute on perf.sample_event. - Code Cleanup: Broke a long line in process_event to satisfy pylint. --- tools/perf/python/stackcollapse.py | 126 +++++++++++++++++++++++++++++ 1 file changed, 126 insertions(+) create mode 100755 tools/perf/python/stackcollapse.py diff --git a/tools/perf/python/stackcollapse.py b/tools/perf/python/stackcollapse.py new file mode 100755 index 000000000000..996c73246ebc --- /dev/null +++ b/tools/perf/python/stackcollapse.py @@ -0,0 +1,126 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0 +""" +stackcollapse.py - format perf samples with one line per distinct call stack + +This script's output has two space-separated fields. The first is a semicolon +separated stack including the program name (from the "comm" field) and the +function names from the call stack. The second is a count: + + swapper;start_kernel;rest_init;cpu_idle;default_idle;native_safe_halt 2 + +The file is sorted according to the first field. + +Ported from tools/perf/scripts/python/stackcollapse.py +""" + +import argparse +from collections import defaultdict +import sys +import perf + + +class StackCollapseAnalyzer: + """Accumulates call stacks and prints them collapsed.""" + + def __init__(self, args: argparse.Namespace) -> None: + self.args = args + self.lines: dict[str, int] = defaultdict(int) + + def tidy_function_name(self, sym: str, dso: str) -> str: + """Beautify function names based on options.""" + if sym is None: + sym = "[unknown]" + + sym = sym.replace(";", ":") + if self.args.tidy_java: + # Beautify Java signatures + sym = sym.replace("<", "") + sym = sym.replace(">", "") + if sym.startswith("L") and "/" in sym: + sym = sym[1:] + try: + sym = sym[:sym.index("(")] + except ValueError: + pass + + if self.args.annotate_kernel and dso == "[kernel.kallsyms]": + return sym + "_[k]" + return sym + + def process_event(self, sample: perf.sample_event) -> None: + """Collect call stack for each sample.""" + stack = [] + callchain = getattr(sample, "callchain", None) + if callchain is not None: + for node in callchain: + stack.append(self.tidy_function_name(node.symbol, node.dso)) + else: + # Fallback if no callchain + sym = getattr(sample, "symbol", "[unknown]") + dso = getattr(sample, "dso", "[unknown]") + stack.append(self.tidy_function_name(sym, dso)) + + if self.args.include_comm: + if hasattr(self, 'session') and self.session: + comm = self.session.find_thread(sample.sample_pid).comm() + else: + comm = "Unknown" + comm = comm.replace(" ", "_") + sep = "-" + if self.args.include_pid: + comm = f"{comm}{sep}{getattr(sample, 'sample_pid', 0)}" + sep = "/" + if self.args.include_tid: + comm = f"{comm}{sep}{getattr(sample, 'sample_tid', 0)}" + stack.append(comm) + + stack_string = ";".join(reversed(stack)) + self.lines[stack_string] += 1 + + def print_totals(self) -> None: + """Print sorted collapsed stacks.""" + for stack in sorted(self.lines): + print(f"{stack} {self.lines[stack]}") + + +def main(): + """Main function.""" + ap = argparse.ArgumentParser( + description="Format perf samples with one line per distinct call stack" + ) + ap.add_argument("-i", "--input", default="perf.data", help="Input file name") + ap.add_argument("--include-tid", action="store_true", help="include thread id in stack") + ap.add_argument("--include-pid", action="store_true", help="include process id in stack") + ap.add_argument("--no-comm", dest="include_comm", action="store_false", default=True, + help="do not separate stacks according to comm") + ap.add_argument("--tidy-java", action="store_true", help="beautify Java signatures") + ap.add_argument("--kernel", dest="annotate_kernel", action="store_true", + help="annotate kernel functions with _[k]") + + args = ap.parse_args() + + if args.include_tid and not args.include_comm: + print("requesting tid but not comm is invalid", file=sys.stderr) + sys.exit(1) + if args.include_pid and not args.include_comm: + print("requesting pid but not comm is invalid", file=sys.stderr) + sys.exit(1) + + analyzer = StackCollapseAnalyzer(args) + + try: + session = perf.session(perf.data(args.input), sample=analyzer.process_event) + analyzer.session = session + session.process_events() + except IOError as e: + print(f"Error: {e}", file=sys.stderr) + sys.exit(1) + except KeyboardInterrupt: + pass + + analyzer.print_totals() + + +if __name__ == "__main__": + main() -- 2.54.0.545.g6539524ca2-goog