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AFNElJ9GOWf8YIbMHgrpz5XCZeVe9zs7rJ/zjZ+pGZ5SoSxdJwRsOpZdWTWItF/LiG9QY99bGiAf4mRgQBy6n2KT1nOV@vger.kernel.org X-Gm-Message-State: AOJu0YyL50HdUjXppwsK2+Z7iHiXwMEJdhNocd1iKLL30T3hL/3Hk8BE OIreBustgN+iW0VE/Tk578QDjDTlVAq8R+8LrRC577pYKvlakrxkEg/mo6yP7wpiO0SVMht+2/y sJ5MiO4afTQ== X-Received: from dybtv6.prod.google.com ([2002:a05:7300:f486:b0:2d8:5b05:964b]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7300:2d15:b0:2e7:5737:8364 with SMTP id 5a478bee46e88-2e75746d9c9mr2508476eec.15.1776643213698; Sun, 19 Apr 2026 17:00:13 -0700 (PDT) Date: Sun, 19 Apr 2026 16:58:35 -0700 In-Reply-To: <20260419235911.2186050-1-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: <20260419235911.2186050-1-irogers@google.com> X-Mailer: git-send-email 2.54.0.rc1.513.gad8abe7a5a-goog Message-ID: <20260419235911.2186050-24-irogers@google.com> Subject: [PATCH v1 23/58] perf python: Add LiveSession helper From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Jiri Olsa , Adrian Hunter , James Clark , Alice Rogers , Suzuki K Poulose , Mike Leach , John Garry , Leo Yan , Yicong Yang , Jonathan Cameron , Nick Terrell , David Sterba , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Alexandre Chartre , Dmitrii Dolgov <9erthalion6@gmail.com>, Yuzhuo Jing , Blake Jones , Changbin Du , Gautam Menghani , Wangyang Guo , Pan Deng , Zhiguo Zhou , Tianyou Li , Thomas Falcon , Athira Rajeev , Collin Funk , Dapeng Mi , Ravi Bangoria , Zecheng Li , tanze , Thomas Richter , Ankur Arora , "Tycho Andersen (AMD)" , Howard Chu , Sun Jian , Derek Foreman , Swapnil Sapkal , Anubhav Shelat , Ricky Ringler , Qinxin Xia , Aditya Bodkhe , Chun-Tse Shao , Stephen Brennan , Yang Li , Chuck Lever , Chen Ni , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org Cc: Ian Rogers Content-Type: text/plain; charset="UTF-8" Add LiveSession class in tools/perf/python/perf_live.py to support live event collection using perf.evlist and perf.parse_events, avoiding the need to fork a separate perf record process. Signed-off-by: Ian Rogers Assisted-by: Gemini:gemini-3.1-pro-preview --- tools/perf/python/perf_live.py | 42 ++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100755 tools/perf/python/perf_live.py diff --git a/tools/perf/python/perf_live.py b/tools/perf/python/perf_live.py new file mode 100755 index 000000000000..81d92f720b58 --- /dev/null +++ b/tools/perf/python/perf_live.py @@ -0,0 +1,42 @@ +# SPDX-License-Identifier: GPL-2.0 +""" +Live event session helper using perf.evlist. + +This module provides a LiveSession class that allows running a callback +for each event collected live from the system, similar to perf.session +but without requiring a perf.data file. +""" + +import perf + + +class LiveSession: + """Represents a live event collection session.""" + + def __init__(self, event_string: str, sample_callback): + self.event_string = event_string + self.sample_callback = sample_callback + # Create a cpu map for all online CPUs + self.cpus = perf.cpu_map() + # Parse events and set maps + self.evlist = perf.parse_events(self.event_string, self.cpus) + + def run(self): + """Run the live session.""" + self.evlist.open() + self.evlist.mmap() + + try: + while True: + # Poll for events with 100ms timeout + self.evlist.poll(100) + for cpu in self.cpus: + event = self.evlist.read_on_cpu(cpu) + while event: + if event.type == perf.RECORD_SAMPLE: + self.sample_callback(event) + event = self.evlist.read_on_cpu(cpu) + except KeyboardInterrupt: + pass + finally: + self.evlist.close() -- 2.54.0.rc1.513.gad8abe7a5a-goog