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Mon, 28 Jul 2025 06:00:16 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0BF4520040; Mon, 28 Jul 2025 06:00:16 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7A62220043; Mon, 28 Jul 2025 06:00:12 +0000 (GMT) Received: from li-c6426e4c-27cf-11b2-a85c-95d65bc0de0e.ibm.com.com (unknown [9.124.209.252]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 28 Jul 2025 06:00:12 +0000 (GMT) From: Gautam Menghani To: peterz@infradead.org, mingo@redhat.com, acme@kernel.org, namhyung@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com, kan.liang@linux.intel.com Cc: Gautam Menghani , maddy@linux.ibm.com, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] perf python: Add sampling.py as example for sampling Date: Mon, 28 Jul 2025 11:29:28 +0530 Message-ID: <20250728055937.58531-3-gautam@linux.ibm.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250728055937.58531-1-gautam@linux.ibm.com> References: <20250728055937.58531-1-gautam@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzI4MDA0MiBTYWx0ZWRfX/lguueOOtgfM Wh7mzELm9hp9A23ZxkM+xfBT9QBQGLzxnRYQafLigDAdJClFtRvxo6gza7EWWKGfosF0ZVV8NVX Ffi+f0WA+jIDviodcGRVq7Yb29FWlPFbk2oOqAfSUyZIfszIdpBZWOPC9+qGUBnRPqh1si735U4 NJgJqczbADFe717U+Djq2pa4jvcqvU6VXecNZN0bvmM2q9WmoCsuvsmcUigRxuatk/loqVXwa8c t2u/+At8Pmse54Z/IsbdJhlkV0LCXVhIWfr35+JusxG+LDXWAmXdxqb2I3uy0thKVU4kpS35Xn7 hW/zFo11WVMebphkfCMHLCkuxGl5N0op8KDRAfm6EuDRZ/DCHBgxPwG0A8UWEXZ50PlHUd7FLn6 q2jLOLDNXOX0Q4J/wMBVbY62rbjhM+lAyNufJHU7HQGu+1Ep1MS1WkKqqyegvp8hYg5WCn9o X-Authority-Analysis: v=2.4 cv=Je28rVKV c=1 sm=1 tr=0 ts=688711f6 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=Wb1JkmetP80A:10 a=VnNF1IyMAAAA:8 a=BcAa_kQfSTLkdWV7I_sA:9 X-Proofpoint-GUID: 7scDrOH8zODaMPoVWUNU5haszRnReSlp X-Proofpoint-ORIG-GUID: Fipa9eN_SySQPQOVzDWZXk-TX3sy7xnd X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-07-28_02,2025-07-24_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 clxscore=1015 lowpriorityscore=0 spamscore=0 adultscore=0 suspectscore=0 bulkscore=0 malwarescore=0 priorityscore=1501 phishscore=0 mlxscore=0 impostorscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507280042 Add sampling.py - a python version of sampling.c to demonstrate sampling events. Sample output: ``` $ sudo ./sampling.py libperf: mmap_per_cpu: nr cpu values 8 nr threads 1 libperf: idx 0: mmapping fd 3 libperf: idx 1: mmapping fd 4 libperf: idx 2: mmapping fd 5 libperf: idx 3: mmapping fd 6 libperf: idx 4: mmapping fd 7 libperf: idx 5: mmapping fd 8 libperf: idx 6: mmapping fd 9 libperf: idx 7: mmapping fd 10 cpu: 0 pid: 4168 tid: 4168 ip: 0x7fb274150c15 period: 345012 cpu: 1 pid: 57137 tid: 57137 ip: 0xffffffffc0745a2c period: 286666 cpu: 2 pid: 6247 tid: 6247 ip: 0x7fe10a883988 period: 391180 cpu: 3 pid: 0 tid: 0 ip: 0xffffffffa5413e67 period: 245301 cpu: 4 pid: 4168 tid: 4194 ip: 0xffffffffc086a1cc period: 269605 cpu: 5 pid: 0 tid: 0 ip: 0xffffffffa53bfcb1 period: 90978 cpu: 6 pid: 0 tid: 0 ip: 0xffffffffa6469333 period: 309112 ``` Signed-off-by: Gautam Menghani --- tools/perf/python/sampling.py | 49 +++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100755 tools/perf/python/sampling.py diff --git a/tools/perf/python/sampling.py b/tools/perf/python/sampling.py new file mode 100755 index 000000000000..b5f4e1362c63 --- /dev/null +++ b/tools/perf/python/sampling.py @@ -0,0 +1,49 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0 +# -*- python -*- +# -*- coding: utf-8 -*- + +import perf +import time + +def main(): + cpus = perf.cpu_map() + threads = perf.thread_map(-1) + + evlist = perf.parse_events('cpu-cycles', cpus, threads) + + tgt = perf.target(uses_mmap = True, default_per_cpu = True) + opts = perf.record_opts(freq=1000, target=tgt, sample_time=True, + sample_cpu=True, no_buffering=True, no_inherit=True) + for ev in evlist: + ev.tracking = False + ev.read_format = 0 + ev.sample_type = perf.SAMPLE_IP|perf.SAMPLE_TID|perf.SAMPLE_CPU|perf.SAMPLE_PERIOD + evlist.config(opts) + + evlist.open() + evlist.mmap() + + evlist.enable() + time.sleep(2) + evlist.disable() + + done = False + while done is False: + for cpu in cpus: + event = evlist.read_on_cpu(cpu) + if event is None: + done = True + break + + if not isinstance(event, perf.sample_event): + continue + + print(f"cpu: {event.sample_cpu:<3} pid: {event.sample_pid:<6} " + f"tid: {event.sample_tid:<6} ip: {hex(event.sample_ip):<20} " + f"period: {event.sample_period:<20}") + + evlist.close() + +if __name__ == '__main__': + main() -- 2.49.0