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Fri, 13 Mar 2026 13:13:18 +0000 (GMT) Message-ID: <66d0366b-8690-4bde-aba4-1d51f278dfa1@linux.ibm.com> Date: Fri, 13 Mar 2026 14:13:18 +0100 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: Ian Rogers Cc: "linux-perf-use." , Jan Polensky From: Thomas Richter Subject: perf stat issue with 7.0.0rc3 Organization: IBM Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: xsGvHfDOcHq3ziSgiSxoIrt8gA5PZfgF X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzEzMDEwMyBTYWx0ZWRfX5+Vjaady2irb A+7cKV6171P4qfRag8eXnb7dFWrvm4N7KtArVamt9P8X7eOaoiYH/DEkMr6/yxYgK/3Pe+RZzZK grJf69ua0eWqJdyTvm9wSuxHCv6zs8LydKTvwCaQH6D0VXL6OpKUUDpIWL95CPihgkSdRo3Y8Yk gDx4BJj3Eq4J3MRzOVfmuiMmvmEpkZVM4BOmWiYCqWfDGzpY8fgtOxUJ7OWEUq53CTheO68s3R3 UDFWs+QvVvXLt/cXfLDfcxnJu+f/fQW5LX+XHwI0/ixgBVmnPZ/fKme44WH/f99X58j62ZHTTAp WWUnHHXWCjN8A/dHQSsTzH4fAvt/cNfA9XHGXd+Uitv/W3ZfB/oUvfzWeqoBWchAh+vUU4iT8VE Nb4Cm5AdM60eflH4es81YM3xfLsrZwjG4MD/kwriXZqJnQdoRdBPMoYIPBTQzJxk6JyFU8WU7vY StWwNeXFafaPLErM/YA== X-Proofpoint-GUID: 4nqGV01Fx19qtclMJk378pTQXS38orH_ X-Authority-Analysis: v=2.4 cv=XNk9iAhE c=1 sm=1 tr=0 ts=69b40d74 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=x4kxwI2lhZTCVj833_4A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-13_02,2026-03-13_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 adultscore=0 bulkscore=0 phishscore=0 priorityscore=1501 impostorscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603130103 Ian, I just discovered a strange behavior on linux 7.0.0rc3. I run these commands on my x86 virtual machine: bash-5.3# uname -m x86_64 bash-5.3# perf -v perf version 6.18.13-200.fc43.x86_64 bash-5.3# perf stat -- true Performance counter stats for 'true': 1.108.929 task-clock # 0,437 CPUs utilized 0 context-switches # 0,000 /sec 0 cpu-migrations # 0,000 /sec 55 page-faults # 49,597 K/sec cycles 0,002536439 seconds time elapsed 0,001363000 seconds user 0,001393000 seconds sys bash-5.3# This is the epected output, however when I use the perf version 7.0.0rc3: bash-5.3# ./perf -v perf version 7.0.rc3.g1f318b96cc84 bash-5.3# ./perf stat -- true Error: No supported events found. trace.args_alignment bash-5.3# Same happens on my s390 systems (LPAR and z/VM). Is this a known already? I guess this is a perf tool issue, same result when you execute this on a 7.0.0rc3 kernel. Any ideas where to start debugging -- Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany -- IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Wolfgang Wendt Geschäftsführung: David Faller Sitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart, HRB 243294