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Cc: Jan Polensky , Alexander Gordeev From: Thomas Richter Subject: [linux-next] perf report runtime extremely long Organization: IBM Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=DYkaa/tW c=1 sm=1 tr=0 ts=6901ca47 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=x6icFKpwvdMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=x4kxwI2lhZTCVj833_4A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: CR2gYEP0e08wFB8tmF9ersK2YTtA-XM3 X-Proofpoint-ORIG-GUID: CR2gYEP0e08wFB8tmF9ersK2YTtA-XM3 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDI4MDE2NiBTYWx0ZWRfX6LHQg/5H+wFo 08yelYdevauynl7ByDjNKkhKXqawPCth4ht9L3UK+/o7S1fB/1MYOM5XY9sNvorWsbBoINGrsJf 2eVoNvhjBe78y1BJ/Y/5wMbPogJQ5UddRdQtp6HgIZClzwXJsARpeRkfuf8oIM7HmOuMzze8dlW 2jQ2xVIO2LBb9Xx3FGzLRi8cvRG7KmfEqect6/uTZ87k/25glzKsNG/GlgZ/qX1kMpGVqQXThfn 9Iuxve/tYsH4zAxmksADyTuy95lWrYDelnQp9EvBwdAyST6hF6EIpJUkgUh59Gqk85VEmhuGGyM 98wNau8JGV++5sqaS4ppHOIr/qzNFToaO2mtaoeyFtKRJhXtq2k0EnsaiM9Yg4gEPiISkO0Cc9e Cboob+j+sU84jHiKsFePLIRL9/MIbg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-29_03,2025-10-22_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 malwarescore=0 bulkscore=0 impostorscore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 phishscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2510280166 Hi all, has something changed recently in perf report in linux-next repo? I run perf report -i -D | grep something on s390 with 2 different kernels: master 6.18.0rc3: # uname -a Linux a35lp67.lnxne.boe 6.18.0-rc3m-perf+ #23 SMP Tue Oct 28 15:53:44 CET 2025 s390x GNU/Linux # ll /tmp/perf2-eSso2q-2 -rw------- 1 root root 8538184 Oct 29 08:44 /tmp/perf2-eSso2q-2 # time perf report -i/tmp/perf2-eSso2q-2 -D | grep Counter:000 > /dev/null real 0m22.262s user 0m22.068s sys 0m0.200s # This runtime is ok for the perf.data file size. linux-next: # uname -a Linux s83lp47.lnxne.boe 6.18.0-20251028.rc3.git141.f7d2388eeec2.63.fc42.s390x+next #1 SMP Tue Oct 28 20:06:13 CET 2025 s390x GNU/Linux #ll /tmp/perf2-eSso2q-2 -rw-------. 1 root root 8538184 Oct 29 08:47 /tmp/perf2-eSso2q-2 # time perf report -i/tmp/perf2-eSso2q-2 -D | grep Counter:000 > /dev/null real 2m53.601s user 2m52.938s sys 0m0.575s # Same perf.data file and run time increased from 22 seconds to nearly 300 seconds, roughly 14 times longer for the same input! Has anybody similar observations? Thanks a lot -- 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