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Tue, 5 Aug 2025 13:03:49 GMT Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 09BB820043; Tue, 5 Aug 2025 13:03:49 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0E10720040; Tue, 5 Aug 2025 13:03:48 +0000 (GMT) Received: from heavy.ibm.com (unknown [9.87.141.116]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 5 Aug 2025 13:03:47 +0000 (GMT) From: Ilya Leoshkevich To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Ian Rogers , Arnaldo Carvalho de Melo Cc: bpf@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, Thomas Richter , Jiri Olsa , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Ilya Leoshkevich Subject: [PATCH v3 0/2] perf/s390: Regression: Move uid filtering to BPF filters Date: Tue, 5 Aug 2025 14:54:03 +0200 Message-ID: <20250805130346.1225535-1-iii@linux.ibm.com> X-Mailer: git-send-email 2.50.1 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-ORIG-GUID: 2mhPOHiNl0xHmJCmIob5vO2gaWJfSdIm X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODA1MDA5NCBTYWx0ZWRfX8C6eF2tklVQF 9gHAjV6Si+3gX+LU0ziFB5jlUBCDnnW5sckOTEeTBPbcMf78GmGQp5EunxNKANBmYTbrJ7d+AzT nEVVuj3IEcNbg1U1lBUJLcm2hDyOqX4dEXuz/mB1fL7CfRNIChPZgIPLIIhIYgeOIXh49BL1diO ck+da6iucFJ4Vjjxp24g9H3yM+4HKoN3ya/psH9yTdJ6MyiWcU3MHGK4O8eNuccBiktnXRFORI3 J3uhWJ7dqDBj/zABAUdp24VX9d6evZxLQcD476yPLzHcmBFoIUNoGLmZR6sDeqCz9CuJhS/KlXh uVqXYPrHa8Qm7rnPRmnVUlgGVBgv+1uGStTDmIEGlXbNHjoqnAe6dghDO4cOXXXQzbdWeZDzYJF Yh23HS+r4ceFZQ0vPMjpVyPcF3QF8Fsez0vayl34PDIiDvIXn2pAjTHWO5rxo7bMVQHxWBx0 X-Authority-Analysis: v=2.4 cv=eLATjGp1 c=1 sm=1 tr=0 ts=6892013a cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=2OwXVqhp2XgA:10 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=8VANnnlgz3Se4JOSuVMA:9 X-Proofpoint-GUID: 8jYFBiaxUjIsYo2y0NaV6kDomtwC0ZIL 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=2025-08-05_03,2025-08-04_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 adultscore=0 clxscore=1015 malwarescore=0 suspectscore=0 mlxscore=0 spamscore=0 lowpriorityscore=0 impostorscore=0 priorityscore=1501 bulkscore=0 phishscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2508050094 v2: https://lore.kernel.org/bpf/20250728144340.711196-1-tmricht@linux.ibm.com/ v2 -> v3: Use no_ioctl_enable in perf. v1: https://lore.kernel.org/bpf/20250725093405.3629253-1-tmricht@linux.ibm.com/ v1 -> v2: Introduce no_ioctl_enable (Jiri). Hi, This series fixes a regression caused by moving UID filtering to BPF. The regression affects all events that support auxiliary data, most notably, "cycles" events on s390, but also PT events on Intel. The symptom is missing events when UID filtering is enabled. Patch 1 introduces a new option for the bpf_program__attach_perf_event_opts() function. Ppatch 2 makes use of it in perf, and also contains a lot of technical details of why exactly the prolblem is occurring. Thanks to Thomas Richter for the investigation and the initial version of this fix, and to Jiri Olsa for suggestions. Best regards, Ilya Ilya Leoshkevich (2): libbpf: Add the ability to suppress perf event enablement perf bpf-filter: Enable events manually tools/lib/bpf/libbpf.c | 13 ++++++++----- tools/lib/bpf/libbpf.h | 4 +++- tools/perf/util/bpf-filter.c | 5 ++++- 3 files changed, 15 insertions(+), 7 deletions(-) -- 2.50.1