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Mon, 17 Feb 2025 11:49:20 +0000 (GMT) Date: Mon, 17 Feb 2025 12:49:18 +0100 From: Heiko Carstens To: Steven Rostedt , Masami Hiramatsu Cc: Linus Torvalds , LKML , Mark Rutland , Mathieu Desnoyers , Sven Schnelle , Vasily Gorbik , Alexander Gordeev Subject: Re: [GIT PULL] ftrace: Updates for v6.14 Message-ID: <20250217114918.10397-A-hca@linux.ibm.com> References: <20250119193134.0ebd56bc@gandalf.local.home> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250119193134.0ebd56bc@gandalf.local.home> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: -rxccJEI6JG-gvtXzl07rIx4QZx6uwgH X-Proofpoint-GUID: -rxccJEI6JG-gvtXzl07rIx4QZx6uwgH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-17_05,2025-02-13_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 mlxlogscore=774 suspectscore=0 phishscore=0 impostorscore=0 bulkscore=0 spamscore=0 mlxscore=0 adultscore=0 lowpriorityscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2501170000 definitions=main-2502170101 Hi Steven, Masami, On Sun, Jan 19, 2025 at 07:31:34PM -0500, Steven Rostedt wrote: > ftrace updates for v6.14: > > - Have fprobes built on top of function graph infrastructure this seems to cause a regression: When I run tools/testing/selftests/ftrace/ftracetest I now end up with all functions being enabled for ftrace after the test suite ran: $ wc -l /sys/kernel/debug/tracing/enabled_functions 50779 /sys/kernel/debug/tracing/enabled_functions $ cat /sys/kernel/debug/tracing/enabled_functions ... down (1) down_interruptible (1) down_killable (1) $ cat /sys/kernel/debug/tracing/current_tracer nop Bisected to commit 4346ba160409 ("fprobe: Rewrite fprobe on function-graph tracer"). Before this commit there were no ftrace enabled functions after the test suite finished: $ wc -l /sys/kernel/debug/tracing/enabled_functions 0 /sys/kernel/debug/tracing/enabled_functions This is on s390 with defconfig.