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[50.74.19.99]) by smtp.gmail.com with ESMTPSA id af79cd13be357-89f24dd5ad9sm595808485a.22.2025.10.27.05.30.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Oct 2025 05:30:47 -0700 (PDT) Message-ID: <17528ec0b9f6c8ff2492beea672d4b7950ef72af.camel@redhat.com> Subject: Re: [PATCH 3/4] rtla/timerlat: Add example for BPF action program From: Crystal Wood To: Tomas Glozar Cc: Steven Rostedt , LKML , Linux Trace Kernel , John Kacur , Luis Goncalves , Costa Shulyupin , Wander Lairson Costa , Arnaldo Carvalho de Melo Date: Mon, 27 Oct 2025 08:30:46 -0400 In-Reply-To: References: <20251017144650.663238-1-tglozar@redhat.com> <20251017144650.663238-4-tglozar@redhat.com> <20251021130232.2ca75863@gandalf.local.home> <321181e1e5060f0c68e0430d69e0e89688b08235.camel@redhat.com> User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: VVbyuNoTTQSCdg-Ygr-cj7spgQ_wjIvSSjUZigZdaVo_1761568252 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2025-10-27 at 11:34 +0100, Tomas Glozar wrote: > p=C3=A1 24. 10. 2025 v 3:49 odes=C3=ADlatel Crystal Wood napsal: > >=20 > > OK, but as far as I can tell there's no way to get the non-BPF "stop > > tracing hit" messages without adding a call to trace_array_init_printk(= ) > > into trace_osnoise.c. > >=20 >=20 > I'm not sure what you mean. The --bpf-action functionality is > exclusive for BPF mode, bpf_trace_printk() / bpf_printk(), as Steven > clarified, is a BPF helper that triggers a trace event, defined in > kernel/trace/bpf_trace.c and kernel/trace/bpf_trace.h. This was from a tangential comment, not about --bpf-action. -Crystal