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Thu, 23 Oct 2025 18:49:04 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHkekBeKt/UBYBK9lMa4hj3CeOCtL78ldOAual+TkPrSzY56RttSscXLjrpnEwizYLA7MNPfQ== X-Received: by 2002:ad4:5c44:0:b0:839:112c:1332 with SMTP id 6a1803df08f44-87c206398e4mr381178896d6.55.1761270544218; Thu, 23 Oct 2025 18:49:04 -0700 (PDT) Received: from crwood-thinkpadp16vgen1.minnmso.csb ([2601:447:c680:2b50:ee6f:85c2:7e3e:ee98]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-87fb5681868sm4474386d6.52.2025.10.23.18.49.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Oct 2025 18:49:03 -0700 (PDT) Message-ID: 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: Thu, 23 Oct 2025 20:49:02 -0500 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> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2025-10-23 at 09:27 +0200, Tomas Glozar wrote: > =C3=BAt 21. 10. 2025 v 19:32 odes=C3=ADlatel Crystal Wood napsal: > >=20 > > On Tue, 2025-10-21 at 13:02 -0400, Steven Rostedt wrote: > > >=20 > > > Note, trace_array_printk() (which trace_array_init_printk()) only wor= ks for > > > instances and does not print into the top level trace buffer. > >=20 > > Yes, it's for instances, such as the ones rtla creates. > >=20 > > -Crystal > >=20 >=20 > Right, it actually works with the trace instance, when set up properly: [snip] > Saving trace to timerlat_trace.txt > timerlatu/0-47791 [000] ...22 863353.286497: bpf_trace_printk: > Latency: 21282 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. -Crystal