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Tue, 21 Oct 2025 10:32:04 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHJnTDhJjNQ1qpexZXHyE5h/wTUDGSCb6wrNmM2suFXRMcNKfVQbc8YiNqvmKsKuM3t83MyBw== X-Received: by 2002:a05:620a:319f:b0:891:c248:a513 with SMTP id af79cd13be357-891c248a792mr1509677585a.66.1761067923717; Tue, 21 Oct 2025 10:32:03 -0700 (PDT) Received: from crwood-thinkpadp16vgen1.minnmso.csb ([2601:447:c680:2b50:ee6f:85c2:7e3e:ee98]) by smtp.gmail.com with ESMTPSA id af79cd13be357-891cc8d5d8bsm804157285a.8.2025.10.21.10.32.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Oct 2025 10:32:03 -0700 (PDT) Message-ID: <321181e1e5060f0c68e0430d69e0e89688b08235.camel@redhat.com> Subject: Re: [PATCH 3/4] rtla/timerlat: Add example for BPF action program From: Crystal Wood To: Steven Rostedt Cc: Tomas Glozar , LKML , Linux Trace Kernel , John Kacur , Luis Goncalves , Costa Shulyupin , Wander Lairson Costa , Arnaldo Carvalho de Melo Date: Tue, 21 Oct 2025 12:32:01 -0500 In-Reply-To: <20251021130232.2ca75863@gandalf.local.home> References: <20251017144650.663238-1-tglozar@redhat.com> <20251017144650.663238-4-tglozar@redhat.com> <20251021130232.2ca75863@gandalf.local.home> 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 Tue, 2025-10-21 at 13:02 -0400, Steven Rostedt wrote: > On Tue, 21 Oct 2025 10:58:06 -0500 > Crystal Wood wrote: >=20 > > Huh, so I guess BPF is an exception to the "no generic printk to the > > global trace instance except for debugging that generates a big boot > > splat" rule? >=20 > bpf_printk() is an event and not the generic trace_printk() that would > cause that splat. You can turn it off. Ah, I see. > > Speaking of which, why doesn't trace_osnoise.c call > > trace_array_init_printk() given that it uses trace_array_printk_buf()? >=20 > Note, trace_array_printk() (which trace_array_init_printk()) only works f= or > instances and does not print into the top level trace buffer. Yes, it's for instances, such as the ones rtla creates. -Crystal