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Wed, 21 Oct 2026 08:55:06 -0700 (PDT) Received: from gmonaco-thinkpadt14gen3.rmtit.csb ([195.174.34.203]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a20398f37csm1981285e9.8.2026.10.21.08.55.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2026 08:55:05 -0700 (PDT) Message-ID: Subject: Re: [PATCH v2 10/15] tools/rv: Add BPF monitors From: Gabriele Monaco To: Nam Cao , John Ogness , Alexei Starovoitov , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, Steven Rostedt Cc: Wen Yang , Tobias Schaffner , Viktor Malik Date: Wed, 21 Oct 2026 17:55:03 +0200 In-Reply-To: <878q3rqpcy.fsf@yellow.woof> References: <20261001152042.124445-1-gmonaco@redhat.com> <20261001152042.124445-11-gmonaco@redhat.com> <878q3xtptq.fsf@jogness.linutronix.de> <8B3FF026-6159-48CF-8FEA-AF2FACD2E4EB@redhat.com> <87bj8s8ih9.fsf@jogness.linutronix.de> <871p9mqcn2.fsf@jogness.linutronix.de> <87ld7trgzg.fsf@yellow.woof> <87mrs9q1d3.fsf@jogness.linutronix.de> <87ecdjqxnr.fsf@yellow.woof> <631896ae8e44ed6356c3b79598a2facee8af9770.camel@redhat.com> <878q3rqpcy.fsf@yellow.woof> Autocrypt: addr=gmonaco@redhat.com; prefer-encrypt=mutual; keydata=mDMEZuK5YxYJKwYBBAHaRw8BAQdAmJ3dM9Sz6/Hodu33Qrf8QH2bNeNbOikqYtxWFLVm0 1a0JEdhYnJpZWxlIE1vbmFjbyA8Z21vbmFjb0BrZXJuZWwub3JnPoiZBBMWCgBBFiEEysoR+AuB3R Zwp6j270psSVh4TfIFAmjKX2MCGwMFCQWjmoAFCwkIBwICIgIGFQoJCAsCBBYCAwECHgcCF4AACgk Q70psSVh4TfIQuAD+JulczTN6l7oJjyroySU55Fbjdvo52xiYYlMjPG7dCTsBAMFI7dSL5zg98I+8 cXY1J7kyNsY6/dcipqBM4RMaxXsOtCRHYWJyaWVsZSBNb25hY28gPGdtb25hY29AcmVkaGF0LmNvb T6InAQTFgoARAIbAwUJBaOagAULCQgHAgIiAgYVCgkICwIEFgIDAQIeBwIXgBYhBMrKEfgLgd0WcK eo9u9KbElYeE3yBQJoymCyAhkBAAoJEO9KbElYeE3yjX4BAJ/ETNnlHn8OjZPT77xGmal9kbT1bC1 7DfrYVISWV2Y1AP9HdAMhWNAvtCtN2S1beYjNybuK6IzWYcFfeOV+OBWRDQ== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.2 (3.60.2-2.fc44) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 On Wed, 2026-10-21 at 13:12 +0200, Nam Cao wrote: > Gabriele Monaco writes: > > On Wed, 2026-10-21 at 10:13 +0200, Nam Cao wrote: > > > I wouldn't enable those by default though, it's way too much noises. = As > > > it's for debugging the model, we can have some sort of compile-time > > > switch to turn it on. > >=20 > > That's almost what's happening already, in-kernel use tracepoints, gate= d by > > static branches. Those are the closest thing you can get to a dynamic > > compile- > > time switch (assuming such a thing can exist), it's patching the code. >=20 > I was talking about how people are going to enable transition events, > not how kernel enables them. Do we expose some user API for people to > enable at run-time (and kernel can use run-time patching or whatever), > or people enable them while compiling their BPF programs. I think the > latter should suffice. Everything BPF-related will need to go through the userspace tool. From loa= ding monitors to enabling things, but it shouldn't require any recompilation. Right now I use only the -t flag (enable tracing and print to stdout), we'd= need some flag to only enable tracing. After that you should be able to use ftrace as normal. Gabriele