From: Gabriele Monaco <gmonaco@redhat.com>
To: John Ogness <john.ogness@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>
Cc: Nam Cao <namcao@linutronix.de>, Tomas Glozar <tglozar@redhat.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
bpf@vger.kernel.org, Wen Yang <wen.yang@linux.dev>,
Tobias Schaffner <tobias.schaffner@siemens.com>,
Viktor Malik <vmalik@redhat.com>
Subject: Re: [PATCH v2 10/15] tools/rv: Add BPF monitors
Date: Thu, 22 Oct 2026 13:34:18 +0200 [thread overview]
Message-ID: <382ed6c3bf6ab5f2c31ab9c9becae1b4f53c15de.camel@redhat.com> (raw)
In-Reply-To: <e778bbd7d5e2d2fc07ee365f37db59af04d9a36f.camel@redhat.com>
On Thu, 2026-10-22 at 12:09 +0200, Gabriele Monaco wrote:
> Exporting all handlers functions is probably going to require a significant
> redesign of the current RV internals.
> Handlers have access to the monitor headers (everything is static/inlined),
> kfuncs wouldn't.
I gave it some more thought, while you could generalise the DA monitor
definition structure (imposing size limits and taking up that space anyway or
doing some /smart/ things the BPF verifier probably wouldn't enjoy) then pass
that to the handlers, I cannot think how to have a kfunc call the LTL functions
defined in BPF. You'd probably need a helper macro that is essentially doing
what the "shared" functions do now.
I could fire up an LLM and get some /original/ ways to work around that, but all
I can think of is essentially rewriting RV from scratch.
Again, the easiest thing to do is kfunc only what goes out (tracepoints and
eventually reactors) and keep the rest in BPF.
Gabriele
next prev parent reply other threads:[~2026-10-22 11:34 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-01 15:20 [PATCH v2 00/15] rv: Add support for " Gabriele Monaco
2026-10-01 15:20 ` [PATCH v2 01/15] sched: Add task enqueue/dequeue trace points Gabriele Monaco
2026-10-01 15:49 ` Peter Zijlstra
2026-10-02 7:09 ` Gabriele Monaco
2026-10-02 10:29 ` Peter Zijlstra
2026-10-02 11:55 ` Gabriele Monaco
2026-10-02 19:18 ` Peter Zijlstra
2026-10-02 19:40 ` Gabriele Monaco
2026-10-04 7:57 ` Steven Rostedt
2026-10-12 11:54 ` Peter Zijlstra
2026-10-04 7:45 ` Steven Rostedt
2026-10-12 11:49 ` Peter Zijlstra
2026-10-02 0:42 ` bot+bpf-ci
2026-10-01 15:20 ` [PATCH v2 02/15] tools/rv: Skip empty pid error in selftest if command failed Gabriele Monaco
2026-10-02 0:42 ` bot+bpf-ci
2026-10-01 15:20 ` [PATCH v2 03/15] rv: Refactor da_trace() functions to get strings internally Gabriele Monaco
2026-10-01 15:20 ` [PATCH v2 04/15] rv: Cast result of model_get_*_name() Gabriele Monaco
2026-10-13 6:14 ` Nam Cao
2026-10-13 8:15 ` Gabriele Monaco
2026-10-14 9:52 ` Gabriele Monaco
2026-10-14 10:02 ` Nam Cao
2026-10-01 15:20 ` [PATCH v2 05/15] tools/rv: Move argument parsing from in_kernel to utils Gabriele Monaco
2026-10-02 0:25 ` bot+bpf-ci
2026-10-01 15:20 ` [PATCH v2 06/15] tools/build: Add a feature test for bpftool-btf Gabriele Monaco
2026-10-01 15:20 ` [PATCH v2 07/15] tools/rv: Implement BPF monitor discovery and listing Gabriele Monaco
2026-10-02 0:42 ` bot+bpf-ci
2026-10-01 15:20 ` [PATCH v2 08/15] tools/rv: Implement BPF monitor loading and tracing Gabriele Monaco
2026-10-02 0:43 ` bot+bpf-ci
2026-10-01 15:20 ` [PATCH v2 09/15] tools/rv: Copy stripped bpf_atomic.h from libarena Gabriele Monaco
2026-10-02 0:42 ` bot+bpf-ci
2026-10-07 12:59 ` Nam Cao
2026-10-08 9:00 ` Gabriele Monaco
2026-10-08 11:16 ` Nam Cao
2026-10-09 10:09 ` Gabriele Monaco
2026-10-11 0:43 ` Steven Rostedt
2026-10-12 7:43 ` Gabriele Monaco
2026-10-01 15:20 ` [PATCH v2 10/15] tools/rv: Add BPF monitors Gabriele Monaco
2026-10-02 0:43 ` bot+bpf-ci
2026-10-06 13:29 ` Alexei Starovoitov
2026-10-08 9:54 ` Gabriele Monaco
2026-10-16 18:32 ` Alexei Starovoitov
2026-10-16 19:20 ` John Ogness
2026-10-17 10:42 ` Gabriele Monaco
2026-10-17 15:17 ` John Ogness
2026-10-17 16:09 ` Alexei Starovoitov
2026-10-17 16:56 ` John Ogness
2026-10-17 23:25 ` Alexei Starovoitov
2026-10-18 12:10 ` John Ogness
2026-10-19 9:05 ` Gabriele Monaco
2026-10-19 9:27 ` John Ogness
2026-10-19 9:46 ` Tomas Glozar
2026-10-19 13:16 ` Steven Rostedt
2026-10-19 10:01 ` Tomas Glozar
2026-10-19 10:43 ` Gabriele Monaco
2026-10-19 11:05 ` Tomas Glozar
2026-10-19 12:47 ` Gabriele Monaco
2026-10-19 13:05 ` Tomas Glozar
2026-10-21 7:26 ` Nam Cao
2026-10-19 13:02 ` John Ogness
2026-10-20 7:29 ` Gabriele Monaco
2026-10-21 8:01 ` Nam Cao
2026-10-21 11:54 ` Gabriele Monaco
2026-10-21 13:48 ` Steven Rostedt
2026-10-21 15:24 ` Gabriele Monaco
2026-10-21 16:47 ` John Ogness
2026-10-22 6:46 ` Gabriele Monaco
2026-10-22 8:15 ` John Ogness
2026-10-22 10:09 ` Gabriele Monaco
2026-10-22 11:34 ` Gabriele Monaco [this message]
2026-10-22 8:25 ` Nam Cao
2026-10-19 8:33 ` Gabriele Monaco
2026-10-19 9:10 ` John Ogness
2026-10-19 10:48 ` Gabriele Monaco
2026-10-19 12:51 ` Nam Cao
2026-10-19 13:14 ` John Ogness
2026-10-21 8:13 ` Nam Cao
2026-10-21 8:46 ` Gabriele Monaco
2026-10-21 11:12 ` Nam Cao
2026-10-21 15:55 ` Gabriele Monaco
2026-10-17 10:48 ` Gabriele Monaco
2026-10-01 15:20 ` [PATCH v2 11/15] tools/rv: Define CONFIG_X86_64 statically for " Gabriele Monaco
2026-10-01 15:20 ` [PATCH v2 12/15] tools/rv: Add reactors support to " Gabriele Monaco
2026-10-02 0:43 ` bot+bpf-ci
2026-10-01 15:20 ` [PATCH v2 13/15] verification/rvgen: Add support for " Gabriele Monaco
2026-10-02 0:25 ` bot+bpf-ci
2026-10-01 15:20 ` [PATCH v2 14/15] tools/rv: Add selftest for rv bpf monitors Gabriele Monaco
2026-10-02 0:43 ` bot+bpf-ci
2026-10-01 15:20 ` [PATCH v2 15/15] verification/rvgen: Add selftest for rvgen -b Gabriele Monaco
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