linux-kernel - Re: [PATCH 3/4] rtla/timerlat: Add example for BPF action program

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Message-ID: <17528ec0b9f6c8ff2492beea672d4b7950ef72af.camel@redhat.com>
Date: Mon, 27 Oct 2025 08:30:46 -0400
From: Crystal Wood <crwood@...hat.com>
To: Tomas Glozar <tglozar@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>, LKML
 <linux-kernel@...r.kernel.org>,  Linux Trace Kernel
 <linux-trace-kernel@...r.kernel.org>, John Kacur <jkacur@...hat.com>, Luis
 Goncalves	 <lgoncalv@...hat.com>, Costa Shulyupin <costa.shul@...hat.com>,
 Wander Lairson Costa <wander@...hat.com>, Arnaldo Carvalho de Melo
 <acme@...nel.org>
Subject: Re: [PATCH 3/4] rtla/timerlat: Add example for BPF action program

On Mon, 2025-10-27 at 11:34 +0100, Tomas Glozar wrote:
> pá 24. 10. 2025 v 3:49 odesílatel Crystal Wood <crwood@...hat.com> napsal:
> > 
> > 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.
> > 
> 
> 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