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

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Message-ID: <CAP4=nvT8VGpYrqQDztmB1WJPEb6JXvUuL201ksWq6eSV7kn-oA@mail.gmail.com>
Date: Tue, 21 Oct 2025 16:54:57 +0200
From: Tomas Glozar <tglozar@...hat.com>
To: Crystal Wood <crwood@...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

po 20. 10. 2025 v 19:53 odesílatel Crystal Wood <crwood@...hat.com> napsal:
>
> We should have the makefile build this, and add a test that uses it.
>

I agree. I tried to use the example, but it would be also good to
check if the BPF program was actually executed.

That is hard to do reliably for the current example, as it writes into
the global tracefs instance, which might conflict with another user of
the same instance. I will write another BPF program that will create a
map instead, and a script that will check the map value via
--on-threshold in the test.

Tomas