linux-kernel - Re: [PATCH 0/4] PM: tracing: Don't compile in unused trace events

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Message-ID: <CAJZ5v0iTrDBV7wG0gzpg3hzjBFWUdohquyVGta93uOhyoWpiLw@mail.gmail.com>
Date: Thu, 12 Jun 2025 20:46:48 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
	linux-pm@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, 
	Masami Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	"Rafael J. Wysocki" <rafael@...nel.org>, Viresh Kumar <viresh.kumar@...aro.org>, 
	Madhavan Srinivasan <maddy@...ux.ibm.com>, Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH 0/4] PM: tracing: Don't compile in unused trace events

On Thu, Jun 12, 2025 at 4:52 PM Steven Rostedt <rostedt@...dmis.org> wrote:
>
>
> I have code that makes unsued events trigger a warning. I'm currently cleaning
> up the kernel to remove the majority of events that are defined but not used.
> When an event is defined, it can take up to 5K of text and meta data per
> event. An event should not be created if it is not being used.
>
> The powernv_throttle event is only used by the powernv code so I moved it to
> its own header file and it gets created when the powernv code is compiled in.
>
> For the other power events, I just added #ifdef around them with the configs
> that enable them.
>
> Steven Rostedt (4):
>       PM: cpufreq: powernv/tracing: Move powernv_throttle trace event
>       PM: tracing: Hide psci_domain_idle events under ARM_PSCI_CPUIDLE
>       PM: tracing: Hide device_pm_callback events under PM_SLEEP
>       PM: tracing: Hide power_domain_target event under ARCH_OMAP2PLUS
>
> ----
>  drivers/cpufreq/Makefile          |  1 +
>  drivers/cpufreq/powernv-cpufreq.c |  4 +++-
>  drivers/cpufreq/powernv-trace.h   | 44 +++++++++++++++++++++++++++++++++++++++
>  include/trace/events/power.h      | 28 ++++++-------------------
>  kernel/trace/power-traces.c       |  1 -
>  5 files changed, 54 insertions(+), 24 deletions(-)
>  create mode 100644 drivers/cpufreq/powernv-trace.h

For the series:

Acked-by: Rafael J. Wysocki <rafael@...nel.org>

Thanks!