linux-kernel - Re: [PATCH 2/2] tracing, thermal: Hide cpu cooling trace events when not in use

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Date:   Tue, 17 Oct 2017 08:16:59 +0100
From:   Javi Merino <javi.merino@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Eduardo Valentin <edubezval@...il.com>
Subject: Re: [PATCH 2/2] tracing, thermal: Hide cpu cooling trace events when
 not in use

On Fri, Oct 13, 2017 at 10:23:09AM -0400, Steven Rostedt wrote:
> From: Steven Rostedt (VMware) <rostedt@...dmis.org>
> 
> As trace events when defined create data structures and functions to
> process them, defining trace events when not using them is a waste of
> memory.
> 
> The trace events thermal_power_cpu_get_power and
> thermal_power_cpu_limit are only used when CONFIG_CPU_THERMAL is set.
> Make those events only defined when that is set as well.
> 
> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

Acked-by: Javi Merino <javi.merino@...nel.org>

> ---
> Index: linux-trace.git/include/trace/events/thermal.h
> ===================================================================
> --- linux-trace.git.orig/include/trace/events/thermal.h
> +++ linux-trace.git/include/trace/events/thermal.h
> @@ -90,6 +90,7 @@ TRACE_EVENT(thermal_zone_trip,
>  		show_tzt_type(__entry->trip_type))
>  );
>  
> +#ifdef CONFIG_CPU_THERMAL
>  TRACE_EVENT(thermal_power_cpu_get_power,
>  	TP_PROTO(const struct cpumask *cpus, unsigned long freq, u32 *load,
>  		size_t load_len, u32 dynamic_power, u32 static_power),
> @@ -147,6 +148,7 @@ TRACE_EVENT(thermal_power_cpu_limit,
>  		__get_bitmask(cpumask), __entry->freq, __entry->cdev_state,
>  		__entry->power)
>  );
> +#endif /* CONFIG_CPU_THERMAL */
>  
>  #ifdef CONFIG_DEVFREQ_THERMAL
>  TRACE_EVENT(thermal_power_devfreq_get_power,