Re: [PATCH] sched/cpufreq: Align trace event behavior of fast switching

[Dietmar Eggemann]

On 26/08/2019 13:24, Peter Zijlstra wrote:
> On Mon, Aug 26, 2019 at 11:51:17AM +0200, Dietmar Eggemann wrote:
> 
>> Not sure about the extra  'if trace_cpu_frequency_enabled()' but I guess
>> it doesn't hurt.
> 
> Without that you do that for_each_cpu() iteration unconditionally, even
> if the tracepoint is disabled.

Makes sense, I'm wondering if we want this in
cpufreq_notify_transition() CPUFREQ_POSTCHANGE for the
non-fast-switching drivers as well.