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

From: Dietmar Eggemann
Date: Mon Aug 26 2019 - 08:13:01 EST

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.