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

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Message-ID: <20190826112406.GR2369@hirez.programming.kicks-ass.net>
Date:   Mon, 26 Aug 2019 13:24:06 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dietmar Eggemann <dietmar.eggemann@....com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Douglas RAILLARD <douglas.raillard@....com>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        viresh.kumar@...aro.org, mingo@...hat.com
Subject: Re: [PATCH] sched/cpufreq: Align trace event behavior of fast
 switching

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.