From: Peter Zijlstra <peterz@infradead.org>
To: Vincent Donnefort <vincent.donnefort@arm.com>
Cc: rjw@rjwysocki.net, viresh.kumar@linaro.org,
vincent.guittot@linaro.org, qperret@google.com,
linux-kernel@vger.kernel.org, ionela.voinescu@arm.com,
lukasz.luba@arm.com, dietmar.eggemann@arm.com
Subject: Re: [PATCH v2 3/3] PM / EM: Skip inefficient OPPs
Date: Tue, 25 May 2021 10:48:23 +0200 [thread overview]
Message-ID: <YKy516IKPfsZj3cY@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <1621616064-340235-4-git-send-email-vincent.donnefort@arm.com>
On Fri, May 21, 2021 at 05:54:24PM +0100, Vincent Donnefort wrote:
> diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
> index 4f09afd..5a91a2b 100644
> --- a/kernel/sched/cpufreq_schedutil.c
> +++ b/kernel/sched/cpufreq_schedutil.c
> @@ -10,6 +10,7 @@
>
> #include "sched.h"
>
> +#include <linux/energy_model.h>
> #include <linux/sched/cpufreq.h>
> #include <trace/events/power.h>
>
> @@ -153,6 +154,9 @@ static unsigned int get_next_freq(struct sugov_policy *sg_policy,
>
> freq = map_util_freq(util, freq, max);
>
> + /* Avoid inefficient performance states */
> + freq = em_pd_get_efficient_freq(em_cpu_get(policy->cpu), freq);
> +
> if (freq == sg_policy->cached_raw_freq && !sg_policy->need_freq_update)
> return sg_policy->next_freq;
>
This seems somewhat unfortunate, it adds a loop over the OPPs only to
then call into cpufreq to do the exact same thing again :/
next prev parent reply other threads:[~2021-05-25 8:49 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-21 16:54 [PATCH v2 0/3] EM / PM: Inefficient OPPs Vincent Donnefort
2021-05-21 16:54 ` [PATCH v2 1/3] PM / EM: Fix inefficient state detection Vincent Donnefort
2021-05-24 12:41 ` Lukasz Luba
2021-05-25 9:50 ` Quentin Perret
2021-05-21 16:54 ` [PATCH v2 2/3] PM / EM: Extend em_perf_domain with a flag field Vincent Donnefort
2021-05-24 12:44 ` Lukasz Luba
2021-05-25 9:54 ` Quentin Perret
2021-05-21 16:54 ` [PATCH v2 3/3] PM / EM: Skip inefficient OPPs Vincent Donnefort
2021-05-24 12:55 ` Lukasz Luba
2021-05-25 8:48 ` Peter Zijlstra [this message]
2021-05-25 9:21 ` Vincent Donnefort
2021-05-25 10:00 ` Vincent Donnefort
2021-05-28 5:09 ` Viresh Kumar
2021-06-01 8:47 ` Vincent Donnefort
2021-06-01 8:56 ` Viresh Kumar
2021-06-01 9:07 ` Quentin Perret
2021-06-01 9:13 ` Viresh Kumar
2021-05-25 9:33 ` Quentin Perret
2021-05-25 9:46 ` Vincent Donnefort
2021-05-25 11:03 ` Lukasz Luba
2021-05-25 13:06 ` Quentin Perret
2021-05-25 13:34 ` Lukasz Luba
2021-05-25 9:47 ` Vincent Donnefort
2021-05-28 5:04 ` Viresh Kumar
2021-05-28 9:00 ` Lukasz Luba
2021-05-26 3:47 ` [PATCH v2 0/3] EM / PM: Inefficient OPPs Viresh Kumar
2021-05-26 8:56 ` Lukasz Luba
2021-05-26 9:33 ` Viresh Kumar
2021-05-27 7:13 ` Lukasz Luba
2021-05-26 9:01 ` Vincent Donnefort
2021-05-26 9:38 ` Viresh Kumar
2021-05-26 9:39 ` Viresh Kumar
2021-05-26 10:24 ` Lukasz Luba
2021-05-26 10:39 ` Lukasz Luba
2021-05-26 11:50 ` Lukasz Luba
2021-05-26 13:49 ` Vincent Donnefort
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