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From: Viresh Kumar <viresh.kumar@linaro.org>
To: Ionela Voinescu <ionela.voinescu@arm.com>
Cc: linux-pm@vger.kernel.org, peterz@infradead.org,
	catalin.marinas@arm.com, rjw@rjwysocki.net,
	linux@armlinux.org.uk, linux-kernel@vger.kernel.org,
	mingo@redhat.com, sudeep.holla@arm.com, will@kernel.org,
	dietmar.eggemann@arm.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 3/7] arch_topology: disable frequency invariance for CONFIG_BL_SWITCHER
Date: Thu, 30 Jul 2020 09:54:23 +0530
Message-ID: <20200730042423.4j22udejluis7blw@vireshk-mac-ubuntu> (raw)
In-Reply-To: <20200722093732.14297-4-ionela.voinescu@arm.com>

On 22-07-20, 10:37, Ionela Voinescu wrote:
> +++ b/drivers/base/arch_topology.c
> @@ -27,6 +27,7 @@ __weak bool arch_freq_counters_available(struct cpumask *cpus)
>  }
>  DEFINE_PER_CPU(unsigned long, freq_scale) = SCHED_CAPACITY_SCALE;
>  
> +#ifndef CONFIG_BL_SWITCHER
>  void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
>  			 unsigned long max_freq)
>  {
> @@ -46,6 +47,7 @@ void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
>  	for_each_cpu(i, cpus)
>  		per_cpu(freq_scale, i) = scale;
>  }
> +#endif

I don't really like this change, the ifdef hackery is disgusting and
then we are putting that in a completely different part of the kernel.

There are at least these two ways of solving this, maybe more:

- Fix the bl switcher driver and add the complexity in it (which you
  tried to do earlier).

- Add a cpufreq flag to skip arch-set-freq-scale call.

Rafael ?

-- 
viresh

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Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-22  9:37 [PATCH v2 0/7] cpufreq: improve frequency invariance support Ionela Voinescu
2020-07-22  9:37 ` [PATCH v2 1/7] cpufreq: move invariance setter calls in cpufreq core Ionela Voinescu
2020-07-27 13:48   ` Rafael J. Wysocki
2020-07-29  9:03     ` Ionela Voinescu
2020-07-30  3:41     ` Viresh Kumar
2020-08-03 13:26       ` Ionela Voinescu
2020-08-03 13:46         ` Rafael J. Wysocki
2020-08-03 14:16           ` Ionela Voinescu
2020-07-22  9:37 ` [PATCH v2 2/7] cpufreq: set invariance scale factor on transition end Ionela Voinescu
2020-07-27 13:52   ` Rafael J. Wysocki
2020-07-29  9:14     ` Ionela Voinescu
2020-07-30  4:13   ` Viresh Kumar
2020-08-03 13:58     ` Ionela Voinescu
2020-08-04  6:26       ` Viresh Kumar
2020-08-05 10:35         ` Ionela Voinescu
2020-07-22  9:37 ` [PATCH v2 3/7] arch_topology: disable frequency invariance for CONFIG_BL_SWITCHER Ionela Voinescu
2020-07-30  4:24   ` Viresh Kumar [this message]
2020-07-30 10:29     ` Dietmar Eggemann
2020-07-31 15:48       ` Sudeep Holla
2020-08-03 14:39         ` Ionela Voinescu
2020-08-04  6:30       ` Viresh Kumar
2020-08-10  9:01         ` Ionela Voinescu
2020-07-22  9:37 ` [PATCH v2 4/7] cpufreq: report whether cpufreq supports Frequency Invariance (FI) Ionela Voinescu
2020-07-27 14:02   ` Rafael J. Wysocki
2020-07-29 14:39     ` Ionela Voinescu
2020-07-30  4:43   ` Viresh Kumar
2020-08-03 15:24     ` Ionela Voinescu
2020-08-04  6:46       ` Viresh Kumar
2020-08-05 10:35         ` Ionela Voinescu
2020-07-22  9:37 ` [PATCH v2 5/7] arch_topology, cpufreq, sched/core: constify arch_* cpumasks Ionela Voinescu
2020-07-30 11:43   ` Catalin Marinas
2020-07-22  9:37 ` [PATCH v2 6/7] arch_topology, arm, arm64: define arch_scale_freq_invariant() Ionela Voinescu
2020-07-30 11:44   ` [PATCH v2 6/7] arch_topology,arm,arm64: " Catalin Marinas
2020-07-22  9:37 ` [PATCH v2 7/7] cpufreq: make schedutil the default for arm and arm64 Ionela Voinescu
2020-07-30  4:54   ` Viresh Kumar

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