linux-kernel - Re: [PATCH v2] cpufreq: Register with perf domain before

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Date:   Wed, 18 Jan 2023 14:19:23 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Vincent Wang <bhuwz@....com>
Cc:     rafael@...nel.org, lukasz.luba@....com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vincent Wang <vincentwang3@...ovo.com>
Subject: Re: [PATCH v2] cpufreq: Register with perf domain before

On 18-01-23, 12:47, Vincent Wang wrote:
> From: Vincent Wang <vincentwang3@...ovo.com>
> 
> We found the following issue during kernel boot on android phone:
> 
> [    1.325272][    T1] cpu cpu0: EM: created perf domain
> [    1.329317][    T1] cpu cpu4: EM: created perf domain
> [    1.337597][   T76] pd_init: no EM found for CPU7
> [    1.350849][    T1] cpu cpu7: EM: created perf domain
> 
> pd init for cluster2 is executed in a kworker thread and
> is earlier than the perf domain creation for cluster2.

Can you please give detail of the exact code path, for mainline kernel
? I am not sure which kworker thread are you talking about here.

> pd_init() is called from the cpufreq notification of
> CPUFREQ_CREATE_POLICY in cpufreq_online(), which is earlier
> than that cpufreq_driver->register_em() is called.

-- 
viresh