linux-kernel - Re: [PATCH 4/5] cpufreq: create cpu/cpufreq/policyX directories

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Date:	Thu, 15 Oct 2015 12:28:10 -0700
From:	Saravana Kannan <skannan@...eaurora.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	Rafael Wysocki <rjw@...ysocki.net>, linaro-kernel@...ts.linaro.org,
	linux-pm@...r.kernel.org, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] cpufreq: create cpu/cpufreq/policyX directories

On 10/14/2015 11:55 PM, Viresh Kumar wrote:
> On 13-10-15, 12:29, Saravana Kannan wrote:
>> But we don't need to track track of "present-cpus" separately
>> though. We could do the for_each_cpu_and() when we create the
>> symlinks for the first time. And after that, we can just use the
>> subsystem interface callbacks (cpufreq_add_dev() and
>> cpufreq_remove_dev()) to keep the symlinks updated.
>>
>> I don't see any place where keeping track of this separately is more
>> efficient. This would save some memory savings when the number of
>> CPUs is large and also simplify the code because we won't have to
>> keep another field up to date.
>
> It is still required to track when can we free the policy.
>

Ok, I'm not very familiar with this new field's uses. I'll take a closer 
look later and respond if I have other thoughts.

Thanks,
Saravana

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