linux-kernel - Re: [PATCH v2] cpufreq: Don't destroy/realloc policy/sysfs on hotplug/suspend

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Message-ID: <CAKohpon8zDP3hVFMQV4CO2zOkb-AwnDws8xW=H8Hm4=gW=8FGQ@mail.gmail.com>
Date:	Wed, 16 Jul 2014 11:14:01 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Srivatsa S. Bhat" <srivatsa@....edu>
Cc:	Saravana Kannan <skannan@...eaurora.org>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Todd Poynor <toddpoynor@...gle.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH v2] cpufreq: Don't destroy/realloc policy/sysfs on hotplug/suspend

On 15 July 2014 12:28, Srivatsa S. Bhat <srivatsa@....edu> wrote:
> Wait, allowing an offline CPU to be the policy->cpu (i.e., the CPU which is
> considered as the master of the policy/group) is just absurd.

Yeah, that was as Absurd as I am :)

> The goal of this patchset should be to just de-couple the sysfs files/ownership
> from the policy->cpu to an extent where it doesn't matter who owns those
> files, and probably make it easier to do CPU hotplug without having to
> destroy and recreate the files on every hotplug operation.

I went to that Absurd idea because we thought we can skip playing with
the sysfs nodes on suspend/hotplug.

And if policy->cpu keeps changing with hotplug, we *may* have to keep
sysfs stuff moving as well. One way to avoid that is by using something
like: policy->sysfs_cpu, but wasn't sure if that's the right path to follow.

Lets see what Saravana's new patchset has for us :)
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