linux-kernel - Re: [PATCH V2] Cpufreq: Make governor data on nonboot cpus across system suspend/resume

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Date:	Fri, 22 Nov 2013 16:19:23 +0800
From:	Lan Tianyu <tianyu.lan@...el.com>
To:	viresh kumar <viresh.kumar@...aro.org>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nishanth Menon <nm@...com>
Subject: Re: [PATCH V2] Cpufreq: Make governor data on nonboot cpus across
 system suspend/resume

On 2013年11月22日 15:49, viresh kumar wrote:
> On Sunday 17 November 2013 09:43 AM, viresh kumar wrote:
>> On 16 November 2013 21:06, Lan Tianyu <tianyu.lan@...el.com> wrote:
> 
>> But I don't really like the solution here. You are handling frozen for EXIT in
>> cpufreq-core and for INIT in governor. That doesn't look like the right
>> approach. There are out of tree governors too (I know we don't care about them
>> :)), and those also need to adapt with some policy made at cpufreq-core level.
>>
>> I told you that I had another solution for this problem, pretty similar to
>> yours. It looked like this:
> 
> Hi Lan,
> 

Hi Viresh:

> There is some confusion going on here :)
> 

I think you also are in the Cc list and replied the mail.:)
https://lkml.org/lkml/2013/11/21/273

> There were few problems in the approach in your patch, which I have mentioned
> above, and Rafael agreed to them..

I only saw the out-of-tree governor issue your mentioned but where they
are? How upstream kernel cares them?

> 
>> But after the PM notifiers patch I even don't want this to go.. I will make sure
>> that that patch goes in, in one form or another :)
> 
> And I was still trying to get a better solution in place of these changes. And
> was going on the suggestions you gave about calling cpufreq callbacks from
> dpm_{suspend|resume}_noirq() calls.. And I am on my way to get things fixed that
> way. And so we don't actually need this patch anymore (I just saw that you have
> sent another version of it, probably because Rafael asked? Don't know what
> happened there :))..
> 
> So, I will try to get something working soon for you and Nishanth..
> 

-- 
Best regards
Tianyu Lan
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