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Date: Mon, 16 Apr 2018 13:29:11 +0100 From: Sudeep Holla <sudeep.holla@....com> To: Viresh Kumar <viresh.kumar@...aro.org> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>, edubezval@...il.com, kevin.wangtao@...aro.org, leo.yan@...aro.org, vincent.guittot@...aro.org, linux-kernel@...r.kernel.org, javi.merino@...nel.org, rui.zhang@...el.com, daniel.thompson@...aro.org, linux-pm@...r.kernel.org, Amit Daniel Kachhap <amit.kachhap@...il.com> Subject: Re: [PATCH v3 6/7] thermal/drivers/cpu_cooling: Introduce the cpu idle cooling driver On Mon, Apr 16, 2018 at 03:20:06PM +0530, Viresh Kumar wrote: > On 16-04-18, 11:45, Daniel Lezcano wrote: > > Can you elaborate a bit ? I'm not sure to get the point. > > Sure. With your current code on Hikey960 (big/LITTLE), you end up > creating two cooling devices, one for the big cluster and one for > small cluster. Which is the right thing to do, as we also have two > cpufreq cooling devices. > > But with the change Sudeep is referring to, the helper you used to get > cluster id will return 0 (SoC id) for all the 8 CPUs. So your code > will end up creating a single cpuidle cooling device for all the CPUs. > Which would be wrong. > > > BTW, Am I asked to change my code to stick to something which is not > > merged ? > > Sudeep looked pretty confident on how the meaning of this routine is > going to change very soon. I will let him respond on what guarantees > we have that it will get merged :) > Viresh has already summarised it correctly. I don't have much to add. Unless the system has multiple package, this routine will return 0(or some fixed socket number, I don't think it can be different from 0 but theoretically it can be anything but has to be same for all the CPUs) -- Regards, Sudeep
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