linux-kernel - Re: [PATCH v2] thermal: add sysfs

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Date:	Wed, 30 Mar 2016 15:45:35 +0000
From:	"Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>
To:	"edubezval@...il.com" <edubezval@...il.com>,
	"srikars@...dia.com" <srikars@...dia.com>
CC:	"Zhang, Rui" <rui.zhang@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"mlongnecker@...dia.com" <mlongnecker@...dia.com>
Subject: Re: [PATCH v2] thermal: add sysfs_notify on some attributes

On Tue, 2016-03-29 at 19:53 -0700, Srikar Srimath Tirumala wrote:
> On 03/28/2016 06:35 PM, Eduardo Valentin wrote:
> > 
> > On Tue, Mar 15, 2016 at 11:08:00PM +0000, Pandruvada, Srinivas
> > wrote:
> > > 
> > > On Mon, 2016-03-14 at 11:12 -0700, Srikar Srimath Tirumala wrote:
[...]
> > I have created a wiki for LPC 2016
> > http://wiki.linuxplumbersconf.org/2016:thermal
> > 
> > Overall I believe we need to solve the (temperature) sensing in a
> > more
> > structured way within the kernel. We have three subsystem that
> > allow
> > performing temperature sensing. They are different in design and
> > concept, but still solve similar problems.
> > 
> I went through the LPC presentation/patches and had a couple of
> questions.
> 
> The thermal iio device seems perfectly suited for sending large
> amounts 
> of thermal data from the kernel framework to user space. Are there a
> lot 
> of platforms where thermal throttling happens in user space?
Yes. 

>  If so, Is 
> this an indication that passive thermal throttling is going into the 
> user space some time in the future?
Not really. Kernel takes care about more immediate/urgent needs. User
space is more about long term control, where you will prevent
aggressive controls from kernel.

Thanks,
Srinivas