linux-kernel - Re: Re: [RFC RESEND 0/3] Add watermark support to devfreq

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Date:	Tue, 16 Dec 2014 06:42:39 +0000 (GMT)
From:	MyungJoo Ham <myungjoo.ham@...sung.com>
To:	Alexandre Courbot <gnurou@...il.com>,
	Arto Merilainen <amerilainen@...dia.com>
Cc:	박경민 <kyungmin.park@...sung.com>,
	"tomeu.vizoso@...labora.com" <tomeu.vizoso@...labora.com>,
	"javier.martinez@...labora.co.uk" <javier.martinez@...labora.co.uk>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"thierry.reding@...il.com" <thierry.reding@...il.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"srasal@...dia.com" <srasal@...dia.com>
Subject: Re: Re: [RFC RESEND 0/3] Add watermark support to devfreq

Alexandre Courbot:
> 
> MyungJoo, the issue of having this feature in the core vs. having it
> as a devfreq "extension" aside, do you agree with the core idea? An
> informl ack for the idea would allow us to start leveraging this for
> the ACTMON driver. With a concrete user it will make it easier for
> everyone to understand how the pieces should fit together.

Yes, I love the idea of event/interrupt-driven DVFS and I agree with
the core idea. The remaining concern is that the current "implementation"
might be too invasive to the subsystem while it does not need to be as
a governor can always choose not to poll. And the other issues are
quite minor as well.

Actually, it appears that next-generations of some architectures
(I think I cannot publically say which and when) are going to support
this for general peripherals on the bus and the CPU soon.


Cheers,
MyungJoo


>