linux-kernel - Re: [RFC][PATCH 5/5] PM / Domains: Add default power off governor function

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Date:	Fri, 2 Sep 2011 00:11:12 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jean Pihet <jean.pihet@...oldbits.com>
Cc:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Linux-sh list" <linux-sh@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Kevin Hilman <khilman@...com>
Subject: Re: [RFC][PATCH 5/5] PM / Domains: Add default power off governor function

Hi,

On Thursday, September 01, 2011, Jean Pihet wrote:
> Rafael,
> 
> On Wed, Aug 31, 2011 at 12:22 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > From: Rafael J. Wysocki <rjw@...k.pl>
> >
> > Add a function deciding whether or not a given PM domain should
> > be powered off on the basis of that domain's devices' PM QoS
> > constraints.
> >
> > ---
> >  drivers/base/power/domain_governor.c |   96 +++++++++++++++++++++++++++++++++++
> >  include/linux/pm_domain.h            |    7 ++
> >  2 files changed, 103 insertions(+)
> >
> > Index: linux/include/linux/pm_domain.h
> > ===================================================================
> > --- linux.orig/include/linux/pm_domain.h
> > +++ linux/include/linux/pm_domain.h
> > @@ -49,6 +49,10 @@ struct generic_pm_domain {
> >        int (*start_device)(struct device *dev);
> >        int (*stop_device)(struct device *dev);
> >        bool (*active_wakeup)(struct device *dev);
> > +       ktime_t power_off_latency;
> > +       ktime_t power_on_latency;
> > +       s64 break_even_ns;
> > +       s64 min_delta_ns;
> How are those values populated?

I'm not sure.  There are a few possible ways to do that, but I simply
don't know which one is going to be the most useful.  That's one of
the reasons why patches [4-5/5] are RFCs.

> Is there a mechanism that dynamically updates the values?

Obviously not at the moment.

Thanks,
Rafael
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