linux-kernel - Re: [PATCH 0/8] Suspend block api (version 7)

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Message-ID: <87sk5qw4vf.fsf@deeprootsystems.com>
Date:	Mon, 17 May 2010 15:16:52 -0700
From:	Kevin Hilman <khilman@...prootsystems.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Greg KH <gregkh@...e.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Brian Swetland <swetland@...gle.com>,
	Daniel Walker <dwalker@...o99.com>,
	"Theodore Ts'o" <tytso@....edu>, Matthew Garrett <mjg@...hat.com>
Subject: Re: [PATCH 0/8] Suspend block api (version 7)

"Rafael J. Wysocki" <rjw@...k.pl> writes:

> On Monday 17 May 2010, Arve Hjønnevåg wrote:

>> 
>> How about:
>> 
>> PM: Add opportunistic suspend support.
>
> "PM: Opportunistic suspend support" would be sufficient IMO.
>
> Now, I'd start with the motivation.  Like "Power management features present
> in the current mainline kernel are insufficient to get maximum possible energy
> savings on some platforms, such as Android, because ..." (here go explanations
> why this is the case in your opinion).

Yes, this will be helpful.

> Next, "To allow Android and similar platforms to save more energy than they
> currently can save using the mainline kernel, introduce a mechanism by which
> the system is automatically suspended (i.e. put into a system-wide sleep state)
> whenever it's not doing useful work, called opportunistic suspend".

Hopefully, a definition of "useful" will be given here, including by
what standards on-going work is determined not to be useful.

Kevin
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