linux-kernel - Re: [PATCH 1/8] PM: Add suspend block api.

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Date:	Mon, 3 May 2010 15:24:31 -0700
From:	Arve Hjønnevåg <arve@...roid.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@....cz>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Len Brown <len.brown@...el.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Nigel Cunningham <nigel@...onice.net>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Ming Lei <tom.leiming@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH 1/8] PM: Add suspend block api.

On Mon, May 3, 2010 at 3:11 PM, Alan Stern <stern@...land.harvard.edu> wrote:
> On Mon, 3 May 2010, Rafael J. Wysocki wrote:
>
>> The main problem is that the entire suspend subsystem is going to work in a
>> different way when suspend blockers are enforced.  Thus IMO it makes sense to
>> provide a switch between the "opportunistic" and "forced" modes, because that
>> clearly indicates to the user (or user space in general) how the whole suspend
>> subsystem actually works at the moment.
>>
>> As long as it's "opportunistic", the system will autosuspend if suspend
>> blockers are not active and the behavior of "state" reflects that.  If you want
>> to enforce a transition, switch to "forced" first.
>>
>> That's not at all confusing if you know what you're doing.  The defailt mode is
>> "forced", so the suspend subsystem works "as usual" by default.  You have to
>> directly switch it to "opportunistic" to change the behavior and once you've
>> done that, you shouldn't really be surprised that the behavior has changed.
>> That's what you've requested after all.
>
> How about changing the contents of /sys/power/state depending on the
> current policy?  When the policy is "forced" it should look the same as
> it does now.  When the policy is "opportunistic" it should contain
> "mem" and "on".

It already does this.

-- 
Arve Hjønnevåg
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