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

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Date:	Tue, 18 May 2010 23:14:08 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Arve Hjønnevåg <arve@...roid.com>
Cc:	Brian Swetland <swetland@...gle.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/8] Suspend block api (version 7)

On Tuesday 18 May 2010, Arve Hjønnevåg wrote:
> 2010/5/18 Rafael J. Wysocki <rjw@...k.pl>:
> > On Tuesday 18 May 2010, Arve Hjønnevåg wrote:
> >> On Mon, May 17, 2010 at 2:44 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> >> > On Monday 17 May 2010, Brian Swetland wrote:
> >> >> On Mon, May 17, 2010 at 1:40 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> >> >> > On Monday 17 May 2010, Arve Hjønnevåg wrote:
> >> >> >>
...
> 
> > Now, to make it more "user-friendly", we can simply use
> > queue_delayed_work() with a reasonable delay instead of queue_work() to queue
> > the suspend work (the delay may be configurable via sysfs).
> >
> 
> I can add a delay (and the timeout support code does add a delay as an
> optimization) to the unknown wakeup case, but this does not fix the
> problem of a user turning on opportunistic suspend with a user space
> framework that does not use suspend blockers. If the kernel uses
> suspend blockers to make sure the wakeup event makes it to user space,
> but user space does not block suspend, then the system will suspend
> before the event is processed.

But the user can still manually write to /sys/power/state. :-)

Rafael
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