linux-kernel - Re: Attempted summary of suspend-blockers LKML thread

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Date:	Thu, 5 Aug 2010 07:23:04 -0700
From:	Brian Swetland <swetland@...gle.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	david@...g.hm, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	pavel@....cz, florian@...kler.org, stern@...land.harvard.edu,
	peterz@...radead.org, tglx@...utronix.de, alan@...rguk.ukuu.org.uk
Subject: Re: Attempted summary of suspend-blockers LKML thread

On Thu, Aug 5, 2010 at 7:16 AM, Matthew Garrett <mjg59@...f.ucam.org> wrote:
> On Thu, Aug 05, 2010 at 07:07:06AM -0700, david@...g.hm wrote:
>> On Thu, 5 Aug 2010, Matthew Garrett wrote:
>>> The decision on whether or not to go to sleep isn't the difficult bit of
>>> this problem space.
>>
>> but isn't that all that wakelocks do? affect the decision on whether or
>> not to go to sleep.
>
> You could think of them that way, but it's not the useful aspect of them
> - that much could be implemented entirely in userspace. Wakelocks
> provide a mechanism for userspace to ensure that it's handled all
> received events before a system suspend takes place.

For userspace or the kernel -- some events may not require userspace
intervention, but do require the kernel to stay awake long enough to
finish chewing on them.  Say perhaps a wifi irq comes in, the wifi
driver/stack needs to process some beacon packets or whatnot.

Brian
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