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

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Message-ID: <20100812140903.GB11362@sirena.org.uk>
Date:	Thu, 12 Aug 2010 15:09:03 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Felipe Contreras <felipe.contreras@...il.com>
Cc:	Theodore Tso <tytso@....edu>, paulmck@...ux.vnet.ibm.com,
	Alan Cox <alan@...rguk.ukuu.org.uk>, david@...g.hm,
	Brian Swetland <swetland@...gle.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	arve@...roid.com, mjg59@...f.ucam.org, pavel@....cz,
	florian@...kler.org, rjw@...k.pl, stern@...land.harvard.edu,
	peterz@...radead.org, tglx@...utronix.de, menage@...gle.com,
	david-b@...bell.net, James.Bottomley@...e.de, arjan@...radead.org,
	swmike@....pp.se, galibert@...ox.com, dipankar@...ibm.com
Subject: Re: Attempted summary of suspend-blockers LKML thread, take three

On Thu, Aug 12, 2010 at 02:11:22PM +0300, Felipe Contreras wrote:

> So far, nobody has refuted these:
>  1) opportunistic suspend needs a good behaved user-space to work properly
>  2) if suspend blockers are enabled in a system, *all* user-space must
> implement them to work correctly

For this note that there's a fairly strong expectation that even in a
phone type environment a sane userspace implementation will involve a
very large portion of userspace just totally ignoring suspend blockers.
This means that while it is true that userspace as a whole must have
support for suspend blockers the changes required are substantially less
invasive than you appear to expecting.
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