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

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Message-ID: <20100810154405.475c2669@lxorguk.ukuu.org.uk>
Date:	Tue, 10 Aug 2010 15:44:05 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	paulmck@...ux.vnet.ibm.com, "Ted Ts'o" <tytso@....edu>,
	Felipe Contreras <felipe.contreras@...il.com>, david@...g.hm,
	Brian Swetland <swetland@...gle.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	arve@...roid.com, 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

Which reminds me. I forgot a very important way that user space signals
the kernel as to its intents.

The kernel can see whether code is sleeping by choice or sleeping because
someone blocked it (eg a page fault). The kernel also knows a lot about
the event being waited for (much more so in -rt than base).

We don't capture all of that info but it seems it would advance progress
in the right direction to do so better.

Alan

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