linux-kernel - Re: [linux-pm] [PATCH 0/8] Suspend block api (version 6)

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Date:	Sat, 15 May 2010 17:19:55 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Brian Swetland <swetland@...gle.com>
cc:	Kevin Hilman <khilman@...prootsystems.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Tony Lindgren <tony@...mide.com>,
	Matthew Garrett <mjg@...hat.com>,
	Paul Walmsley <paul@...an.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	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>,
	<magnus.damm@...il.com>, Theodore Ts'o <tytso@....edu>,
	mark gross <mgross@...ux.intel.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Geoff Smith <geoffx.smith@...el.com>,
	Benoît Cousson <b-cousson@...com>,
	<linux-omap@...r.kernel.org>, Vitaly Wool <vitalywool@...il.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 6)

On Fri, 14 May 2010, Brian Swetland wrote:

> In tickless mode, the time until next timer is a signed int, so the
> longest the kernel will ever sleep is ~2 seconds at a go.  In
> practice, userspace entities often have polling behavior that can
> trigger more often than that, and I've observed some kernel periodic
> timers (haven't cataloged them recently) that happen more often than
> once a second.

Paul and Kevin, how does the OMAP implementation handle these 
difficulties?

Also, how does it handle the issue of ill-behaved apps?

Alan Stern

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