linux-kernel - Re: [linux-pm] [PATCH 1/8] PM: Add suspend block api.

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Message-ID: <20100506183335.GE30928@atomide.com>
Date:	Thu, 6 May 2010 11:33:35 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	Brian Swetland <swetland@...gle.com>,
	Alan Stern <stern@...land.harvard.edu>,
	mark gross <mgross@...ux.intel.com>, markgross@...gnar.org,
	Len Brown <len.brown@...el.com>, linux-doc@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [linux-pm] [PATCH 1/8] PM: Add suspend block api.

* Matthew Garrett <mjg@...hat.com> [100506 10:39]:
> On Thu, May 06, 2010 at 10:38:08AM -0700, Tony Lindgren wrote:
> 
> > If your userspace keeps polling and has runaway timers, then you
> > could suspend it's parent process to idle the system?
> 
> If your userspace is suspended, how does it process the events that 
> generated a system wakeup? If we had a good answer to that then suspend 
> blockers would be much less necessary.

Well if your hardware runs off-while-idle or even just
retention-while-idle, then the basic shell works just fine waking up
every few seconds or so.

Then you could keep init/shell/suspend policy deamon running until
it's time to suspend the whole device. To cut down runaway timers,
you could already freeze the desktop/GUI/whatever earlier.

Regards,

Tony

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