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Date: Thu, 6 May 2010 10:38:08 -0700
From: Tony Lindgren <tony@atomide.com>
To: Matthew Garrett <mjg@redhat.com>
Cc: Brian Swetland <swetland@google.com>,
       Alan Stern <stern@rowland.harvard.edu>,
       mark gross <mgross@linux.intel.com>, markgross@thegnar.org,
       Len Brown <len.brown@intel.com>, linux-doc@vger.kernel.org,
       Kernel development list <linux-kernel@vger.kernel.org>,
       Jesse Barnes <jbarnes@virtuousgeek.org>,
       Oleg Nesterov <oleg@redhat.com>, Tejun Heo <tj@kernel.org>,
       Linux-pm mailing list <linux-pm@lists.linux-foundation.org>,
       Wu Fengguang <fengguang.wu@intel.com>,
       Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [linux-pm] [PATCH 1/8] PM: Add suspend block api.
Message-ID: <20100506173807.GD30928@atomide.com>
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* Matthew Garrett <mjg@redhat.com> [100506 10:17]:
> On Thu, May 06, 2010 at 10:14:53AM -0700, Tony Lindgren wrote:
> 
> > Why would you need to constantly try to suspend in that case?
> 
> Because otherwise you're awake for longer than you need to be.

If your system is idle and your hardware supports off-while-idle,
then that really does not matter. There's not much of a difference
in power savings, we're already talking over 10 days on batteries
with just off-while-idle on omaps.

If your userspace keeps polling and has runaway timers, then you
could suspend it's parent process to idle the system?

Regards,

Tony