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Date: Thu, 13 May 2010 22:21:08 +0100
From: Matthew Garrett <mjg@redhat.com>
To: Tony Lindgren <tony@atomide.com>
Cc: Alan Stern <stern@rowland.harvard.edu>, Paul Walmsley <paul@pwsan.com>,
       Arve =?iso-8859-1?B?SGr4bm5lduVn?= <arve@android.com>,
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Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 6)
Message-ID: <20100513212108.GA22103@srcf.ucam.org>
References: <Pine.LNX.4.44L0.1005131002380.1695-100000@iolanthe.rowland.org> <20100513191717.GA3428@atomide.com> <20100513192522.GA19256@srcf.ucam.org> <20100513194205.GC3428@atomide.com> <20100513195349.GB19722@srcf.ucam.org> <20100513200003.GE3428@atomide.com> <20100513200814.GA20254@srcf.ucam.org> <20100513202320.GF3428@atomide.com> <20100513203412.GA21244@srcf.ucam.org> <20100513211006.GG3428@atomide.com>
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On Thu, May 13, 2010 at 02:10:06PM -0700, Tony Lindgren wrote:
> * Matthew Garrett <mjg@redhat.com> [100513 13:29]:
> > And if that's the application that's listening to the network socket 
> > that you want to get a wakeup event from? This problem is hard. I'd love 
> > there to be an elegant solution based on using the scheduler, but I 
> > really don't know what it is.
> 
> Your system should wake up to an interrupt in that case. Then you have
> the trusted apps running that can decide if the untrusted apps should
> be continued or not.

What race-free mechanism do you use to ensure that? It's very easy to 
handwave these problems away. It's very difficult to actually write an 
implementation that works.

-- 
Matthew Garrett | mjg59@srcf.ucam.org