Re: [PATCH 0/8] Suspend block api (version 6)

On Fri, May 14, 2010 at 02:20:43PM -0600, Paul Walmsley wrote:
> Hello,
> 
> On Mon, 3 May 2010, Matthew Garrett wrote:
> 
> > I agree that the runtime scenario is a far more appealing one from an 
> > aesthetic standpoint, but so far we don't have a very compelling 
> > argument for dealing with the starting and stopping of userspace.
> 
> The problem of how to start and stop (some) userspace is not specifically 
> system power management-related, nor top-down, /sys/power/state-suspend 
> related.  PM is just one potential user.
>
> It's hard to see how the Android opportunistic suspend approach would be 
> useful for the other use-cases (e.g., checkpoint/restart).  On the other 
> hand, it's easier to see how something like freezer cgroups could be 
> useful for system power management and checkpoint/restart.

And difficult to see how to implement something using freezer cgroups 
that actually works in this case. Look, I don't want to sound like I 
have a one-track mind or anything, but all of these arguments would be 
significantly more compelling if someone would actually provide a 
concrete implementation proposal that deals with the set of use-cases 
that Google's implementation does and which doesn't make anyone cry. 
Otherwise the immeasurably most likely outcome is that this code gets 
merged and we get to live with it.
 
-- 
Matthew Garrett | mjg59@srcf.ucam.org