On Thu, 27 May 2010, Alan Cox wrote: > > No, it's not. Forced suspend may be in response to hitting a key, but it > > You are the only person here talking about 'forced' suspends. The rest of > us are talking about idling down and ensuring we are always in a state we > un-idle correctly. > > > may also be in response to a 30 minute timeout expiring. If I get a WoL > > packet in the 0.5 of a second between userspace deciding to suspend and > > actually doing so, the system shouldn't suspend. > > I don't think that argument holds water in the form you have it > > What about 5 nanoseconds before you suspend. Now you can't do that (laws > of physics and stuff). > > So your position would seem to be "we have a race but can debate how big > is permissible" > > The usual model is > > "At no point should we be in a position when entering a suspend style > deep sleep where we neither abort the suspend, nor commit to a > suspend/resume sequence if the events we care about occur" > > and that is why the hardware model is > > Set wake flags > Check if idle > If idle > Suspend > else > Clear wake flags > Unwind > > and the wake flags guarantee that an event at any point after the wake > flags are set until they are cleared will cause a suspend to be resumed, > possibly immediately after the suspend. And if a platform can not guarantee the wakeup or the lossless transition of states then you can not solve this by throwing blockers or whatever into the code. Thanks, tglx _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
