On Wed, Sep 10, 2014 at 9:39 PM, <Valdis.Kletnieks@xxxxxx> wrote: > On Wed, 10 Sep 2014 21:23:28 +0300, Ran Shalit said: > >> As far as I understand, suspend/respond PM is not per device, but for >> all system, >> and wakeup source will resume again the whole system. >> I think you mean runtime suspend/resume in the answer. > > The original question didn't specify. You said "suspending that application", > not the entire system. > > And runtime suspend/resume of devices and even the CPU does fit within > your original question constraints. > > If you're looking at system-wide suspend/resume specificially, there's > two basic schemes in use: > > 1) User hits a button, acpid or similar notices, and does a suspend to > disk/ram/papertape/whatever. > > 2) User hits a button, closes the lid, or a user inactivity timer expires. > A process notices, and asks all processes which have registered for suspend > notifications "Is it OK if we suspend?", and if nobody says "Nay", it does it. > If a process complains, it is repeatedly polled until it finishes whatever it > was doing and says "OK now". Hi Veldis, The second scheme you mention is what I am required to achieve, but it raises some question: > or a user inactivity timer expires. A process notices... 1. How can I make a process to notice this inactivity ? Do you think it can be implemented by some periodic process who check if there is activity ? It returns to the original question I raised, that I will use some periodic process who checks maybe cpu load or something like that. What do you think ? > and asks all processes which have registered for suspend notifications "Is it OK if we suspend? 2. What Do you mean here by process ? Do you mean SW process which register for suspend notification (how do we do this) ? What about devices which register for suspend/resume. Must they accept the suspend ? Thanks very much, Ran _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
