Messages in this thread | | | Date | Fri, 27 Feb 2009 11:09:41 +0100 | From | Pavel Machek <> | Subject | Re: [RFD] Automatic suspend |
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Hi!
> > > Then, the decision making logic will be able to use /sys/power/sleep whenever > > > it wishes to and the kernel will be able to refuse to suspend if it's not > > > desirable at the moment. > > > > > > It seems to be flexible enough to me. > > > > This seems flexible enough to avoid race conditions, but it forces the > > user space power manager to poll when the kernel refuse suspend. > > And if the kernel is supposed to start automatic suspend, it has to monitor > all of the wakelocks. IMO, it's better to allow the power manager to poll the > kernel if it refuses to suspend.
polling is evil -- it keeps CPU wake up => wastes power.
Wakelocks done right are single atomic_t... and if you set it to 0, you just unblock "sleeper" thread or something. Zero polling and very simple... Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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