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    SubjectRe: [RFD] Automatic suspend
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    On Friday 27 February 2009, Pavel Machek wrote:
    > 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...

    Except that you have to check all of the wakelocks periodically in a loop =>
    polling. So?

    Rafael


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