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    SubjectRe: [RFD] Automatic suspend
    Date
    Am Freitag 20 Februar 2009 11:46:55 schrieb Rafael J. Wysocki:
    > On Thursday 19 February 2009, Oliver Neukum wrote:
    > > Am Donnerstag 19 Februar 2009 23:21:46 schrieb Rafael J. Wysocki:
    > > > > That's the whole point behind userspace wakelocks! They provide a
    > > > > mechanism for userspace to tell the kernel when (as far as userspace
    > >
    > > is
    > >
    > > > > concerned) it is or is not okay to auto-sleep.
    > > >
    > > > Still, one can go further and observe that the user space can in fact
    > > > start automatic suspend by itself whenever it knows it's appropriate
    > > > ...
    > >
    > > User space initiating this is a race condition.
    >
    > Do you mean a race with the other user space processes or with the kernel?

    With the set of runnable processes.There's always a window between
    evaluating the current set of runnable tasks and telling the kernel to sleep.
    IMO the most elegant solution would be a task attribute that would signal
    the kernel that a task should not count as keeping the system busy even
    if it is runnable and trigger the sleep in kernel space.

    Regards
    Oliver



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