New "timeout" api, to replace callout

[M. Warner Losh]

In message: <19256.1196608121 at critter.freebsd.dk>
            "Poul-Henning Kamp" <phk at phk.freebsd.dk> writes:
: In message <20071202055031.A8107 at xorpc.icir.org>, Luigi Rizzo writes:
: 
: 
: >This is why i suggest having a 'scale' that can represent '1 tick'
: >(and also don't depend on TIMEOUT_MSEC == 1000 and so on, but keep
: >them opaque and require that the client code uses one of the supported
: >scales).
: 
: 
: Using a deadline timer based in the HPET, the timeout can be scheduled
: to any 1/14318181th of a second and there will be no concept of "a
: tick" as we know it now.
: 
: Clients should say how often they want to be called, and they should
: express it in terms of time, not based on some implementation detail
: of a historical implementation of the scheduler.

Yes.  I'd definitely like to move to this sort of thing.  I missed the
conversion routines in my last email, so ignore that part of things...

Does this mean that you're planning a so-called tickless
implementation?

Warner