Re: [patch 00/21] hrtimer - High-resolution timer subsystem

From: Roman Zippel
Date: Wed Dec 14 2005 - 20:34:45 EST


Hi,

On Mon, 12 Dec 2005, George Anzinger wrote:

> My $0.02 worth: It is clear (from the standard) that the initial time is to be
> ABS_TIME.

Yes.

> It is also clear that the interval is to be added to that time.

Not necessarily. It says it_interval is a "reload value", it's used to
reload the timer to count down to the next expiration.
It's up to the implementation, whether it really counts down this time or
whether it converts it first into an absolute value.

> IMHO then, the result should have the same property, i.e. ABS_TIME. Sort of
> like adding an offset to a relative address. The result is still relative.

If the result is relative, why should have a clock set any effect?
IMO the spec makes it quite clear that initial timer and the periodic
timer are two different types of the timer. The initial timer only
specifies how the periodic timer is started and the periodic timer itself
is a "relative time service".

bye, Roman
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/