Re: [RFC - 0/9] Generic timekeeping subsystem (v. B5)

[john stultz <johnstul@us.ibm.com>]

On Wed, 2005-08-24 at 20:48 +0200, Roman Zippel wrote:
> Hi,
> 
> On Wed, 24 Aug 2005, john stultz wrote:
> 
> > Ok, so then to clarify the above (as you mention gettimeofday uses
> > system_time), would your gettimeofday look something like:
> > 
> > gettiemofday():
> > 	return (system_time + (cycle_offset * mult) + error)>> shift
> > 
> > ?
> 
> No.
> 
> 	reference_time = xtime;
> 	system_time = xtime + error >> shift;
> 	gettimeofday = system_time + (cycle_offset * mult) >> shift;

Eh? In your example code from before you look to be keeping the
system_time and error values in shifted nsec units.

from your example:
>		// at init: system_update = update_cycles * mult;
> 		system_time += system_update;

and:
> 	error = system_time - (xtime.tv_nsec << shift);

This doesn't seem to make sense with the above.  Could you clarify?

thanks
-john

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