On Wed, Nov 14, 2007 at 10:02:13PM +0000, David Laight wrote:
> On Wed, Nov 14, 2007 at 10:45:30PM +0100, Manuel Bouyer wrote:
> > Hi,
> > one remaining problem in bouyer-xenamd64 is that the time spent by a process
> > in userland is accounted as system time (in top, only system and interrupt
> > are non-0, user and nice are always 0 no matter what we do).
> > Can someone points me to the function where the various CPU times are
> > accounted, and eventually how it makes a difference between system and user
> > time ?
> 
> It is based on the clock interrupt counting whether the interrupted PC
> is user or system.  Then the total execution time (calculated from
> process switches) is split between user/system/interrupt based on the
> counts.  Look at calcru() in kern/kern_resource.c

Thanks ! This allowed me to diagnose an issue in the way the intrframe
address is computed. Looks like intrframe is only used for this ...

-- 
Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
     NetBSD: 26 ans d'experience feront toujours la difference
--