On Thu, Jul 19, 2007 at 08:29:06AM -0700, Jeremy Fitzhardinge wrote: > > - * Monotonic_clock - returns # of nanoseconds passed since time_init() > > + * Scheduler clock - returns current time in nanosec units. > > + * Now based on virtual cpu time to only account time the guest > > + * was actually running. > > > > Runn*ing*? Does it include time the VCPU spends idle/blocked? If not, > then the scheduler won't be able to tell how long a process has been > asleep.
Good point .. I think we need a measure of both virtual and real time here - virtual for accounting task-execution time and real for accounting sleep (and perhaps rq-wait?) time. > Maybe this doesn't matter (I had this problem in a version of > Xen's sched_clock, and I can't say I saw an ill effects from it). I guess it will show up as some corner case behaviour, which people are yet to discover on virtual env. -- Regards, vatsa - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/