Re: [RFC kvm-unit-tests] api: Add dirty logging performance test

[Avi Kivity <avi@redhat.com>]

On 01/08/2012 04:49 PM, Takuya Yoshikawa wrote:
> > > +
> > > +        gettimeofday(&start_time, NULL);
> > > +        slot.update_dirty_log();
> > > +        gettimeofday(&end_time, NULL);
> > 
> > Nicer to have a function that returns time in nanoseconds.
>
> I don't know such an API which can be used in userspace.

static uint64_t time_ns()
{
    struct timeval tv;

    gettimeofday(&tv, NULL);
    return tv.tv_sec * (uint64_t)1000000000 + tv.tv_usec * 1000;
}

(that's not nanosecond precision, but it gives a single number instead
of a pair; there's also clock_gettime() that does have nanosecond
precision).
> If we can use nano-precision timer, I want to check other things
> too, e.g. emulation.
>

-- 
error compiling committee.c: too many arguments to function