• Jeremy Fitzhardinge's avatar
    Add a sched_clock paravirt_op · 688340ea
    Jeremy Fitzhardinge authored
    The tsc-based get_scheduled_cycles interface is not a good match for
    Xen's runstate accounting, which reports everything in nanoseconds.
    
    This patch replaces this interface with a sched_clock interface, which
    matches both Xen and VMI's requirements.
    
    In order to do this, we:
       1. replace get_scheduled_cycles with sched_clock
       2. hoist cycles_2_ns into a common header
       3. update vmi accordingly
    
    One thing to note: because sched_clock is implemented as a weak
    function in kernel/sched.c, we must define a real function in order to
    override this weak binding.  This means the usual paravirt_ops
    technique of using an inline function won't work in this case.
    Signed-off-by: default avatarJeremy Fitzhardinge <jeremy@xensource.com>
    Cc: Zachary Amsden <zach@vmware.com>
    Cc: Dan Hecht <dhecht@vmware.com>
    Cc: john stultz <johnstul@us.ibm.com>
    688340ea
paravirt.h 29 KB