This is another way to compute guest time... I remove the "account modifiers"
mechanism and call directly account_guest_time() from account_system_time().
account_system_time() computes user, system and guest times according value
accumulated in vtime (a ktime_t) in task_struct by the virtual machine.
-- 
------------- Laurent.Vivier@bull.net  --------------
          "Software is hard" - Donald Knuth