#! /usr/bin/env stap
#
#
global time_offset

probe begin
{
    time_offset = gettimeofday_us() 
    printf("monitor begin==========\n")
}
probe scheduler.cpu_off
{
   if(task_execname(task_next)=="test2")
   {
       t = gettimeofday_us();
       printf("%9d : %20s(%6d)->%10s(%6d:%6d)\n",
            t-time_offset,
            task_execname(task_prev),
            task_pid(task_prev), 
            task_execname(task_next),
            task_pid(task_next),   #返回的是内核中的TGID
            task_tid(task_next))   #返回的内核中的PID 
   }
}