#!/usr/bin/stap /* This script works similar to ftrace's sched_switch. It displays a list of * processes which get switched in and out of the scheduler. The format of display * is PROCESS_NAME PROCESS_PID CPU TIMESTAMP PID: PRIORITY: PROCESS STATE ->/+ * NEXT_PID : NEXT_PRIORITY: NEXT_STATE NEXT_PROCESS_NAME * -> indicates that prev process is scheduled out and the next process is * scheduled in. * + indicates that prev process has woken up the next process. * The usage is sched_switch.stp <"pid"/"name"> pid/name */ function state_calc(state) { if(state == 0) status = "R" if(state == 1) status = "S" if(state == 2) status = "D" if(state == 4) status = "T" if(state == 8) status = "T" if(state == 16) status = "Z" if(state == 32) status = "EXIT_DEAD" return status } probe scheduler.wakeup { %( $# == 2 %? if(@1 == "pid") if (task_pid != $2 && pid() != $2) next if(@1 == "name") if (task_execname(task) != @2 && execname() != @2) next %) printf("%-16s%5d%5d%d:%d:%s + %d:%d:%s %16s\n", execname(), task_cpu(task), gettimeofday_ns(), pid(), task_prio(task_current()), state_calc(task_state(task_current())), task_pid(task), task_prio(task), state_calc(task_state(task)), task_execname(task)) } probe scheduler.ctxswitch { %( $# == 2 %? if(@1 == "pid") if (next_pid != $2 && prev_pid != $2) next if(@1 == "name") if (prev_task_name != @2 && next_task_name != @2) next %) printf("%-16s%5d%5d%d:%d:%s ==> %d:%d:%s %16s\n",prev_task_name, task_cpu(prev_task),gettimeofday_ns(),prev_pid,prev_priority,state_calc(prevtsk_state),next_pid, next_priority,state_calc(nexttsk_state),next_task_name) }