Provided by: systemtap-doc_2.9-2ubuntu2_all 

NAME
function::task_pid - The process identifier of the task
SYNOPSIS
task_pid:long(task:long)
ARGUMENTS
task
task_struct pointer
DESCRIPTION
This fucntion returns the process id of the given task.
SEE ALSO
tapset::task(3stap)
SystemTap Tapset Reference April 2016 FUNCTION::TASK_PID(3stap)