Provided by: systemtap-doc_2.3-1ubuntu1.4_all 

NAME
function::task_parent - The task_struct of the parent task
SYNOPSIS
task_parent:long(task:long)
ARGUMENTS
task
task_struct pointer
DESCRIPTION
This function returns the parent task_struct of the given task. This address can be passed to the various
task_*() functions to extract more task-specific data.
SystemTap Tapset Reference March 2016 FUNCTION::TASK_PAREN(3stap)