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// task information tapset
// Copyright (C) 2014 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
/* We remember the ancestry of a task in __task_ancestry_memo using the task
* address as key. Since different task_structs can re-use the same addresses,
* we also remember the start_time in __task_ancestry_times to check for expired
* memo entries.
*/
@__private30 global __task_ancestry_memo, __task_ancestry_times
/**
* sfunction task_ancestry - The ancestry of the given task
*
* @task: task_struct pointer
* @with_time: set to 1 to also print the start time of processes (given as a
* delta from boot time)
*
* Description: Return the ancestry of the given task in the form of
* "grandparent_process=>parent_process=>process".
*/
function task_ancestry:string (task:long, with_time:long) {
stime = task_start_time(task_pid(task))
if (__task_ancestry_memo[task] == ""
|| __task_ancestry_times[task] != stime) {
ptask = task_parent(task)
name = task_execname(task)
__task_ancestry_times[task] = stime
if (with_time)
stamp = sprintf("(%s)", nsecs_to_string(stime))
if (ptask == task) /* tree root */
__task_ancestry_memo[task] = sprintf("%s%s", name, stamp)
else
__task_ancestry_memo[task] = task_ancestry(ptask, with_time) . "=>"
. sprintf("%s%s", name, stamp)
}
return __task_ancestry_memo[task]
}
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