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

NAME
function::task_time_string - Human readable string of task time usage
SYNOPSIS
task_time_string:string()
ARGUMENTS
None
DESCRIPTION
Returns a human readable string showing the user and system time the current task has used up to now. For
example “usr: 0m12.908s, sys: 1m6.851s”.
SystemTap Tapset Reference March 2016 FUNCTION::TASK_TIME_(3stap)