Provided by: systemtap-doc_2.9-2ubuntu2_all 

NAME
function::stack_used - Returns the amount of kernel stack used
SYNOPSIS
stack_used:long()
ARGUMENTS
None
DESCRIPTION
This function determines how many bytes are currently used in the kernel stack.
SEE ALSO
tapset::context(3stap)
SystemTap Tapset Reference April 2016 FUNCTION::STACK_USED(3stap)