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

NAME
function::proc_mem_data - Program data size (data + stack) in pages
SYNOPSIS
proc_mem_data:long()
ARGUMENTS
None
DESCRIPTION
Returns the current process data size (data + stack) in pages, or zero when there is no current process
or the number of pages couldn't be retrieved.
SystemTap Tapset Reference March 2016 FUNCTION::PROC_MEM_D(3stap)