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

NAME
function::speculate - Store a string for possible output later
SYNOPSIS
speculate(id:long,output:string)
ARGUMENTS
id
buffer id to store the information in
output
string to write out when commit occurs
DESCRIPTION
Add a string to the speculaive buffer for id.
SystemTap Tapset Reference March 2016 FUNCTION::SPECULATE(3stap)