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

NAME
probe::ioscheduler.elv_next_request.return - Fires when a request retrieval issues a return signal
SYNOPSIS
ioscheduler.elv_next_request.return
VALUES
disk_major
Disk major number of the request
rq_flags
Request flags
rq
Address of the request
disk_minor
Disk minor number of the request
name
Name of the probe point
SystemTap Tapset Reference March 2016 PROBE::IOSCHEDULER(3stap)