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

NAME
probe::ioscheduler.elv_add_request - probe to indicate request is added to the request queue.
SYNOPSIS
ioscheduler.elv_add_request
VALUES
q
Pointer to request queue.
disk_minor
Disk minor number of request.
elevator_name
The type of I/O elevator currently enabled.
rq_flags
Request flags.
disk_major
Disk major no of request.
rq
Address of request.
SystemTap Tapset Reference March 2016 PROBE::IOSCHEDULER(3stap)