.\" -*- nroff -*-
.TH TAPSET::IOSCHED 3stap "" "IBM"
.SH NAME
tapset::iosched \- systemtap IO scheduler probe points

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.SH DESCRIPTION

This family of probe points is used to probe the IO scheduler 
activities.  It contains the following probe points:

.P
.TP 
.B ioscheduler.elv_next_request
Fires when retrieves a request from request queue

.B Arguments:

.I elevator_name
  The elevator name

.P
.TP 
.B ioscheduler.elv_next_request.return
Fires when return from retrieving a request

.B Arguments:

.I req
  Address of the request

.I req_flags
  request flags

.I disk_major
  disk major number of the request

.I disk_minor
  disk minor number of the request

.P
.TP 
.B ioscheduler.elv_add_request
Fires when add a request into request queue

.B Arguments:

.I elevator_name
  The elevator name

.I req
  Address of the request

.I req_flags
  request flags

.I disk_major
  disk major number of the request

.I disk_minor
  disk minor number of the request

.P
.TP 
.B ioscheduler.elv_completed_request
Fires when a request is completed

.B Arguments:

.I elevator_name
  The elevator name

.I req
  Address of the request

.I req_flags
  request flags

.I disk_major
  disk major number of the request

.I disk_minor
  disk minor number of the request

.SH SEE ALSO
.IR stap (1),
.IR stapprobes (3stap)