STAPPROBES.IOSCHED

Section: Misc. Reference Manual Pages (3stap)
Updated: 2009-10-21
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NAME

stapprobes.iosched - systemtap IO scheduler probe points

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

ioscheduler.elv_next_request

Fires when retrieves a request from request queue

Arguments:

elevator_name
The elevator name

ioscheduler.elv_next_request.return

Fires when return from retrieving a request

Arguments:

req
Address of the request

req_flags
request flags

disk_major
disk major number of the request

disk_minor
disk minor number of the request

ioscheduler.elv_add_request

Fires when add a request into request queue

Arguments:

elevator_name
The elevator name

req
Address of the request

req_flags
request flags

disk_major
disk major number of the request

disk_minor
disk minor number of the request

ioscheduler.elv_completed_request

Fires when a request is completed

Arguments:

elevator_name
The elevator name

req
Address of the request

req_flags
request flags

disk_major
disk major number of the request

disk_minor
disk minor number of the request