NAME¶

tapset::iosched - systemtap IO scheduler probe points

DESCRIPTION¶

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

 

SEE ALSO¶

stap(1), stapprobes(3stap)