stapprobes.iosched(3stap)
NAME
stapprobes.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