request

TAPSET::IOSCHED(3stap)													    TAPSET::IOSCHED(3stap)

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)

IBM
															    TAPSET::IOSCHED(3stap)