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)