tapset::iosched(3)

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

tapset::iosched(3)

原文：http://www.cnblogs.com/zengkefu/p/5838396.html