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// Copyright (C) 2005, 2006 IBM Corp.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
/* only print backtrace for elv_add_request & elv_next_request*/
probe addevent.ioscheduler
= addevent.ioscheduler.elv_next_request,
addevent.ioscheduler.elv_completed_request,
addevent.ioscheduler.elv_add_request
{
}
/* when a request is retrieved from request queue */
probe addevent.ioscheduler.elv_next_request
+= ioscheduler.elv_next_request
{
if(filter_by_pid() == 1 ) {
log_ioscheduler_tracedata_elv_next(HOOKID_IOSCHED_NEXT_REQ, $q, backtrace)
}
}
/* when a request is added to the request queue */
probe addevent.ioscheduler.elv_add_request
+= ioscheduler.elv_add_request
{
if(filter_by_pid() == 1 ) {
log_ioscheduler_tracedata_others(HOOKID_IOSCHED_ADD_REQ, $q, $rq, backtrace)
}
}
/* when a request is completed */
probe addevent.ioscheduler.elv_completed_request
= ioscheduler.elv_completed_request
{
if(filter_by_pid() == 1 ) {
log_ioscheduler_tracedata_others(HOOKID_IOSCHED_REMOVE_REQ, $q, $rq, backtrace)
}
}
%{
#include <linux/blkdev.h>
#include <linux/elevator.h>
%}
/* log the data specific to __elv_add_request and elv_remove_request */
%( kernel_v >= "2.6.10" %?
function log_ioscheduler_tracedata_others(var_id:long, var_q:long, var_rq:long, backtrace:long)
%{
struct request *rq = (struct request *)((long)THIS->var_rq);
struct request_queue *q = (struct request_queue *)((long)THIS->var_q);
/* elevator name|major|minor| */
/* only print backtrace for elv_add_request */
if(THIS->backtrace == 1) {
String str = _stp_string_init (0);
_stp_stack_sprint (str, CONTEXT->regs, 0);
_lket_trace(_GROUP_IOSCHED, THIS->var_id, "%0s%1b%1b%0s", q->elevator->elevator_type->elevator_name,
(_FMT_)rq->rq_disk->major, (_FMT_)rq->rq_disk->first_minor, _stp_string_ptr(str));
} else {
_lket_trace(_GROUP_IOSCHED, THIS->var_id, "%0s%1b%1b", q->elevator->elevator_type->elevator_name,
(_FMT_)rq->rq_disk->major, (_FMT_)rq->rq_disk->first_minor);
}
%}
%:
function log_ioscheduler_tracedata_others(var_id:long, var_q:long, var_rq:long, backtrace:long)
%{
struct request *rq = (struct request *)((long)THIS->var_rq);
struct request_queue *q = (struct request_queue *)((long)THIS->var_q);
/* elevator name|major|minor| */
/* only print backtrace for elv_add_request */
if(THIS->backtrace == 1) {
String str = _stp_string_init (0);
_stp_stack_sprint (str, CONTEXT->regs, 0);
_lket_trace(_GROUP_IOSCHED, THIS->var_id, "%0s%1b%1b%0s", q->elevator.elevator_name,
(_FMT_)rq->rq_disk->major, (_FMT_)rq->rq_disk->first_minor, _stp_string_ptr(str));
} else {
_lket_trace(_GROUP_IOSCHED, THIS->var_id, "%0s%1b%1b", q->elevator.elevator_name,
(_FMT_)rq->rq_disk->major, (_FMT_)rq->rq_disk->first_minor);
}
%}
%)
/* log the data specific to elv_next_request, for kernel == 2.6.9 */
%( kernel_v >= "2.6.10" %?
/* log the data specific to elv_next_request , for kernel > 2.6.9*/
function log_ioscheduler_tracedata_elv_next(var_id:long, var:long, backtrace:long)
%{
struct request_queue *q;
struct request *rq;
q = (struct request_queue *)((long)THIS->var);
/* If there is a request in the request queue:
elevator name|major|minor|
if there is no request in the request queue:
elevator name|empty|
*/
if(THIS->backtrace == 1) {
String str = _stp_string_init (0);
_stp_stack_sprint (str, CONTEXT->regs, 0);
if(list_empty(&(q->queue_head))) {
_lket_trace(_GROUP_IOSCHED, THIS->var_id, "%0s%1b%1b%0s",
q->elevator->elevator_type->elevator_name, (_FMT_)-1, (_FMT_)-1, _stp_string_ptr(str));
} else {
rq = list_entry_rq(q->queue_head.next);
_lket_trace(_GROUP_IOSCHED, THIS->var_id, "%0s%1b%1b%0s",
q->elevator->elevator_type->elevator_name, (_FMT_)rq->rq_disk->major,
(_FMT_)rq->rq_disk->first_minor, _stp_string_ptr(str));
}
} else {
if(list_empty(&(q->queue_head))) {
_lket_trace(_GROUP_IOSCHED, THIS->var_id, "%0s%1b%1b",
q->elevator->elevator_type->elevator_name, (_FMT_)-1, (_FMT_)-1);
} else {
rq = list_entry_rq(q->queue_head.next);
_lket_trace(_GROUP_IOSCHED, THIS->var_id, "%0s%1b%1b",
q->elevator->elevator_type->elevator_name, (_FMT_)rq->rq_disk->major,
(_FMT_)rq->rq_disk->first_minor);
}
}
%}
%:
function log_ioscheduler_tracedata_elv_next(var_id:long, var:long, backtrace:long)
%{
struct request_queue *q;
struct request *rq;
q = (struct request_queue *)((long)THIS->var);
/* If there is a request in the request queue:
elevator name|major|minor|
if there is no request in the request queue:
elevator name|empty|
*/
if(THIS->backtrace == 1) {
String str = _stp_string_init (0);
_stp_stack_sprint (str, CONTEXT->regs, 0);
if(list_empty(&(q->queue_head))) {
_lket_trace(_GROUP_IOSCHED, THIS->var_id, "%0s%1b%1b%0s",
q->elevator.elevator_name, (_FMT_)-1, (_FMT_)-1, _stp_string_ptr(str));
} else {
rq = list_entry_rq(q->queue_head.next);
_lket_trace(_GROUP_IOSCHED, THIS->var_id, "%0s%1b%1b%0s", q->elevator.elevator_name,
(_FMT_)rq->rq_disk->major, (_FMT_)rq->rq_disk->first_minor, _stp_string_ptr(str));
}
} else {
if(list_empty(&(q->queue_head))) {
_lket_trace(_GROUP_IOSCHED, THIS->var_id, "%0s%1b%1b",
q->elevator.elevator_name, (_FMT_)-1, (_FMT_)-1);
} else {
rq = list_entry_rq(q->queue_head.next);
_lket_trace(_GROUP_IOSCHED, THIS->var_id, "%0s%1b%1b", q->elevator.elevator_name,
(_FMT_)rq->rq_disk->major, (_FMT_)rq->rq_disk->first_minor);
}
}
%}
%)
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