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// IO scheduler tapset
// Copyright (C) 2005, 2006 IBM Corp.
// Copyright (C) 2010-2017 Red Hat Inc.
//
// 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.
// <tapsetdescription>
// This family of probe points is used to probe IO scheduler activities.
// </tapsetdescription>
%{
#include <linux/blkdev.h>
#include <linux/elevator.h>
%}
/**
* probe ioscheduler.elv_next_request - Fires when a request is retrieved from the request queue
* @name: Name of the probe point
* @elevator_name: The type of I/O elevator currently enabled
*/
probe ioscheduler.elv_next_request = kernel.function("blk_peek_request") !,
kernel.function("elv_next_request") ?
{
name = "elv_next_request"
elevator_name = kernel_string(
@choose_defined($q->elevator->type->elevator_name,
@choose_defined($q->elevator->elevator_type->elevator_name,
$q->elevator->elevator_name)), "")
}
/**
* probe ioscheduler.elv_next_request.return - Fires when a request retrieval issues a return signal
* @name: Name of the probe point
* @rq: Address of the request
* @rq_flags: Request flags
* @disk_major: Disk major number of the request
* @disk_minor: Disk minor number of the request
*/
probe ioscheduler.elv_next_request.return =
kernel.function("blk_peek_request").return !,
kernel.function("elv_next_request").return
{
name = "elv_next_request"
if ($return == 0) {
rq = 0
rq_flags = 0
disk_major = -1
disk_minor = -1
} else {
rq = $return
rq_flags = @choose_defined($return->cmd_flags, $return->flags)
if ($return->rq_disk == 0) {
disk_major = -1
disk_minor = -1
} else {
disk_major = $return->rq_disk->major
disk_minor = $return->rq_disk->first_minor
}
}
}
/**
* probe ioscheduler.elv_completed_request - Fires when a request is completed
* @name: Name of the probe point
* @elevator_name: The type of I/O elevator currently enabled
* @rq: Address of the request
* @rq_flags: Request flags
* @disk_major: Disk major number of the request
* @disk_minor: Disk minor number of the request
*/
probe ioscheduler.elv_completed_request
= kernel.function("elv_completed_request") ?
{
name = "elv_completed_request"
elevator_name = kernel_string(
@choose_defined($q->elevator->type->elevator_name,
@choose_defined($q->elevator->elevator_type->elevator_name,
$q->elevator->elevator_name)), "")
if($rq == 0) {
disk_major = -1
disk_minor = -1
} else {
if($rq->rq_disk == 0) {
disk_major = -1
disk_minor = -1
} else {
disk_major = $rq->rq_disk->major
disk_minor = $rq->rq_disk->first_minor
}
}
rq = $rq
rq_flags = ($rq == 0) ? 0
: @choose_defined($rq->cmd_flags, $rq->flags)
}
/**
* probe ioscheduler.elv_add_request.kp - kprobe based probe to indicate that a request was added to the request queue
* @name: Name of the probe point
* @elevator_name: The type of I/O elevator currently enabled
* @q: pointer to request queue
* @rq: Address of the request
* @rq_flags: Request flags
* @disk_major: Disk major number of the request
* @disk_minor: Disk minor number of the request
*/
// when a request is added to the request queue
probe ioscheduler.elv_add_request.kp =
kernel.function("elv_insert") !,
kernel.function("__elv_add_request")
{
name = "elv_add_request"
elevator_name = kernel_string(
@choose_defined($q->elevator->type->elevator_name,
@choose_defined($q->elevator->elevator_type->elevator_name,
$q->elevator->elevator_name)), "")
q = $q
if($rq == 0) {
disk_major = -1
disk_minor = -1
} else {
if($rq->rq_disk == 0) {
disk_major = -1
disk_minor = -1
} else {
disk_major = $rq->rq_disk->major
disk_minor = $rq->rq_disk->first_minor
}
}
rq = $rq
rq_flags = ($rq == 0) ? 0
: @choose_defined($rq->cmd_flags, $rq->flags)
}
/**
* probe ioscheduler.elv_add_request.tp - tracepoint based probe to indicate a request is added to the request queue.
* @name : Name of the probe point
* @elevator_name : The type of I/O elevator currently enabled.
* @q : Pointer to request queue.
* @rq : Address of request.
* @rq_flags : Request flags.
* @disk_major : Disk major no of request.
* @disk_minor : Disk minor number of request.
*
*/
probe ioscheduler.elv_add_request.tp = kernel.trace("block_rq_insert") ?
{
name = "elv_add_request"
q = $rq->q
elevator_name = kernel_string(
@choose_defined($rq->q->elevator->type->elevator_name,
@choose_defined($rq->q->elevator->elevator_type->elevator_name,
$rq->q->elevator->elevator_name)), "")
rq = $rq
if ($rq == 0 || $rq->rq_disk ==0) {
disk_major = -1
disk_minor = -1
}
else {
disk_major = $rq->rq_disk->major
disk_minor = $rq->rq_disk->first_minor
}
rq_flags = ($rq == 0) ? 0
: @choose_defined($rq->cmd_flags, $rq->flags)
}
/**
* probe ioscheduler.elv_add_request - probe to indicate request is added to the request queue.
* @elevator_name : The type of I/O elevator currently enabled.
* @q : Pointer to request queue.
* @rq : Address of request.
* @rq_flags : Request flags.
* @disk_major : Disk major no of request.
* @disk_minor : Disk minor number of request.
*
*/
probe ioscheduler.elv_add_request =
ioscheduler.elv_add_request.tp !, ioscheduler.elv_add_request.kp
{}
/**
* probe ioscheduler_trace.elv_completed_request - Fires when a request is
* completed.
* @name : Name of the probe point
* @elevator_name : The type of I/O elevator currently enabled.
* @rq : Address of request.
* @rq_flags : Request flags.
* @disk_major : Disk major no of request.
* @disk_minor : Disk minor number of request.
*
*/
probe ioscheduler_trace.elv_completed_request
= kernel.trace("block_rq_complete") ?
{
name = "elv_completed_request"
q = $rq->q
elevator_name = kernel_string(
@choose_defined($rq->q->elevator->type->elevator_name,
@choose_defined($rq->q->elevator->elevator_type->elevator_name,
$rq->q->elevator->elevator_name)), "")
rq = $rq
if ($rq == 0 || $rq->rq_disk ==0) {
disk_major = -1
disk_minor = -1
}
else {
disk_major = $rq->rq_disk->major
disk_minor = $rq->rq_disk->first_minor
}
rq_flags = ($rq == 0) ? 0
: @choose_defined($rq->cmd_flags, $rq->flags)
}
/**
* probe ioscheduler_trace.elv_issue_request - Fires when a request is
* scheduled.
* @name : Name of the probe point
* @elevator_name : The type of I/O elevator currently enabled.
* @rq : Address of request.
* @rq_flags : Request flags.
* @disk_major : Disk major no of request.
* @disk_minor : Disk minor number of request.
*
*/
probe ioscheduler_trace.elv_issue_request
= kernel.trace("block_rq_issue") ?
{
name = "elv_issue_request"
q = $rq->q
elevator_name = kernel_string(
@choose_defined($rq->q->elevator->type->elevator_name,
@choose_defined($rq->q->elevator->elevator_type->elevator_name,
$rq->q->elevator->elevator_name)), "")
rq = $rq
if ($rq == 0 || $rq->rq_disk ==0) {
disk_major = -1
disk_minor = -1
}
else {
disk_major = $rq->rq_disk->major
disk_minor = $rq->rq_disk->first_minor
}
rq_flags = ($rq == 0) ? 0
: @choose_defined($rq->cmd_flags, $rq->flags)
}
/**
* probe ioscheduler_trace.elv_requeue_request - Fires when a request is
* put back on the queue, when the hadware cannot accept more requests.
* @name : Name of the probe point
* @elevator_name : The type of I/O elevator currently enabled.
* @rq : Address of request.
* @rq_flags : Request flags.
* @disk_major : Disk major no of request.
* @disk_minor : Disk minor number of request.
*
*/
probe ioscheduler_trace.elv_requeue_request
= kernel.trace("block_rq_requeue") ?
{
name = "elv_requeue_request"
q = $rq->q
elevator_name = kernel_string(
@choose_defined($rq->q->elevator->type->elevator_name,
@choose_defined($rq->q->elevator->elevator_type->elevator_name,
$rq->q->elevator->elevator_name)), "")
rq = $rq
if ($rq == 0 || $rq->rq_disk ==0) {
disk_major = -1
disk_minor = -1
}
else {
disk_major = $rq->rq_disk->major
disk_minor = $rq->rq_disk->first_minor
}
rq_flags = ($rq == 0) ? 0
: @choose_defined($rq->cmd_flags, $rq->flags)
}
/**
* probe ioscheduler_trace.elv_abort_request - Fires when a request is aborted.
* @name : Name of the probe point
* @elevator_name : The type of I/O elevator currently enabled.
* @rq : Address of request.
* @rq_flags : Request flags.
* @disk_major : Disk major no of request.
* @disk_minor : Disk minor number of request.
*
*/
probe ioscheduler_trace.elv_abort_request
= kernel.trace("block_rq_abort") ?
{
name = "elv_abort_request"
q = $rq->q
elevator_name = kernel_string(
@choose_defined($rq->q->elevator->type->elevator_name,
@choose_defined($rq->q->elevator->elevator_type->elevator_name,
$rq->q->elevator->elevator_name)), "")
rq = $rq
if ($rq == 0 || $rq->rq_disk ==0) {
disk_major = -1
disk_minor = -1
}
else {
disk_major = $rq->rq_disk->major
disk_minor = $rq->rq_disk->first_minor
}
rq_flags = ($rq == 0) ? 0
: @choose_defined($rq->cmd_flags, $rq->flags)
}
/**
* probe ioscheduler_trace.plug - Fires when a request queue is plugged;
* ie, requests in the queue cannot be serviced by block driver.
* @name : Name of the probe point
* @rq_queue : request queue
*
*/
probe ioscheduler_trace.plug = kernel.trace("block_plug") ?
{
name = "plug"
rq_queue = $q
}
/**
* probe ioscheduler_trace.unplug_io - Fires when a request queue is unplugged;
* Either, when number of pending requests in the queue exceeds threshold
* or, upon expiration of timer that was activated when queue was plugged.
* @name : Name of the probe point
* @rq_queue : request queue
*
*/
probe ioscheduler_trace.unplug_io = kernel.trace("block_unplug_io") ?
{
name = "unplug_io"
rq_queue = $q
}
/**
* probe ioscheduler_trace.unplug_timer - Fires when unplug timer associated
* with a request queue expires.
* @name : Name of the probe point
* @rq_queue : request queue
*
*/
probe ioscheduler_trace.unplug_timer = kernel.trace("block_unplug_timer") ?
{
name = "unplug_timer"
rq_queue = $q
}
function disk_major_from_request:long(var_q:long)
%{ /* pure */
struct request_queue *q = (struct request_queue *)((uintptr_t)STAP_ARG_var_q);
/* We need to make sure there isn't a deref hazard here when
* reading 'q->queue_head'. However, kread() wants a pointer to
* a pointer, and we can't provide that for 'q->queue_head'
* since the list_head structure is directly embedded in the
* 'struct request_queue'. So, we validate all the members of
* the list_head structure instead. */
(void) kread(&(q->queue_head.next));
(void) kread(&(q->queue_head.prev));
if (list_empty(&(q->queue_head)))
STAP_RETVALUE = -1;
else {
struct request *rq = list_entry_rq(q->queue_head.next);
struct gendisk *rq_disk = kread(&(rq->rq_disk));
STAP_RETVALUE = kread(&(rq_disk->major));
}
CATCH_DEREF_FAULT();
%}
function disk_minor_from_request:long(var_q:long)
%{ /* pure */
struct request_queue *q = (struct request_queue *)((uintptr_t)STAP_ARG_var_q);
/* We need to make sure there isn't a deref hazard here when
* reading 'q->queue_head'. However, kread() wants a pointer to
* a pointer, and we can't provide that for 'q->queue_head'
* since the list_head structure is directly embedded in the
* 'struct request_queue'. So, we validate all the members of
* the list_head structure instead. */
(void) kread(&(q->queue_head.next));
(void) kread(&(q->queue_head.prev));
if (list_empty(&(q->queue_head)))
STAP_RETVALUE = -1;
else {
struct request *rq = list_entry_rq(q->queue_head.next);
struct gendisk *rq_disk = kread(&(rq->rq_disk));
STAP_RETVALUE = kread(&(rq_disk->first_minor));
}
CATCH_DEREF_FAULT();
%}