diff --git a/src/system/kernel/device_manager/IOSchedulerRoster.cpp b/src/system/kernel/device_manager/IOSchedulerRoster.cpp
index 5724aa17b6..751fe218c7 100644
--- a/src/system/kernel/device_manager/IOSchedulerRoster.cpp
+++ b/src/system/kernel/device_manager/IOSchedulerRoster.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright 2009-2010, Ingo Weinhold, ingo_weinhold@gmx.de.
+ * Copyright 2024, Haiku, Inc. All rights reserved.
  * Distributed under the terms of the MIT License.
  */
 
@@ -12,10 +13,20 @@
 /*static*/ IOSchedulerRoster IOSchedulerRoster::sDefaultInstance;
 
 
-/*static*/ void
-IOSchedulerRoster::Init()
+IOSchedulerRoster::IOSchedulerRoster()
+	:
+	fNextID(1),
+	fNotificationService("I/O")
 {
-	new(&sDefaultInstance) IOSchedulerRoster;
+	mutex_init(&fLock, "IOSchedulerRoster");
+	fNotificationService.Register();
+}
+
+
+IOSchedulerRoster::~IOSchedulerRoster()
+{
+	mutex_destroy(&fLock);
+	fNotificationService.Unregister();
 }
 
 
@@ -72,18 +83,109 @@ IOSchedulerRoster::NextID()
 }
 
 
-IOSchedulerRoster::IOSchedulerRoster()
-	:
-	fNextID(1),
-	fNotificationService("I/O")
+//	#pragma mark - debug methods and initialization
+
+
+static int
+dump_io_scheduler(int argc, char** argv)
 {
-	mutex_init(&fLock, "IOSchedulerRoster");
-	fNotificationService.Register();
+	if (argc != 2) {
+		print_debugger_command_usage(argv[0]);
+		return 0;
+	}
+
+	IOScheduler* scheduler = (IOScheduler*)parse_expression(argv[1]);
+	scheduler->Dump();
+	return 0;
 }
 
 
-IOSchedulerRoster::~IOSchedulerRoster()
+static int
+dump_io_request_owner(int argc, char** argv)
 {
-	mutex_destroy(&fLock);
-	fNotificationService.Unregister();
+	if (argc != 2) {
+		print_debugger_command_usage(argv[0]);
+		return 0;
+	}
+
+	IORequestOwner* owner = (IORequestOwner*)parse_expression(argv[1]);
+	owner->Dump();
+	return 0;
+}
+
+
+static int
+dump_io_request(int argc, char** argv)
+{
+	if (argc != 2 || !strcmp(argv[1], "--help")) {
+		kprintf("usage: %s <ptr-to-io-request>\n", argv[0]);
+		return 0;
+	}
+
+	IORequest* request = (IORequest*)parse_expression(argv[1]);
+	request->Dump();
+	return 0;
+}
+
+
+static int
+dump_io_operation(int argc, char** argv)
+{
+	if (argc != 2 || !strcmp(argv[1], "--help")) {
+		kprintf("usage: %s <ptr-to-io-operation>\n", argv[0]);
+		return 0;
+	}
+
+	IOOperation* operation = (IOOperation*)parse_expression(argv[1]);
+	operation->Dump();
+	return 0;
+}
+
+
+static int
+dump_io_buffer(int argc, char** argv)
+{
+	if (argc != 2 || !strcmp(argv[1], "--help")) {
+		kprintf("usage: %s <ptr-to-io-buffer>\n", argv[0]);
+		return 0;
+	}
+
+	IOBuffer* buffer = (IOBuffer*)parse_expression(argv[1]);
+	buffer->Dump();
+	return 0;
+}
+
+
+static int
+dump_dma_buffer(int argc, char** argv)
+{
+	if (argc != 2 || !strcmp(argv[1], "--help")) {
+		kprintf("usage: %s <ptr-to-dma-buffer>\n", argv[0]);
+		return 0;
+	}
+
+	DMABuffer* buffer = (DMABuffer*)parse_expression(argv[1]);
+	buffer->Dump();
+	return 0;
+}
+
+
+/*static*/ void
+IOSchedulerRoster::Init()
+{
+	new(&sDefaultInstance) IOSchedulerRoster;
+
+	add_debugger_command_etc("io_scheduler", &dump_io_scheduler,
+		"Dump an I/O scheduler",
+		"<scheduler>\n"
+		"Dumps I/O scheduler at address <scheduler>.\n", 0);
+	add_debugger_command_etc("io_request_owner", &dump_io_request_owner,
+		"Dump an I/O request owner",
+		"<owner>\n"
+		"Dumps I/O request owner at address <owner>.\n", 0);
+	add_debugger_command("io_request", &dump_io_request, "dump an I/O request");
+	add_debugger_command("io_operation", &dump_io_operation,
+		"dump an I/O operation");
+	add_debugger_command("io_buffer", &dump_io_buffer, "dump an I/O buffer");
+	add_debugger_command("dma_buffer", &dump_dma_buffer, "dump a DMA buffer");
 }
diff --git a/src/system/kernel/device_manager/device_manager.cpp b/src/system/kernel/device_manager/device_manager.cpp
index 3a577abeb8..72a855517d 100644
--- a/src/system/kernel/device_manager/device_manager.cpp
+++ b/src/system/kernel/device_manager/device_manager.cpp
@@ -30,7 +30,6 @@
 #include "AbstractModuleDevice.h"
 #include "devfs_private.h"
 #include "id_generator.h"
-#include "IORequest.h"
 #include "io_resources.h"
 #include "IOSchedulerRoster.h"
 
@@ -290,90 +289,6 @@ dump_attribute(device_attr* attr, int32 level)
 }
 
 
-static int
-dump_io_scheduler(int argc, char** argv)
-{
-	if (argc != 2) {
-		print_debugger_command_usage(argv[0]);
-		return 0;
-	}
-
-	IOScheduler* scheduler = (IOScheduler*)parse_expression(argv[1]);
-	scheduler->Dump();
-	return 0;
-}
-
-
-static int
-dump_io_request_owner(int argc, char** argv)
-{
-	if (argc != 2) {
-		print_debugger_command_usage(argv[0]);
-		return 0;
-	}
-
-	IORequestOwner* owner = (IORequestOwner*)parse_expression(argv[1]);
-	owner->Dump();
-	return 0;
-}
-
-
-static int
-dump_io_request(int argc, char** argv)
-{
-	if (argc != 2 || !strcmp(argv[1], "--help")) {
-		kprintf("usage: %s <ptr-to-io-request>\n", argv[0]);
-		return 0;
-	}
-
-	IORequest* request = (IORequest*)parse_expression(argv[1]);
-	request->Dump();
-	return 0;
-}
-
-
-static int
-dump_io_operation(int argc, char** argv)
-{
-	if (argc != 2 || !strcmp(argv[1], "--help")) {
-		kprintf("usage: %s <ptr-to-io-operation>\n", argv[0]);
-		return 0;
-	}
-
-	IOOperation* operation = (IOOperation*)parse_expression(argv[1]);
-	operation->Dump();
-	return 0;
-}
-
-
-static int
-dump_io_buffer(int argc, char** argv)
-{
-	if (argc != 2 || !strcmp(argv[1], "--help")) {
-		kprintf("usage: %s <ptr-to-io-buffer>\n", argv[0]);
-		return 0;
-	}
-
-	IOBuffer* buffer = (IOBuffer*)parse_expression(argv[1]);
-	buffer->Dump();
-	return 0;
-}
-
-
-static int
-dump_dma_buffer(int argc, char** argv)
-{
-	if (argc != 2 || !strcmp(argv[1], "--help")) {
-		kprintf("usage: %s <ptr-to-dma-buffer>\n", argv[0]);
-		return 0;
-	}
-
-	DMABuffer* buffer = (DMABuffer*)parse_expression(argv[1]);
-	buffer->Dump();
-	return 0;
-}
-
-
 static int
 dump_device_nodes(int argc, char** argv)
 {
@@ -2466,19 +2381,6 @@ device_manager_init(struct kernel_args* args)
 
 	add_debugger_command("dm_tree", &dump_device_nodes,
 		"dump device node tree");
-	add_debugger_command_etc("io_scheduler", &dump_io_scheduler,
-		"Dump an I/O scheduler",
-		"<scheduler>\n"
-		"Dumps I/O scheduler at address <scheduler>.\n", 0);
-	add_debugger_command_etc("io_request_owner", &dump_io_request_owner,
-		"Dump an I/O request owner",
-		"<owner>\n"
-		"Dumps I/O request owner at address <owner>.\n", 0);
-	add_debugger_command("io_request", &dump_io_request, "dump an I/O request");
-	add_debugger_command("io_operation", &dump_io_operation,
-		"dump an I/O operation");
-	add_debugger_command("io_buffer", &dump_io_buffer, "dump an I/O buffer");
-	add_debugger_command("dma_buffer", &dump_dma_buffer, "dump a DMA buffer");
 
 	init_node_tree();