kernel/trace/preemptirq_delay_test.c

File Facts

System

Linux kernel

Corpus path

kernel/trace/preemptirq_delay_test.c

Extension

.c

Size

4791 bytes

Lines

223

Domain

Core OS

Bucket

Scheduler, Processes, Timers, Sync, And Syscalls

Inferred role

Core OS: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/trace_clock.h
• linux/delay.h
• linux/interrupt.h
• linux/irq.h
• linux/kernel.h
• linux/kobject.h
• linux/kthread.h
• linux/module.h
• linux/printk.h
• linux/string.h
• linux/sysfs.h
• linux/completion.h

Detected Declarations

• function busy_wait
• function irqoff_test
• function preemptoff_test
• function execute_preemptirqtest
• function preemptirq_delay_run
• function preemptirq_run_test
• function trigger_store
• function preemptirq_delay_init
• function preemptirq_delay_exit
• module init preemptirq_delay_init

Annotated Snippet

module_init(preemptirq_delay_init)
module_exit(preemptirq_delay_exit)
MODULE_DESCRIPTION("Preempt / IRQ disable delay thread to test latency tracers");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `linux/trace_clock.h`, `linux/delay.h`, `linux/interrupt.h`, `linux/irq.h`, `linux/kernel.h`, `linux/kobject.h`, `linux/kthread.h`, `linux/module.h`.
• Detected declarations: `function busy_wait`, `function irqoff_test`, `function preemptoff_test`, `function execute_preemptirqtest`, `function preemptirq_delay_run`, `function preemptirq_run_test`, `function trigger_store`, `function preemptirq_delay_init`, `function preemptirq_delay_exit`, `module init preemptirq_delay_init`.
• Atlas domain: Core OS / Scheduler, Processes, Timers, Sync, And Syscalls.
• Implementation status: integration implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.