kernel/Kconfig.preempt

Source file repositories/reference/linux-study-clean/kernel/Kconfig.preempt

File Facts

System: Linux kernel
Corpus path: kernel/Kconfig.preempt
Extension: .preempt
Size: 7237 bytes
Lines: 195
Domain: Core OS
Bucket: Scheduler, Processes, Timers, Sync, And Syscalls
Inferred role: Core OS: Scheduler, Processes, Timers, Sync, And Syscalls
Status: atlas-only

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.
Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

No C-style include directives detected by the generator.

Detected Declarations

No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

# SPDX-License-Identifier: GPL-2.0-only

config PREEMPT_NONE_BUILD
	bool

config PREEMPT_VOLUNTARY_BUILD
	bool

config PREEMPT_BUILD
	bool
	select PREEMPTION
	select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK

config ARCH_HAS_PREEMPT_LAZY
	bool

choice
	prompt "Preemption Model"
	default PREEMPT_LAZY if ARCH_HAS_PREEMPT_LAZY
	default PREEMPT_NONE

config PREEMPT_NONE
	bool "No Forced Preemption (Server)"
	depends on !PREEMPT_RT
	depends on ARCH_NO_PREEMPT
	select PREEMPT_NONE_BUILD if !PREEMPT_DYNAMIC
	help
	  This is the traditional Linux preemption model, geared towards
	  throughput. It will still provide good latencies most of the
	  time, but there are no guarantees and occasional longer delays
	  are possible.

	  Select this option if you are building a kernel for a server or
	  scientific/computation system, or if you want to maximize the
	  raw processing power of the kernel, irrespective of scheduling
	  latencies.

config PREEMPT_VOLUNTARY
	bool "Voluntary Kernel Preemption (Desktop)"
	depends on !ARCH_HAS_PREEMPT_LAZY
	depends on !ARCH_NO_PREEMPT
	depends on !PREEMPT_RT
	select PREEMPT_VOLUNTARY_BUILD if !PREEMPT_DYNAMIC
	help
	  This option reduces the latency of the kernel by adding more
	  "explicit preemption points" to the kernel code. These new
	  preemption points have been selected to reduce the maximum
	  latency of rescheduling, providing faster application reactions,
	  at the cost of slightly lower throughput.

	  This allows reaction to interactive events by allowing a
	  low priority process to voluntarily preempt itself even if it
	  is in kernel mode executing a system call. This allows
	  applications to run more 'smoothly' even when the system is
	  under load.

	  Select this if you are building a kernel for a desktop system.

config PREEMPT
	bool "Preemptible Kernel (Low-Latency Desktop)"
	depends on !ARCH_NO_PREEMPT
	select PREEMPT_BUILD if !PREEMPT_DYNAMIC
	help
	  This option reduces the latency of the kernel by making
	  all kernel code (that is not executing in a critical section)
	  preemptible.  This allows reaction to interactive events by
	  permitting a low priority process to be preempted involuntarily
	  even if it is in kernel mode executing a system call and would
	  otherwise not be about to reach a natural preemption point.
	  This allows applications to run more 'smoothly' even when the

Annotation

Atlas domain: Core OS / Scheduler, Processes, Timers, Sync, And Syscalls.
Implementation status: atlas-only.

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.