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Use “real-time Linux” and PREEMPT_RT precisely
Use real-time Linux as a general descriptive phrase for Linux systems and work concerned with timing behavior. Use PREEMPT_RT, retaining its capitalization and underscore, when referring to the kernel feature or configuration described in the Linux kernel’s real-time preemption documentation. Not every Linux system used for time-sensitive work necessarily runs PREEMPT_RT.
When comparing systems, name the actual kernel and configuration rather than treating “real-time” as a product label that explains implementation. The kernel documentation distinguishes PREEMPT_RT configurations from non-PREEMPT_RT configurations and discusses relevant behavior and hardware or architecture considerations.
Explain what PREEMPT_RT changes
PREEMPT_RT aims to reduce scheduling latency by making more kernel execution paths preemptible. It uses forced-threaded interrupts and sleeping spin locks, moving work that could previously delay scheduling into process context. As the kernel documentation puts it: “With forced-threaded interrupts and sleeping spin locks, code paths that previously caused long scheduling latencies have been made preemptible and moved into process context.”
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This is a mechanism-level explanation, not a promise that every application will meet a deadline. A claim that a complete system satisfies a timing requirement needs evidence for that particular hardware, kernel configuration, workload, application, and measurement conditions. Do not add a latency number, benchmark, or percentage improvement unless a source establishes the figure and how it was measured.
Keep scheduling, priority, latency, and deadlines distinct
These terms describe related but different things. Scheduling policy determines how a task competes for processor time; priority affects that competition under applicable policies; latency is delay in responding or beginning work; and a deadline is a required completion time. “Real-time” does not simply mean “fast,” and choosing a scheduler policy does not by itself prove a system-level timing guarantee.
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For example, the Linux scheduler supports policies such as SCHED_FIFO, documented in the scheduler manual. Mentioning a policy is not a substitute for describing the task priorities, system configuration, workload, and evidence relevant to an application’s timing claim.
Account for changed kernel programming assumptions
PREEMPT_RT changes assumptions that may hold in a non-RT configuration. When writing for kernel developers or describing code behavior, verify the relevant documentation rather than carrying over non-RT expectations without qualification. Areas to check include:
- Execution contexts and threaded interrupt handling.
- Softirq behavior and timers.
- Locking behavior, including sleeping locks.
- Protection of per-CPU data.
- Memory allocation in non-preemptible contexts.
These are substantive behavioral differences, not just naming distinctions. Avoid suggesting that a code path behaves identically across configurations unless the relevant kernel documentation supports that statement.
Use inclusive, accurate kernel terminology
For new kernel symbols and documentation, avoid introducing “master/slave” or “blacklist/whitelist.” Choose a replacement that describes the actual relationship. The kernel terminology guidance offers alternatives such as:
primary/secondaryinitiator/requestercontroller/hostleader/followerdenylist/allowlistblocklist/passlist
Do not mechanically swap terms if the replacement misstates the design. The kernel guide also describes cases where existing userspace ABI/API terminology or language required by a specification must be preserved.
Apply kernel coding conventions to code—not marketing typography
When reproducing or discussing kernel code, follow the kernel’s own conventions. Its coding-style guide specifies 8-character indentation and prefers an 80-column line length, while allowing stated exceptions for readability. These are conventions for kernel code; they do not prescribe typography, indentation, or line length for general editorial copy.
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Make comparisons specific and measurable
A useful comparison between a PREEMPT_RT and non-PREEMPT_RT system identifies the conditions that could explain differences, rather than declaring one universally “faster.” Include the kernel version and configuration, hardware and architecture, interrupt and timer behavior, scheduler policy and task priorities, application workload, and measured latency with its test conditions. Without those details, a broad performance claim is not well established.
What this guide does—and does not—establish
The official kernel sources support precise discussion of PREEMPT_RT behavior and kernel coding conventions. They do not define a corporate brand identity for “Real-Time Linux.” Do not present a logo, color palette, typeface, trademark rule, product positioning, or vendor-specific claim as official without separate authority for it.
Likewise, kernel documentation about preemption behavior is not proof that a complete system meets a specified deadline. Such a claim requires system-specific configuration and measurement evidence. No particular hardware product, book, tool, or service is established by these sources as a required recommendation for this editorial guide.
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