Documentation/tools/rtla/common_timerlat_description.txt
Source file repositories/reference/linux-study-clean/Documentation/tools/rtla/common_timerlat_description.txt
File Facts
- System
- Linux kernel
- Corpus path
Documentation/tools/rtla/common_timerlat_description.txt- Extension
.txt- Size
- 1010 bytes
- Lines
- 19
- Domain
- Support Tooling And Documentation
- Bucket
- Documentation
- Inferred role
- Support Tooling And Documentation: documentation
- Status
- atlas-only
Why This File Exists
Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
- Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
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
The **rtla timerlat** tool is an interface for the *timerlat* tracer. The
*timerlat* tracer dispatches a kernel thread per-cpu. These threads
set a periodic timer to wake themselves up and go back to sleep. After
the wakeup, they collect and generate useful information for the
debugging of operating system timer latency.
The *timerlat* tracer outputs information in two ways. It periodically
prints the timer latency at the timer *IRQ* handler and the *Thread*
handler. It also enables the trace of the most relevant information via
**osnoise:** tracepoints.
The **rtla timerlat** tool sets the options of the *timerlat* tracer
and collects and displays a summary of the results. By default,
the collection is done synchronously in kernel space using a dedicated
BPF program attached to the *timerlat* tracer. If either BPF or
the **osnoise:timerlat_sample** tracepoint it attaches to is
unavailable, the **rtla timerlat** tool falls back to using tracefs to
process the data asynchronously in user space.Annotation
- Atlas domain: Support Tooling And Documentation / Documentation.
- 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.