tools/testing/selftests/ftrace/test.d/00basic/snapshot.tc

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/ftrace/test.d/00basic/snapshot.tc

Extension

.tc

Size

521 bytes

Lines

28

Domain

Support Tooling And Documentation

Bucket

tools

Inferred role

Support Tooling And Documentation: tools

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

#!/bin/sh
# description: Snapshot and tracing setting
# requires: snapshot
# flags: instance

echo "Set tracing off"
echo 0 > tracing_on

echo "Allocate and take a snapshot"
echo 1 > snapshot

# Since trace buffer is empty, snapshot is also empty, but allocated
grep -q "Snapshot is allocated" snapshot

echo "Ensure keep tracing off"
test `cat tracing_on` -eq 0

echo "Set tracing on"
echo 1 > tracing_on

echo "Take a snapshot again"
echo 1 > snapshot

echo "Ensure keep tracing on"
test `cat tracing_on` -eq 1

exit 0

Annotation

• Atlas domain: Support Tooling And Documentation / tools.
• 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.