tools/testing/selftests/sched_ext/select_cpu_dfl.bpf.c

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/sched_ext/select_cpu_dfl.bpf.c

Extension

.c

Size

1039 bytes

Lines

41

Domain

Support Tooling And Documentation

Bucket

tools

Inferred role

Support Tooling And Documentation: implementation source

Status

source implementation candidate

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

Dependency Surface

• scx/common.bpf.h

Detected Declarations

• function task_is_test
• function BPF_STRUCT_OPS

Annotated Snippet

bpf_cpumask_test_cpu(scx_bpf_task_cpu(p), idle_mask)) {
		saw_local = true;
	}
	scx_bpf_put_idle_cpumask(idle_mask);

	scx_bpf_dsq_insert(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, enq_flags);
}

SEC(".struct_ops.link")
struct sched_ext_ops select_cpu_dfl_ops = {
	.enqueue		= (void *) select_cpu_dfl_enqueue,
	.name			= "select_cpu_dfl",
};

Annotation

• Immediate include surface: `scx/common.bpf.h`.
• Detected declarations: `function task_is_test`, `function BPF_STRUCT_OPS`.
• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: source 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.