tools/testing/selftests/seccomp/seccomp_benchmark.c

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/seccomp/seccomp_benchmark.c

Extension

.c

Size

8510 bytes

Lines

307

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

• assert.h
• err.h
• limits.h
• sched.h
• stdbool.h
• stddef.h
• stdio.h
• stdlib.h
• time.h
• unistd.h
• linux/filter.h
• linux/seccomp.h
• sys/param.h
• sys/prctl.h
• sys/syscall.h
• sys/types.h
• kselftest.h

Detected Declarations

• function timing
• function calibrate
• function approx
• function le
• function compare
• function affinity
• function main

Annotated Snippet

if (var > INT_MAX) {				\
			skip = true;				\
			ret |= 1;				\
		}						\
	} while (0)

	ESTIMATE("total seccomp overhead for 1 bitmapped filter", calc,
		 bitmap1 - native);
	ESTIMATE("total seccomp overhead for 2 bitmapped filters", calc,
		 bitmap2 - native);
	ESTIMATE("total seccomp overhead for 3 full filters", calc,
		 filter1 - native);
	ESTIMATE("total seccomp overhead for 4 full filters", calc,
		 filter2 - native);
	ESTIMATE("seccomp entry overhead", entry,
		 bitmap1 - native - (bitmap2 - bitmap1));
	ESTIMATE("seccomp per-filter overhead (last 2 diff)", per_filter1,
		 filter2 - filter1);
	ESTIMATE("seccomp per-filter overhead (filters / 4)", per_filter2,
		 (filter2 - native - entry) / 4);

	ksft_print_msg("Expectations:\n");
	ret |= compare("native", "≤", "1 bitmap", native, le, bitmap1,
		       skip);
	bits = compare("native", "≤", "1 filter", native, le, filter1,
		       skip);
	if (bits)
		skip = true;

	ret |= compare("per-filter (last 2 diff)", "≈", "per-filter (filters / 4)",
		       per_filter1, approx, per_filter2, skip);

	bits = compare("1 bitmapped", "≈", "2 bitmapped",
		       bitmap1 - native, approx, bitmap2 - native, skip);
	if (bits) {
		ksft_print_msg("Skipping constant action bitmap expectations: they appear unsupported.\n");
		skip = true;
	}

	ret |= compare("entry", "≈", "1 bitmapped", entry, approx,
		       bitmap1 - native, skip);
	ret |= compare("entry", "≈", "2 bitmapped", entry, approx,
		       bitmap2 - native, skip);
	ret |= compare("native + entry + (per filter * 4)", "≈", "4 filters total",
		       entry + (per_filter1 * 4) + native, approx, filter2,
		       skip);

	if (ret)
		ksft_print_msg("Saw unexpected benchmark result. Try running again with more samples?\n");

	ksft_finished();
}

Annotation

• Immediate include surface: `assert.h`, `err.h`, `limits.h`, `sched.h`, `stdbool.h`, `stddef.h`, `stdio.h`, `stdlib.h`.
• Detected declarations: `function timing`, `function calibrate`, `function approx`, `function le`, `function compare`, `function affinity`, `function main`.
• 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.