tools/testing/selftests/mm/hugetlb-soft-offline.c

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/mm/hugetlb-soft-offline.c

Extension

.c

Size

5443 bytes

Lines

229

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

• errno.h
• stdlib.h
• stdio.h
• string.h
• unistd.h
• linux/magic.h
• linux/memfd.h
• sys/mman.h
• sys/statfs.h
• sys/types.h
• kselftest.h

Detected Declarations

• function do_soft_offline
• function set_enable_soft_offline
• function read_nr_hugepages
• function create_hugetlbfs_file
• function test_soft_offline_common
• function main

Annotated Snippet

if (nr_hugepages_before != nr_hugepages_after + 1) {
			ksft_test_result_fail("MADV_SOFT_OFFLINE should reduced 1 hugepage\n");
			return;
		}
	} else {
		if (nr_hugepages_before != nr_hugepages_after) {
			ksft_test_result_fail("MADV_SOFT_OFFLINE reduced %lu hugepages\n",
				nr_hugepages_before - nr_hugepages_after);
			return;
		}
	}

	ksft_test_result(ret == 0,
			 "Test soft-offline when enabled_soft_offline=%d\n",
			 enable_soft_offline);
}

int main(int argc, char **argv)
{
	ksft_print_header();
	ksft_set_plan(2);

	test_soft_offline_common(1);
	test_soft_offline_common(0);

	ksft_finished();
}

Annotation

• Immediate include surface: `errno.h`, `stdlib.h`, `stdio.h`, `string.h`, `unistd.h`, `linux/magic.h`, `linux/memfd.h`, `sys/mman.h`.
• Detected declarations: `function do_soft_offline`, `function set_enable_soft_offline`, `function read_nr_hugepages`, `function create_hugetlbfs_file`, `function test_soft_offline_common`, `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.