lib/sys_info.c

File Facts

System

Linux kernel

Corpus path

lib/sys_info.c

Extension

.c

Size

3842 bytes

Lines

167

Domain

Kernel Services

Bucket

lib

Inferred role

Kernel Services: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

• Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/array_size.h
• linux/bitops.h
• linux/cleanup.h
• linux/console.h
• linux/log2.h
• linux/kernel.h
• linux/ftrace.h
• linux/nmi.h
• linux/sched/debug.h
• linux/string.h
• linux/sysctl.h
• linux/sys_info.h

Detected Declarations

• function sys_info_parse_param
• function sys_info_write_handler
• function sys_info_read_handler
• function for_each_set_bit
• function sysctl_sys_info_handler
• function sys_info_sysctl_init
• function __sys_info
• function sys_info
• module init sys_info_sysctl_init

Annotated Snippet

subsys_initcall(sys_info_sysctl_init);
#endif

static void __sys_info(unsigned long si_mask)
{
	if (si_mask & SYS_INFO_TASKS)
		show_state();

	if (si_mask & SYS_INFO_MEM)
		show_mem();

	if (si_mask & SYS_INFO_TIMERS)
		sysrq_timer_list_show();

	if (si_mask & SYS_INFO_LOCKS)
		debug_show_all_locks();

	if (si_mask & SYS_INFO_FTRACE)
		ftrace_dump(DUMP_ALL);

	if (si_mask & SYS_INFO_ALL_BT)
		trigger_all_cpu_backtrace();

	if (si_mask & SYS_INFO_BLOCKED_TASKS)
		show_state_filter(TASK_UNINTERRUPTIBLE);
}

void sys_info(unsigned long si_mask)
{
	__sys_info(si_mask ? : kernel_si_mask);
}

Annotation

• Immediate include surface: `linux/array_size.h`, `linux/bitops.h`, `linux/cleanup.h`, `linux/console.h`, `linux/log2.h`, `linux/kernel.h`, `linux/ftrace.h`, `linux/nmi.h`.
• Detected declarations: `function sys_info_parse_param`, `function sys_info_write_handler`, `function sys_info_read_handler`, `function for_each_set_bit`, `function sysctl_sys_info_handler`, `function sys_info_sysctl_init`, `function __sys_info`, `function sys_info`, `module init sys_info_sysctl_init`.
• Atlas domain: Kernel Services / lib.
• Implementation status: integration 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.