kernel/trace/trace_recursion_record.c

File Facts

System

Linux kernel

Corpus path

kernel/trace/trace_recursion_record.c

Extension

.c

Size

6094 bytes

Lines

232

Domain

Core OS

Bucket

Scheduler, Processes, Timers, Sync, And Syscalls

Inferred role

Core OS: operation-table or driver-model contract

Status

pattern implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• 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/seq_file.h
• linux/kallsyms.h
• linux/module.h
• linux/ftrace.h
• linux/fs.h
• trace_output.h

Detected Declarations

• struct recursed_functions
• function ftrace_record_recursion
• function recursed_function_seq_stop
• function recursed_function_seq_show
• function recursed_function_open
• function recursed_function_write
• function recursed_function_release
• function create_recursed_functions
• module init create_recursed_functions
• export ftrace_record_recursion

Annotated Snippet

static const struct file_operations recursed_functions_fops = {
	.open           = recursed_function_open,
	.write		= recursed_function_write,
	.read           = seq_read,
	.llseek         = seq_lseek,
	.release        = recursed_function_release,
};

__init static int create_recursed_functions(void)
{

	trace_create_file("recursed_functions", TRACE_MODE_WRITE,
			  NULL, NULL, &recursed_functions_fops);
	return 0;
}

fs_initcall(create_recursed_functions);

Annotation

• Immediate include surface: `linux/seq_file.h`, `linux/kallsyms.h`, `linux/module.h`, `linux/ftrace.h`, `linux/fs.h`, `trace_output.h`.
• Detected declarations: `struct recursed_functions`, `function ftrace_record_recursion`, `function recursed_function_seq_stop`, `function recursed_function_seq_show`, `function recursed_function_open`, `function recursed_function_write`, `function recursed_function_release`, `function create_recursed_functions`, `module init create_recursed_functions`, `export ftrace_record_recursion`.
• Atlas domain: Core OS / Scheduler, Processes, Timers, Sync, And Syscalls.
• Implementation status: pattern implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.