fs/proc/task_nommu.c

File Facts

System

Linux kernel

Corpus path

fs/proc/task_nommu.c

Extension

.c

Size

6575 bytes

Lines

297

Domain

Core OS

Bucket

VFS And Filesystem Core

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

Dependency Surface

• linux/mm.h
• linux/file.h
• linux/fdtable.h
• linux/fs_struct.h
• linux/mount.h
• linux/ptrace.h
• linux/slab.h
• linux/seq_file.h
• linux/sched/mm.h
• internal.h

Detected Declarations

• function task_mem
• function task_vsize
• function task_statm
• function nommu_vma_show
• function show_map
• function m_stop
• function maps_open
• function map_release
• function pid_maps_open

Annotated Snippet

const struct file_operations proc_pid_maps_operations = {
	.open		= pid_maps_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= map_release,
};

Annotation

• Immediate include surface: `linux/mm.h`, `linux/file.h`, `linux/fdtable.h`, `linux/fs_struct.h`, `linux/mount.h`, `linux/ptrace.h`, `linux/slab.h`, `linux/seq_file.h`.
• Detected declarations: `function task_mem`, `function task_vsize`, `function task_statm`, `function nommu_vma_show`, `function show_map`, `function m_stop`, `function maps_open`, `function map_release`, `function pid_maps_open`.
• Atlas domain: Core OS / VFS And Filesystem Core.
• 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.