kernel/power/swap.c

File Facts

System

Linux kernel

Corpus path

kernel/power/swap.c

Extension

.c

Size

41523 bytes

Lines

1711

Domain

Core OS

Bucket

Scheduler, Processes, Timers, Sync, And Syscalls

Inferred role

Core OS: exported/initcall integration point

Status

integration 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• 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

• crypto/acompress.h
• linux/module.h
• linux/file.h
• linux/delay.h
• linux/bitops.h
• linux/device.h
• linux/bio.h
• linux/blkdev.h
• linux/swap.h
• linux/swapops.h
• linux/pm.h
• linux/slab.h
• linux/vmalloc.h
• linux/cpumask.h
• linux/atomic.h
• linux/kthread.h
• linux/crc32.h
• linux/ktime.h
• power.h

Detected Declarations

• struct swap_map_page
• struct swap_map_page_list
• struct swap_map_handle
• struct swsusp_header
• struct swsusp_extent
• struct hib_bio_batch
• struct crc_data
• struct cmp_data
• struct dec_data
• function low_free_pages
• function reqd_free_pages
• function swsusp_extents_insert
• function alloc_swapdev_block
• function free_all_swap_pages
• function swsusp_swap_in_use
• function hib_init_batch
• function hib_finish_batch
• function hib_end_io
• function hib_submit_io_sync
• function hib_submit_io_async
• function hib_wait_io
• function mark_swapfiles
• function swsusp_swap_check
• function write_page
• function release_swap_writer
• function get_swap_writer
• function swap_write_page
• function flush_swap_writer
• function swap_writer_finish
• function save_image
• function free_crc_data
• function crc32_threadfn
• function compress_threadfn
• function save_compressed_image
• function enough_swap
• function synced
• function release_swap_reader
• function get_swap_reader
• function swap_read_page
• function swap_reader_finish
• function load_image
• function decompress_threadfn
• function load_compressed_image
• function swsusp_read
• function swsusp_check
• function swsusp_close
• function swsusp_unmark
• function hibernate_compression_threads_show

Annotated Snippet

core_initcall(swsusp_header_init);

static int __init hibernate_compression_threads_setup(char *str)
{
	int rc = kstrtouint(str, 0, &hibernate_compression_threads);

	if (rc)
		return rc;

	if (hibernate_compression_threads < 1)
		hibernate_compression_threads = CMP_THREADS;

	return 1;

}

__setup("hibernate_compression_threads=", hibernate_compression_threads_setup);

Annotation

• Immediate include surface: `crypto/acompress.h`, `linux/module.h`, `linux/file.h`, `linux/delay.h`, `linux/bitops.h`, `linux/device.h`, `linux/bio.h`, `linux/blkdev.h`.
• Detected declarations: `struct swap_map_page`, `struct swap_map_page_list`, `struct swap_map_handle`, `struct swsusp_header`, `struct swsusp_extent`, `struct hib_bio_batch`, `struct crc_data`, `struct cmp_data`, `struct dec_data`, `function low_free_pages`.
• Atlas domain: Core OS / Scheduler, Processes, Timers, Sync, And Syscalls.
• Implementation status: integration 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.