mm/compaction.c

File Facts

System

Linux kernel

Corpus path

mm/compaction.c

Extension

.c

Size

95241 bytes

Lines

3357

Domain

Core OS

Bucket

Memory Management

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

• linux/cpu.h
• linux/swap.h
• linux/migrate.h
• linux/compaction.h
• linux/mm_inline.h
• linux/sched/signal.h
• linux/backing-dev.h
• linux/sysctl.h
• linux/sysfs.h
• linux/page-isolation.h
• linux/kasan.h
• linux/kthread.h
• linux/freezer.h
• linux/page_owner.h
• linux/psi.h
• linux/cpuset.h
• internal.h
• trace/events/compaction.h

Detected Declarations

• function count_compact_event
• function count_compact_events
• function is_via_compact_memory
• function is_via_compact_memory
• function release_free_list
• function list_for_each_entry_safe
• function defer_compaction
• function compaction_deferred
• function succeeded
• function compaction_restarting
• function isolation_suitable
• function reset_cached_positions
• function skip_offline_sections
• function skip_offline_sections_reverse
• function skip_offline_sections
• function skip_offline_sections_reverse
• function pageblock_skip_persistent
• function __reset_isolation_pfn
• function __reset_isolation_suitable
• function reset_isolation_suitable
• function test_and_set_skip
• function update_cached_migrate
• function update_pageblock_skip
• function isolation_suitable
• function pageblock_skip_persistent
• function update_pageblock_skip
• function compact_lock_irqsave
• function compact_folio_lruvec_lock_irqsave
• function need_resched
• function isolate_freepages_block
• function isolate_freepages_range
• function too_many_isolated
• function skip_isolation_on_order
• function isolate_migratepages_block
• function lock
• function isolate_or_dissolve_huge_folio
• function scanned
• function isolate_migratepages_range
• function suitable_migration_source
• function suitable_migration_target
• function freelist_scan_limit
• function compact_scanners_met
• function move_freelist_head
• function move_freelist_tail
• function fast_isolate_around
• function next_search_order
• function fast_isolate_freepages
• function list_for_each_entry_reverse

Annotated Snippet

subsys_initcall(kcompactd_init)

#endif /* CONFIG_COMPACTION */

Annotation

• Immediate include surface: `linux/cpu.h`, `linux/swap.h`, `linux/migrate.h`, `linux/compaction.h`, `linux/mm_inline.h`, `linux/sched/signal.h`, `linux/backing-dev.h`, `linux/sysctl.h`.
• Detected declarations: `function count_compact_event`, `function count_compact_events`, `function is_via_compact_memory`, `function is_via_compact_memory`, `function release_free_list`, `function list_for_each_entry_safe`, `function defer_compaction`, `function compaction_deferred`, `function succeeded`, `function compaction_restarting`.
• Atlas domain: Core OS / Memory Management.
• 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.