arch/x86/events/rapl.c

File Facts

System

Linux kernel

Corpus path

arch/x86/events/rapl.c

Extension

.c

Size

27974 bytes

Lines

966

Domain

Architecture Layer

Bucket

arch/x86

Inferred role

Architecture Layer: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• 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/module.h
• linux/slab.h
• linux/perf_event.h
• linux/nospec.h
• asm/cpu_device_id.h
• asm/intel-family.h
• asm/msr.h
• perf_event.h
• probe.h

Detected Declarations

• struct rapl_pmu
• struct rapl_pmus
• struct rapl_model
• enum perf_rapl_pkg_events
• enum rapl_unit_quirk
• function get_rapl_pmu_idx
• function rapl_read_counter
• function rapl_scale
• function rapl_event_update
• function rapl_start_hrtimer
• function rapl_hrtimer_handle
• function rapl_hrtimer_init
• function __rapl_pmu_event_start
• function rapl_pmu_event_start
• function rapl_pmu_event_stop
• function rapl_pmu_event_add
• function rapl_pmu_event_del
• function rapl_pmu_event_init
• function rapl_pmu_event_read
• function test_msr
• function rapl_check_hw_unit
• function rapl_advertise
• function cleanup_rapl_pmus
• function init_rapl_pmu
• function init_rapl_pmus
• function rapl_pmu_init
• function intel_rapl_exit
• module init rapl_pmu_init

Annotated Snippet

module_init(rapl_pmu_init);

static void __exit intel_rapl_exit(void)
{
	if (rapl_pmus_core) {
		perf_pmu_unregister(&rapl_pmus_core->pmu);
		cleanup_rapl_pmus(rapl_pmus_core);
	}
	perf_pmu_unregister(&rapl_pmus_pkg->pmu);
	cleanup_rapl_pmus(rapl_pmus_pkg);
}
module_exit(intel_rapl_exit);

Annotation

• Immediate include surface: `linux/module.h`, `linux/slab.h`, `linux/perf_event.h`, `linux/nospec.h`, `asm/cpu_device_id.h`, `asm/intel-family.h`, `asm/msr.h`, `perf_event.h`.
• Detected declarations: `struct rapl_pmu`, `struct rapl_pmus`, `struct rapl_model`, `enum perf_rapl_pkg_events`, `enum rapl_unit_quirk`, `function get_rapl_pmu_idx`, `function rapl_read_counter`, `function rapl_scale`, `function rapl_event_update`, `function rapl_start_hrtimer`.
• Atlas domain: Architecture Layer / arch/x86.
• 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.