Module heap

Structs§

KernelHeapFailureSnapshot
LockedHeap
SlabDiagSnapshot
SlabPageHeader 🔒: Header at the base of each 4 KiB page dedicated to a slab class.
SlabState 🔒: Per-size-class partial-page lists.

HEAP_POISON_ENABLED 🔒
MAX_SLAB_SIZE 🔒: Allocations with effective size above this threshold bypass the slab.
NUM_SLABS 🔒
POISON_BYTE 🔒: Byte pattern written to the body of freed slab blocks.
SLAB_CANARY 🔒: Canary word placed at the last 4 bytes of each slab block.
SLAB_HEADER_SIZE 🔒: Byte offset at which slab blocks begin within each slab page.
SLAB_NUM_CLASSES: Number of slab size classes.
SLAB_SIZES 🔒: Slab block sizes chosen to bound internal fragmentation to ~25% worst-case (average ~12%) instead of 50% with pure power-of-two classes.

HEAP_ALLOCATOR 🔒
LAST_HEAP_FAILURE 🔒
SLAB_ALLOC 🔒
SLAB_PAGES_ALLOCATED 🔒: Total buddy pages ever handed to the slab allocator.
SLAB_PAGES_RECLAIMED 🔒: Total buddy pages ever returned from the slab allocator (fully-empty reclaim).

alloc_error_handler 🔒: Allocates error handler.
alloc_kernel_heap^⚠: Compatibility facade over the current global kernel heap policy.
classify_kernel_heap_backend 🔒
dealloc_kernel_heap^⚠: Free memory previously returned by alloc_kernel_heap.
debug_register_slab_trace: Register slab lock for E9 trace (call from init).
debug_slab_lock_addr: Returns the slab lock address for deadlock tracing.
dump_diagnostics: Dump heap and buddy allocator diagnostics to the serial console.
last_heap_failure_snapshot
log_buddy_snapshot 🔒
log_common_oom_header 🔒
log_heap_failure_policy 🔒
record_heap_failure 🔒
slab_blocks_per_page: Number of blocks that fit in one buddy page for slab class ci.
slab_class_alignment: Guaranteed alignment in bytes for slab class ci.
slab_class_size: Block size in bytes for slab class ci.
slab_diag_snapshot
slab_page_in_partial_list: Returns whether the slab page at page_base is currently present in the partial-page list for class ci.
try_alloc_kernel_heap^⚠: Fallible heap entry point with explicit backend-aware errors.