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mmc: Tail-call an out-of-memory handler if allocation fails

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This commit is contained in:
Andy Wingo 2025-04-23 11:31:15 +02:00
parent a0148d4b38
commit 1e41f0e093
2 changed files with 48 additions and 36 deletions
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79
src/mmc.c
View file

@ -66,6 +66,7 @@ struct gc_heap {
struct gc_heap_sizer sizer;
struct gc_event_listener event_listener;
void *event_listener_data;
void* (*allocation_failure)(struct gc_heap*, size_t);
};
#define HEAP_EVENT(heap, event, ...) do { \
@ -511,20 +512,18 @@ heap_estimate_live_data_after_gc(struct gc_heap *heap,
return bytes;
}
static void
detect_out_of_memory(struct gc_heap *heap, uintptr_t allocation_since_last_gc) {
if (heap->sizer.policy != GC_HEAP_SIZE_FIXED)
return;
static int
compute_progress(struct gc_heap *heap, uintptr_t allocation_since_last_gc) {
struct nofl_space *nofl = heap_nofl_space(heap);
return allocation_since_last_gc > nofl_space_fragmentation(nofl);
}
if (allocation_since_last_gc > nofl_space_fragmentation(heap_nofl_space(heap)))
return;
if (heap->gc_kind == GC_COLLECTION_MINOR)
return;
// No allocation since last gc: out of memory.
fprintf(stderr, "ran out of space, heap size %zu\n", heap->size);
GC_CRASH();
static int
compute_success(struct gc_heap *heap, enum gc_collection_kind gc_kind,
int progress) {
return progress
|| gc_kind == GC_COLLECTION_MINOR
|| heap->sizer.policy != GC_HEAP_SIZE_FIXED;
}
static double
@ -750,12 +749,10 @@ sweep_ephemerons(struct gc_heap *heap) {
return gc_sweep_pending_ephemerons(heap->pending_ephemerons, 0, 1);
}
static void collect(struct gc_mutator *mut,
enum gc_collection_kind requested_kind,
int requested_by_user) GC_NEVER_INLINE;
static void
collect(struct gc_mutator *mut, enum gc_collection_kind requested_kind,
int requested_by_user) {
static int collect(struct gc_mutator *mut,
enum gc_collection_kind requested_kind) GC_NEVER_INLINE;
static int
collect(struct gc_mutator *mut, enum gc_collection_kind requested_kind) {
struct gc_heap *heap = mutator_heap(mut);
struct nofl_space *nofl_space = heap_nofl_space(heap);
struct large_object_space *lospace = heap_large_object_space(heap);
@ -773,8 +770,7 @@ collect(struct gc_mutator *mut, enum gc_collection_kind requested_kind,
nofl_space_add_to_allocation_counter(nofl_space, &allocation_counter);
large_object_space_add_to_allocation_counter(lospace, &allocation_counter);
heap->total_allocated_bytes_at_last_gc += allocation_counter;
if (!requested_by_user)
detect_out_of_memory(heap, allocation_counter);
int progress = compute_progress(heap, allocation_counter);
enum gc_collection_kind gc_kind =
determine_collection_kind(heap, requested_kind);
int is_minor = gc_kind == GC_COLLECTION_MINOR;
@ -821,12 +817,12 @@ collect(struct gc_mutator *mut, enum gc_collection_kind requested_kind,
heap->size_at_last_gc = heap->size;
HEAP_EVENT(heap, restarting_mutators);
allow_mutators_to_continue(heap);
return compute_success(heap, gc_kind, progress);
}
static void
static int
trigger_collection(struct gc_mutator *mut,
enum gc_collection_kind requested_kind,
int requested_by_user) {
enum gc_collection_kind requested_kind) {
struct gc_heap *heap = mutator_heap(mut);
int prev_kind = -1;
gc_stack_capture_hot(&mut->stack);
@ -836,14 +832,16 @@ trigger_collection(struct gc_mutator *mut,
heap_lock(heap);
while (mutators_are_stopping(heap))
prev_kind = pause_mutator_for_collection(heap, mut);
int success = 1;
if (prev_kind < (int)requested_kind)
collect(mut, requested_kind, requested_by_user);
success = collect(mut, requested_kind);
heap_unlock(heap);
return success;
}
void
gc_collect(struct gc_mutator *mut, enum gc_collection_kind kind) {
trigger_collection(mut, kind, 1);
trigger_collection(mut, kind);
}
int*
@ -903,8 +901,10 @@ allocate_large(struct gc_mutator *mut, size_t size,
nofl_space_request_release_memory(nofl_space,
npages << lospace->page_size_log2);
while (!nofl_space_shrink(nofl_space, 0))
trigger_collection(mut, GC_COLLECTION_COMPACTING, 0);
while (!nofl_space_shrink(nofl_space, 0)) {
if (!trigger_collection(mut, GC_COLLECTION_COMPACTING))
return heap->allocation_failure(heap, size);
}
atomic_fetch_add(&heap->large_object_pages, npages);
void *ret = large_object_space_alloc(lospace, npages, kind);
@ -919,7 +919,7 @@ allocate_large(struct gc_mutator *mut, size_t size,
static void
collect_for_small_allocation(void *mut) {
trigger_collection(mut, GC_COLLECTION_ANY, 0);
trigger_collection(mut, GC_COLLECTION_ANY);
}
void*
@ -930,10 +930,16 @@ gc_allocate_slow(struct gc_mutator *mut, size_t size,
if (size > gc_allocator_large_threshold())
return allocate_large(mut, size, compute_trace_kind(kind));
return gc_ref_heap_object(nofl_allocate(&mut->allocator,
heap_nofl_space(mutator_heap(mut)),
size, collect_for_small_allocation,
mut, kind));
struct gc_heap *heap = mutator_heap(mut);
while (1) {
struct gc_ref ret = nofl_allocate(&mut->allocator, heap_nofl_space(heap),
size, kind);
if (!gc_ref_is_null(ret))
return gc_ref_heap_object(ret);
if (trigger_collection(mut, GC_COLLECTION_ANY))
continue;
return heap->allocation_failure(heap, size);
}
}
void
@ -1109,6 +1115,12 @@ static void set_heap_size_from_thread(struct gc_heap *heap, size_t size) {
pthread_mutex_unlock(&heap->lock);
}
static void* allocation_failure(struct gc_heap *heap, size_t size) {
fprintf(stderr, "ran out of space, heap size %zu\n", heap->size);
GC_CRASH();
return NULL;
}
static int
heap_init(struct gc_heap *heap, const struct gc_options *options) {
// *heap is already initialized to 0.
@ -1143,6 +1155,7 @@ heap_init(struct gc_heap *heap, const struct gc_options *options) {
allocation_counter_from_thread,
set_heap_size_from_thread,
heap->background_thread);
heap->allocation_failure = allocation_failure;
return 1;
}

5
src/nofl-space.h
View file

@ -880,8 +880,7 @@ nofl_allocator_next_hole(struct nofl_allocator *alloc,
static struct gc_ref
nofl_allocate(struct nofl_allocator *alloc, struct nofl_space *space,
size_t size, void (*gc)(void*), void *gc_data,
enum gc_allocation_kind kind) {
size_t size, enum gc_allocation_kind kind) {
GC_ASSERT(size > 0);
GC_ASSERT(size <= gc_allocator_large_threshold());
size = align_up(size, NOFL_GRANULE_SIZE);
@ -894,7 +893,7 @@ nofl_allocate(struct nofl_allocator *alloc, struct nofl_space *space,
break;
}
if (!hole)
gc(gc_data);
return gc_ref_null();
}
}