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Fix semi-space with fixed-sized heaps

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This commit is contained in:
Andy Wingo 2024-09-16 15:06:50 +02:00
parent 506b4187fc
commit 2b59efd9fc
1 changed files with 19 additions and 13 deletions
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32
src/semi.c
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@ -322,6 +322,11 @@ static void resize_heap(struct gc_heap *heap, size_t new_heap_size) {
heap->size = new_region_size * 2;
if (heap->size != old_heap_size)
HEAP_EVENT(heap, heap_resized, heap->size);
}
static void reset_heap_limits(struct gc_heap *heap) {
struct semi_space *semi = heap_semi_space(heap);
size_t new_region_size = align_up(heap->size, semi->page_size * 2) / 2;
size_t stolen = align_up(semi->stolen_pages, 2) * semi->page_size;
GC_ASSERT(new_region_size > stolen/2);
size_t new_active_region_size = new_region_size - stolen/2;
@ -416,6 +421,7 @@ static void collect(struct gc_mutator *mut, size_t for_alloc) {
heap->size);
gc_heap_sizer_on_gc(heap->sizer, heap->size, live_size, pause_ns,
resize_heap);
reset_heap_limits(heap);
HEAP_EVENT(heap, restarting_mutators);
// fprintf(stderr, "%zd bytes copied\n", (space->size>>1)-(space->limit-space->hp));
@ -578,6 +584,14 @@ unsigned gc_heap_ephemeron_trace_epoch(struct gc_heap *heap) {
return heap->count;
}
static uint64_t get_allocation_counter(struct gc_heap *heap) {
return heap->total_allocated_bytes_at_last_gc;
}
static void ignore_async_heap_size_adjustment(struct gc_heap *heap,
size_t size) {
}
static int heap_init(struct gc_heap *heap, const struct gc_options *options) {
heap->extern_space = NULL;
heap->pending_ephemerons_size_factor = 0.01;
@ -590,6 +604,11 @@ static int heap_init(struct gc_heap *heap, const struct gc_options *options) {
if (!heap->finalizer_state)
GC_CRASH();
heap->sizer = gc_make_heap_sizer(heap, &options->common,
get_allocation_counter,
ignore_async_heap_size_adjustment,
NULL);
return heap_prepare_pending_ephemerons(heap);
}
@ -617,14 +636,6 @@ int gc_options_parse_and_set(struct gc_options *options, int option,
return gc_common_options_parse_and_set(&options->common, option, value);
}
static uint64_t get_allocation_counter(struct gc_heap *heap) {
return heap->total_allocated_bytes_at_last_gc;
}
static void ignore_async_heap_size_adjustment(struct gc_heap *heap,
size_t size) {
}
int gc_init(const struct gc_options *options, struct gc_stack_addr *stack_base,
struct gc_heap **heap, struct gc_mutator **mut,
struct gc_event_listener event_listener,
@ -655,11 +666,6 @@ int gc_init(const struct gc_options *options, struct gc_stack_addr *stack_base,
if (!large_object_space_init(heap_large_object_space(*heap), *heap))
return 0;
(*heap)->sizer = gc_make_heap_sizer(*heap, &options->common,
get_allocation_counter,
ignore_async_heap_size_adjustment,
NULL);
// Ignore stack base, as we are precise.
(*mut)->roots = NULL;