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mark-sweep: add global small object freelist

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This will be useful to collect data when sweeping, if a mutator doesn't
need those objects.
This commit is contained in:
Andy Wingo 2022-03-29 10:07:24 +02:00
parent 2d1e76eccc
commit 14529f11e9
1 changed files with 25 additions and 3 deletions
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28
mark-sweep.h
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@ -102,6 +102,7 @@ struct gcobj {
};
struct mark_space {
struct gcobj_freelists small_objects;
// Unordered list of large objects.
struct gcobj_free_large *large_objects;
uintptr_t base;
@ -199,6 +200,7 @@ static void clear_mutator_freelists(struct mutator *mut) {
clear_small_freelists(&mut->small_objects);
}
static void clear_global_freelists(struct mark_space *space) {
clear_small_freelists(&space->small_objects);
space->large_objects = NULL;
}
@ -511,6 +513,24 @@ static int fill_small_from_large(struct mark_space *space,
return 1;
}
static int fill_small_from_global_small(struct mark_space *space,
struct gcobj_freelists *small_objects,
enum small_object_size kind) {
struct gcobj_freelists *global_small = &space->small_objects;
if (*get_small_object_freelist(global_small, kind)
|| fill_small_from_local(global_small, kind)) {
struct gcobj_free **src = get_small_object_freelist(global_small, kind);
ASSERT(*src);
struct gcobj_free **dst = get_small_object_freelist(small_objects, kind);
ASSERT(!*dst);
// FIXME: just take a few?
*dst = *src;
*src = NULL;
return 1;
}
return 0;
}
static void fill_small_from_global(struct mutator *mut,
enum small_object_size kind) NEVER_INLINE;
static void fill_small_from_global(struct mutator *mut,
@ -520,6 +540,9 @@ static void fill_small_from_global(struct mutator *mut,
int swept_from_beginning = 0;
while (1) {
if (fill_small_from_global_small(space, small_objects, kind))
break;
if (fill_small_from_large(space, small_objects, kind))
break;
@ -648,7 +671,6 @@ static inline void print_start_gc_stats(struct heap *heap) {
}
static inline void print_end_gc_stats(struct heap *heap) {
struct mark_space *space = heap_mark_space(heap);
printf("Completed %ld collections\n", space->count);
printf("Heap size with overhead is %zd\n", space->mem_size);
printf("Completed %ld collections\n", heap_mark_space(heap)->count);
printf("Heap size with overhead is %zd\n", heap_mark_space(heap)->mem_size);
}