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Optimize computation of size class from small object granule count

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This commit is contained in:
Andy Wingo 2022-03-10 11:31:55 +01:00
parent cfa7ea31ae
commit c612ff3825
1 changed files with 22 additions and 5 deletions
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27
mark-sweep.h
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@ -36,12 +36,21 @@ static const uint8_t small_object_granule_sizes[] =
#undef SMALL_OBJECT_GRANULE_SIZE
};
static const enum small_object_size small_object_sizes_for_granules[LARGE_OBJECT_GRANULE_THRESHOLD + 1] = {
NOT_SMALL_OBJECT, NOT_SMALL_OBJECT, SMALL_OBJECT_2, SMALL_OBJECT_3,
SMALL_OBJECT_4, SMALL_OBJECT_5, SMALL_OBJECT_6, SMALL_OBJECT_8,
SMALL_OBJECT_8, SMALL_OBJECT_10, SMALL_OBJECT_10, SMALL_OBJECT_16,
SMALL_OBJECT_16, SMALL_OBJECT_16, SMALL_OBJECT_16, SMALL_OBJECT_16,
SMALL_OBJECT_16, SMALL_OBJECT_32, SMALL_OBJECT_32, SMALL_OBJECT_32,
SMALL_OBJECT_32, SMALL_OBJECT_32, SMALL_OBJECT_32, SMALL_OBJECT_32,
SMALL_OBJECT_32, SMALL_OBJECT_32, SMALL_OBJECT_32, SMALL_OBJECT_32,
SMALL_OBJECT_32, SMALL_OBJECT_32, SMALL_OBJECT_32, SMALL_OBJECT_32,
SMALL_OBJECT_32
};
static enum small_object_size granules_to_small_object_size(unsigned granules) {
if (granules <= 1) return NOT_SMALL_OBJECT;
#define TEST_GRANULE_SIZE(i) if (granules <= i) return SMALL_OBJECT_##i;
FOR_EACH_SMALL_OBJECT_GRANULES(TEST_GRANULE_SIZE);
#undef TEST_GRANULE_SIZE
return NOT_SMALL_OBJECT;
ASSERT(granules <= LARGE_OBJECT_GRANULE_THRESHOLD);
return small_object_sizes_for_granules[granules];
}
static uintptr_t align_up(uintptr_t addr, size_t align) {
@ -494,6 +503,14 @@ static inline void* get_field(void **addr) {
}
static inline void initialize_gc(struct context *cx, size_t size) {
#define SMALL_OBJECT_GRANULE_SIZE(i) \
ASSERT_EQ(SMALL_OBJECT_##i, small_object_sizes_for_granules[i]);
FOR_EACH_SMALL_OBJECT_GRANULES(SMALL_OBJECT_GRANULE_SIZE);
#undef SMALL_OBJECT_GRANULE_SIZE
ASSERT_EQ(SMALL_OBJECT_SIZES - 1,
small_object_sizes_for_granules[LARGE_OBJECT_GRANULE_THRESHOLD]);
size = align_up(size, getpagesize());
void *mem = mmap(NULL, size, PROT_READ|PROT_WRITE,