aggsum_compare
ASSERT(aggsum_compare(&arc_meta_used, space) >= 0);
ASSERT(aggsum_compare(&arc_size, space) >= 0);
if (aggsum_compare(&arc_meta_used, arc_meta_limit) >= 0) {
evicted > 0 && aggsum_compare(&arc_size, arc_c) > 0;
if (aggsum_compare(&arc_size, arc_c - (2ULL << SPA_MAXBLOCKSHIFT)) >
if (aggsum_compare(&arc_size, arc_c) < 0 &&
int aggsum_compare(aggsum_t *, uint64_t);