Function fastlogN

t/unit-tests/u-reftable-stack.c:935–943

}

static int fastlogN(uint64_t sz, uint64_t N)
{
	int l = 0;
	if (sz == 0)
		return 0;
	for (; sz; sz /= N)
		l++;
	return l - 1;
}

void test_reftable_stack__auto_compaction(void)
{