There is also the case of the sum of the allocations of several malloc operations exceeding that threshold. The case of just 1 malloc operation being that large

There is also the case of the sum of the allocations of several malloc operations exceeding that threshold. The case of just 1 malloc operation being that large is just a special case of that. That is what I meant, but reading what Ibwrore made me realize that I was not clear about that.