Re: [PATCH v3] range-diff: add configurable memory limit for cost matrix

> On Fri, Aug 29, 2025 at 4:00 AM Paulo Casaretto via GitGitGadget
> <gitgitgadget@gmail.com> wrote:
>> -
>> -       ALLOC_ARRAY(cost, st_mult(n, n));
>> +       size_t cost_size = st_mult(n, n);
>> +       size_t cost_bytes = st_mult(sizeof(int), cost_size);
>> +       if (cost_bytes >= max_memory) {
>> +               struct strbuf cost_str = STRBUF_INIT;
>> +               struct strbuf max_str = STRBUF_INIT;
>> +               strbuf_humanise_bytes(&cost_str, cost_bytes);
>> +               strbuf_humanise_bytes(&max_str, max_memory);
>> +               die(_("range-diff: unable to compute the range-diff, since it "
>> +                     "exceeds the maximum memory for the cost matrix: %s "
>> +                     "(%"PRIuMAX" bytes) needed, %s (%"PRIuMAX" bytes) available"),
>> +                   cost_str.buf, (uintmax_t)cost_bytes, max_str.buf, (uintmax_t)max_memory);
>> +       }
>> +       ALLOC_ARRAY(cost, cost_size);
>>         ALLOC_ARRAY(a2b, n);
>>         ALLOC_ARRAY(b2a, n);
>>
>
> This still has the same wording issue that I commented on in v2:
> https://lore.kernel.org/git/CABPp-BEDje5dYZHEyYMN6j_LdR5CqRN1cxc0riRK06qK-OxiTA@mail.gmail.com/