On Thu, Oct 29, 2020 at 7:34 PM Hillf Danton <hdanton@xxxxxxxx> wrote: > On Thu, 29 Oct 2020 12:34:51 -0700 John Stultz wrote: > > As for your comment on HPAGE_PMD_ORDER (9 on arm64/arm) and > > PAGE_ALLOC_COSTLY_ORDER(3), I'm not totally sure I understand your > > question? Are you suggesting those values would be more natural orders > > to choose from? > > The numbers, 9 and 3, are not magic themselves but under the mm diretory > they draw more attentions than others do. Sometimes it would take two > minutes for me to work out that HPAGE_PMD_ORDER does not mean 1MiB, on > platforms like arm64 or not. Yes, I can say it took me longer than two minutes to dig around and work out HPAGE_PMD_ORDER for my last reply. :) Though I'm still a bit unsure if you are proposing something more than just a comment to explain why order 8 and order 4 allocations are used in my patch? Please let me know if so. thanks -john
