On Thu, 05 Feb 2009 15:44:03 -0800 (PST) David Miller <davem@xxxxxxxxxxxxx> wrote: > > Later I reduced MAX_ORDER to 9 on s390, so we don't leave large > > portions of memory unused. > > Isn't is easier to just make sure your vmemmap mappings extend to such > boundaries, whether they contain available memory or not? > > That's the only requirement you have to satisfy to avoid having to > specify HOLES_IN_ZONE. You don't have to have memory there, just > some vmmemmap page structs have to be mapped at those indices. > > And then you won't need waste memory with these MAX_ORDER boundary > adjustments. Sounds reasonable. Back then I was under the impression that it is not sufficient to only have a struct page but also a page for each PFN. I'll give it a try as soon as time permits. Thanks! -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
