Messages in this thread | | | Date | Mon, 1 Mar 2021 20:53:06 +0000 | From | Matthew Wilcox <> | Subject | Re: [PATCH v3 01/25] mm: Introduce struct folio |
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On Mon, Mar 01, 2021 at 03:26:11PM -0500, Zi Yan wrote: > > +static inline struct folio *next_folio(struct folio *folio) > > +{ > > + return folio + folio_nr_pages(folio); > > Are you planning to make hugetlb use folio too?
Eventually, probably. It's not my focus.
> If yes, this might not work if we have CONFIG_SPARSEMEM && !CONFIG_SPARSEMEM_VMEMMAP > with a hugetlb folio > MAX_ORDER, because struct page might not be virtually contiguous. > See the experiment I did in [1]. > > [1] https://lore.kernel.org/linux-mm/16F7C58B-4D79-41C5-9B64-A1A1628F4AF2@nvidia.com/
I thought we were going to forbid that configuration? ie no pages larger than MAX_ORDER with (SPARSEMEM && !SPARSEMEM_VMEMMAP)
https://lore.kernel.org/linux-mm/312AECBD-CA6D-4E93-A6C1-1DF87BABD92D@nvidia.com/
is somewhere else we were discussing this.
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