On Wed, Sep 04, 2024 at 09:18:01AM -0700, Suren Baghdasaryan wrote:
> I'm not sure I understand your suggestion, Matthew. We allocate a
> folio and need to store a reference to the tag associated with the
> code that allocated that folio. We are not operating with ranges here.
> Are you suggesting to use a maple tree instead of page_ext to store
> this reference?
I'm saying that a folio has a physical address.  So you can use a physical
address as an index into a maple tree to store additional information
instead of using page_ext or trying to hammer the additional information
into struct page somewhere.

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