On Wed, Sep 4, 2024 at 9:37 AM Kent Overstreet <kent.overstreet@xxxxxxxxx> wrote: > > On Wed, Sep 04, 2024 at 05:35:49PM GMT, Matthew Wilcox wrote: > > 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. > > Ah, thanks, that makes more sense. > > But it would add a lot of overhead to the page alloc/free paths... Yeah, inserting into a maple_tree in the fast path of page allocation would introduce considerable performance overhead.
