On Fri, Apr 14, 2023 at 02:02:51PM +0100, Ryan Roberts wrote: > For variable-order anonymous folios, we want to tune the order that we > prefer to allocate based on the vma. Add the routines to manage that > heuristic. > > TODO: Currently we always use the global maximum. Add per-vma logic! > > Signed-off-by: Ryan Roberts <ryan.roberts@xxxxxxx> > --- > include/linux/mm.h | 5 +++++ > mm/memory.c | 8 ++++++++ > 2 files changed, 13 insertions(+) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index cdb8c6031d0f..cc8d0b239116 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -3674,4 +3674,9 @@ madvise_set_anon_name(struct mm_struct *mm, unsigned long start, > } > #endif > > +/* > + * TODO: Should this be set per-architecture? > + */ > +#define ANON_FOLIO_ORDER_MAX 4 > + I think it has to be derived from size in bytes, not directly specifies page order. For 4K pages, order 4 is 64k and for 64k pages it is 1M. -- Kiryl Shutsemau / Kirill A. Shutemov
