Signed-off-by: wang wei <a929244...@163.com>
---
>diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
>index 80fef38d9d64..365c73be0bb4 100644
>--- a/include/linux/mm_types.h
>+++ b/include/linux/mm_types.h
>@@ -310,6 +310,7 @@ typedef struct {
> * @_hugetlb_cgroup: Do not use directly, use accessor in hugetlb_cgroup.h.
> * @_hugetlb_cgroup_rsvd: Do not use directly, use accessor in
> hugetlb_cgroup.h.
> * @_hugetlb_hwpoison: Do not use directly, call raw_hwp_list_head().
>+ * @_hugetlb_list: To be used in hugetlb core code only.
> * @_deferred_list: Folios to be split under memory pressure.
> * @_unused_slab_obj_exts: Placeholder to match obj_exts in struct slab.
> *
>@@ -397,6 +398,17 @@ struct folio {
> };
> struct page __page_2;
> };
>+ union {
>+ struct {
>+ unsigned long _flags_3;
>+ unsigned long _head_3;
>+ /* public: */
>+ struct list_head _hugetlb_list;
>+ /* private: the union with struct page is transitional */
>+ };
>+ struct page __page_3;
>+ };
>+
> };
>
As far as I know, increasing the size of folio maybe decrease
the revenue of HVO, do you measure it?
> #define FOLIO_MATCH(pg, fl) \
>@@ -433,6 +445,12 @@ FOLIO_MATCH(compound_head, _head_2);
> FOLIO_MATCH(flags, _flags_2a);
> FOLIO_MATCH(compound_head, _head_2a);
> #undef FOLIO_MATCH
>+#define FOLIO_MATCH(pg, fl) \
>+ static_assert(offsetof(struct folio, fl) == \
>+ offsetof(struct page, pg) + 3 * sizeof(struct page))
>+FOLIO_MATCH(flags, _flags_3);
>+FOLIO_MATCH(compound_head, _head_3);
>+#undef FOLIO_MATCH
>
> /**
> * struct ptdesc - Memory descriptor for page tables.
--
2.25.1
