On Mon, Jun 12, 2023 at 02:04:02PM -0700, Vishal Moola (Oracle) wrote:
> Creates pagetable_pte_ctor(), pagetable_pmd_ctor(), pagetable_pte_dtor(),
> and pagetable_pmd_dtor() and make the original pgtable
> constructor/destructors wrappers.
Nit: either "creates ... makes" or "create ... make"
I like the second form more.
> Signed-off-by: Vishal Moola (Oracle)
Acked-by: Mike Rapoport (IBM)
> ---
> include/linux/mm.h | 56 ++
> 1 file changed, 42 insertions(+), 14 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index a1af7983e1bd..dc211c43610b 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2886,20 +2886,34 @@ static inline bool ptlock_init(struct ptdesc *ptdesc)
> { return true; }
> static inline void ptlock_free(struct ptdesc *ptdesc) {}
> #endif /* USE_SPLIT_PTE_PTLOCKS */
>
> -static inline bool pgtable_pte_page_ctor(struct page *page)
> +static inline bool pagetable_pte_ctor(struct ptdesc *ptdesc)
> {
> - if (!ptlock_init(page_ptdesc(page)))
> + struct folio *folio = ptdesc_folio(ptdesc);
> +
> + if (!ptlock_init(ptdesc))
> return false;
> - __SetPageTable(page);
> - inc_lruvec_page_state(page, NR_PAGETABLE);
> + __folio_set_table(folio);
This comment is more to patch 1 ("mm: Add PAGE_TYPE_OP folio functions")
It would be better to have _pgtable here, as "table" does not necessary
mean page table.
With PageType SetPageTable was fine, but with folio I think it should be
more explicit.
I'd add a third parameter to PAGE_TYPE_OPS for that.
> + lruvec_stat_add_folio(folio, NR_PAGETABLE);
> return true;
> }
>
> +static inline bool pgtable_pte_page_ctor(struct page *page)
> +{
> + return pagetable_pte_ctor(page_ptdesc(page));
> +}
> +
> +static inline void pagetable_pte_dtor(struct ptdesc *ptdesc)
> +{
> + struct folio *folio = ptdesc_folio(ptdesc);
> +
> + ptlock_free(ptdesc);
> + __folio_clear_table(folio);
> + lruvec_stat_sub_folio(folio, NR_PAGETABLE);
> +}
> +
> static inline void pgtable_pte_page_dtor(struct page *page)
> {
> - ptlock_free(page_ptdesc(page));
> - __ClearPageTable(page);
> - dec_lruvec_page_state(page, NR_PAGETABLE);
> + pagetable_pte_dtor(page_ptdesc(page));
> }
>
> #define pte_offset_map_lock(mm, pmd, address, ptlp) \
> @@ -2981,20 +2995,34 @@ static inline spinlock_t *pmd_lock(struct mm_struct
> *mm, pmd_t *pmd)
> return ptl;
> }
>
> -static inline bool pgtable_pmd_page_ctor(struct page *page)
> +static inline bool pagetable_pmd_ctor(struct ptdesc *ptdesc)
> {
> - if (!pmd_ptlock_init(page_ptdesc(page)))
> + struct folio *folio = ptdesc_folio(ptdesc);
> +
> + if (!pmd_ptlock_init(ptdesc))
> return false;
> - __SetPageTable(page);
> - inc_lruvec_page_state(page, NR_PAGETABLE);
> + __folio_set_table(folio);
> + lruvec_stat_add_folio(folio, NR_PAGETABLE);
> return true;
> }
>
> +static inline bool pgtable_pmd_page_ctor(struct page *page)
> +{
> + return pagetable_pmd_ctor(page_ptdesc(page));
> +}
> +
> +static inline void pagetable_pmd_dtor(struct ptdesc *ptdesc)
> +{
> + struct folio *folio = ptdesc_folio(ptdesc);
> +
> + pmd_ptlock_free(ptdesc);
> + __folio_clear_table(folio);
> + lruvec_stat_sub_folio(folio, NR_PAGETABLE);
> +}
> +
> static inline void pgtable_pmd_page_dtor(struct page *page)
> {
> - pmd_ptlock_free(page_ptdesc(page));
> - __ClearPageTable(page);
> - dec_lruvec_page_state(page, NR_PAGETABLE);
> + pagetable_pmd_dtor(page_ptdesc(page));
> }
>
> /*
> --
> 2.40.1
>
>
--
Sincerely yours,
Mike.
