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 qj5NPRM5 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/2/24 18:50, Barry Song wrote: > From: Barry Song > > Should do_swap_page() have the capability to directly map a large folio, > metadata restoration becomes necessary for a specified number of pages > denoted as nr. It's important to highlight that metadata restoration is > solely required by the SPARC platform, which, however, does not enable > THP_SWAP. Consequently, in the present kernel configuration, there > exists no practical scenario where users necessitate the restoration of > nr metadata. Platforms implementing THP_SWAP might invoke this function > with nr values exceeding 1, subsequent to do_swap_page() successfully > mapping an entire large folio. Nonetheless, their arch_do_swap_page_nr() > functions remain empty. > > Cc: Khalid Aziz > Cc: "David S. Miller" > Cc: Andreas Larsson > Signed-off-by: Barry Song Looks good to me. Reviewed-by: Khalid Aziz > --- > include/linux/pgtable.h | 26 ++++++++++++++++++++------ > mm/memory.c | 3 ++- > 2 files changed, 22 insertions(+), 7 deletions(-) > > diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h > index 18019f037bae..463e84c3de26 100644 > --- a/include/linux/pgtable.h > +++ b/include/linux/pgtable.h > @@ -1084,6 +1084,15 @@ static inline int pgd_same(pgd_t pgd_a, pgd_t pgd_b) > }) > > #ifndef __HAVE_ARCH_DO_SWAP_PAGE > +static inline void arch_do_swap_page_nr(struct mm_struct *mm, > + struct vm_area_struct *vma, > + unsigned long addr, > + pte_t pte, pte_t oldpte, > + int nr) > +{ > + > +} > +#else > /* > * Some architectures support metadata associated with a page. When a > * page is being swapped out, this metadata must be saved so it can be > @@ -1092,12 +1101,17 @@ static inline int pgd_same(pgd_t pgd_a, pgd_t pgd_b) > * page as metadata for the page. arch_do_swap_page() can restore this > * metadata when a page is swapped back in. > */ > -static inline void arch_do_swap_page(struct mm_struct *mm, > - struct vm_area_struct *vma, > - unsigned long addr, > - pte_t pte, pte_t oldpte) > -{ > - > +static inline void arch_do_swap_page_nr(struct mm_struct *mm, > + struct vm_area_struct *vma, > + unsigned long addr, > + pte_t pte, pte_t oldpte, > + int nr) > +{ > + for (int i = 0; i < nr; i++) { > + arch_do_swap_page(vma->vm_mm, vma, addr + i * PAGE_SIZE, > + pte_advance_pfn(pte, i), > + pte_advance_pfn(oldpte, i)); > + } > } > #endif > > diff --git a/mm/memory.c b/mm/memory.c > index f033eb3528ba..74cdefd58f5f 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -4266,7 +4266,8 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) > VM_BUG_ON(!folio_test_anon(folio) || > (pte_write(pte) && !PageAnonExclusive(page))); > set_pte_at(vma->vm_mm, vmf->address, vmf->pte, pte); > - arch_do_swap_page(vma->vm_mm, vma, vmf->address, pte, vmf->orig_pte); > + arch_do_swap_page_nr(vma->vm_mm, vma, vmf->address, > + pte, vmf->orig_pte, 1); > > folio_unlock(folio); > if (folio != swapcache && swapcache) {