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viLIaWFVO1sfU3bFJKDW2Wu1wqPHCxler+H0X5QOf+Zsx3EfJRuwi8bQ5IxXVTsAx4raGSvgCH7XTWXJXmfgX/klssntFeg2BPsu53S2AWh4tM+zlvNbfu6Umc6JdqXkJfZEr8bZmN/3ezgNvoagDZYgixgRfMMP0EpYi/B+I5jAthnVO4Bw2R0T3gy0D3svY0W+btztDlIl/gCnzV5wVn7HorST+dkL/Rq4HUw91+HD/JgGDkHYro9ddkf7cto5ohZgTNtChYhIHyHWDIGQrVqR4nxeZ9IAJDivb2XE37U5BT2r/6oveUSiwIfake2mIY2nrM3YfvVGr1u1Scfhe6nJcPVaxxeyTWNfusAxvOxA6mw3sFyS9feGHuluh/efRr+veA+CYxEW/ApFkEd9Y885DNHVq2g75R0YB 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: On 7/15/23 00:17, Ryan Roberts wrote: > arch_wants_pte_order() can be overridden by the arch to return the > preferred folio order for pte-mapped memory. This is useful as some > architectures (e.g. arm64) can coalesce TLB entries when the physical > memory is suitably contiguous. > > The first user for this hint will be FLEXIBLE_THP, which aims to > allocate large folios for anonymous memory to reduce page faults and > other per-page operation costs. > > Here we add the default implementation of the function, used when the > architecture does not define it, which returns -1, implying that the HW > has no preference. In this case, mm will choose it's own default order. > > Signed-off-by: Ryan Roberts Reviewed-by: Yin Fengwei Regards Yin, Fengwei > --- > include/linux/pgtable.h | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h > index 5063b482e34f..2a1d83775837 100644 > --- a/include/linux/pgtable.h > +++ b/include/linux/pgtable.h > @@ -313,6 +313,19 @@ static inline bool arch_has_hw_pte_young(void) > } > #endif > > +#ifndef arch_wants_pte_order > +/* > + * Returns preferred folio order for pte-mapped memory. Must be in range [0, > + * PMD_SHIFT-PAGE_SHIFT) and must not be order-1 since THP requires large folios > + * to be at least order-2. Negative value implies that the HW has no preference > + * and mm will choose it's own default order. > + */ > +static inline int arch_wants_pte_order(void) > +{ > + return -1; > +} > +#endif > + > #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR > static inline pte_t ptep_get_and_clear(struct mm_struct *mm, > unsigned long address,