From: Yicong Yang <yangyicong@hisilicon.com> commit 62df5870ebf7cec96a51c9b9008daf167e22db14 upstream. With the support of FEAT_HAFT, the NONLEAF_PMD_YOUNG can be enabled on arm64 since the hardware is capable of updating the AF flag for PMD table descriptor. Since the AF bit of the table descriptor shares the same bit position in block descriptors, we only need to implement arch_has_hw_nonleaf_pmd_young() and select related configs. The related pmd_young test/update operations keeps the same with and already implemented for transparent page support. Currently ARCH_HAS_NONLEAF_PMD_YOUNG is used to improve the efficiency of lru-gen aging. Signed-off-by: Yicong Yang <yangyicong@hisilicon.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20241102104235.62560-5-yangyicong@huawei.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Conflicts: arch/arm64/Kconfig [Context conflicts] Signed-off-by: JiangShui Yang <yangjiangshui@h-partners.com> Signed-off-by: Qi Xi <xiqi2@huawei.com> --- arch/arm64/Kconfig | 1 + arch/arm64/include/asm/pgtable.h | 8 ++++++-- 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 750ed20347fe..eef487d364bb 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -30,6 +30,7 @@ config ARM64 select ARCH_HAS_KEEPINITRD select ARCH_HAS_MEMBARRIER_SYNC_CORE select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE + select ARCH_HAS_NONLEAF_PMD_YOUNG if ARM64_HAFT select ARCH_HAS_PTE_DEVMAP select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_SETUP_DMA_OPS diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index b5e969bc074d..3c82bae2602e 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -852,7 +852,7 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma, return young; } -#ifdef CONFIG_TRANSPARENT_HUGEPAGE +#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG) #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, unsigned long address, @@ -860,7 +860,7 @@ static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, { return ptep_test_and_clear_young(vma, address, (pte_t *)pmdp); } -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ +#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG */ #define __HAVE_ARCH_PTEP_GET_AND_CLEAR static inline pte_t ptep_get_and_clear(struct mm_struct *mm, @@ -1013,6 +1013,10 @@ static inline bool arch_faults_on_old_pte(void) } #define arch_faults_on_old_pte arch_faults_on_old_pte +#ifdef CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG +#define arch_has_hw_nonleaf_pmd_young system_supports_haft +#endif + /* * Experimentally, it's cheap to set the access flag in hardware and we * benefit from prefaulting mappings as 'old' to start with. -- 2.33.0