diff mbox series

[v3,4/4] arm64: mm: Override arch_wants_pte_order()

Message ID 20230714161733.4144503-4-ryan.roberts@arm.com (mailing list archive)
State New, archived
Headers show
Series variable-order, large folios for anonymous memory | expand

Commit Message

Ryan Roberts July 14, 2023, 4:17 p.m. UTC 
Define an arch-specific override of arch_wants_pte_order() so that when
FLEXIBLE_THP is enabled, large folios will be allocated for anonymous
memory with an order that is compatible with arm64's contpte mappings.

Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
---
 arch/arm64/include/asm/pgtable.h | 6 ++++++
 1 file changed, 6 insertions(+)

Comments

Yu Zhao July 14, 2023, 4:47 p.m. UTC | #1 
On Fri, Jul 14, 2023 at 10:17 AM Ryan Roberts <ryan.roberts@arm.com> wrote:
>
> Define an arch-specific override of arch_wants_pte_order() so that when
> FLEXIBLE_THP is enabled, large folios will be allocated for anonymous
> memory with an order that is compatible with arm64's contpte mappings.
>
> Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>

Reviewed-by: Yu Zhao <yuzhao@google.com>
diff mbox series

Patch

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 0bd18de9fd97..d00bb26fe28f 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1106,6 +1106,12 @@  extern pte_t ptep_modify_prot_start(struct vm_area_struct *vma,
 extern void ptep_modify_prot_commit(struct vm_area_struct *vma,
 				    unsigned long addr, pte_t *ptep,
 				    pte_t old_pte, pte_t new_pte);
+
+#define arch_wants_pte_order arch_wants_pte_order
+static inline int arch_wants_pte_order(void)
+{
+	return CONT_PTE_SHIFT - PAGE_SHIFT;
+}
 #endif /* !__ASSEMBLY__ */
 
 #endif /* __ASM_PGTABLE_H */