On Tue, Oct 23, 2018 at 06:32:01PM +0530, Anshuman Khandual wrote:
> Let arm64 subscribe to the previously added framework in which architecture
> can inform whether a given huge page size is supported for migration. This
> just overrides the default function arch_hugetlb_migration_supported() and
> enables migration for all possible HugeTLB page sizes on arm64. With this,
> HugeTLB migration support on arm64 now covers all possible HugeTLB options.
>
> CONT PTE PMD CONT PMD PUD
> -------- --- -------- ---
> 4K: 64K 2M 32M 1G
> 16K: 2M 32M 1G
> 64K: 2M 512M 16G
>
> Reviewed-by: Naoya Horiguchi <n-horigu...@ah.jp.nec.com>
> Signed-off-by: Anshuman Khandual <anshuman.khand...@arm.com>
Reviewed-by: Steve Capper <steve.cap...@arm.com>
> ---
> arch/arm64/include/asm/hugetlb.h | 5 +++++
> arch/arm64/mm/hugetlbpage.c | 20 ++++++++++++++++++++
> 2 files changed, 25 insertions(+)
>
> diff --git a/arch/arm64/include/asm/hugetlb.h
> b/arch/arm64/include/asm/hugetlb.h
> index e73f685..656f70e 100644
> --- a/arch/arm64/include/asm/hugetlb.h
> +++ b/arch/arm64/include/asm/hugetlb.h
> @@ -20,6 +20,11 @@
>
> #include <asm/page.h>
>
> +#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
> +#define arch_hugetlb_migration_supported arch_hugetlb_migration_supported
> +extern bool arch_hugetlb_migration_supported(struct hstate *h);
> +#endif
> +
> static inline pte_t huge_ptep_get(pte_t *ptep)
> {
> return READ_ONCE(*ptep);
> diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
> index 21512ca..f3afdcf 100644
> --- a/arch/arm64/mm/hugetlbpage.c
> +++ b/arch/arm64/mm/hugetlbpage.c
> @@ -27,6 +27,26 @@
> #include <asm/tlbflush.h>
> #include <asm/pgalloc.h>
>
> +#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
> +bool arch_hugetlb_migration_supported(struct hstate *h)
> +{
> + size_t pagesize = huge_page_size(h);
> +
> + switch (pagesize) {
> +#ifdef CONFIG_ARM64_4K_PAGES
> + case PUD_SIZE:
> +#endif
> + case PMD_SIZE:
> + case CONT_PMD_SIZE:
> + case CONT_PTE_SIZE:
> + return true;
> + }
> + pr_warn("%s: unrecognized huge page size 0x%lx\n",
> + __func__, pagesize);
> + return false;
> +}
> +#endif
> +
> int pmd_huge(pmd_t pmd)
> {
> return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
> --
> 2.7.4
>
