On 11/08/2016 05:01 AM, Naoya Horiguchi wrote:
> This patch prepares thp migration's core code. These code will be open when
> unmap_and_move() stops unconditionally splitting thp and get_new_page() starts
> to allocate destination thps.
>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
> ---
> ChangeLog v1 -> v2:
> - support pte-mapped thp, doubly-mapped thp
> ---
> arch/x86/include/asm/pgtable_64.h | 2 +
> include/linux/swapops.h | 61 +++++++++++++++
> mm/huge_memory.c | 154 ++++++++++++++++++++++++++++++++++++++
> mm/migrate.c | 44 ++++++++++-
> mm/pgtable-generic.c | 3 +-
> 5 files changed, 262 insertions(+), 2 deletions(-)
>
> diff --git v4.9-rc2-mmotm-2016-10-27-18-27/arch/x86/include/asm/pgtable_64.h v4.9-rc2-mmotm-2016-10-27-18-27_patched/arch/x86/include/asm/pgtable_64.h
> index 1cc82ec..3a1b48e 100644
> --- v4.9-rc2-mmotm-2016-10-27-18-27/arch/x86/include/asm/pgtable_64.h
> +++ v4.9-rc2-mmotm-2016-10-27-18-27_patched/arch/x86/include/asm/pgtable_64.h
> @@ -167,7 +167,9 @@ static inline int pgd_large(pgd_t pgd) { return 0; }
> ((type) << (SWP_TYPE_FIRST_BIT)) \
> | ((offset) << SWP_OFFSET_FIRST_BIT) })
> #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
> +#define __pmd_to_swp_entry(pte) ((swp_entry_t) { pmd_val((pmd)) })
The above macro takes *pte* but evaluates on *pmd*, guess its should
be fixed either way.
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