Re: [PATCH 1/8] migrate: make core migration code aware of hugepage

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> writes:

> Before enabling each user of page migration to support hugepage,
> this patch enables the list of pages for migration to link not only
> LRU pages, but also hugepages. As a result, putback_movable_pages()
> and migrate_pages() can handle both of LRU pages and hugepages.
>
> ChangeLog v4:
>  - make some macros return 'do {} while(0)'
>  - use more readable variable name
>
> ChangeLog v3:
>  - revert introducing migrate_movable_pages
>  - add isolate_huge_page
>
> ChangeLog v2:
>  - move code removing VM_HUGETLB from vma_migratable check into a
>    separate patch
>  - hold hugetlb_lock in putback_active_hugepage
>  - update comment near the definition of hugetlb_lock
>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
> Acked-by: Andi Kleen <ak@linux.intel.com>
> Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
> ---
>  include/linux/hugetlb.h |  6 ++++++
>  mm/hugetlb.c            | 32 +++++++++++++++++++++++++++++++-
>  mm/migrate.c            | 10 +++++++++-
>  3 files changed, 46 insertions(+), 2 deletions(-)
>
> diff --git v3.11-rc1.orig/include/linux/hugetlb.h v3.11-rc1/include/linux/hugetlb.h
> index c2b1801..c7a14a4 100644
> --- v3.11-rc1.orig/include/linux/hugetlb.h
> +++ v3.11-rc1/include/linux/hugetlb.h
> @@ -66,6 +66,9 @@ int hugetlb_reserve_pages(struct inode *inode, long from, long to,
>  						vm_flags_t vm_flags);
>  void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
>  int dequeue_hwpoisoned_huge_page(struct page *page);
> +bool isolate_huge_page(struct page *page, struct list_head *list);
> +void putback_active_hugepage(struct page *page);
> +void putback_active_hugepages(struct list_head *list);

are we using putback_active_hugepages in the patch series ?


>  void copy_huge_page(struct page *dst, struct page *src);
>
>  #ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
> @@ -134,6 +137,9 @@ static inline int dequeue_hwpoisoned_huge_page(struct page *page)
>  	return 0;
>  }

-aneesh

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