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SubjectRe: [PATCH v2 02/12] mm/migrate: move migration helper from .h to .c
On Wed 27-05-20 15:44:53, Joonsoo Kim wrote:
> From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
>
> It's not performance sensitive function. Move it to .c.
> This is a preparation step for future change.
>
> Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>

Acked-by: Michal Hocko <mhocko@suse.com>

> ---
> include/linux/migrate.h | 33 +++++----------------------------
> mm/migrate.c | 29 +++++++++++++++++++++++++++++
> 2 files changed, 34 insertions(+), 28 deletions(-)
>
> diff --git a/include/linux/migrate.h b/include/linux/migrate.h
> index 3e546cb..1d70b4a 100644
> --- a/include/linux/migrate.h
> +++ b/include/linux/migrate.h
> @@ -31,34 +31,6 @@ enum migrate_reason {
> /* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
> extern const char *migrate_reason_names[MR_TYPES];
>
> -static inline struct page *new_page_nodemask(struct page *page,
> - int preferred_nid, nodemask_t *nodemask)
> -{
> - gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL;
> - unsigned int order = 0;
> - struct page *new_page = NULL;
> -
> - if (PageHuge(page))
> - return alloc_huge_page_nodemask(page_hstate(compound_head(page)),
> - preferred_nid, nodemask);
> -
> - if (PageTransHuge(page)) {
> - gfp_mask |= GFP_TRANSHUGE;
> - order = HPAGE_PMD_ORDER;
> - }
> -
> - if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
> - gfp_mask |= __GFP_HIGHMEM;
> -
> - new_page = __alloc_pages_nodemask(gfp_mask, order,
> - preferred_nid, nodemask);
> -
> - if (new_page && PageTransHuge(new_page))
> - prep_transhuge_page(new_page);
> -
> - return new_page;
> -}
> -
> #ifdef CONFIG_MIGRATION
>
> extern void putback_movable_pages(struct list_head *l);
> @@ -67,6 +39,8 @@ extern int migrate_page(struct address_space *mapping,
> enum migrate_mode mode);
> extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
> unsigned long private, enum migrate_mode mode, int reason);
> +extern struct page *new_page_nodemask(struct page *page,
> + int preferred_nid, nodemask_t *nodemask);
> extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
> extern void putback_movable_page(struct page *page);
>
> @@ -85,6 +59,9 @@ static inline int migrate_pages(struct list_head *l, new_page_t new,
> free_page_t free, unsigned long private, enum migrate_mode mode,
> int reason)
> { return -ENOSYS; }
> +static inline struct page *new_page_nodemask(struct page *page,
> + int preferred_nid, nodemask_t *nodemask)
> + { return NULL; }
> static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
> { return -EBUSY; }
>
> diff --git a/mm/migrate.c b/mm/migrate.c
> index 22a26a5..824c22e 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -1537,6 +1537,35 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
> return rc;
> }
>
> +struct page *new_page_nodemask(struct page *page,
> + int preferred_nid, nodemask_t *nodemask)
> +{
> + gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL;
> + unsigned int order = 0;
> + struct page *new_page = NULL;
> +
> + if (PageHuge(page))
> + return alloc_huge_page_nodemask(
> + page_hstate(compound_head(page)),
> + preferred_nid, nodemask);
> +
> + if (PageTransHuge(page)) {
> + gfp_mask |= GFP_TRANSHUGE;
> + order = HPAGE_PMD_ORDER;
> + }
> +
> + if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
> + gfp_mask |= __GFP_HIGHMEM;
> +
> + new_page = __alloc_pages_nodemask(gfp_mask, order,
> + preferred_nid, nodemask);
> +
> + if (new_page && PageTransHuge(new_page))
> + prep_transhuge_page(new_page);
> +
> + return new_page;
> +}
> +
> #ifdef CONFIG_NUMA
>
> static int store_status(int __user *status, int start, int value, int nr)
> --
> 2.7.4
>

--
Michal Hocko
SUSE Labs

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