linux-kernel - Re: [PATCH v2 02/12] mm/migrate: move migration helper from .h to .c

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Date:   Tue, 9 Jun 2020 14:44:30 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     js1304@...il.com
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-team@....com,
        Vlastimil Babka <vbabka@...e.cz>,
        Christoph Hellwig <hch@...radead.org>,
        Roman Gushchin <guro@...com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [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@....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@...cle.com>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: Michal Hocko <mhocko@...e.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