linux-kernel - Re: [PATCH 3/6] mm: migrate: teach migrate_misplaced

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Date:   Tue, 30 Mar 2021 08:21:23 +0800
From:   "Huang, Ying" <ying.huang@...el.com>
To:     Yang Shi <shy828301@...il.com>
Cc:     mgorman@...e.de, kirill.shutemov@...ux.intel.com, ziy@...dia.com,
        mhocko@...e.com, hughd@...gle.com, hca@...ux.ibm.com,
        gor@...ux.ibm.com, borntraeger@...ibm.com,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] mm: migrate: teach migrate_misplaced_page() about THP

Yang Shi <shy828301@...il.com> writes:

> In the following patch the migrate_misplaced_page() will be used to migrate THP
> for NUMA faul too.  Prepare to deal with THP.
>
> Signed-off-by: Yang Shi <shy828301@...il.com>
> ---
>  include/linux/migrate.h | 6 ++++--
>  mm/memory.c             | 2 +-
>  mm/migrate.c            | 2 +-
>  3 files changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/migrate.h b/include/linux/migrate.h
> index 3a389633b68f..6abd34986cc5 100644
> --- a/include/linux/migrate.h
> +++ b/include/linux/migrate.h
> @@ -102,14 +102,16 @@ static inline void __ClearPageMovable(struct page *page)
>  #ifdef CONFIG_NUMA_BALANCING
>  extern bool pmd_trans_migrating(pmd_t pmd);
>  extern int migrate_misplaced_page(struct page *page,
> -				  struct vm_area_struct *vma, int node);
> +				  struct vm_area_struct *vma, int node,
> +				  bool compound);
>  #else
>  static inline bool pmd_trans_migrating(pmd_t pmd)
>  {
>  	return false;
>  }
>  static inline int migrate_misplaced_page(struct page *page,
> -					 struct vm_area_struct *vma, int node)
> +					 struct vm_area_struct *vma, int node,
> +					 bool compound)
>  {
>  	return -EAGAIN; /* can't migrate now */
>  }
> diff --git a/mm/memory.c b/mm/memory.c
> index 003bbf3187d4..7fed578bdc31 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -4169,7 +4169,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
>  	}
>  
>  	/* Migrate to the requested node */
> -	migrated = migrate_misplaced_page(page, vma, target_nid);
> +	migrated = migrate_misplaced_page(page, vma, target_nid, false);
>  	if (migrated) {
>  		page_nid = target_nid;
>  		flags |= TNF_MIGRATED;
> diff --git a/mm/migrate.c b/mm/migrate.c
> index 62b81d5257aa..9c4ae5132919 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -2127,7 +2127,7 @@ static inline bool is_shared_exec_page(struct vm_area_struct *vma,
>   * the page that will be dropped by this function before returning.
>   */
>  int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
> -			   int node)
> +			   int node, bool compound)

Can we just use PageCompound(page) instead?

Best Regards,
Huang, Ying

>  {
>  	pg_data_t *pgdat = NODE_DATA(node);
>  	int isolated;