linux-kernel - Re: [PATCH 1/5] mm: migrate: Add mode parameter to support additional page copy routines.

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Date:   Fri, 25 Nov 2016 10:56:16 +1100
From:   Balbir Singh <bsingharora@...il.com>
To:     Zi Yan <zi.yan@...t.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Cc:     akpm@...ux-foundation.org, minchan@...nel.org, vbabka@...e.cz,
        mgorman@...hsingularity.net, kirill.shutemov@...ux.intel.com,
        n-horiguchi@...jp.nec.com, khandual@...ux.vnet.ibm.com,
        Zi Yan <zi.yan@...rutgers.edu>, Zi Yan <ziy@...dia.com>
Subject: Re: [PATCH 1/5] mm: migrate: Add mode parameter to support additional
 page copy routines.



On 23/11/16 03:25, Zi Yan wrote:
> From: Zi Yan <zi.yan@...rutgers.edu>
> 
> From: Zi Yan <ziy@...dia.com>
> 
> migrate_page_copy() and copy_huge_page() are affected.
> 
> Signed-off-by: Zi Yan <ziy@...dia.com>
> Signed-off-by: Zi Yan <zi.yan@...rutgers.edu>
> ---
>  fs/aio.c                |  2 +-
>  fs/hugetlbfs/inode.c    |  2 +-
>  fs/ubifs/file.c         |  2 +-
>  include/linux/migrate.h |  6 ++++--
>  mm/migrate.c            | 14 ++++++++------
>  5 files changed, 15 insertions(+), 11 deletions(-)
> 
> diff --git a/fs/aio.c b/fs/aio.c
> index 428484f..a67c764 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -418,7 +418,7 @@ static int aio_migratepage(struct address_space *mapping, struct page *new,
>  	 * events from being lost.
>  	 */
>  	spin_lock_irqsave(&ctx->completion_lock, flags);
> -	migrate_page_copy(new, old);
> +	migrate_page_copy(new, old, 0);

Can we have a useful enum instead of 0, its harder to read and understand
0

>  	BUG_ON(ctx->ring_pages[idx] != old);
>  	ctx->ring_pages[idx] = new;
>  	spin_unlock_irqrestore(&ctx->completion_lock, flags);
> diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
> index 4fb7b10..a17bfef 100644
> --- a/fs/hugetlbfs/inode.c
> +++ b/fs/hugetlbfs/inode.c
> @@ -850,7 +850,7 @@ static int hugetlbfs_migrate_page(struct address_space *mapping,
>  	rc = migrate_huge_page_move_mapping(mapping, newpage, page);
>  	if (rc != MIGRATEPAGE_SUCCESS)
>  		return rc;
> -	migrate_page_copy(newpage, page);
> +	migrate_page_copy(newpage, page, 0);

Ditto

>  
>  	return MIGRATEPAGE_SUCCESS;
>  }
> diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
> index b4fbeef..bf54e32 100644
> --- a/fs/ubifs/file.c
> +++ b/fs/ubifs/file.c
> @@ -1468,7 +1468,7 @@ static int ubifs_migrate_page(struct address_space *mapping,
>  		SetPagePrivate(newpage);
>  	}
>  
> -	migrate_page_copy(newpage, page);
> +	migrate_page_copy(newpage, page, 0);

Here as well


Balbir Singh.