linux-kernel - Re: [PATCH 08/11] mm: compaction: Introduce sync-light migration for use by compaction

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Date:	Sun, 18 Dec 2011 11:05:52 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Dave Jones <davej@...hat.com>, Jan Kara <jack@...e.cz>,
	Andy Isaacson <adi@...apodia.org>,
	Johannes Weiner <jweiner@...hat.com>,
	Rik van Riel <riel@...hat.com>, Nai Xia <nai.xia@...il.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 08/11] mm: compaction: Introduce sync-light migration for
 use by compaction

On Wed, Dec 14, 2011 at 03:41:30PM +0000, Mel Gorman wrote:
> This patch adds a lightweight sync migrate operation MIGRATE_SYNC_LIGHT
> mode that avoids writing back pages to backing storage. Async
> compaction maps to MIGRATE_ASYNC while sync compaction maps to
> MIGRATE_SYNC_LIGHT. For other migrate_pages users such as memory
> hotplug, MIGRATE_SYNC is used.
> 
> This avoids sync compaction stalling for an excessive length of time,
> particularly when copying files to a USB stick where there might be
> a large number of dirty pages backed by a filesystem that does not
> support ->writepages.
> 
> [aarcange@...hat.com: This patch is heavily based on Andrea's work]
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Acked-by: Minchan Kim <minchan@...nel.org>

> ---
>  fs/btrfs/disk-io.c      |    3 +-
>  fs/hugetlbfs/inode.c    |    2 +-
>  fs/nfs/internal.h       |    2 +-
>  fs/nfs/write.c          |    2 +-
>  include/linux/fs.h      |    6 ++-
>  include/linux/migrate.h |   23 +++++++++++---
>  mm/compaction.c         |    2 +-
>  mm/memory-failure.c     |    2 +-
>  mm/memory_hotplug.c     |    2 +-
>  mm/mempolicy.c          |    2 +-
>  mm/migrate.c            |   78 ++++++++++++++++++++++++++---------------------
>  11 files changed, 74 insertions(+), 50 deletions(-)
> 
> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> index 896b87a..dbe9518 100644
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -872,7 +872,8 @@ static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
>  
>  #ifdef CONFIG_MIGRATION
>  static int btree_migratepage(struct address_space *mapping,
> -			struct page *newpage, struct page *page, bool sync)
> +			struct page *newpage, struct page *page,
> +			enum migrate_mode sync)
>  {
>  	/*
>  	 * we can't safely write a btree page from here,
> diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
> index 10b9883..6b80537 100644
> --- a/fs/hugetlbfs/inode.c
> +++ b/fs/hugetlbfs/inode.c
> @@ -577,7 +577,7 @@ static int hugetlbfs_set_page_dirty(struct page *page)
>  
>  static int hugetlbfs_migrate_page(struct address_space *mapping,
>  				struct page *newpage, struct page *page,
> -				bool sync)
> +				enum migrate_mode mode)

Nitpick, except this one, we use enum migrate_mode sync.

-- 
Kind regards,
Minchan Kim
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