linux-kernel - Re: [PATCHv3 2/3] ext4: allocate buffer-cache for superblock in, non-movable area

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Date:	Thu, 28 Aug 2014 12:06:45 +0200
From:	Jan Kara <jack@...e.cz>
To:	Gioh Kim <gioh.kim@....com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>, Jan Kara <jack@...e.cz>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Theodore Ts'o <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-ext4@...r.kernel.org, Minchan Kim <minchan@...nel.org>,
	Joonsoo Kim <js1304@...il.com>,
	이건호 <gunho.lee@....com>
Subject: Re: [PATCHv3 2/3] ext4: allocate buffer-cache for superblock in,
 non-movable area

On Thu 28-08-14 11:32:29, Gioh Kim wrote:
> 
> A buffer-cache for superblock is disturbing page migration,
> because the buffer-cache is not released until unmount.
> The buffer-cache must be allocated from non-movable area.
  The patch looks good. You can add:
Reviewed-by: Jan Kara <jack@...e.cz>

							Honza

> 
> Signed-off-by: Gioh Kim <gioh.kim@....com>
> ---
>  fs/ext4/super.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 32b43ad..e4b62b3 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -3435,7 +3435,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
>                 logical_sb_block = sb_block;
>         }
> 
> -       if (!(bh = sb_bread(sb, logical_sb_block))) {
> +       if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
>                 ext4_msg(sb, KERN_ERR, "unable to read superblock");
>                 goto out_fail;
>         }
> @@ -3645,7 +3645,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
>                 brelse(bh);
>                 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
>                 offset = do_div(logical_sb_block, blocksize);
> -               bh = sb_bread(sb, logical_sb_block);
> +               bh = sb_bread_unmovable(sb, logical_sb_block);
>                 if (!bh) {
>                         ext4_msg(sb, KERN_ERR,
>                                "Can't read superblock on 2nd try");
> @@ -3867,7 +3867,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> 
>         for (i = 0; i < db_count; i++) {
>                 block = descriptor_loc(sb, logical_sb_block, i);
> -               sbi->s_group_desc[i] = sb_bread(sb, block);
> +               sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
>                 if (!sbi->s_group_desc[i]) {
>                         ext4_msg(sb, KERN_ERR,
>                                "can't read group descriptor %d", i);
> --
> 1.7.9.5
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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