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List:       linux-fsdevel
Subject:    Re: [PATCHv3 3/3] jbd/jbd2: allocate buffer-cache for superblock inode in non-movable area
From:       Jan Kara <jack () suse ! cz>
Date:       2014-08-28 10:07:06
Message-ID: 20140828100706.GD5961 () quack ! suse ! cz
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On Thu 28-08-14 11:33:20, Gioh Kim wrote:
> 
> A long-lasting buffer-cache can distrub page migration so that
> it must be allocated from non-movable area.
> 
> The journal_init_inode is creating a buffer-cache for superblock journaling.
> The superblock exists until system shutdown so that the buffer-cache
> for the superblock would also exist for a long time
> and it can distrub page migration.
> 
> This patch make the buffer-cache be allocated from non-movable area
> not to distrub page migration.
  The patch looks good. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>

								Honza

> 
> Signed-off-by: Gioh Kim <gioh.kim@lge.com>
> ---
>  fs/jbd/journal.c  |    2 +-
>  fs/jbd2/journal.c |    2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
> index 06fe11e..aab8549 100644
> --- a/fs/jbd/journal.c
> +++ b/fs/jbd/journal.c
> @@ -886,7 +886,7 @@ journal_t * journal_init_inode (struct inode *inode)
>                 goto out_err;
>         }
> 
> -       bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
> +       bh = getblk_unmovable(journal->j_dev, blocknr, journal->j_blocksize);
>         if (!bh) {
>                 printk(KERN_ERR
>                        "%s: Cannot get buffer for journal superblock\n",
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index 67b8e30..65bd3b1 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -1237,7 +1237,7 @@ journal_t * jbd2_journal_init_inode (struct inode *inode)
>                 goto out_err;
>         }
> 
> -       bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
> +       bh = getblk_unmovable(journal->j_dev, blocknr, journal->j_blocksize);
>         if (!bh) {
>                 printk(KERN_ERR
>                        "%s: Cannot get buffer for journal superblock\n",
> --
> 1.7.9.5
> 
-- 
Jan Kara <jack@suse.cz>
SUSE Labs, CR
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