linux-ext4 - Re: [PATCHv3 3/3] jbd/jbd2: allocate buffer-cache for superblock inode in non-movable area

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Date:	Thu, 28 Aug 2014 12:07:06 +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 3/3] jbd/jbd2: allocate buffer-cache for superblock
 inode in non-movable area

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@...e.cz>

								Honza

> 
> Signed-off-by: Gioh Kim <gioh.kim@....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@...e.cz>
SUSE Labs, CR
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