linux-ext4 - Re: [PATCHv4 3/3] jbd/jbd2: use non-movable memory for the jbd superblock

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Message-ID: <20140905023745.GC1971@thunk.org>
Date:	Thu, 4 Sep 2014 22:37:45 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Gioh Kim <gioh.kim@....com>
Cc:	akpm@...ux-foundation.org, jack@...e.cz,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
	paulmck@...ux.vnet.ibm.com, peterz@...radead.org,
	adilger.kernel@...ger.ca, minchan@...nel.org, js1304@...il.com,
	gunho.lee@....com
Subject: Re: [PATCHv4 3/3] jbd/jbd2: use non-movable memory for the jbd
 superblock

On Thu, Sep 04, 2014 at 04:29:41PM +0900, 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.
> 
> Signed-off-by: Gioh Kim <gioh.kim@....com>
> Reviewed-by: Jan Kara <jack@...e.cz>

Thanks, I've applied this to the ext4 git tree with a slightly
rewritten commit description (for clarity).

						- Ted
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