From mboxrd@z Thu Jan 1 00:00:00 1970 From: Theodore Ts'o Subject: Re: [PATCHv4 3/3] jbd/jbd2: use non-movable memory for the jbd superblock Date: Thu, 4 Sep 2014 22:37:45 -0400 Message-ID: <20140905023745.GC1971@thunk.org> References: <1409815781-28011-1-git-send-email-gioh.kim@lge.com> <1409815781-28011-4-git-send-email-gioh.kim@lge.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: akpm@linux-foundation.org, jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk, paulmck@linux.vnet.ibm.com, peterz@infradead.org, adilger.kernel@dilger.ca, minchan@kernel.org, js1304@gmail.com, gunho.lee@lge.com To: Gioh Kim Return-path: Received: from imap.thunk.org ([74.207.234.97]:39116 "EHLO imap.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755943AbaIEChx (ORCPT ); Thu, 4 Sep 2014 22:37:53 -0400 Content-Disposition: inline In-Reply-To: <1409815781-28011-4-git-send-email-gioh.kim@lge.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: 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 > Reviewed-by: Jan Kara Thanks, I've applied this to the ext4 git tree with a slightly rewritten commit description (for clarity). - Ted