[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <53EC47B4.8020408@lge.com>
Date: Thu, 14 Aug 2014 14:23:00 +0900
From: Gioh Kim <gioh.kim@....com>
To: 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
CC: Minchan Kim <minchan@...nel.org>, Joonsoo Kim <js1304@...il.com>,
ÀÌ°ÇÈ£ <gunho.lee@....com>
Subject: Re: [PATCH 0/2] new APIs to allocate buffer-cache for superblock
in non-movable area
2014-08-14 ¿ÀÈÄ 2:12, Gioh Kim ¾´ ±Û:
> Hello,
>
> This patch try to solve problem that a long-lasting page caches of
> ext4 superblock and journaling of superblock disturb page migration.
>
> I've been testing CMA feature on my ARM-based platform
> and found that two page caches cannot be migrated.
> They are page caches of superblock of ext4 filesystem and its journaling data.
>
> Current ext4 reads superblock with sb_bread() that allocates page
> from movable area. But the problem is that ext4 hold the page until
> it is unmounted. If root filesystem is ext4 the page cannot be migrated forever.
> And also the journaling data for the superblock cannot be migreated.
>
> I introduce a new API for allocating page cache from non-movable area.
> It is useful for ext4/ext3 and others that want to hold page cache for a long time.
>
> I have 3 patchs:
>
> 1. Patch 1/3: introduce a new API that create page cache from non-movable area
> 2. Patch 2/3: have ext4 use the new API to read superblock
> 3. Patch 3/3: have jbd/jbd2 use the new API to make journaling of superblock
>
> This patchset is based on linux-next-20140814.
>
> Thanks a lot.
>
> Gioh Kim (3):
> fs/buffer.c: allocate buffer cache from non-movable area
> ext4: allocate buffer-cache for superblock in non-movable area
> jbd-jbd2-allocate-buffer-cache-for-superblock-inode-.patch
>
> fs/buffer.c | 63 ++++++++++++++++++++++++++++++----
> fs/ext4/super.c | 6 +--
> fs/jbd/journal.c | 2 -
> fs/jbd2/journal.c | 2 -
> include/linux/buffer_head.h | 10 +++++
> 5 files changed, 71 insertions(+), 12 deletions(-)
>
I'm sorry to forget mentioning that this is 2nd version of https://lkml.org/lkml/2014/7/22/34.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists