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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/
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