2014-08-14 오후 2:12, Gioh Kim 쓴 글: > 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-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
