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Message-ID: <53CDF437.4090306@lge.com> Date: Tue, 22 Jul 2014 14:18:47 +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 Subject: [PATCH 0/2] new API to allocate buffer-cache for superblock in non-movable area Hello, This patch try to solve problem that a long-lasting page cache of ext4 superblock disturbs page migration. I've been testing CMA feature on my ARM-based platform and found some pages for page caches cannot be migrated. Some of them are page caches of superblock of ext4 filesystem. Current ext4 reads superblock with sb_bread(). sb_bread() 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. I introduce a new API for allocating page from non-movable area. It is useful for ext4 and others that want to hold page cache for a long time. I have 2 patchs: 1. Patch 1/2: introduce a new API that create page cache from non-movable area 2. Patch 2/2: have ext4 use the new API to read superblock This patchset is based on linux-next-20140717. Thanks a lot. Gioh Kim (2): fs/buffer.c: allocate buffer cache from non-movable area ext4: allocate buffer-cache for superblock in non-movable area fs/buffer.c | 39 ++++++++++++++++++++++++++++++++------- fs/ext4/super.c | 6 +++--- include/linux/buffer_head.h | 8 ++++++++ 3 files changed, 43 insertions(+), 10 deletions(-) -- 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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