The patch titled
Subject: ext4: use non-movable memory for the ext4 superblock
has been added to the -mm tree. Its filename is
ext4-use-non-movable-memory-for-the-ext4-superblock.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ext4-use-non-movable-memory-for-the-ext4-superblock.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ext4-use-non-movable-memory-for-the-ext4-superblock.patch
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------------------------------------------------------
From: Gioh Kim <gioh.kim@xxxxxxx>
Subject: ext4: use non-movable memory for the ext4 superblock
A buffer-cache for superblock is disturbing page migration, because the
buffer-cache is not released until unmount. The buffer-cache must be
allocated from non-movable area.
Signed-off-by: Gioh Kim <gioh.kim@xxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Cc: "Theodore Ts'o" <tytso@xxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Andreas Dilger <adilger.kernel@xxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Gunho Lee <gunho.lee@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ext4/super.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff -puN fs/ext4/super.c~ext4-use-non-movable-memory-for-the-ext4-superblock fs/ext4/super.c
--- a/fs/ext4/super.c~ext4-use-non-movable-memory-for-the-ext4-superblock
+++ a/fs/ext4/super.c
@@ -3436,7 +3436,7 @@ static int ext4_fill_super(struct super_
logical_sb_block = sb_block;
}
- if (!(bh = sb_bread(sb, logical_sb_block))) {
+ if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
ext4_msg(sb, KERN_ERR, "unable to read superblock");
goto out_fail;
}
@@ -3646,7 +3646,7 @@ static int ext4_fill_super(struct super_
brelse(bh);
logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
offset = do_div(logical_sb_block, blocksize);
- bh = sb_bread(sb, logical_sb_block);
+ bh = sb_bread_unmovable(sb, logical_sb_block);
if (!bh) {
ext4_msg(sb, KERN_ERR,
"Can't read superblock on 2nd try");
@@ -3868,7 +3868,7 @@ static int ext4_fill_super(struct super_
for (i = 0; i < db_count; i++) {
block = descriptor_loc(sb, logical_sb_block, i);
- sbi->s_group_desc[i] = sb_bread(sb, block);
+ sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
if (!sbi->s_group_desc[i]) {
ext4_msg(sb, KERN_ERR,
"can't read group descriptor %d", i);
_
Patches currently in -mm which might be from gioh.kim@xxxxxxx are
fsc-support-buffer-cache-allocations-with-gfp-modifiers.patch
ext4-use-non-movable-memory-for-the-ext4-superblock.patch
jbd-jbd2-use-non-movable-memory-for-the-jbd-superblock.patch
linux-next.patch
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