linux-ext4 - [PATCHv3 3/3] jbd/jbd2: allocate buffer-cache for superblock inode in non-movable area

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Message-ID: <53FE94F0.5070401@lge.com>
Date:	Thu, 28 Aug 2014 11:33:20 +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>,
	이건호 <gunho.lee@....com>
Subject: [PATCHv3 3/3] jbd/jbd2: allocate buffer-cache for superblock inode
 in non-movable area


A long-lasting buffer-cache can distrub page migration so that
it must be allocated from non-movable area.

The journal_init_inode is creating a buffer-cache for superblock journaling.
The superblock exists until system shutdown so that the buffer-cache
for the superblock would also exist for a long time
and it can distrub page migration.

This patch make the buffer-cache be allocated from non-movable area
not to distrub page migration.

Signed-off-by: Gioh Kim <gioh.kim@....com>
---
 fs/jbd/journal.c  |    2 +-
 fs/jbd2/journal.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index 06fe11e..aab8549 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -886,7 +886,7 @@ journal_t * journal_init_inode (struct inode *inode)
                goto out_err;
        }

-       bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
+       bh = getblk_unmovable(journal->j_dev, blocknr, journal->j_blocksize);
        if (!bh) {
                printk(KERN_ERR
                       "%s: Cannot get buffer for journal superblock\n",
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 67b8e30..65bd3b1 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1237,7 +1237,7 @@ journal_t * jbd2_journal_init_inode (struct inode *inode)
                goto out_err;
        }

-       bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
+       bh = getblk_unmovable(journal->j_dev, blocknr, journal->j_blocksize);
        if (!bh) {
                printk(KERN_ERR
                       "%s: Cannot get buffer for journal superblock\n",
--
1.7.9.5

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