From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1756378AbcH3UvH (ORCPT <rfc822;w@1wt.eu>);
        Tue, 30 Aug 2016 16:51:07 -0400
Received: from mail-pa0-f68.google.com ([209.85.220.68]:36136 "EHLO
        mail-pa0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1755926AbcH3UvD (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Tue, 30 Aug 2016 16:51:03 -0400
Date: Wed, 31 Aug 2016 02:20:59 +0530
From: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
To: Mark Fasheh <mfasheh@suse.com>, Joel Becker <jlbec@evilplan.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Joseph Qi <joseph.qi@huawei.com>, xuejiufei <xuejiufei@huawei.com>,
        "Norton.Zhu" <norton.zhu@huawei.com>, Jun Piao <piaojun@huawei.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>, Michal Hocko <mhocko@suse.com>,
        Vladimir Davydov <vdavydov@virtuozzo.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: ocfs2-devel@oss.oracle.com, linux-kernel@vger.kernel.org,
        Tejun Heo <tj@kernel.org>
Subject: [PATCH v2 3/4] fs/ocfs2/super: Remove deprecated
 create_singlethread_workqueue
Message-ID: <66279de510a7f4cfc6e386d99b7e04b3f65fb11b.1472590094.git.bhaktipriya96@gmail.com>
References: <cover.1472590094.git.bhaktipriya96@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <cover.1472590094.git.bhaktipriya96@gmail.com>
User-Agent: Mutt/1.5.23 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

The workqueue "ocfs2_wq" queues multiple work items viz
&osb->la_enable_wq, &journal->j_recovery_work, &os->os_orphan_scan_work,
&osb->osb_truncate_log_wq which require strict execution ordering.
Hence, an ordered dedicated workqueue has been used.

WQ_MEM_RECLAIM has been set to ensure forward progress under memory
pressure because the workqueue is being used on a memory reclaim path.

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
---
 Changes in v2:
	-No change.

 fs/ocfs2/super.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index d7cae33..af5285d 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -2330,7 +2330,7 @@ static int ocfs2_initialize_super(struct super_block *sb,
 	}
 	cleancache_init_shared_fs(sb);

-	osb->ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
+	osb->ocfs2_wq = alloc_ordered_workqueue("ocfs2_wq", WQ_MEM_RECLAIM);
 	if (!osb->ocfs2_wq) {
 		status = -ENOMEM;
 		mlog_errno(status);
--
2.1.4