linux-kernel - [PATCH v2 2/4] fs/ocfs2/cluster: Remove deprecated create_singlethread

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Date:   Wed, 31 Aug 2016 02:20:20 +0530
From:   Bhaktipriya Shridhar <bhaktipriya96@...il.com>
To:     Mark Fasheh <mfasheh@...e.com>, Joel Becker <jlbec@...lplan.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joseph Qi <joseph.qi@...wei.com>,
        xuejiufei <xuejiufei@...wei.com>,
        "Norton.Zhu" <norton.zhu@...wei.com>,
        Jun Piao <piaojun@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Michal Hocko <mhocko@...e.com>,
        Vladimir Davydov <vdavydov@...tuozzo.com>,
        Johannes Weiner <hannes@...xchg.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     ocfs2-devel@....oracle.com, linux-kernel@...r.kernel.org,
        Tejun Heo <tj@...nel.org>
Subject: [PATCH v2 2/4] fs/ocfs2/cluster: Remove deprecated
 create_singlethread_workqueue

The workqueue "o2net_wq" queues multiple work items viz
&old_sc->sc_shutdown_work, &sc->sc_rx_work, &sc->sc_connect_work 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.

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

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

diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c
index 4238eb2..47afe9c 100644
--- a/fs/ocfs2/cluster/tcp.c
+++ b/fs/ocfs2/cluster/tcp.c
@@ -2108,7 +2108,7 @@ int o2net_start_listening(struct o2nm_node *node)
 	BUG_ON(o2net_listen_sock != NULL);

 	mlog(ML_KTHREAD, "starting o2net thread...\n");
-	o2net_wq = create_singlethread_workqueue("o2net");
+	o2net_wq = alloc_ordered_workqueue("o2net", WQ_MEM_RECLAIM);
 	if (o2net_wq == NULL) {
 		mlog(ML_ERROR, "unable to launch o2net thread\n");
 		return -ENOMEM; /* ? */
--
2.1.4