linux-kernel - [PATCH v3 4/4] fs/afs/flock: Remove deprecated create_singlethread

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Message-ID: <bfe7c3746c3d6011b6247ad74587a189c0c69ba9.1473002371.git.bhaktipriya96@gmail.com>
Date:   Sun, 4 Sep 2016 20:54:58 +0530
From:   Bhaktipriya Shridhar <bhaktipriya96@...il.com>
To:     David Howells <dhowells@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-afs@...ts.infradead.org,
        Tejun Heo <tj@...nel.org>
Subject: [PATCH v3 4/4] fs/afs/flock: Remove deprecated
 create_singlethread_workqueue

The workqueue "afs_lock_manager" queues work item &vnode->lock_work,
per vnode. Since there can be multiple vnodes and since their work items
can be executed concurrently, alloc_workqueue has been used to replace
the deprecated create_singlethread_workqueue instance.

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

Since there are fixed number of work items, explicit concurrency
limit is unnecessary here.

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@...il.com>
---
 Changes in v3:
	-Updated patch description

 fs/afs/flock.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/afs/flock.c b/fs/afs/flock.c
index d91a9c9..3191dff 100644
--- a/fs/afs/flock.c
+++ b/fs/afs/flock.c
@@ -36,8 +36,8 @@ static int afs_init_lock_manager(void)
 	if (!afs_lock_manager) {
 		mutex_lock(&afs_lock_manager_mutex);
 		if (!afs_lock_manager) {
-			afs_lock_manager =
-				create_singlethread_workqueue("kafs_lockd");
+			afs_lock_manager = alloc_workqueue("kafs_lockd",
+							   WQ_MEM_RECLAIM, 0);
 			if (!afs_lock_manager)
 				ret = -ENOMEM;
 		}
--
2.1.4