[PATCH 0/9] Remove deprecated create_singlethread_workqueue

[PATCH 0/9] Remove deprecated create_singlethread_workqueue

[Bhaktipriya Shridhar]

This patch set removes deprecated create_singlethread_workqueue
usages in fs/.

Bhaktipriya Shridhar (9):
  fs/afs/vlocation: Remove deprecated create_singlethread_workqueue
  fs/afs/rxrpc: Remove deprecated create_singlethread_workqueue
  fs/afs/callback: Remove deprecated create_singlethread_workqueue
  fs/afs/flock: Remove deprecated create_singlethread_workqueue
  fs/ocfs2/dlmfs: Remove deprecated create_singlethread_workqueue
  fs/ocfs2/cluster: Remove deprecated create_singlethread_workqueue
  fs/ocfs2/super: Remove deprecated create_singlethread_workqueue
  fs/ocfs2/dlm: Remove deprecated create_singlethread_workqueue
  fs/nfsd/nfs4callback: Remove deprecated create_singlethread_workqueue

 fs/afs/callback.c        | 4 ++--
 fs/afs/flock.c           | 4 ++--
 fs/afs/rxrpc.c           | 2 +-
 fs/afs/vlocation.c       | 4 ++--
 fs/nfsd/nfs4callback.c   | 2 +-
 fs/ocfs2/cluster/tcp.c   | 2 +-
 fs/ocfs2/dlm/dlmdomain.c | 2 +-
 fs/ocfs2/dlmfs/dlmfs.c   | 2 +-
 fs/ocfs2/super.c         | 2 +-
 9 files changed, 12 insertions(+), 12 deletions(-)

--
2.1.4

[PATCH 1/9] fs/afs/vlocation: Remove deprecated create_singlethread_workqueue

[Bhaktipriya Shridhar]

The workqueue "afs_vlocation_update_worker" queues a single work item
&afs_vlocation_update and hence it doesn't require execution ordering.
Hence, alloc_workqueue has been used to replace the deprecated
create_singlethread_workqueue instance.

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

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

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
---
 fs/afs/vlocation.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/afs/vlocation.c b/fs/afs/vlocation.c
index 5297678..45a8639 100644
--- a/fs/afs/vlocation.c
+++ b/fs/afs/vlocation.c
@@ -594,8 +594,8 @@ static void afs_vlocation_reaper(struct work_struct *work)
  */
 int __init afs_vlocation_update_init(void)
 {
-	afs_vlocation_update_worker =
-		create_singlethread_workqueue("kafs_vlupdated");
+	afs_vlocation_update_worker = alloc_workqueue("kafs_vlupdated",
+						      WQ_MEM_RECLAIM, 0);
 	return afs_vlocation_update_worker ? 0 : -ENOMEM;
 }

--
2.1.4

[PATCH 2/9] fs/afs/rxrpc: Remove deprecated create_singlethread_workqueue

[Bhaktipriya Shridhar]

The workqueue "afs_async_calls" queues a single work item viz
&call->async_work and hence it doesn't require execution ordering.
Hence, 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@gmail.com>
---
 fs/afs/rxrpc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index 63cd9f9..4f9e9b3 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -85,7 +85,7 @@ int afs_open_socket(void)

 	skb_queue_head_init(&afs_incoming_calls);

-	afs_async_calls = create_singlethread_workqueue("kafsd");
+	afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0);
 	if (!afs_async_calls) {
 		_leave(" = -ENOMEM [wq]");
 		return -ENOMEM;
--
2.1.4

[PATCH 3/9] fs/afs/callback: Remove deprecated create_singlethread_workqueue

[Bhaktipriya Shridhar]

The workqueue "afs_callback_update_worker" queues multiple work items
viz  &vnode->cb_broken_work, &server->cb_break_work which require strict
execution ordering. Hence, an ordered dedicated workqueue has been used.

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

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
---
 fs/afs/callback.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/afs/callback.c b/fs/afs/callback.c
index 7ef637d..1e9d2f8 100644
--- a/fs/afs/callback.c
+++ b/fs/afs/callback.c
@@ -461,8 +461,8 @@ static void afs_callback_updater(struct work_struct *work)
  */
 int __init afs_callback_update_init(void)
 {
-	afs_callback_update_worker =
-		create_singlethread_workqueue("kafs_callbackd");
+	afs_callback_update_worker = alloc_ordered_workqueue("kafs_callbackd",
+							     WQ_MEM_RECLAIM);
 	return afs_callback_update_worker ? 0 : -ENOMEM;
 }

--
2.1.4

[PATCH 4/9] fs/afs/flock: Remove deprecated create_singlethread_workqueue

[Bhaktipriya Shridhar]

The workqueue "afs_lock_manager" queues a single work item
&vnode->lock_work, and hence it doesn't require execution ordering.
Hence, 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@gmail.com>
---
 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

[PATCH 5/9] fs/ocfs2/dlmfs: Remove deprecated create_singlethread_workqueue

[Bhaktipriya Shridhar]

The workqueue "user_dlm_worker" queues a single work item
&lockres->l_work per user_lock_res instance and hence it doesn't require
execution ordering. Hence, 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.

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

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
---
 fs/ocfs2/dlmfs/dlmfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ocfs2/dlmfs/dlmfs.c b/fs/ocfs2/dlmfs/dlmfs.c
index 47b3b2d..afe6e10 100644
--- a/fs/ocfs2/dlmfs/dlmfs.c
+++ b/fs/ocfs2/dlmfs/dlmfs.c
@@ -646,7 +646,7 @@ static int __init init_dlmfs_fs(void)
 	}
 	cleanup_inode = 1;

-	user_dlm_worker = create_singlethread_workqueue("user_dlm");
+	user_dlm_worker = alloc_workqueue("user_dlm", WQ_MEM_RECLAIM, 0);
 	if (!user_dlm_worker) {
 		status = -ENOMEM;
 		goto bail;
--
2.1.4

[PATCH 6/9] fs/ocfs2/cluster: Remove deprecated create_singlethread_workqueue

[Bhaktipriya Shridhar]

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@gmail.com>
---
 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

[PATCH 7/9] fs/ocfs2/super: Remove deprecated create_singlethread_workqueue

[Bhaktipriya Shridhar]

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>
---
 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

[PATCH 8/9] fs/ocfs2/dlm: Remove deprecated create_singlethread_workqueue

[Bhaktipriya Shridhar]

The workqueue "dlm_worker" queues a single work item &dlm->dispatched_work
and thus it doesn't require execution ordering. Hence, 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.

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

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
---
 fs/ocfs2/dlm/dlmdomain.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
index 12e064b..dc30f38 100644
--- a/fs/ocfs2/dlm/dlmdomain.c
+++ b/fs/ocfs2/dlm/dlmdomain.c
@@ -1906,7 +1906,7 @@ static int dlm_join_domain(struct dlm_ctxt *dlm)
 	}

 	snprintf(wq_name, O2NM_MAX_NAME_LEN, "dlm_wq-%s", dlm->name);
-	dlm->dlm_worker = create_singlethread_workqueue(wq_name);
+	dlm->dlm_worker = alloc_workqueue(wq_name, WQ_MEM_RECLAIM, 0);
 	if (!dlm->dlm_worker) {
 		status = -ENOMEM;
 		mlog_errno(status);
--
2.1.4

[PATCH 9/9] fs/nfsd/nfs4callback: Remove deprecated create_singlethread_workqueue

[Bhaktipriya Shridhar]

The workqueue "callback_wq" queues a single work item &cb->cb_work per
nfsd4_callback instance and thus, it doesn't require execution ordering.
Hence, alloc_workqueue has been used to replace the
deprecated create_singlethread_workqueue instance.

The WQ_MEM_RECLAIM flag has not been set since this is an in-kernel nfs
server and isn't involved in memory reclaim operations on the local
host.

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

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
---
 fs/nfsd/nfs4callback.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 7389cb1..a6611c6 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1021,7 +1021,7 @@ static const struct rpc_call_ops nfsd4_cb_ops = {

 int nfsd4_create_callback_queue(void)
 {
-	callback_wq = create_singlethread_workqueue("nfsd4_callbacks");
+	callback_wq = alloc_workqueue("nfsd4_callbacks", 0, 0);
 	if (!callback_wq)
 		return -ENOMEM;
 	return 0;
--
2.1.4

Re: [PATCH 0/9] Remove deprecated create_singlethread_workqueue

[David Howells]

Bhaktipriya Shridhar <bhaktipriya96@gmail.com> wrote:

> This patch set removes deprecated create_singlethread_workqueue
> usages in fs/.
> 
> Bhaktipriya Shridhar (9):
>   fs/afs/vlocation: Remove deprecated create_singlethread_workqueue
>   fs/afs/rxrpc: Remove deprecated create_singlethread_workqueue
>   fs/afs/callback: Remove deprecated create_singlethread_workqueue
>   fs/afs/flock: Remove deprecated create_singlethread_workqueue

I'm removing the workqueue in fs/afs/rxrpc.c in one of my patches.  Can I take
your other three AFS patches myself and leave someone else to handle the
non-AFS patches?

David

[Ocfs2-devel] [PATCH 0/9] Remove deprecated create_singlethread_workqueue

[David Howells]

Bhaktipriya Shridhar <bhaktipriya96@gmail.com> wrote:

> This patch set removes deprecated create_singlethread_workqueue
> usages in fs/.
> 
> Bhaktipriya Shridhar (9):
>   fs/afs/vlocation: Remove deprecated create_singlethread_workqueue
>   fs/afs/rxrpc: Remove deprecated create_singlethread_workqueue
>   fs/afs/callback: Remove deprecated create_singlethread_workqueue
>   fs/afs/flock: Remove deprecated create_singlethread_workqueue

I'm removing the workqueue in fs/afs/rxrpc.c in one of my patches.  Can I take
your other three AFS patches myself and leave someone else to handle the
non-AFS patches?

David

Re: [PATCH 0/9] Remove deprecated create_singlethread_workqueue

[Bhaktipriya Shridhar]

Hello David,

I'll mail another patchset with AFS, ocfs2 and nfsd patches separated out.


Thanks,
Bhaktipriya


On Wed, Aug 31, 2016 at 1:06 AM, David Howells <dhowells@redhat.com> wrote:
> Bhaktipriya Shridhar <bhaktipriya96@gmail.com> wrote:
>
>> This patch set removes deprecated create_singlethread_workqueue
>> usages in fs/.
>>
>> Bhaktipriya Shridhar (9):
>>   fs/afs/vlocation: Remove deprecated create_singlethread_workqueue
>>   fs/afs/rxrpc: Remove deprecated create_singlethread_workqueue
>>   fs/afs/callback: Remove deprecated create_singlethread_workqueue
>>   fs/afs/flock: Remove deprecated create_singlethread_workqueue
>
> I'm removing the workqueue in fs/afs/rxrpc.c in one of my patches.  Can I take
> your other three AFS patches myself and leave someone else to handle the
> non-AFS patches?
>
> David

Re: [PATCH 4/9] fs/afs/flock: Remove deprecated create_singlethread_workqueue

[Tejun Heo]

On Tue, Aug 30, 2016 at 11:15:28PM +0530, Bhaktipriya Shridhar wrote:
> The workqueue "afs_lock_manager" queues a single work item
> &vnode->lock_work, and hence it doesn't require execution ordering.
> Hence, 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@gmail.com>

For all afs patches,

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

-- 
tejun

Re: [PATCH 8/9] fs/ocfs2/dlm: Remove deprecated create_singlethread_workqueue

[Tejun Heo]

On Tue, Aug 30, 2016 at 11:16:54PM +0530, Bhaktipriya Shridhar wrote:
> The workqueue "dlm_worker" queues a single work item &dlm->dispatched_work
> and thus it doesn't require execution ordering. Hence, 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.
> 
> Since there are fixed number of work items, explicit concurrency
> limit is unnecessary here.
> 
> Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>

For all ocfs2 patches,

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

-- 
tejun

Re: [PATCH 9/9] fs/nfsd/nfs4callback: Remove deprecated create_singlethread_workqueue

[Tejun Heo]

On Tue, Aug 30, 2016 at 11:17:21PM +0530, Bhaktipriya Shridhar wrote:
> The workqueue "callback_wq" queues a single work item &cb->cb_work per
> nfsd4_callback instance and thus, it doesn't require execution ordering.
> Hence, alloc_workqueue has been used to replace the
> deprecated create_singlethread_workqueue instance.
> 
> The WQ_MEM_RECLAIM flag has not been set since this is an in-kernel nfs
> server and isn't involved in memory reclaim operations on the local
> host.
> 
> Since there are fixed number of work items, explicit concurrency
> limit is unnecessary here.
> 
> Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

-- 
tejun