From 7689b7221333bf82ceb09ab19642b848a5f02a6d Mon Sep 17 00:00:00 2001 From: Marco Crivellari Date: Mon, 6 Jul 2026 12:54:33 +0200 Subject: [PATCH 1/5] ufs: Move long delayed work on system_dfl_long_wq MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Currently the code enqueue work items using {queue|mod}_delayed_work(), using system_long_wq. This workqueue should be used when long works are expected and it is a per-cpu workqueue. The function(s) end up calling __queue_delayed_work(), which set a global timer that could fire anywhere, enqueuing the work where the timer fired. Unbound works could benefit from scheduler task placement, to optimize performance and power consumption. Long work shouldn't stick to a single CPU. Recently, a new unbound workqueue specific for long running work has been added:     c116737e972e ("workqueue: Add system_dfl_long_wq for long unbound works") Since the workqueue work doesn't rely on per-cpu variables, there is no obvious reason that justify the use of a per-cpu workqueue. So change system_long_wq with system_dfl_long_wq so that the work may benefit from scheduler task placement. Cc: Al Viro Cc: Kees Cook Cc: Eric Sandeen Signed-off-by: Marco Crivellari Link: https://patch.msgid.link/20260706105443.173697-2-marco.crivellari@suse.com Signed-off-by: Christian Brauner (Amutable) --- fs/ufs/super.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/ufs/super.c b/fs/ufs/super.c index c4831a8b9b3f..6dcf6d048cce 100644 --- a/fs/ufs/super.c +++ b/fs/ufs/super.c @@ -672,7 +672,7 @@ void ufs_mark_sb_dirty(struct super_block *sb) spin_lock(&sbi->work_lock); if (!sbi->work_queued) { delay = msecs_to_jiffies(dirty_writeback_interval * 10); - queue_delayed_work(system_long_wq, &sbi->sync_work, delay); + queue_delayed_work(system_dfl_long_wq, &sbi->sync_work, delay); sbi->work_queued = 1; } spin_unlock(&sbi->work_lock); From cb0ceb9fa03fa4a4f104762f71f151b70f5e9a01 Mon Sep 17 00:00:00 2001 From: Marco Crivellari Date: Mon, 6 Jul 2026 12:54:34 +0200 Subject: [PATCH 2/5] fs/jffs2: Move long delayed work on system_dfl_long_wq MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Currently the code enqueue work items using {queue|mod}_delayed_work(), using system_long_wq. This workqueue should be used when long works are expected and it is a per-cpu workqueue. The function(s) end up calling __queue_delayed_work(), which set a global timer that could fire anywhere, enqueuing the work where the timer fired. Unbound works could benefit from scheduler task placement, to optimize performance and power consumption. Long work shouldn't stick to a single CPU. Recently, a new unbound workqueue specific for long running work has been added:     c116737e972e ("workqueue: Add system_dfl_long_wq for long unbound works") Since the workqueue work doesn't rely on per-cpu variables, there is no obvious reason that justify the use of a per-cpu workqueue. So change system_long_wq with system_dfl_long_wq so that the work may benefit from scheduler task placement. Cc: David Woodhouse Cc: Richard Weinberger Cc: linux-mtd@lists.infradead.org Signed-off-by: Marco Crivellari Link: https://patch.msgid.link/20260706105443.173697-3-marco.crivellari@suse.com Signed-off-by: Christian Brauner (Amutable) --- fs/jffs2/wbuf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c index 8ff7a0b6add2..3b7803c75d58 100644 --- a/fs/jffs2/wbuf.c +++ b/fs/jffs2/wbuf.c @@ -1177,7 +1177,7 @@ void jffs2_dirty_trigger(struct jffs2_sb_info *c) return; delay = msecs_to_jiffies(dirty_writeback_interval * 10); - if (queue_delayed_work(system_long_wq, &c->wbuf_dwork, delay)) + if (queue_delayed_work(system_dfl_long_wq, &c->wbuf_dwork, delay)) jffs2_dbg(1, "%s()\n", __func__); } From f159da4398352302948c4f328515dca0b6f336b7 Mon Sep 17 00:00:00 2001 From: Marco Crivellari Date: Mon, 6 Jul 2026 12:54:35 +0200 Subject: [PATCH 3/5] hfsplus: Move long delayed work on system_dfl_long_wq MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Currently the code enqueue work items using {queue|mod}_delayed_work(), using system_long_wq. This workqueue should be used when long works are expected and it is a per-cpu workqueue. The function(s) end up calling __queue_delayed_work(), which set a global timer that could fire anywhere, enqueuing the work where the timer fired. Unbound works could benefit from scheduler task placement, to optimize performance and power consumption. Long work shouldn't stick to a single CPU. Recently, a new unbound workqueue specific for long running work has been added:     c116737e972e ("workqueue: Add system_dfl_long_wq for long unbound works") Since the workqueue work doesn't rely on per-cpu variables, there is no obvious reason that justify the use of a per-cpu workqueue. So change system_long_wq with system_dfl_long_wq so that the work may benefit from scheduler task placement. Cc: Viacheslav Dubeyko Cc: John Paul Adrian Glaubitz Cc: Yangtao Li Cc: linux-fsdevel@vger.kernel.org Signed-off-by: Marco Crivellari Link: https://patch.msgid.link/20260706105443.173697-4-marco.crivellari@suse.com Reviewed-by: Viacheslav Dubeyko Signed-off-by: Christian Brauner (Amutable) --- fs/hfsplus/super.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c index 5777e31de45a..ff7d6b3336a6 100644 --- a/fs/hfsplus/super.c +++ b/fs/hfsplus/super.c @@ -312,7 +312,7 @@ void hfsplus_mark_mdb_dirty(struct super_block *sb) spin_lock(&sbi->work_lock); if (!sbi->work_queued) { delay = msecs_to_jiffies(dirty_writeback_interval * 10); - queue_delayed_work(system_long_wq, &sbi->sync_work, delay); + queue_delayed_work(system_dfl_long_wq, &sbi->sync_work, delay); sbi->work_queued = 1; } spin_unlock(&sbi->work_lock); From c7443c7bfa55b99c80097041f8fb6a4040f69630 Mon Sep 17 00:00:00 2001 From: Marco Crivellari Date: Mon, 6 Jul 2026 12:54:36 +0200 Subject: [PATCH 4/5] hfs: Move long delayed work on system_dfl_long_wq MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Currently the code enqueue work items using {queue|mod}_delayed_work(), using system_long_wq. This workqueue should be used when long works are expected and it is a per-cpu workqueue. The function(s) end up calling __queue_delayed_work(), which set a global timer that could fire anywhere, enqueuing the work where the timer fired. Unbound works could benefit from scheduler task placement, to optimize performance and power consumption. Long work shouldn't stick to a single CPU. Recently, a new unbound workqueue specific for long running work has been added:     c116737e972e ("workqueue: Add system_dfl_long_wq for long unbound works") Since the workqueue work doesn't rely on per-cpu variables, there is no obvious reason that justify the use of a per-cpu workqueue. So change system_long_wq with system_dfl_long_wq so that the work may benefit from scheduler task placement. Cc: Viacheslav Dubeyko Cc: John Paul Adrian Glaubitz Cc: Yangtao Li Cc: linux-fsdevel@vger.kernel.org Signed-off-by: Marco Crivellari Link: https://patch.msgid.link/20260706105443.173697-5-marco.crivellari@suse.com Reviewed-by: Viacheslav Dubeyko Signed-off-by: Christian Brauner (Amutable) --- fs/hfs/super.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/hfs/super.c b/fs/hfs/super.c index a466c401f6bb..ecdafc658928 100644 --- a/fs/hfs/super.c +++ b/fs/hfs/super.c @@ -82,7 +82,7 @@ void hfs_mark_mdb_dirty(struct super_block *sb) spin_lock(&sbi->work_lock); if (!sbi->work_queued) { delay = msecs_to_jiffies(dirty_writeback_interval * 10); - queue_delayed_work(system_long_wq, &sbi->mdb_work, delay); + queue_delayed_work(system_dfl_long_wq, &sbi->mdb_work, delay); sbi->work_queued = 1; } spin_unlock(&sbi->work_lock); From 34361f3452f75c3a5c03e597cd71a24461d275cd Mon Sep 17 00:00:00 2001 From: Marco Crivellari Date: Mon, 6 Jul 2026 12:54:37 +0200 Subject: [PATCH 5/5] affs: Move long delayed work on system_dfl_long_wq MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Currently the code enqueue work items using {queue|mod}_delayed_work(), using system_long_wq. This workqueue should be used when long works are expected and it is a per-cpu workqueue. The function(s) end up calling __queue_delayed_work(), which set a global timer that could fire anywhere, enqueuing the work where the timer fired. Unbound works could benefit from scheduler task placement, to optimize performance and power consumption. Long work shouldn't stick to a single CPU. Recently, a new unbound workqueue specific for long running work has been added:     c116737e972e ("workqueue: Add system_dfl_long_wq for long unbound works") Since the workqueue work doesn't rely on per-cpu variables, there is no obvious reason that justify the use of a per-cpu workqueue. So change system_long_wq with system_dfl_long_wq so that the work may benefit from scheduler task placement. Cc: David Sterba Cc: linux-fsdevel@vger.kernel.org Signed-off-by: Marco Crivellari Link: https://patch.msgid.link/20260706105443.173697-6-marco.crivellari@suse.com Acked-by: David Sterba Signed-off-by: Christian Brauner (Amutable) --- fs/affs/super.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/affs/super.c b/fs/affs/super.c index b232251aa7bb..4f331f784db2 100644 --- a/fs/affs/super.c +++ b/fs/affs/super.c @@ -88,7 +88,7 @@ void affs_mark_sb_dirty(struct super_block *sb) spin_lock(&sbi->work_lock); if (!sbi->work_queued) { delay = msecs_to_jiffies(dirty_writeback_interval * 10); - queue_delayed_work(system_long_wq, &sbi->sb_work, delay); + queue_delayed_work(system_dfl_long_wq, &sbi->sb_work, delay); sbi->work_queued = 1; } spin_unlock(&sbi->work_lock);