From 34361f3452f75c3a5c03e597cd71a24461d275cd Mon Sep 17 00:00:00 2001 From: Marco Crivellari Date: Mon, 6 Jul 2026 12:54:37 +0200 Subject: [PATCH] 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);