From 7689b7221333bf82ceb09ab19642b848a5f02a6d Mon Sep 17 00:00:00 2001 From: Marco Crivellari Date: Mon, 6 Jul 2026 12:54:33 +0200 Subject: [PATCH] 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);