From cb0ceb9fa03fa4a4f104762f71f151b70f5e9a01 Mon Sep 17 00:00:00 2001 From: Marco Crivellari Date: Mon, 6 Jul 2026 12:54:34 +0200 Subject: [PATCH] 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__); }