[RFC PATCH 5/6] fuse: dax: Move long delayed work on system_dfl_long_wq

[Marco Crivellari <marco.crivellari@suse.com>]

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: Miklos Szeredi <miklos@szeredi.hu>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Marco Crivellari <marco.crivellari@suse.com>
---
 fs/fuse/dax.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c
index f6cf00a8938c..8b53625ac7ab 100644
--- a/fs/fuse/dax.c
+++ b/fs/fuse/dax.c
@@ -113,7 +113,7 @@ __kick_dmap_free_worker(struct fuse_conn_dax *fcd, unsigned long delay_ms)
 	free_threshold = max_t(unsigned long, fcd->nr_ranges * FUSE_DAX_RECLAIM_THRESHOLD / 100,
 			     1);
 	if (fcd->nr_free_ranges < free_threshold)
-		queue_delayed_work(system_long_wq, &fcd->free_work,
+		queue_delayed_work(system_dfl_long_wq, &fcd->free_work,
 				   msecs_to_jiffies(delay_ms));
 }
 
-- 
2.53.0