From: Chuck Lever <chuck.lever@xxxxxxxxxx>
Youzhong Yang <youzhong@xxxxxxxxx> noticed the workqueue subsystem
complaining about how long the filecache laundrette was running.
This resulted in switching from using the system_wq for the
laundrette to system_unbound_wq (see commit 4b84551a35e3 ("nfsd: use
system_unbound_wq for nfsd_file_gc_worker()").
However, I've seen the laundrette running for multiple milliseconds
on some workloads, delaying other work. For the purpose of
scheduling fairness, perhaps a better choice would be to process
filecache disposal queues on the system_long_wq instead.
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/nfsd/filecache.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index a1cdba42c4fa..91a535c2dede 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -112,7 +112,7 @@ static void
nfsd_file_schedule_laundrette(void)
{
if (test_bit(NFSD_FILE_CACHE_UP, &nfsd_file_flags))
- queue_delayed_work(system_unbound_wq, &nfsd_filecache_laundrette,
+ queue_delayed_work(system_long_wq, &nfsd_filecache_laundrette,
NFSD_LAUNDRETTE_DELAY);
}
--
2.47.0
