nfsd: use system_unbound_wq for nfsd_file_gc_worker()

After many rounds of changes in filecache.c, the fix by commit
ce7df055(NFSD: Make the file_delayed_close workqueue UNBOUND)
is gone, now we are getting syslog messages like these:

[ 1618.186688] workqueue: nfsd_file_gc_worker [nfsd] hogged CPU for >13333us 4 times, consider switching to WQ_UNBOUND
[ 1638.661616] workqueue: nfsd_file_gc_worker [nfsd] hogged CPU for >13333us 8 times, consider switching to WQ_UNBOUND
[ 1665.284542] workqueue: nfsd_file_gc_worker [nfsd] hogged CPU for >13333us 16 times, consider switching to WQ_UNBOUND
[ 1759.491342] workqueue: nfsd_file_gc_worker [nfsd] hogged CPU for >13333us 32 times, consider switching to WQ_UNBOUND
[ 3013.012308] workqueue: nfsd_file_gc_worker [nfsd] hogged CPU for >13333us 64 times, consider switching to WQ_UNBOUND
[ 3154.172827] workqueue: nfsd_file_gc_worker [nfsd] hogged CPU for >13333us 128 times, consider switching to WQ_UNBOUND
[ 3422.461924] workqueue: nfsd_file_gc_worker [nfsd] hogged CPU for >13333us 256 times, consider switching to WQ_UNBOUND
[ 3963.152054] workqueue: nfsd_file_gc_worker [nfsd] hogged CPU for >13333us 512 times, consider switching to WQ_UNBOUND

Consider use system_unbound_wq instead of system_wq for
nfsd_file_gc_worker().

Signed-off-by: Youzhong Yang <youzhong@gmail.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 93e2ffa5eae6dab770584bafe9af609ae2f76800..9e9d246f993c2177f52bec570804d6ed2e50b18b 100644 (file)
--- 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_wq, &nfsd_filecache_laundrette,
+               queue_delayed_work(system_unbound_wq, &nfsd_filecache_laundrette,
                                   NFSD_LAUNDRETTE_DELAY);
 }