SUNRPC: Adjust rpciod workqueue parameters

Increase the concurrency level for rpciod threads to allow for allocations
etc that happen in the RPCSEC_GSS layer. Also note that the NFSv4 byte range
locks may now need to allocate memory from inside rpciod.

Add the WQ_HIGHPRI flag to improve latency guarantees while we're at it.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index d20f2329eea3f4e05f5ff679368ed82a281ff991..4f65ec28d2b49c39553d753272e53cf7c4aeb879 100644 (file)
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -1069,7 +1069,8 @@ static int rpciod_start(void)
         * Create the rpciod thread and wait for it to start.
         */
        dprintk("RPC:       creating workqueue rpciod\n");
-       wq = alloc_workqueue("rpciod", WQ_MEM_RECLAIM, 1);
+       /* Note: highpri because network receive is latency sensitive */
+       wq = alloc_workqueue("rpciod", WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
        rpciod_workqueue = wq;
        return rpciod_workqueue != NULL;
 }