From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Fri, 23 Jan 2015 18:19:17 +0000 (-0500)
Subject: SUNRPC: Adjust rpciod workqueue parameters
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=127b21b89f9d8ba0dc23e47b8c35d8a0bac9d6fc;p=linux-beck.git

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 d20f2329eea3..4f65ec28d2b4 100644
--- 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;
 }