The patch below does not apply to the 3.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From f9865f06f7f18c6661c88d0511f05c48612319cc Mon Sep 17 00:00:00 2001
From: Ilya Dryomov <idryomov@xxxxxxxxxx>
Date: Fri, 10 Oct 2014 16:39:05 +0400
Subject: [PATCH] libceph: ceph-msgr workqueue needs a resque worker
Commit f363e45fd118 ("net/ceph: make ceph_msgr_wq non-reentrant")
effectively removed WQ_MEM_RECLAIM flag from ceph_msgr_wq. This is
wrong - libceph is very much a memory reclaim path, so restore it.
Cc: stable@xxxxxxxxxxxxxxx # needs backporting for < 3.12
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxxx>
Tested-by: Micha Krause <micha@xxxxxxxxxx>
Reviewed-by: Sage Weil <sage@xxxxxxxxxx>
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 9764c771cfb1..559c9f619c20 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -292,7 +292,11 @@ int ceph_msgr_init(void)
if (ceph_msgr_slab_init())
return -ENOMEM;
- ceph_msgr_wq = alloc_workqueue("ceph-msgr", 0, 0);
+ /*
+ * The number of active work items is limited by the number of
+ * connections, so leave @max_active at default.
+ */
+ ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_MEM_RECLAIM, 0);
if (ceph_msgr_wq)
return 0;
--
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