This is a note to let you know that I've just added the patch titled
libceph: ceph-msgr workqueue needs a resque worker
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
libceph-ceph-msgr-workqueue-needs-a-resque-worker.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f9865f06f7f18c6661c88d0511f05c48612319cc Mon Sep 17 00:00:00 2001
From: Ilya Dryomov <idryomov@xxxxxxxxxx>
Date: Fri, 10 Oct 2014 16:39:05 +0400
Subject: libceph: ceph-msgr workqueue needs a resque worker
From: Ilya Dryomov <idryomov@xxxxxxxxxx>
commit f9865f06f7f18c6661c88d0511f05c48612319cc upstream.
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.
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxxx>
Tested-by: Micha Krause <micha@xxxxxxxxxx>
Reviewed-by: Sage Weil <sage@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ceph/messenger.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- 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;
Patches currently in stable-queue which might be from idryomov@xxxxxxxxxx are
queue-3.17/rbd-rbd-workqueues-need-a-resque-worker.patch
queue-3.17/libceph-ceph-msgr-workqueue-needs-a-resque-worker.patch
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