rbd: rbd workqueues need a resque worker

commit 792c3a914910bd34302c5345578f85cfcb5e2c01 upstream.

Need to use WQ_MEM_RECLAIM for our workqueues to prevent I/O lockups
under memory pressure - we sit on the memory reclaim path.

Signed-off-by: Ilya Dryomov <idryomov@redhat.com>
Tested-by: Micha Krause <micha@krausam.de>
Reviewed-by: Sage Weil <sage@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 4b97baf8afa317347ca7ff531f2d8828394084a2..03f536867fd811b5888690fb2f4fdd8abaf52784 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -5087,7 +5087,8 @@ static int rbd_dev_device_setup(struct rbd_device *rbd_dev)
        set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE);
        set_disk_ro(rbd_dev->disk, rbd_dev->mapping.read_only);
 
-       rbd_dev->rq_wq = alloc_workqueue("%s", 0, 0, rbd_dev->disk->disk_name);
+       rbd_dev->rq_wq = alloc_workqueue("%s", WQ_MEM_RECLAIM, 0,
+                                        rbd_dev->disk->disk_name);
        if (!rbd_dev->rq_wq) {
                ret = -ENOMEM;
                goto err_out_mapping;