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rbd: rbd workqueues need a resque worker

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

Cc: stable@vger.kernel.org # 3.17, needs backporting for 3.16
Signed-off-by: Ilya Dryomov <idryomov@redhat.com>
Tested-by: Micha Krause <micha@krausam.de>
Reviewed-by: Sage Weil <sage@redhat.com>
This commit is contained in:
Ilya Dryomov 2014-10-10 18:36:07 +04:00 committed by Sage Weil
parent f9865f06f7
commit 792c3a9149
1 changed files with 2 additions and 1 deletions
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3
drivers/block/rbd.c
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@ -5242,7 +5242,8 @@ static int rbd_dev_device_setup(struct rbd_device *rbd_dev)
set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE);
set_disk_ro(rbd_dev->disk, rbd_dev->mapping.read_only); 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) { if (!rbd_dev->rq_wq) {
ret = -ENOMEM; ret = -ENOMEM;
goto err_out_mapping; goto err_out_mapping;