This is a note to let you know that I've just added the patch titled
rbd: rbd workqueues need 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:
rbd-rbd-workqueues-need-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 792c3a914910bd34302c5345578f85cfcb5e2c01 Mon Sep 17 00:00:00 2001
From: Ilya Dryomov <idryomov@xxxxxxxxxx>
Date: Fri, 10 Oct 2014 18:36:07 +0400
Subject: rbd: rbd workqueues need a resque worker
From: Ilya Dryomov <idryomov@xxxxxxxxxx>
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@xxxxxxxxxx>
Tested-by: Micha Krause <micha@xxxxxxxxxx>
Reviewed-by: Sage Weil <sage@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/rbd.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -5087,7 +5087,8 @@ static int rbd_dev_device_setup(struct r
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;
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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